Leukemia, Myelodysplasia, Transplantation

Children reading

Pediatric acute lymphoblastic leukemia (ALL) patients treated with chemotherapy alone are at risk for attention and learning problems that persist after treatment ends, according to a study published in the Journal of Clinical Oncology.

Researchers said this study is the largest assessment to date of neurocognitive outcomes in pediatric ALL survivors treated with intensive chemotherapy alone rather than in combination with cranial radiation.

“This is an important contribution to the literature because the smaller size and design of previous studies made examining the impact of treatment difficult,” said study author Lisa Jacola, PhD, of St. Jude Children’s Research Hospital in Memphis, Tennessee.

“The findings underscore the need for neurocognitive and academic screening to be included as part of routine survivorship care for all pediatric ALL survivors.”

The study included patients enrolled in the St. Jude Total Therapy Study XV. They underwent neurocognitive assessments at the beginning of induction (n=142), end of maintenance (n=243), and 2 years after completing treatment (n=211).

The subjects completed standardized tests of overall intelligence, attention, learning, and academic performance. In addition, parents and other caregivers rated the subjects’ attention, learning, and behavior.

Two years after treatment completion, subjects performed as expected for their age (compared to national data) on measures of overall intelligence, learning, and memory. However, study subjects had significant attention deficits and a significantly greater frequency of learning problems (all P≤0.005).

The risk of such problems was greatest for survivors who were less than 5 years old when diagnosed with ALL and for those who received more intensive chemotherapy.

Specifically, the younger subjects had a greater risk of difficulties with attention, learning, working memory, and processing speed (all P≤0.05). And subjects who received higher-intensity, CNS-directed chemotherapy had a greater risk of difficulties in attention, processing speed, and academics (all P≤0.01).

Researchers also found that subjects with attention problems at the end of therapy had lower academic scores 2 years later (all P≤0.05).

“These findings provide additional evidence that neurocognitive functioning has improved in survivors of childhood ALL since cranial irradiation was replaced with intensified chemotherapy,” Dr Jacola said.

“But we also show these young people are at an elevated risk for attention problems that have real-world consequences, particularly for learning and school performance. Attention is a building block for learning, and, in this study, attention difficulties predicted academic problems later. If we know attention problems seen at the end of therapy continue and contribute to academic problems, then our goal is to intervene earlier to reduce or prevent such difficulties.”

Children reading

Pediatric acute lymphoblastic leukemia (ALL) patients treated with chemotherapy alone are at risk for attention and learning problems that persist after treatment ends, according to a study published in the Journal of Clinical Oncology.

Researchers said this study is the largest assessment to date of neurocognitive outcomes in pediatric ALL survivors treated with intensive chemotherapy alone rather than in combination with cranial radiation.

“This is an important contribution to the literature because the smaller size and design of previous studies made examining the impact of treatment difficult,” said study author Lisa Jacola, PhD, of St. Jude Children’s Research Hospital in Memphis, Tennessee.

“The findings underscore the need for neurocognitive and academic screening to be included as part of routine survivorship care for all pediatric ALL survivors.”

The study included patients enrolled in the St. Jude Total Therapy Study XV. They underwent neurocognitive assessments at the beginning of induction (n=142), end of maintenance (n=243), and 2 years after completing treatment (n=211).

The subjects completed standardized tests of overall intelligence, attention, learning, and academic performance. In addition, parents and other caregivers rated the subjects’ attention, learning, and behavior.

Two years after treatment completion, subjects performed as expected for their age (compared to national data) on measures of overall intelligence, learning, and memory. However, study subjects had significant attention deficits and a significantly greater frequency of learning problems (all P≤0.005).

The risk of such problems was greatest for survivors who were less than 5 years old when diagnosed with ALL and for those who received more intensive chemotherapy.

Specifically, the younger subjects had a greater risk of difficulties with attention, learning, working memory, and processing speed (all P≤0.05). And subjects who received higher-intensity, CNS-directed chemotherapy had a greater risk of difficulties in attention, processing speed, and academics (all P≤0.01).

Researchers also found that subjects with attention problems at the end of therapy had lower academic scores 2 years later (all P≤0.05).

“These findings provide additional evidence that neurocognitive functioning has improved in survivors of childhood ALL since cranial irradiation was replaced with intensified chemotherapy,” Dr Jacola said.

“But we also show these young people are at an elevated risk for attention problems that have real-world consequences, particularly for learning and school performance. Attention is a building block for learning, and, in this study, attention difficulties predicted academic problems later. If we know attention problems seen at the end of therapy continue and contribute to academic problems, then our goal is to intervene earlier to reduce or prevent such difficulties.”

Children reading

Pediatric acute lymphoblastic leukemia (ALL) patients treated with chemotherapy alone are at risk for attention and learning problems that persist after treatment ends, according to a study published in the Journal of Clinical Oncology.

Researchers said this study is the largest assessment to date of neurocognitive outcomes in pediatric ALL survivors treated with intensive chemotherapy alone rather than in combination with cranial radiation.

“This is an important contribution to the literature because the smaller size and design of previous studies made examining the impact of treatment difficult,” said study author Lisa Jacola, PhD, of St. Jude Children’s Research Hospital in Memphis, Tennessee.

“The findings underscore the need for neurocognitive and academic screening to be included as part of routine survivorship care for all pediatric ALL survivors.”

The study included patients enrolled in the St. Jude Total Therapy Study XV. They underwent neurocognitive assessments at the beginning of induction (n=142), end of maintenance (n=243), and 2 years after completing treatment (n=211).

The subjects completed standardized tests of overall intelligence, attention, learning, and academic performance. In addition, parents and other caregivers rated the subjects’ attention, learning, and behavior.

Two years after treatment completion, subjects performed as expected for their age (compared to national data) on measures of overall intelligence, learning, and memory. However, study subjects had significant attention deficits and a significantly greater frequency of learning problems (all P≤0.005).

The risk of such problems was greatest for survivors who were less than 5 years old when diagnosed with ALL and for those who received more intensive chemotherapy.

Specifically, the younger subjects had a greater risk of difficulties with attention, learning, working memory, and processing speed (all P≤0.05). And subjects who received higher-intensity, CNS-directed chemotherapy had a greater risk of difficulties in attention, processing speed, and academics (all P≤0.01).

Researchers also found that subjects with attention problems at the end of therapy had lower academic scores 2 years later (all P≤0.05).

“These findings provide additional evidence that neurocognitive functioning has improved in survivors of childhood ALL since cranial irradiation was replaced with intensified chemotherapy,” Dr Jacola said.

“But we also show these young people are at an elevated risk for attention problems that have real-world consequences, particularly for learning and school performance. Attention is a building block for learning, and, in this study, attention difficulties predicted academic problems later. If we know attention problems seen at the end of therapy continue and contribute to academic problems, then our goal is to intervene earlier to reduce or prevent such difficulties.”

Researchers from University Hospital Tübingen, Germany, say that although the data for treating acute leukemia with dronabinol (THC), a cannabinoid derivative, are “controversial,” it has been shown to have antitumor potential for several cancers. When the researchers tested THC in several leukemia cell lines and native leukemia blasts cultured ex vivo, they found “meaningful” antiproliferative and proapoptotic effects.

Related: Lawmakers Urge VA to Reform Medical Marijuana Rules

From the data, they also found cannabinoid receptor agonists may be useful as low-toxic agents, especially for patients who are “heavily pretreated,” elderly, or have refractory disease. Evidence was cited that THC retained antileukemic activity in a sample from a patient with otherwise chemotherapy- and steroid-refractory acute lymphocytic leukemia (ALL).

Related: Veterans’ Use of Designer Cathinones and Cannabinoids

Due to the excellent safety profile of THC, the researchers say, effective doses are achievable in vivo, although tolerable doses may vary widely. They suggest starting with a subeffective dose and increasing gradually, which will help the patient build tolerance to the well-known psychoactive effects, which have been a drawback to widespread use of THC for patients with cancer.

They add that, due to sparse densities of cannabinoid receptors in lower brain stem areas, severe intoxications with THC rarely have been reported.

Related: Surgeon General Murthy Discusses Marijuana Efficacy

In addition to the direct antileukemic effects, the researchers suggest that therapeutic use of THC has many desirable adverse effects, such as general physical well-being, cachexia control, and relief of pain, anxiety and stress—which, they note, should “facilitate the decision process.”

Source:
Kampa-Schittenhelm KM, Salitzky O, Akmut F, et al. BMC Cancer. 2016;16(25)1-12.
doi: 10.1186/s12885-015-2029.

Researchers from University Hospital Tübingen, Germany, say that although the data for treating acute leukemia with dronabinol (THC), a cannabinoid derivative, are “controversial,” it has been shown to have antitumor potential for several cancers. When the researchers tested THC in several leukemia cell lines and native leukemia blasts cultured ex vivo, they found “meaningful” antiproliferative and proapoptotic effects.

Related: Lawmakers Urge VA to Reform Medical Marijuana Rules

From the data, they also found cannabinoid receptor agonists may be useful as low-toxic agents, especially for patients who are “heavily pretreated,” elderly, or have refractory disease. Evidence was cited that THC retained antileukemic activity in a sample from a patient with otherwise chemotherapy- and steroid-refractory acute lymphocytic leukemia (ALL).

