Over the past decade, next generation sequencing was employed as one of the initials steps in defining the genomic features of the most common pediatric cancer diagnoses. The completed discovery sequencing studies were reviewed at the National Cancer Institute (NCI) Childhood Cancer Genomics Gaps and Opportunities Workshop in February 2015 . An updated list of discovery sequencing studies in pediatric malignancies is in Supplementary Table 1, http://links.lww.com/MOP/A29. Despite ongoing progress in large-scale discovery sequencing projects in pediatric cancers, for the majority of pediatric cancer diagnoses, only a small number of tumor–normal pairs have been subjected to comprehensive sequencing [4–8]. As a result, for most diagnoses, these discovery sequencing studies are underpowered to rule out the presence of recurrent mutations occurring with an incidence as high as 5–10% of cases . In addition, the genomics of many rare pediatric cancer types have not been adequately studied and few specimens from recurrent disease have been sequenced.
Completed discovery sequencing studies have revealed important aspects of the pediatric cancer genome. Compared with adult cancers, pediatric cancers harbor far fewer amino acid changing mutations per megabase of DNA . Segmental chromosomal changes, fusions and mutations in genes impacting the epigenome are important genomic mechanisms of malignant transformation in childhood cancers. In addition to these observations, discovery sequencing studies have furthered molecular classification of some diseases including identification of high-risk genomic features that are associated with prognosis and guide treatment stratification in several common pediatric malignancies such as leukemia and medulloblastoma.
However, discovery sequencing studies are not designed to assess the feasibility of the routine performance of genomic profiling in the clinic, nor do they evaluate the ability to analyze and interpret individual patient-level sequencing results that will inform approaches to patient treatment and clinical trials selection. Clinical sequencing studies, in which sequencing results are returned usually after the testing is performed in a clinical laboratory, are required to address these questions. In the last 2 years, seven pediatric oncology clinical sequencing studies have been published (Table 2) [11–17]. The first of these were comprehensively reviewed by Mody et al. [18▪], and so we will only briefly touch on the conclusions [19▪▪,20,21▪,22,23].
The completed clinical sequencing studies, which enrolled children and adolescents with relapsed, refractory or high-risk solid tumors, demonstrated the feasibility of clinical sequencing at a single site or across multiple sites using a central laboratory. The technical success rate was high even when specimens collected for clinical purposes were used for sequencing. In addition, practices for returning results to treating providers and patient families (often including germline testing) were established and patient and provider perceptions of tumor profiling and germline sequencing are beginning to be assessed . The diverse sequencing platforms used in each study resulted in similar rates (30–60%) of potentially actionable variants. When assessed, relatively few patients in these initial studies (3–18% of the study populations) received targeted therapy matched to an identified actionable variant. This is not surprising as the study design and limited duration of clinical follow-up preclude the evaluation of the impact of receipt of matched targeted treatments on outcomes. Nevertheless, these initial clinical sequencing studies set the stage for subsequent precision clinical trials that are prospectively designed to assess the impact of molecularly targeted therapies in pediatric oncology [19▪▪].
PRECISION MEDICINE TRIALS
The design of precision oncology trials must be responsive to rapid evolutions in genomic technologies, our understanding of the landscape of the cancer genome, and the availability of targeted therapeutics. The regulatory environment is another factor that may be associated with unanticipated changes. As a result of these and other factors, precision oncology trial designs, mostly developed in the context of adult cancers, are still constantly changing. Despite this, we have attempted to classify the pediatric precision trials discussed below into four groups (Table 3) based on patient population (eligibility) and design. We provide examples of some of the precision medicine trials in pediatric oncology as a way of highlighting the key aspects of precision medicine trial design relevant to pediatric oncology [25,26].
Basket trials in relapsed/refractory cancers across multiple histologies
Precision trials with the largest scope are referred to as ‘basket trials’. These trials span cancer diagnoses and the results of sequencing are used to identify actionable variants linked to eligibility for clinical trial arms of targeted therapeutics. A basket trial is the ideal design when genomic variants that may predict response to a targeted therapy of interest occur at either a low or unknown frequency across diseases. Our limited understanding of the frequency of genomic variants and their oncogenic potential in many pediatric cancers means basket trials play an important role in the development of targeted therapies in pediatric oncology.