Related: Veterans’ Use of Designer Cathinones and Cannabinoids

Due to the excellent safety profile of THC, the researchers say, effective doses are achievable in vivo, although tolerable doses may vary widely. They suggest starting with a subeffective dose and increasing gradually, which will help the patient build tolerance to the well-known psychoactive effects, which have been a drawback to widespread use of THC for patients with cancer.

They add that, due to sparse densities of cannabinoid receptors in lower brain stem areas, severe intoxications with THC rarely have been reported.

Related: Surgeon General Murthy Discusses Marijuana Efficacy

In addition to the direct antileukemic effects, the researchers suggest that therapeutic use of THC has many desirable adverse effects, such as general physical well-being, cachexia control, and relief of pain, anxiety and stress—which, they note, should “facilitate the decision process.”

Source:
Kampa-Schittenhelm KM, Salitzky O, Akmut F, et al. BMC Cancer. 2016;16(25)1-12.
doi: 10.1186/s12885-015-2029.

Researchers from University Hospital Tübingen, Germany, say that although the data for treating acute leukemia with dronabinol (THC), a cannabinoid derivative, are “controversial,” it has been shown to have antitumor potential for several cancers. When the researchers tested THC in several leukemia cell lines and native leukemia blasts cultured ex vivo, they found “meaningful” antiproliferative and proapoptotic effects.

Related: Lawmakers Urge VA to Reform Medical Marijuana Rules

From the data, they also found cannabinoid receptor agonists may be useful as low-toxic agents, especially for patients who are “heavily pretreated,” elderly, or have refractory disease. Evidence was cited that THC retained antileukemic activity in a sample from a patient with otherwise chemotherapy- and steroid-refractory acute lymphocytic leukemia (ALL).

Related: Veterans’ Use of Designer Cathinones and Cannabinoids

Due to the excellent safety profile of THC, the researchers say, effective doses are achievable in vivo, although tolerable doses may vary widely. They suggest starting with a subeffective dose and increasing gradually, which will help the patient build tolerance to the well-known psychoactive effects, which have been a drawback to widespread use of THC for patients with cancer.

They add that, due to sparse densities of cannabinoid receptors in lower brain stem areas, severe intoxications with THC rarely have been reported.

Related: Surgeon General Murthy Discusses Marijuana Efficacy

In addition to the direct antileukemic effects, the researchers suggest that therapeutic use of THC has many desirable adverse effects, such as general physical well-being, cachexia control, and relief of pain, anxiety and stress—which, they note, should “facilitate the decision process.”

Source:
Kampa-Schittenhelm KM, Salitzky O, Akmut F, et al. BMC Cancer. 2016;16(25)1-12.
doi: 10.1186/s12885-015-2029.

Dendritic cells in the skin

Dendritic cells may play a key role in T-cell acute lymphoblastic leukemia (T-ALL), according to research published in PNAS.

Investigators identified tumor-associated dendritic cells that appeared to promote T-ALL growth and survival at primary and metastatic tumor sites in mice.

Analyses of samples from patients with T-ALL suggested dendritic cells are positioned to support T-ALL growth in humans as well.

“It’s only more recently that people have really appreciated that tumors are complex organs in and of themselves, with all of the heterogenous cell types that can talk to each other and promote each other’s survival and proliferation,” said study author Lauren Ehrlich, PhD, of the University of Texas at Austin.

Dr Ehrlich and her colleagues first found that primary T-ALL cells required tumor stroma for survival ex vivo. When T-ALL cells were cultured alone or in wild-type thymic stroma, the cells died off. Only T-ALL cells cultured with tumor-associated stroma survived.

Subsequent experiments suggested it was tumor-associated dendritic cells that spurred T-ALL growth, both for newly developing T-ALL cells and tumors that had spread to distant organs in mouse models. Tissue samples from pediatric T-ALL patients had similar growth environments with abundant dendritic cells.

To determine the mechanism by which dendritic cells support T-ALL, the investigators performed gene expression profiling. They found upregulation of PDGFRB and IGF1R on T-ALL cells, with concomitant expression of their ligands by tumor-associated dendritic cells.

The team said PDGFRB and IGF1R were activated in T-ALL cells ex vivo. And when they cocultured T-ALL cells with tumor-associated dendritic cells, they observed sustained IGF1R activation. However, they did not see this activation when they cocultured T-ALL cells with normal thymic dendritic cells.

Finally, the investigators found that IGF1R signaling was necessary for dendritic cell-mediated T-ALL survival.

The team said this is the first evidence that endogenous tumor-associated dendritic cells supply signals driving T-ALL growth.

“We hope this study will be a catalyst to spur other research groups to further elucidate the roles of dendritic cells in supporting T-ALL,” said study author Todd Triplett, PhD, also of the University of Texas at Austin.

“[T]hat could ultimately lead to the discovery of novel therapeutic targets that are more effective and less toxic than current treatment regimens.”

Dendritic cells in the skin

Dendritic cells may play a key role in T-cell acute lymphoblastic leukemia (T-ALL), according to research published in PNAS.

Investigators identified tumor-associated dendritic cells that appeared to promote T-ALL growth and survival at primary and metastatic tumor sites in mice.

Analyses of samples from patients with T-ALL suggested dendritic cells are positioned to support T-ALL growth in humans as well.

“It’s only more recently that people have really appreciated that tumors are complex organs in and of themselves, with all of the heterogenous cell types that can talk to each other and promote each other’s survival and proliferation,” said study author Lauren Ehrlich, PhD, of the University of Texas at Austin.

Dr Ehrlich and her colleagues first found that primary T-ALL cells required tumor stroma for survival ex vivo. When T-ALL cells were cultured alone or in wild-type thymic stroma, the cells died off. Only T-ALL cells cultured with tumor-associated stroma survived.

Subsequent experiments suggested it was tumor-associated dendritic cells that spurred T-ALL growth, both for newly developing T-ALL cells and tumors that had spread to distant organs in mouse models. Tissue samples from pediatric T-ALL patients had similar growth environments with abundant dendritic cells.

To determine the mechanism by which dendritic cells support T-ALL, the investigators performed gene expression profiling. They found upregulation of PDGFRB and IGF1R on T-ALL cells, with concomitant expression of their ligands by tumor-associated dendritic cells.

The team said PDGFRB and IGF1R were activated in T-ALL cells ex vivo. And when they cocultured T-ALL cells with tumor-associated dendritic cells, they observed sustained IGF1R activation. However, they did not see this activation when they cocultured T-ALL cells with normal thymic dendritic cells.

Finally, the investigators found that IGF1R signaling was necessary for dendritic cell-mediated T-ALL survival.

The team said this is the first evidence that endogenous tumor-associated dendritic cells supply signals driving T-ALL growth.

“We hope this study will be a catalyst to spur other research groups to further elucidate the roles of dendritic cells in supporting T-ALL,” said study author Todd Triplett, PhD, also of the University of Texas at Austin.

“[T]hat could ultimately lead to the discovery of novel therapeutic targets that are more effective and less toxic than current treatment regimens.”

Dendritic cells in the skin

Dendritic cells may play a key role in T-cell acute lymphoblastic leukemia (T-ALL), according to research published in PNAS.

Investigators identified tumor-associated dendritic cells that appeared to promote T-ALL growth and survival at primary and metastatic tumor sites in mice.

Analyses of samples from patients with T-ALL suggested dendritic cells are positioned to support T-ALL growth in humans as well.

“It’s only more recently that people have really appreciated that tumors are complex organs in and of themselves, with all of the heterogenous cell types that can talk to each other and promote each other’s survival and proliferation,” said study author Lauren Ehrlich, PhD, of the University of Texas at Austin.

Dr Ehrlich and her colleagues first found that primary T-ALL cells required tumor stroma for survival ex vivo. When T-ALL cells were cultured alone or in wild-type thymic stroma, the cells died off. Only T-ALL cells cultured with tumor-associated stroma survived.

Subsequent experiments suggested it was tumor-associated dendritic cells that spurred T-ALL growth, both for newly developing T-ALL cells and tumors that had spread to distant organs in mouse models. Tissue samples from pediatric T-ALL patients had similar growth environments with abundant dendritic cells.

To determine the mechanism by which dendritic cells support T-ALL, the investigators performed gene expression profiling. They found upregulation of PDGFRB and IGF1R on T-ALL cells, with concomitant expression of their ligands by tumor-associated dendritic cells.

The team said PDGFRB and IGF1R were activated in T-ALL cells ex vivo. And when they cocultured T-ALL cells with tumor-associated dendritic cells, they observed sustained IGF1R activation. However, they did not see this activation when they cocultured T-ALL cells with normal thymic dendritic cells.

Finally, the investigators found that IGF1R signaling was necessary for dendritic cell-mediated T-ALL survival.

The team said this is the first evidence that endogenous tumor-associated dendritic cells supply signals driving T-ALL growth.

“We hope this study will be a catalyst to spur other research groups to further elucidate the roles of dendritic cells in supporting T-ALL,” said study author Todd Triplett, PhD, also of the University of Texas at Austin.

“[T]hat could ultimately lead to the discovery of novel therapeutic targets that are more effective and less toxic than current treatment regimens.”

Peripheral blood is a major stem cell source for hematopoietic stem cell transplantation in many parts of the world – even though bone marrow is preferred – likely due to costs, the need for patient hospitalization, and a lack of trained physicians and necessary equipment for performing bone marrow transplant, Dr. Ayami Yoshimi, and colleagues reported for the Worldwide Network of Blood and Marrow Transplantation.

Peripheral blood stem cells are readily available at transplant centers, as they are collected routinely for other indications, and they offer short-term cost savings due to rapid engraftment, the network reported in a research letter (JAMA. 2016;315[2]:198-200. doi:10.1001/jama.2015.13706).

In patients with nonmalignant disorders, use of peripheral blood stem cells in HSCT has a higher rate of graft-vs.-host disease and lower survival rates.

In the network’s retrospective survey, which they estimate covered 90% of transplants performed in 2009 and 2010, 114,217 HSCTs were reported by 1,482 transplant teams and 3,282 allogeneic HSCTs were performed for bone marrow failure. Use of peripheral blood stem cells in HSCT varied from 80% in countries with low and middle incomes to 50% in those with high-middle incomes to 36% in those with high incomes (P less than .001). For the 3,282 allogeneic HSCTs performed for bone marrow failure worldwide, stem cell sources included bone marrow (1,766, 54%), peripheral blood stem cells (1,336, 41%), and cord blood (180, 5%).

Use of unrelated donors was highest in Europe (515/1107; 47%); use of matched sibling donors was highest in the Eastern Mediterranean region and Africa (249/274; 91%).

Bone marrow was used most commonly in the Americas (631/843; 75%) and in Europe (632/1057; 60%), but not in the Eastern Mediterranean region and Africa (123/266; 46%) and in the Asia Pacific region (380/936; 41%; excluding Japan, 19%).

“National and international transplant organizations and authorities should foster regional accredited bone marrow harvest centers for patients with nonmalignant disorders and provide resources to establish such infrastructures. Unrelated donor registries should provide information on the necessity of bone marrow donation for patients with bone marrow failure,” wrote Dr. Yoshimi of the University of Freiburg, Germany, and colleagues.

Funding for the study was indirectly provided by the Worldwide Network of Blood and Marrow Transplantation. Dr. Yoshimi reported having no disclosures.

Peripheral blood is a major stem cell source for hematopoietic stem cell transplantation in many parts of the world – even though bone marrow is preferred – likely due to costs, the need for patient hospitalization, and a lack of trained physicians and necessary equipment for performing bone marrow transplant, Dr. Ayami Yoshimi, and colleagues reported for the Worldwide Network of Blood and Marrow Transplantation.

Peripheral blood stem cells are readily available at transplant centers, as they are collected routinely for other indications, and they offer short-term cost savings due to rapid engraftment, the network reported in a research letter (JAMA. 2016;315[2]:198-200. doi:10.1001/jama.2015.13706).

In patients with nonmalignant disorders, use of peripheral blood stem cells in HSCT has a higher rate of graft-vs.-host disease and lower survival rates.

In the network’s retrospective survey, which they estimate covered 90% of transplants performed in 2009 and 2010, 114,217 HSCTs were reported by 1,482 transplant teams and 3,282 allogeneic HSCTs were performed for bone marrow failure. Use of peripheral blood stem cells in HSCT varied from 80% in countries with low and middle incomes to 50% in those with high-middle incomes to 36% in those with high incomes (P less than .001). For the 3,282 allogeneic HSCTs performed for bone marrow failure worldwide, stem cell sources included bone marrow (1,766, 54%), peripheral blood stem cells (1,336, 41%), and cord blood (180, 5%).

Use of unrelated donors was highest in Europe (515/1107; 47%); use of matched sibling donors was highest in the Eastern Mediterranean region and Africa (249/274; 91%).

Bone marrow was used most commonly in the Americas (631/843; 75%) and in Europe (632/1057; 60%), but not in the Eastern Mediterranean region and Africa (123/266; 46%) and in the Asia Pacific region (380/936; 41%; excluding Japan, 19%).

“National and international transplant organizations and authorities should foster regional accredited bone marrow harvest centers for patients with nonmalignant disorders and provide resources to establish such infrastructures. Unrelated donor registries should provide information on the necessity of bone marrow donation for patients with bone marrow failure,” wrote Dr. Yoshimi of the University of Freiburg, Germany, and colleagues.

Funding for the study was indirectly provided by the Worldwide Network of Blood and Marrow Transplantation. Dr. Yoshimi reported having no disclosures.

Peripheral blood is a major stem cell source for hematopoietic stem cell transplantation in many parts of the world – even though bone marrow is preferred – likely due to costs, the need for patient hospitalization, and a lack of trained physicians and necessary equipment for performing bone marrow transplant, Dr. Ayami Yoshimi, and colleagues reported for the Worldwide Network of Blood and Marrow Transplantation.

Peripheral blood stem cells are readily available at transplant centers, as they are collected routinely for other indications, and they offer short-term cost savings due to rapid engraftment, the network reported in a research letter (JAMA. 2016;315[2]:198-200. doi:10.1001/jama.2015.13706).

In patients with nonmalignant disorders, use of peripheral blood stem cells in HSCT has a higher rate of graft-vs.-host disease and lower survival rates.

In the network’s retrospective survey, which they estimate covered 90% of transplants performed in 2009 and 2010, 114,217 HSCTs were reported by 1,482 transplant teams and 3,282 allogeneic HSCTs were performed for bone marrow failure. Use of peripheral blood stem cells in HSCT varied from 80% in countries with low and middle incomes to 50% in those with high-middle incomes to 36% in those with high incomes (P less than .001). For the 3,282 allogeneic HSCTs performed for bone marrow failure worldwide, stem cell sources included bone marrow (1,766, 54%), peripheral blood stem cells (1,336, 41%), and cord blood (180, 5%).

Use of unrelated donors was highest in Europe (515/1107; 47%); use of matched sibling donors was highest in the Eastern Mediterranean region and Africa (249/274; 91%).

Bone marrow was used most commonly in the Americas (631/843; 75%) and in Europe (632/1057; 60%), but not in the Eastern Mediterranean region and Africa (123/266; 46%) and in the Asia Pacific region (380/936; 41%; excluding Japan, 19%).

“National and international transplant organizations and authorities should foster regional accredited bone marrow harvest centers for patients with nonmalignant disorders and provide resources to establish such infrastructures. Unrelated donor registries should provide information on the necessity of bone marrow donation for patients with bone marrow failure,” wrote Dr. Yoshimi of the University of Freiburg, Germany, and colleagues.

Funding for the study was indirectly provided by the Worldwide Network of Blood and Marrow Transplantation. Dr. Yoshimi reported having no disclosures.

Charles Mullighan, MBBS, MD

Photo courtesy of St. Jude

Children’s Research Hospital

Research published in Cancer Cell appears to explain how the abnormal breakage and rearrangement of chromosomes in white blood cells triggers Philadelphia chromosome-like (Ph-like) acute lymphoblastic leukemia (ALL).

Genomic analysis revealed 4 chromosomal rearrangements that all resulted in a truncated version of the erythropoietin receptor (EPOR) gene and drove white blood cells to proliferate out of control.

“To our knowledge, this is a previously unknown mechanism for leukemia,” said study author Charles Mullighan, MBBS, MD, of St. Jude Children’s Research Hospital in Memphis, Tennessee.

“Our search of cancer genomic data has shown that there are many other examples of chromosomal rearrangements that alter genes’ structure, but this type—where a truncating rearrangement leads to activation—is new.”

Although Dr Mullighan and his colleagues had previously identified an abnormal chromosome rearrangement in Ph-like ALL, little was known about the biological effects of that rearrangement. So they set out to pinpoint those effects by studying human leukemic cells and mouse cells engineered to mimic Ph-like ALL.

The investigators discovered the 4 rearrangements of EPOR, all of which resulted in truncation of the cytoplasmic tail of EPOR at residues similar to those mutated in primary familial congenital polycythemia. The proximal tyrosine essential for receptor activation was preserved, but distal regulatory residues were lost.

The team said these rearrangements resulted in deregulated EPOR expression, hypersensitivity to erythropoietin stimulation, and heightened JAK-STAT activation.

The investigators noted that the rearrangements were present in all of the leukemic cells from patients, which suggests these changes were fundamental to Ph-like ALL development. The team also showed that introducing truncated EPOR in mouse B-cell progenitors gave rise to ALL in mice.

Further investigation revealed that EPOR rearrangements arise early in the development of Ph-like ALL and persist as the disease progresses.

“That finding was important because it suggests that treatments for this leukemia targeting this receptor won’t just impact a subset of the leukemia cells, allowing others to keep proliferating,” said study author Ilaria Iacobucci, PhD, of St. Jude Children’s Research Hospital.

The investigators then found that human leukemic cells with EPOR rearrangements were sensitive to JAK-STAT inhibition via treatment with ruxolitinib.

The team also cited the case of an adult patient treated at MD Anderson Cancer Research Center in Houston, Texas, whose genetic analysis revealed EPOR-rearranged ALL. That patient had not responded significantly to other chemotherapy drugs. But, when given ruxolitinib, the patient showed a major drop in leukemia cells.

In experiments with leukemic cells, the investigators found that ruxolitinib worked synergistically with 3 chemotherapeutic agents—dexamethasone, vincristine, and daunorubicin.

“We think these findings provide a useful road map for planning more accurate testing of combination chemotherapies,” Dr Mullighan said.

“These findings expand the number of ALL patients who should be amenable to precision medicine therapies that add targeted inhibitors to chemotherapy for ALL patents with specific genetic changes in the leukemia cells,” added study author Stephen Hunger, MD, of Children’s Hospital of Philadelphia in Pennsylvania.