Now underway in the United States and Europe are major basket trial initiatives for children and adolescents with relapsed or refractory pediatric cancers. In the United States, the Children's Oncology Group (COG)–NCI Pediatric MATCH (Molecular Analysis for Therapy Choice) trial, opened for patient enrollment in July 2017 [27▪▪]. The Pediatric MATCH was developed following initiation of a counterpart trial for adult cancer patients, the NCI-MATCH trial [28–30]. Children and adolescents aged 1–21 years with recurrent or refractory solid tumors, non-Hodgkin lymphomas or histiocytoses are eligible for enrollment. A sample of the patients’ relapsed tumor (except for diffuse intrinsic pontine glioma in which a diagnostic biopsy is allowed) is submitted for sequencing utilizing an assay developed specifically for the MATCH trial. The sequencing platform utilizes amplicon technology for mutation detection and dual primer multiplexed RNA-based PCR for fusion detection. Sequencing data is analyzed to determine whether an actionable mutation of interest is present. Actionable mutations of interest are predetermined for each trial arm. There are currently seven treatment arms (Table 4), with additional arms expected to open in the future.
Treatment arms are selected for inclusion in the pediatric COG–NCI Pediatric MATCH if there is already existing evidence from a clinical trial linking gene variants to response to the targeted therapy. For targeted therapy arms in which clinical evidence exists but is more limited, such as case reports, there also needs to be laboratory preclinical investigation providing evidence that the gene variants are credible biomarkers of response to the targeted therapy. Of note, the clinical evidence utilized does not need to be from the same cancer type as the hypothesis being tested in a basket trial is that the biomarker will predict response to targeted therapy regardless of cancer type. In the COG–NCI Pediatric MATCH trial, at least 20 patients will be enrolled in each treatment arm and the primary outcome measure for each trial arm is objective response rate (RR).
The European Proof-of-Concept Therapeutic Stratification Trial of Molecular Anomalies in Relapsed or Refractory Tumors in Children [AcSé-ESMART (Secured Access Program of the French National Cancer Institute (INCa)] opened for enrollment in August 2016. The ESMART trial is part of the Innovative Therapies for Children with Cancer Precision Cancer Medicine Program, a European academic consortium [31▪▪,32,33]. Children and adolescents aged 0–18 years with relapsed or refractory solid tumors and leukemias are eligible. Patients must have had advanced molecular profiling of their recurrent or refractory tumor performed in one of the ongoing clinical sequencing studies in Europe such as A multicentric, prospective proof-of-concept study MoleculAr Profiling for Pediatric and Young Adult Cancer Treatment Stratification or INdividualized therapy FOr Relapsed Malignancies. Most of these European clinical sequencing studies subject samples to multiple sequencing platforms including whole exome sequencing, RNA sequencing, and whole genome sequencing. Sequencing data are reviewed and examined at a multidisciplinary molecular tumor board to determine whether an actionable variant is present and whether the actionable variant is a match for one of the ESMART trial arms or other targeted agent trials. Currently, ESMART has seven treatment arms for five genomic targets/pathways (Table 4). Each of the treatment arms are run as an independent clinical trial, with a phase 1 dose escalation phase and a phase 2 expansion phase. Accordingly, each arm will enroll six to 38 patients. Unlike the Pediatric MATCH trial, many of the treatment arms include a targeted therapy agent in combination with another targeted agent or conventional cytotoxic chemotherapy. In addition to clearly defined biomarkers, the trial intends to explore through an enrichment strategy the role of nonwell defined molecular alterations in regard to their sensitivity to the targeted treatment. The ESMART trial enrolled 31 patients in the first 6 months .
The juxtaposition of the Pediatric MATCH and ESMART trials (Table 4) reveals variability in approaches to basket trial design. Each design has unique strengths and weaknesses. Thus, efforts to compare results, particularly if primary clinical and sequencing data are shared across continents, will lead to additional insights useful to inform design of future basket trials in pediatric oncology.
Disease-specific umbrella trials in relapsed disease
The term umbrella trial has been used to mean a basket trial limited to a single diagnosis. An umbrella design may be preferable when previous discovery sequencing has led to a relatively good understanding of the potentially actionable mutations seen in a particular diagnosis and the frequency of such variants is high enough that a study in that disease alone is feasible. Umbrella trials in relapsed disease are currently underway in neuroblastoma, and leukemia, which is not surprising as these are the pediatric cancers for which there has been a relatively large number of tumor–normal pairs subjected to discovery sequencing.
Discovery sequencing studies in acute lymphoblastic leukemia (ALL) led to the identification and characterization of Philadelphia chromosome-like (Ph-like) ALL [4,35], a molecular subtype occurring in approximately 15% of children, adolescents and young adults and associated with a significantly poorer outcome [36,37]. Ph-like ALL is characterized by presence of a kinase-activated gene expression profile similar to BCR–ABL translocation positive leukemia but without the BCR–ABL fusion. Ph-like ALLs have gene variants that activate kinase or cytokine signaling including rearrangements involving ABL1/2, CSF1R, PDGFRB and rearrangements and mutations in CRLF2, JAK2 and EPOR . Preclinical studies and case reports suggested sensitivity to targeted treatments with JAK inhibitors or tyrosine kinase inhibitors [37,38].