Dr Hunger said the Children’s Oncology Group has developed a clinical trial testing this strategy with ruxolitinib, which will begin treating patients in mid-2016. Based on the results of the Cancer Cell research, the trial will include children with ALL and EPOR rearrangements. 

Charles Mullighan, MBBS, MD

Photo courtesy of St. Jude

Children’s Research Hospital

Research published in Cancer Cell appears to explain how the abnormal breakage and rearrangement of chromosomes in white blood cells triggers Philadelphia chromosome-like (Ph-like) acute lymphoblastic leukemia (ALL).

Genomic analysis revealed 4 chromosomal rearrangements that all resulted in a truncated version of the erythropoietin receptor (EPOR) gene and drove white blood cells to proliferate out of control.

“To our knowledge, this is a previously unknown mechanism for leukemia,” said study author Charles Mullighan, MBBS, MD, of St. Jude Children’s Research Hospital in Memphis, Tennessee.

“Our search of cancer genomic data has shown that there are many other examples of chromosomal rearrangements that alter genes’ structure, but this type—where a truncating rearrangement leads to activation—is new.”

Although Dr Mullighan and his colleagues had previously identified an abnormal chromosome rearrangement in Ph-like ALL, little was known about the biological effects of that rearrangement. So they set out to pinpoint those effects by studying human leukemic cells and mouse cells engineered to mimic Ph-like ALL.

The investigators discovered the 4 rearrangements of EPOR, all of which resulted in truncation of the cytoplasmic tail of EPOR at residues similar to those mutated in primary familial congenital polycythemia. The proximal tyrosine essential for receptor activation was preserved, but distal regulatory residues were lost.

The team said these rearrangements resulted in deregulated EPOR expression, hypersensitivity to erythropoietin stimulation, and heightened JAK-STAT activation.

The investigators noted that the rearrangements were present in all of the leukemic cells from patients, which suggests these changes were fundamental to Ph-like ALL development. The team also showed that introducing truncated EPOR in mouse B-cell progenitors gave rise to ALL in mice.

Further investigation revealed that EPOR rearrangements arise early in the development of Ph-like ALL and persist as the disease progresses.

“That finding was important because it suggests that treatments for this leukemia targeting this receptor won’t just impact a subset of the leukemia cells, allowing others to keep proliferating,” said study author Ilaria Iacobucci, PhD, of St. Jude Children’s Research Hospital.

The investigators then found that human leukemic cells with EPOR rearrangements were sensitive to JAK-STAT inhibition via treatment with ruxolitinib.

The team also cited the case of an adult patient treated at MD Anderson Cancer Research Center in Houston, Texas, whose genetic analysis revealed EPOR-rearranged ALL. That patient had not responded significantly to other chemotherapy drugs. But, when given ruxolitinib, the patient showed a major drop in leukemia cells.

In experiments with leukemic cells, the investigators found that ruxolitinib worked synergistically with 3 chemotherapeutic agents—dexamethasone, vincristine, and daunorubicin.

“We think these findings provide a useful road map for planning more accurate testing of combination chemotherapies,” Dr Mullighan said.

“These findings expand the number of ALL patients who should be amenable to precision medicine therapies that add targeted inhibitors to chemotherapy for ALL patents with specific genetic changes in the leukemia cells,” added study author Stephen Hunger, MD, of Children’s Hospital of Philadelphia in Pennsylvania.

Dr Hunger said the Children’s Oncology Group has developed a clinical trial testing this strategy with ruxolitinib, which will begin treating patients in mid-2016. Based on the results of the Cancer Cell research, the trial will include children with ALL and EPOR rearrangements. 

Charles Mullighan, MBBS, MD

Photo courtesy of St. Jude

Children’s Research Hospital

Research published in Cancer Cell appears to explain how the abnormal breakage and rearrangement of chromosomes in white blood cells triggers Philadelphia chromosome-like (Ph-like) acute lymphoblastic leukemia (ALL).

Genomic analysis revealed 4 chromosomal rearrangements that all resulted in a truncated version of the erythropoietin receptor (EPOR) gene and drove white blood cells to proliferate out of control.

“To our knowledge, this is a previously unknown mechanism for leukemia,” said study author Charles Mullighan, MBBS, MD, of St. Jude Children’s Research Hospital in Memphis, Tennessee.

“Our search of cancer genomic data has shown that there are many other examples of chromosomal rearrangements that alter genes’ structure, but this type—where a truncating rearrangement leads to activation—is new.”

Although Dr Mullighan and his colleagues had previously identified an abnormal chromosome rearrangement in Ph-like ALL, little was known about the biological effects of that rearrangement. So they set out to pinpoint those effects by studying human leukemic cells and mouse cells engineered to mimic Ph-like ALL.

The investigators discovered the 4 rearrangements of EPOR, all of which resulted in truncation of the cytoplasmic tail of EPOR at residues similar to those mutated in primary familial congenital polycythemia. The proximal tyrosine essential for receptor activation was preserved, but distal regulatory residues were lost.

The team said these rearrangements resulted in deregulated EPOR expression, hypersensitivity to erythropoietin stimulation, and heightened JAK-STAT activation.

The investigators noted that the rearrangements were present in all of the leukemic cells from patients, which suggests these changes were fundamental to Ph-like ALL development. The team also showed that introducing truncated EPOR in mouse B-cell progenitors gave rise to ALL in mice.

Further investigation revealed that EPOR rearrangements arise early in the development of Ph-like ALL and persist as the disease progresses.

“That finding was important because it suggests that treatments for this leukemia targeting this receptor won’t just impact a subset of the leukemia cells, allowing others to keep proliferating,” said study author Ilaria Iacobucci, PhD, of St. Jude Children’s Research Hospital.

The investigators then found that human leukemic cells with EPOR rearrangements were sensitive to JAK-STAT inhibition via treatment with ruxolitinib.

The team also cited the case of an adult patient treated at MD Anderson Cancer Research Center in Houston, Texas, whose genetic analysis revealed EPOR-rearranged ALL. That patient had not responded significantly to other chemotherapy drugs. But, when given ruxolitinib, the patient showed a major drop in leukemia cells.

In experiments with leukemic cells, the investigators found that ruxolitinib worked synergistically with 3 chemotherapeutic agents—dexamethasone, vincristine, and daunorubicin.

“We think these findings provide a useful road map for planning more accurate testing of combination chemotherapies,” Dr Mullighan said.

“These findings expand the number of ALL patients who should be amenable to precision medicine therapies that add targeted inhibitors to chemotherapy for ALL patents with specific genetic changes in the leukemia cells,” added study author Stephen Hunger, MD, of Children’s Hospital of Philadelphia in Pennsylvania.

Dr Hunger said the Children’s Oncology Group has developed a clinical trial testing this strategy with ruxolitinib, which will begin treating patients in mid-2016. Based on the results of the Cancer Cell research, the trial will include children with ALL and EPOR rearrangements. 

Survivors of childhood acute lymphoblastic leukemia (ALL) who underwent CNS-directed chemotherapy show significant attention problems that impair their functioning 2 years later, according to a report published online Feb. 8 in the Journal of Clinical Oncology.

The attention problems were isolated from intelligence and academic performance, but they still “significantly and negatively impact real-world functioning,” said Lisa M. Jacola, Ph.D. of the department of psychology and her associates at St. Jude Children’s Research Hospital, Memphis (J Clin Oncol. 2016 Feb 8. [doi: 10.1200/JCO.2015.64.3205]).

Intrathecal chemotherapy has largely replaced cranial radiation therapy to protect the CNS in childhood ALL, but most research concerning neurocognitive outcomes after this treatment has been retrospective and has involved small sample sizes. So investigators performed a prospective study using data from an ongoing trial involving a representative cohort of more than 400 patients aged 1-18 years who were treated at a single center during a 7-year period.

These patients were classified as low- or high-risk based on comprehensive biologic and clinical factors, such as blast cell immunophenotype and genotype, presenting clinical features, and early treatment response. They then received intrathecal methotrexate, cytarabine, and hydrocortisone in doses appropriate to their risk status, as well as standardized leucovorin followed by mercaptopurine and vincristine plus dexamethasone.

The researchers focused on the 211 patients who underwent comprehensive neurocognitive assessment 2 years after diagnosis and treatment. “The overall group did not significantly differ from normative expectations on measures of global intelligence (estimated IQ), academic skills (reading, math, or spelling), and learning and memory.” However, half of them were rated as below average on several measures of attention. In addition, caregivers reported a significantly greater than expected frequency of hyperactivity, impulsivity, and learning problems in the children.

This adverse effect was strongest among children who were younger than age 5 at diagnosis and among those at high risk who received more aggressive treatment.

“Our findings ... emphasize the importance of routine neurocognitive monitoring of all survivors treated with contemporary therapy.” But early detection will only be helpful if effective interventions are developed to remediate these attention and behavior problems. Research has shown that pharmacologic therapies “have reduced acceptability among survivors of childhood cancer,” so nonpharmacologic approaches would be especially useful, the researchers added.

Survivors of childhood acute lymphoblastic leukemia (ALL) who underwent CNS-directed chemotherapy show significant attention problems that impair their functioning 2 years later, according to a report published online Feb. 8 in the Journal of Clinical Oncology.

The attention problems were isolated from intelligence and academic performance, but they still “significantly and negatively impact real-world functioning,” said Lisa M. Jacola, Ph.D. of the department of psychology and her associates at St. Jude Children’s Research Hospital, Memphis (J Clin Oncol. 2016 Feb 8. [doi: 10.1200/JCO.2015.64.3205]).

Intrathecal chemotherapy has largely replaced cranial radiation therapy to protect the CNS in childhood ALL, but most research concerning neurocognitive outcomes after this treatment has been retrospective and has involved small sample sizes. So investigators performed a prospective study using data from an ongoing trial involving a representative cohort of more than 400 patients aged 1-18 years who were treated at a single center during a 7-year period.

These patients were classified as low- or high-risk based on comprehensive biologic and clinical factors, such as blast cell immunophenotype and genotype, presenting clinical features, and early treatment response. They then received intrathecal methotrexate, cytarabine, and hydrocortisone in doses appropriate to their risk status, as well as standardized leucovorin followed by mercaptopurine and vincristine plus dexamethasone.

The researchers focused on the 211 patients who underwent comprehensive neurocognitive assessment 2 years after diagnosis and treatment. “The overall group did not significantly differ from normative expectations on measures of global intelligence (estimated IQ), academic skills (reading, math, or spelling), and learning and memory.” However, half of them were rated as below average on several measures of attention. In addition, caregivers reported a significantly greater than expected frequency of hyperactivity, impulsivity, and learning problems in the children.

This adverse effect was strongest among children who were younger than age 5 at diagnosis and among those at high risk who received more aggressive treatment.

“Our findings ... emphasize the importance of routine neurocognitive monitoring of all survivors treated with contemporary therapy.” But early detection will only be helpful if effective interventions are developed to remediate these attention and behavior problems. Research has shown that pharmacologic therapies “have reduced acceptability among survivors of childhood cancer,” so nonpharmacologic approaches would be especially useful, the researchers added.

Survivors of childhood acute lymphoblastic leukemia (ALL) who underwent CNS-directed chemotherapy show significant attention problems that impair their functioning 2 years later, according to a report published online Feb. 8 in the Journal of Clinical Oncology.

The attention problems were isolated from intelligence and academic performance, but they still “significantly and negatively impact real-world functioning,” said Lisa M. Jacola, Ph.D. of the department of psychology and her associates at St. Jude Children’s Research Hospital, Memphis (J Clin Oncol. 2016 Feb 8. [doi: 10.1200/JCO.2015.64.3205]).

Intrathecal chemotherapy has largely replaced cranial radiation therapy to protect the CNS in childhood ALL, but most research concerning neurocognitive outcomes after this treatment has been retrospective and has involved small sample sizes. So investigators performed a prospective study using data from an ongoing trial involving a representative cohort of more than 400 patients aged 1-18 years who were treated at a single center during a 7-year period.

These patients were classified as low- or high-risk based on comprehensive biologic and clinical factors, such as blast cell immunophenotype and genotype, presenting clinical features, and early treatment response. They then received intrathecal methotrexate, cytarabine, and hydrocortisone in doses appropriate to their risk status, as well as standardized leucovorin followed by mercaptopurine and vincristine plus dexamethasone.

The researchers focused on the 211 patients who underwent comprehensive neurocognitive assessment 2 years after diagnosis and treatment. “The overall group did not significantly differ from normative expectations on measures of global intelligence (estimated IQ), academic skills (reading, math, or spelling), and learning and memory.” However, half of them were rated as below average on several measures of attention. In addition, caregivers reported a significantly greater than expected frequency of hyperactivity, impulsivity, and learning problems in the children.

This adverse effect was strongest among children who were younger than age 5 at diagnosis and among those at high risk who received more aggressive treatment.

“Our findings ... emphasize the importance of routine neurocognitive monitoring of all survivors treated with contemporary therapy.” But early detection will only be helpful if effective interventions are developed to remediate these attention and behavior problems. Research has shown that pharmacologic therapies “have reduced acceptability among survivors of childhood cancer,” so nonpharmacologic approaches would be especially useful, the researchers added.

Light micrograph

of cancellous bone

Patients with acute lymphoblastic leukemia (ALL) may experience significant bone loss much earlier than previously assumed, according to a study published in the journal Bone.

Investigators analyzed a cohort of adolescent and young adult ALL patients before and after their first month of chemotherapy and observed “significant alterations” to cancellous and cortical bone in this short period of time.

Previous studies to determine the changes to bone density during ALL therapy had focused on the cumulative effects of chemotherapy after months or even years of treatment.

“In clinic, we would see patients with fractures and vertebral compression during the very first few weeks of treatment,” said study author Etan Orgel, MD, of Children’s Hospital Los Angeles in California.

“But we were unaware of any study that specifically examined bone before chemotherapy and immediately after the first 30 days of treatment, which would allow us to understand the impact of this early treatment phase.”

So Dr Orgel and his colleagues conducted a prospective study of 38 patients, ages 10 to 21, who were newly diagnosed with ALL.

The team used quantitative computerized tomography (QCT) to assess leukemia-related changes to bone at diagnosis and then the subsequent effects of the induction phase of chemotherapy.

All of the patients received a 28-day induction regimen consisting of vincristine, pegylated L-asparaginase, anthracycline (daunorubicin or doxorubicin), and a glucocorticoid (either prednisone at 60 mg/m²/day for 28 days or dexamethasone at 10 mg/m²/day for 14 days).

The investigators compared the patients to age- and sex-matched controls and found that leukemia did not dramatically alter the properties of bone before chemotherapy.

However, QCT revealed significant changes during the 30-day induction phase in the 35 patients who were well enough to undergo imaging after treatment.

The patients experienced a significant decrease in cancellous volumetric bone mineral density, which was measured in the spine. The median decrease was 27% (P<0.001).

There was no significant change in cortical volumetric bone mineral density, which was measured in the tibia (−0.0%, P=0.860) or femur (−0.7%, P=0.290).

But there was significant cortical thinning in the tibia. The average cortical thickness decreased 1.2% (P<0.001), and the cortical area decreased 0.4% (P=0.014).

The femur was less affected, the investigators said. There was a decrease in average cortical thickness, but this was not significant (-0.3%, P=0.740).

To help clinicians relate to these findings, the investigators also measured bone mineral density using the older but more widely available technique of dual-energy x-ray absorptiometry. They found that it underestimated these changes as compared to QCT measurements.

“Now that we know how soon bone toxicity occurs, we need to re-evaluate our approaches to managing these changes and focus research efforts on new ways to mitigate this common yet significant adverse effect,” said study author Steven Mittelman, MD, PhD, of Children’s Hospital Los Angeles.

Light micrograph

of cancellous bone

Patients with acute lymphoblastic leukemia (ALL) may experience significant bone loss much earlier than previously assumed, according to a study published in the journal Bone.

Investigators analyzed a cohort of adolescent and young adult ALL patients before and after their first month of chemotherapy and observed “significant alterations” to cancellous and cortical bone in this short period of time.

Previous studies to determine the changes to bone density during ALL therapy had focused on the cumulative effects of chemotherapy after months or even years of treatment.

“In clinic, we would see patients with fractures and vertebral compression during the very first few weeks of treatment,” said study author Etan Orgel, MD, of Children’s Hospital Los Angeles in California.

“But we were unaware of any study that specifically examined bone before chemotherapy and immediately after the first 30 days of treatment, which would allow us to understand the impact of this early treatment phase.”

So Dr Orgel and his colleagues conducted a prospective study of 38 patients, ages 10 to 21, who were newly diagnosed with ALL.

The team used quantitative computerized tomography (QCT) to assess leukemia-related changes to bone at diagnosis and then the subsequent effects of the induction phase of chemotherapy.

All of the patients received a 28-day induction regimen consisting of vincristine, pegylated L-asparaginase, anthracycline (daunorubicin or doxorubicin), and a glucocorticoid (either prednisone at 60 mg/m²/day for 28 days or dexamethasone at 10 mg/m²/day for 14 days).

The investigators compared the patients to age- and sex-matched controls and found that leukemia did not dramatically alter the properties of bone before chemotherapy.

However, QCT revealed significant changes during the 30-day induction phase in the 35 patients who were well enough to undergo imaging after treatment.

The patients experienced a significant decrease in cancellous volumetric bone mineral density, which was measured in the spine. The median decrease was 27% (P<0.001).

There was no significant change in cortical volumetric bone mineral density, which was measured in the tibia (−0.0%, P=0.860) or femur (−0.7%, P=0.290).

But there was significant cortical thinning in the tibia. The average cortical thickness decreased 1.2% (P<0.001), and the cortical area decreased 0.4% (P=0.014).

The femur was less affected, the investigators said. There was a decrease in average cortical thickness, but this was not significant (-0.3%, P=0.740).

To help clinicians relate to these findings, the investigators also measured bone mineral density using the older but more widely available technique of dual-energy x-ray absorptiometry. They found that it underestimated these changes as compared to QCT measurements.

“Now that we know how soon bone toxicity occurs, we need to re-evaluate our approaches to managing these changes and focus research efforts on new ways to mitigate this common yet significant adverse effect,” said study author Steven Mittelman, MD, PhD, of Children’s Hospital Los Angeles.

Light micrograph

of cancellous bone

Patients with acute lymphoblastic leukemia (ALL) may experience significant bone loss much earlier than previously assumed, according to a study published in the journal Bone.

Investigators analyzed a cohort of adolescent and young adult ALL patients before and after their first month of chemotherapy and observed “significant alterations” to cancellous and cortical bone in this short period of time.

Previous studies to determine the changes to bone density during ALL therapy had focused on the cumulative effects of chemotherapy after months or even years of treatment.

“In clinic, we would see patients with fractures and vertebral compression during the very first few weeks of treatment,” said study author Etan Orgel, MD, of Children’s Hospital Los Angeles in California.

“But we were unaware of any study that specifically examined bone before chemotherapy and immediately after the first 30 days of treatment, which would allow us to understand the impact of this early treatment phase.”

So Dr Orgel and his colleagues conducted a prospective study of 38 patients, ages 10 to 21, who were newly diagnosed with ALL.

The team used quantitative computerized tomography (QCT) to assess leukemia-related changes to bone at diagnosis and then the subsequent effects of the induction phase of chemotherapy.

All of the patients received a 28-day induction regimen consisting of vincristine, pegylated L-asparaginase, anthracycline (daunorubicin or doxorubicin), and a glucocorticoid (either prednisone at 60 mg/m²/day for 28 days or dexamethasone at 10 mg/m²/day for 14 days).

The investigators compared the patients to age- and sex-matched controls and found that leukemia did not dramatically alter the properties of bone before chemotherapy.

However, QCT revealed significant changes during the 30-day induction phase in the 35 patients who were well enough to undergo imaging after treatment.

The patients experienced a significant decrease in cancellous volumetric bone mineral density, which was measured in the spine. The median decrease was 27% (P<0.001).

There was no significant change in cortical volumetric bone mineral density, which was measured in the tibia (−0.0%, P=0.860) or femur (−0.7%, P=0.290).

But there was significant cortical thinning in the tibia. The average cortical thickness decreased 1.2% (P<0.001), and the cortical area decreased 0.4% (P=0.014).

The femur was less affected, the investigators said. There was a decrease in average cortical thickness, but this was not significant (-0.3%, P=0.740).

To help clinicians relate to these findings, the investigators also measured bone mineral density using the older but more widely available technique of dual-energy x-ray absorptiometry. They found that it underestimated these changes as compared to QCT measurements.

“Now that we know how soon bone toxicity occurs, we need to re-evaluate our approaches to managing these changes and focus research efforts on new ways to mitigate this common yet significant adverse effect,” said study author Steven Mittelman, MD, PhD, of Children’s Hospital Los Angeles.

A novel DNA-based test may prove useful for identifying which chronic myeloid leukemia patients with undetectable BCR-ABL1 transcripts can safely discontinue tyrosine kinase inhibitor (TKI) therapy, according to Mary Alikian, Ph.D., of Hammersmith Hospital, London, and her colleagues.

The test can quantify very low levels of residual disease in peripheral blood samples from patients with CML in whom BCR-ABL1 transcripts were undetectable using reverse transcription quantitative polymerase chain reaction (RT-qPCR), the researchers reported in a study published online in the Journal of Molecular Diagnostics.

©Jezperklauzen/ThinkStock

Their personalized DNA-based digital PCR method rapidly identifies t(9;22) fusion junctions using targeted next-generation sequencing and generates high-performance DNA-based hydrolysis probe assays that are specific to the unique molecular footprint of each patient’s CML clone. The researchers further enhanced the sensitivity of the DNA-based approach by optimizing the technique for use on a digital PCR (dPCR) platform, which provides absolute molecular quantification without the need for a standard curve. This approach avoids laborious breakpoint mapping and improves sensitivity.

The researchers successfully mapped genomic breakpoints in all samples from 32 patients with early-stage disease. Using DNA-based dPCR, disease was quantified in 46 follow-up samples from 6 of the 32 patients, including 36 samples that were in deep molecular remission.

Digital PCR for BCR-ABL1 DNA detected persistent disease in 81% of the molecular-remission samples, outperforming both RT-dPCR (25%) and DNA-based quantitative PCR (19%), the researchers reported (J Mol Diagn. 2016;18:176e189).

Of CML patients who achieve sustained undetectable BCR-ABL1 transcripts on TKI therapy, about 60% experience the return of detectable disease after stopping TKIs and have to restart treatment. An improved method of identifying patients with the lowest likelihood of relapse would allow safe withdrawal of TKI therapy for the 40% of patients who would remain disease free.

The researchers are currently investigating the impact of residual-disease level as assessed by dPCR at the time of treatment withdrawal on outcome within the UK-based DESTINY clinical trial (Deescalation and Stopping Treatment of Imatinib, Nilotinib or Sprycel in Chronic Myeloid Leukaemia). “If validated in clinical trials of stopping TKI, the technique will permit a more personalized approach to recommendations for dose reduction or drug cessation in individual patients, ensuring that therapy is withdrawn only from patients with the highest likelihood of long-term remission,” they wrote.

Identifying genomic breakpoints as soon as CML is diagnosed would allow for the design and optimization of a patient-specific assay. Patients’ response to therapy would then be monitored via standard RT-qPCR until they have reached molecular response. Thereafter, routine monitoring would be augmented with DNA quantification by dPCR and would benefit from the publication of standardized guidelines, as with RT-qPCR.

In the future, it will therefore be important to explore not only whether the risk of relapse after withdrawal is a feature of the number of residual CML cells but also whether it relates to the degree of transcriptional activity in those cells, the researchers wrote. “We observed that 8% (3 of 36) of the samples were positive by RNA-based but negative by DNA-based methods. Conversely, in samples with detectable BCR-ABL1 DNA, there was heterogeneity in the detectability of transcript by RT-dPCR that appeared to be unrelated to the amount of BCR-ABL1 DNA detected. It should be borne in mind that RT and cDNA synthesis steps remain a potential source of variation affecting cDNA concentration, and therefore these results should be interpreted with caution.”

The researchers had no relevant disclosures. The study was supported by Leading Leukemia Research (LEUKA) charity grant 06/Q0406/47, the National Institute for Health Research Biomedical Research Center Funding Scheme, and the Imperial College High Performance Computing Service.

mdales@frontlinemedcom.com

On Twitter @maryjodales

A novel DNA-based test may prove useful for identifying which chronic myeloid leukemia patients with undetectable BCR-ABL1 transcripts can safely discontinue tyrosine kinase inhibitor (TKI) therapy, according to Mary Alikian, Ph.D., of Hammersmith Hospital, London, and her colleagues.

The test can quantify very low levels of residual disease in peripheral blood samples from patients with CML in whom BCR-ABL1 transcripts were undetectable using reverse transcription quantitative polymerase chain reaction (RT-qPCR), the researchers reported in a study published online in the Journal of Molecular Diagnostics.

©Jezperklauzen/ThinkStock

Their personalized DNA-based digital PCR method rapidly identifies t(9;22) fusion junctions using targeted next-generation sequencing and generates high-performance DNA-based hydrolysis probe assays that are specific to the unique molecular footprint of each patient’s CML clone. The researchers further enhanced the sensitivity of the DNA-based approach by optimizing the technique for use on a digital PCR (dPCR) platform, which provides absolute molecular quantification without the need for a standard curve. This approach avoids laborious breakpoint mapping and improves sensitivity.

The researchers successfully mapped genomic breakpoints in all samples from 32 patients with early-stage disease. Using DNA-based dPCR, disease was quantified in 46 follow-up samples from 6 of the 32 patients, including 36 samples that were in deep molecular remission.

Digital PCR for BCR-ABL1 DNA detected persistent disease in 81% of the molecular-remission samples, outperforming both RT-dPCR (25%) and DNA-based quantitative PCR (19%), the researchers reported (J Mol Diagn. 2016;18:176e189).

Of CML patients who achieve sustained undetectable BCR-ABL1 transcripts on TKI therapy, about 60% experience the return of detectable disease after stopping TKIs and have to restart treatment. An improved method of identifying patients with the lowest likelihood of relapse would allow safe withdrawal of TKI therapy for the 40% of patients who would remain disease free.

The researchers are currently investigating the impact of residual-disease level as assessed by dPCR at the time of treatment withdrawal on outcome within the UK-based DESTINY clinical trial (Deescalation and Stopping Treatment of Imatinib, Nilotinib or Sprycel in Chronic Myeloid Leukaemia). “If validated in clinical trials of stopping TKI, the technique will permit a more personalized approach to recommendations for dose reduction or drug cessation in individual patients, ensuring that therapy is withdrawn only from patients with the highest likelihood of long-term remission,” they wrote.

Identifying genomic breakpoints as soon as CML is diagnosed would allow for the design and optimization of a patient-specific assay. Patients’ response to therapy would then be monitored via standard RT-qPCR until they have reached molecular response. Thereafter, routine monitoring would be augmented with DNA quantification by dPCR and would benefit from the publication of standardized guidelines, as with RT-qPCR.

In the future, it will therefore be important to explore not only whether the risk of relapse after withdrawal is a feature of the number of residual CML cells but also whether it relates to the degree of transcriptional activity in those cells, the researchers wrote. “We observed that 8% (3 of 36) of the samples were positive by RNA-based but negative by DNA-based methods. Conversely, in samples with detectable BCR-ABL1 DNA, there was heterogeneity in the detectability of transcript by RT-dPCR that appeared to be unrelated to the amount of BCR-ABL1 DNA detected. It should be borne in mind that RT and cDNA synthesis steps remain a potential source of variation affecting cDNA concentration, and therefore these results should be interpreted with caution.”

The researchers had no relevant disclosures. The study was supported by Leading Leukemia Research (LEUKA) charity grant 06/Q0406/47, the National Institute for Health Research Biomedical Research Center Funding Scheme, and the Imperial College High Performance Computing Service.

mdales@frontlinemedcom.com

On Twitter @maryjodales

A novel DNA-based test may prove useful for identifying which chronic myeloid leukemia patients with undetectable BCR-ABL1 transcripts can safely discontinue tyrosine kinase inhibitor (TKI) therapy, according to Mary Alikian, Ph.D., of Hammersmith Hospital, London, and her colleagues.

The test can quantify very low levels of residual disease in peripheral blood samples from patients with CML in whom BCR-ABL1 transcripts were undetectable using reverse transcription quantitative polymerase chain reaction (RT-qPCR), the researchers reported in a study published online in the Journal of Molecular Diagnostics.

©Jezperklauzen/ThinkStock

Their personalized DNA-based digital PCR method rapidly identifies t(9;22) fusion junctions using targeted next-generation sequencing and generates high-performance DNA-based hydrolysis probe assays that are specific to the unique molecular footprint of each patient’s CML clone. The researchers further enhanced the sensitivity of the DNA-based approach by optimizing the technique for use on a digital PCR (dPCR) platform, which provides absolute molecular quantification without the need for a standard curve. This approach avoids laborious breakpoint mapping and improves sensitivity.

The researchers successfully mapped genomic breakpoints in all samples from 32 patients with early-stage disease. Using DNA-based dPCR, disease was quantified in 46 follow-up samples from 6 of the 32 patients, including 36 samples that were in deep molecular remission.

Digital PCR for BCR-ABL1 DNA detected persistent disease in 81% of the molecular-remission samples, outperforming both RT-dPCR (25%) and DNA-based quantitative PCR (19%), the researchers reported (J Mol Diagn. 2016;18:176e189).

Of CML patients who achieve sustained undetectable BCR-ABL1 transcripts on TKI therapy, about 60% experience the return of detectable disease after stopping TKIs and have to restart treatment. An improved method of identifying patients with the lowest likelihood of relapse would allow safe withdrawal of TKI therapy for the 40% of patients who would remain disease free.

The researchers are currently investigating the impact of residual-disease level as assessed by dPCR at the time of treatment withdrawal on outcome within the UK-based DESTINY clinical trial (Deescalation and Stopping Treatment of Imatinib, Nilotinib or Sprycel in Chronic Myeloid Leukaemia). “If validated in clinical trials of stopping TKI, the technique will permit a more personalized approach to recommendations for dose reduction or drug cessation in individual patients, ensuring that therapy is withdrawn only from patients with the highest likelihood of long-term remission,” they wrote.

Identifying genomic breakpoints as soon as CML is diagnosed would allow for the design and optimization of a patient-specific assay. Patients’ response to therapy would then be monitored via standard RT-qPCR until they have reached molecular response. Thereafter, routine monitoring would be augmented with DNA quantification by dPCR and would benefit from the publication of standardized guidelines, as with RT-qPCR.

In the future, it will therefore be important to explore not only whether the risk of relapse after withdrawal is a feature of the number of residual CML cells but also whether it relates to the degree of transcriptional activity in those cells, the researchers wrote. “We observed that 8% (3 of 36) of the samples were positive by RNA-based but negative by DNA-based methods. Conversely, in samples with detectable BCR-ABL1 DNA, there was heterogeneity in the detectability of transcript by RT-dPCR that appeared to be unrelated to the amount of BCR-ABL1 DNA detected. It should be borne in mind that RT and cDNA synthesis steps remain a potential source of variation affecting cDNA concentration, and therefore these results should be interpreted with caution.”

The researchers had no relevant disclosures. The study was supported by Leading Leukemia Research (LEUKA) charity grant 06/Q0406/47, the National Institute for Health Research Biomedical Research Center Funding Scheme, and the Imperial College High Performance Computing Service.

mdales@frontlinemedcom.com

On Twitter @maryjodales

PCR tubes

A new assay is more accurate than the current gold standard for detecting residual disease in patients with chronic myeloid leukemia (CML), according to a study published in The Journal of Molecular Diagnostics.

Investigators found this test, a DNA-based digital PCR (dPCR) assay, could detect persistent disease in 81% of samples taken from CML patients who were in remission according to reverse transcriptase-quantitative PCR (RT-qPCR).

RT-qPCR is currently the most widely used method for monitoring residual disease in CML patients.

“If validated in clinical trials of stopping TKIs [tyrosine kinase inhibitors], this technique [the dPCR assay] will permit a more personalized approach to recommendations for dose reduction or drug cessation in individual patients, ensuring that therapy is withdrawn only from patients with the highest chance of long-term remission,” said investigator Jane F. Apperley, MD, PhD, of Imperial College London in the UK.

For this study, Dr Apperley and her colleagues compared the sensitivity of the dPCR assay to 3 other quantitative PCR methods currently used to measure residual CML—RT-qPCR, quantitative PCR (qPCR), and reverse transcriptase-digital PCR (RT-dPCR).

Thirty-six samples were taken from 6 patients with early CML who were thought to be in deep molecular remission, as indicated by RT-qPCR results.

Repeat analysis using dPCR with preamplification detected persistent disease in 81% of the samples. In comparison, the detection rate was 25% using RT-dPCR and 19% for qPCR.

“We conclude that dPCR for BCR-ABL1 DNA is the most sensitive available method of residual disease detection in CML and may prove useful in the management of TKI withdrawal,” Dr Apperley said.

She and her colleagues believe the new assay has the potential to dramatically impact CML management. They foresee that, immediately after CML diagnosis, the patient’s genomic breakpoints would be identified, enabling the design of a patient-specific assay.

The patient’s response to therapy would be monitored using standard RT-qPCR until reaching molecular remission. At that point, routine monitoring would be augmented with dPCR, allowing better-informed treatment decisions and improved patient management.

According to Dr Apperley, the new method improves on previous methodologies in 2 key areas. First, the dPCR platform provides greater sensitivity.

And second, dPCR is a DNA-based method that allows identification of BCR-ABL1 fusion junctions by targeted next-generation sequencing. This enables the rapid generation of high-performing DNA-based hydrolysis probe assays that are specific to the individual molecular footprint of each patient’s CML clone, although the number and location of fusion junctions may vary among patients.

“The technique we describe, with which we successfully mapped a disease-specific junction in all patients tested, is relatively simple, cost-effective, and suited to a high-throughput laboratory,” Dr Apperley concluded.

PCR tubes

A new assay is more accurate than the current gold standard for detecting residual disease in patients with chronic myeloid leukemia (CML), according to a study published in The Journal of Molecular Diagnostics.

Investigators found this test, a DNA-based digital PCR (dPCR) assay, could detect persistent disease in 81% of samples taken from CML patients who were in remission according to reverse transcriptase-quantitative PCR (RT-qPCR).

RT-qPCR is currently the most widely used method for monitoring residual disease in CML patients.

“If validated in clinical trials of stopping TKIs [tyrosine kinase inhibitors], this technique [the dPCR assay] will permit a more personalized approach to recommendations for dose reduction or drug cessation in individual patients, ensuring that therapy is withdrawn only from patients with the highest chance of long-term remission,” said investigator Jane F. Apperley, MD, PhD, of Imperial College London in the UK.

For this study, Dr Apperley and her colleagues compared the sensitivity of the dPCR assay to 3 other quantitative PCR methods currently used to measure residual CML—RT-qPCR, quantitative PCR (qPCR), and reverse transcriptase-digital PCR (RT-dPCR).

Thirty-six samples were taken from 6 patients with early CML who were thought to be in deep molecular remission, as indicated by RT-qPCR results.

Repeat analysis using dPCR with preamplification detected persistent disease in 81% of the samples. In comparison, the detection rate was 25% using RT-dPCR and 19% for qPCR.

“We conclude that dPCR for BCR-ABL1 DNA is the most sensitive available method of residual disease detection in CML and may prove useful in the management of TKI withdrawal,” Dr Apperley said.

She and her colleagues believe the new assay has the potential to dramatically impact CML management. They foresee that, immediately after CML diagnosis, the patient’s genomic breakpoints would be identified, enabling the design of a patient-specific assay.

The patient’s response to therapy would be monitored using standard RT-qPCR until reaching molecular remission. At that point, routine monitoring would be augmented with dPCR, allowing better-informed treatment decisions and improved patient management.

According to Dr Apperley, the new method improves on previous methodologies in 2 key areas. First, the dPCR platform provides greater sensitivity.

And second, dPCR is a DNA-based method that allows identification of BCR-ABL1 fusion junctions by targeted next-generation sequencing. This enables the rapid generation of high-performing DNA-based hydrolysis probe assays that are specific to the individual molecular footprint of each patient’s CML clone, although the number and location of fusion junctions may vary among patients.

“The technique we describe, with which we successfully mapped a disease-specific junction in all patients tested, is relatively simple, cost-effective, and suited to a high-throughput laboratory,” Dr Apperley concluded.

PCR tubes

A new assay is more accurate than the current gold standard for detecting residual disease in patients with chronic myeloid leukemia (CML), according to a study published in The Journal of Molecular Diagnostics.

Investigators found this test, a DNA-based digital PCR (dPCR) assay, could detect persistent disease in 81% of samples taken from CML patients who were in remission according to reverse transcriptase-quantitative PCR (RT-qPCR).

RT-qPCR is currently the most widely used method for monitoring residual disease in CML patients.

“If validated in clinical trials of stopping TKIs [tyrosine kinase inhibitors], this technique [the dPCR assay] will permit a more personalized approach to recommendations for dose reduction or drug cessation in individual patients, ensuring that therapy is withdrawn only from patients with the highest chance of long-term remission,” said investigator Jane F. Apperley, MD, PhD, of Imperial College London in the UK.

For this study, Dr Apperley and her colleagues compared the sensitivity of the dPCR assay to 3 other quantitative PCR methods currently used to measure residual CML—RT-qPCR, quantitative PCR (qPCR), and reverse transcriptase-digital PCR (RT-dPCR).

Thirty-six samples were taken from 6 patients with early CML who were thought to be in deep molecular remission, as indicated by RT-qPCR results.

Repeat analysis using dPCR with preamplification detected persistent disease in 81% of the samples. In comparison, the detection rate was 25% using RT-dPCR and 19% for qPCR.

“We conclude that dPCR for BCR-ABL1 DNA is the most sensitive available method of residual disease detection in CML and may prove useful in the management of TKI withdrawal,” Dr Apperley said.

She and her colleagues believe the new assay has the potential to dramatically impact CML management. They foresee that, immediately after CML diagnosis, the patient’s genomic breakpoints would be identified, enabling the design of a patient-specific assay.

The patient’s response to therapy would be monitored using standard RT-qPCR until reaching molecular remission. At that point, routine monitoring would be augmented with dPCR, allowing better-informed treatment decisions and improved patient management.

According to Dr Apperley, the new method improves on previous methodologies in 2 key areas. First, the dPCR platform provides greater sensitivity.

And second, dPCR is a DNA-based method that allows identification of BCR-ABL1 fusion junctions by targeted next-generation sequencing. This enables the rapid generation of high-performing DNA-based hydrolysis probe assays that are specific to the individual molecular footprint of each patient’s CML clone, although the number and location of fusion junctions may vary among patients.

“The technique we describe, with which we successfully mapped a disease-specific junction in all patients tested, is relatively simple, cost-effective, and suited to a high-throughput laboratory,” Dr Apperley concluded.

Patient receiving chemotherapy

Photo by Rhoda Baer

The US Food and Drug Administration (FDA) has approved a supplemental new drug application for single-dose fosaprepitant dimeglumine (Emend) for injection.

The agency approved the substance P/neurokinin-1 (NK1) receptor antagonist for use in combination with other anti-emetic medicines to prevent delayed nausea and vomiting in adults receiving initial and repeat courses of moderately emetogenic chemotherapy (MEC).

This makes fosaprepitant dimeglumine the first intravenous NK1 receptor antagonist approved in the US for patients receiving either highly emetogenic chemotherapy or MEC.

Fosaprepitant dimeglumine has not been studied for the treatment of established nausea and vomiting.

The FDA’s latest approval of fosaprepitant dimeglumine is supported by data from a phase 3 study published in the Annals of Oncology.

Patients receiving MEC were given ondansetron and dexamethasone (n=498) or ondansetron and dexamethasone plus a single intravenous infusion of fosaprepitant dimeglumine (n=502).

The primary endpoint was complete response (CR)—defined as no vomiting and no use of rescue therapy—in the delayed phase of chemotherapy-induced nausea and vomiting, which is 25 to 120 hours after the initiation of chemotherapy.

Secondary endpoints included CR in the overall and acute phases—0 to 120 and 0 to 24 hours after MEC initiation, respectively—and no vomiting in the overall phase.

The fosaprepitant regimen improved CR significantly in the delayed and overall phases but not in the acute phase.

In the delayed phase, the CR rate was 78.9% with the fosaprepitant regimen and 68.5% with the control regimen (P<0.001). In the acute phase, the CR rate was 93.2% and 91.0%, respectively (P=0.184). Overall, the CR rate was 77.1% and 66.9%, respectively (P<0.001).

In the overall phase, the proportion of subjects with no vomiting was 82.7% with the fosaprepitant regimen and 72.9% with the control regimen (P<0.001). The proportion of patients with no significant nausea was 83.2% and 77.9%, respectively (P=0.030).

The most common adverse events reported in the fosaprepitant and control arms, respectively, were fatigue (15% vs 13%), diarrhea (13% vs 11%), neutropenia (8% vs 7%), asthenia (4% vs 3%), anemia (3% vs 2%), peripheral neuropathy (3% vs 2%), leukopenia (2% vs 1%), dyspepsia (2% vs 1%), urinary tract infection (2% vs 1%), and pain in extremity (2% vs 1%).

Fosaprepitant dimeglumine is a product of Merck. For more details on the drug, see the prescribing information.

Patient receiving chemotherapy

Photo by Rhoda Baer

The US Food and Drug Administration (FDA) has approved a supplemental new drug application for single-dose fosaprepitant dimeglumine (Emend) for injection.

The agency approved the substance P/neurokinin-1 (NK1) receptor antagonist for use in combination with other anti-emetic medicines to prevent delayed nausea and vomiting in adults receiving initial and repeat courses of moderately emetogenic chemotherapy (MEC).

This makes fosaprepitant dimeglumine the first intravenous NK1 receptor antagonist approved in the US for patients receiving either highly emetogenic chemotherapy or MEC.

Fosaprepitant dimeglumine has not been studied for the treatment of established nausea and vomiting.

The FDA’s latest approval of fosaprepitant dimeglumine is supported by data from a phase 3 study published in the Annals of Oncology.

Patients receiving MEC were given ondansetron and dexamethasone (n=498) or ondansetron and dexamethasone plus a single intravenous infusion of fosaprepitant dimeglumine (n=502).

The primary endpoint was complete response (CR)—defined as no vomiting and no use of rescue therapy—in the delayed phase of chemotherapy-induced nausea and vomiting, which is 25 to 120 hours after the initiation of chemotherapy.

Secondary endpoints included CR in the overall and acute phases—0 to 120 and 0 to 24 hours after MEC initiation, respectively—and no vomiting in the overall phase.

The fosaprepitant regimen improved CR significantly in the delayed and overall phases but not in the acute phase.

In the delayed phase, the CR rate was 78.9% with the fosaprepitant regimen and 68.5% with the control regimen (P<0.001). In the acute phase, the CR rate was 93.2% and 91.0%, respectively (P=0.184). Overall, the CR rate was 77.1% and 66.9%, respectively (P<0.001).

In the overall phase, the proportion of subjects with no vomiting was 82.7% with the fosaprepitant regimen and 72.9% with the control regimen (P<0.001). The proportion of patients with no significant nausea was 83.2% and 77.9%, respectively (P=0.030).

The most common adverse events reported in the fosaprepitant and control arms, respectively, were fatigue (15% vs 13%), diarrhea (13% vs 11%), neutropenia (8% vs 7%), asthenia (4% vs 3%), anemia (3% vs 2%), peripheral neuropathy (3% vs 2%), leukopenia (2% vs 1%), dyspepsia (2% vs 1%), urinary tract infection (2% vs 1%), and pain in extremity (2% vs 1%).

Fosaprepitant dimeglumine is a product of Merck. For more details on the drug, see the prescribing information.

Patient receiving chemotherapy

Photo by Rhoda Baer

The US Food and Drug Administration (FDA) has approved a supplemental new drug application for single-dose fosaprepitant dimeglumine (Emend) for injection.

The agency approved the substance P/neurokinin-1 (NK1) receptor antagonist for use in combination with other anti-emetic medicines to prevent delayed nausea and vomiting in adults receiving initial and repeat courses of moderately emetogenic chemotherapy (MEC).

This makes fosaprepitant dimeglumine the first intravenous NK1 receptor antagonist approved in the US for patients receiving either highly emetogenic chemotherapy or MEC.

Fosaprepitant dimeglumine has not been studied for the treatment of established nausea and vomiting.

The FDA’s latest approval of fosaprepitant dimeglumine is supported by data from a phase 3 study published in the Annals of Oncology.

Patients receiving MEC were given ondansetron and dexamethasone (n=498) or ondansetron and dexamethasone plus a single intravenous infusion of fosaprepitant dimeglumine (n=502).

The primary endpoint was complete response (CR)—defined as no vomiting and no use of rescue therapy—in the delayed phase of chemotherapy-induced nausea and vomiting, which is 25 to 120 hours after the initiation of chemotherapy.

Secondary endpoints included CR in the overall and acute phases—0 to 120 and 0 to 24 hours after MEC initiation, respectively—and no vomiting in the overall phase.

The fosaprepitant regimen improved CR significantly in the delayed and overall phases but not in the acute phase.

In the delayed phase, the CR rate was 78.9% with the fosaprepitant regimen and 68.5% with the control regimen (P<0.001). In the acute phase, the CR rate was 93.2% and 91.0%, respectively (P=0.184). Overall, the CR rate was 77.1% and 66.9%, respectively (P<0.001).

In the overall phase, the proportion of subjects with no vomiting was 82.7% with the fosaprepitant regimen and 72.9% with the control regimen (P<0.001). The proportion of patients with no significant nausea was 83.2% and 77.9%, respectively (P=0.030).

The most common adverse events reported in the fosaprepitant and control arms, respectively, were fatigue (15% vs 13%), diarrhea (13% vs 11%), neutropenia (8% vs 7%), asthenia (4% vs 3%), anemia (3% vs 2%), peripheral neuropathy (3% vs 2%), leukopenia (2% vs 1%), dyspepsia (2% vs 1%), urinary tract infection (2% vs 1%), and pain in extremity (2% vs 1%).

Fosaprepitant dimeglumine is a product of Merck. For more details on the drug, see the prescribing information.