A single institution trial enrolling patients 10 years and older with relapsed or refractory ALL with Ph-like genetic lesion(s) or evidence of CRLF2 positivity by flow cytometry is combining reinduction chemotherapy with either ruxolitinib, a Jak inhibitor or dasatinib, an Abl/Src kinase inhibitor based on the gene variants identified . It is interesting to note that this biomarker – driven phase 2 study is, from study initiation, enrolling patients 10 and above. Such an approach, in which eligibility criteria are expanded to allow younger patients to enroll in earlier phase trials, has been supported in recent statements from the US Food and Drug Administration (FDA) and from a multistakeholder task force including the American Society of Clinical Oncology [40,41].
ALK is mutated in approximately 10% of neuroblastomas . Sequencing of paired diagnostic and relapsed samples has revealed a higher rate of ALK mutations at relapse of approximately 25% [42–45]. In-vitro screening of eight targeted agents in 17 well characterized human neuroblastoma-derived cell lines revealed sensitivity of ALK mutated lines to the combination of CDK4 inhibitor ribociclib and ALK inhibitor ceritinib . Based on this and other preclinical evidence, the Next Generation Personalized Neuroblastoma Therapy trial was designed. Patients are eligible if they have relapsed or refractory neuroblastoma and are age 1–21 years. Biopsy is performed for tumor assessment with deep sequencing to identify mutations in the ALK or RAS–MAPK pathways. Patients whose tumors have an ALK pathway mutation receive a combination of ceritinib and ribociclib, and those with a RAS–MAPK alteration receive trametinib. Patients without an ALK or RAS/MAPK pathway alteration and with wild-type TP53, are enrolled onto the third treatment arm and receive HDM201, an oral HDM2 inhibitor.
Single-agent targeted therapy in advanced cancers
Early phase trials of a single targeted agent when eligibility criteria include a genomic biomarker are contributing to our understanding of genomics and activity of targeted agents in pediatric cancers. These trials tend to be industry sponsored and often utilize drugs primarily developed for gene variants present in the more common adult cancers. Previously, this type of pediatric early phase trial was often conducted several years after the therapy was proven effective in biomarker positive adult cancers and in some cases, pediatric patients whose tumors lacked the appropriate biomarker were enrolled. One example of delayed development in pediatric malignancies is the BRAF inhibitor vemurafenib. In 2011, vemurafenib was approved by the FDA for unresectable or metastatic melanoma harboring BRAF V600E mutations . In 2010, it was reported that a proportion of pediatric gliomas harbored the BRAF V600E mutation, yet the first clinical trial of vemurafenib in pediatric patients with recurrent or refractory BRAF-mutant gliomas did not open until 2014 . Of note, a phase 1 trial of the BRAF V600E inhibitor dabrafenib and a phase 1/2 of the MEK inhibitor selumetinib were initiated prior to this. An example of a phase 2 trial of a targeted therapy enrolling biomarker positive and biomarker unknown pediatric patients is the phase 1/2 trial of an ALK inhibitor crizotinib in pediatric patients with refractory solid tumors or anaplastic large-cell lymphoma . The trial had a three-part design: a dose escalation component for all patients (with or without confirmed ALK biomarker) to determine the maximum tolerated dose, an expanded cohort of patients with confirmed ALK variants, and an additional cohort of neuroblastoma patients. The results of this phase 1/2 trial highlight both the promise and challenges in bringing targeted therapies to pediatric malignancies using this type of trial design. Dramatic and durable responses were observed in anaplastic large-cell lymphoma and inflammatory myofibroblasic tumors harboring ALK fusions. There were mixed results in neuroblastoma patients because only a subset of the enrolled neuroblastoma patients had ALK variants and the ALK mutations present in neuroblastoma are different than the ALK variants in lung cancer, the disease for which crizotinib was developed.
More recently, there has been an effort to initiate early phase trials of targeted therapies in pediatric patients earlier in the clinical development pipeline. A particularly successful example is the phase 1 trial of the Trk inhibitor larotrectinib for TRK fusion positive malignancies. Preliminary results from larotrectinib phase 1 trials in pediatric and adult patients, which were recently presented together, showed an objective RR of 91%. There were no responses in patients whose tumors lacked TRK fusions [50▪].
Disease-specific precision trials in newly diagnosed patients
The ultimate goal of precision medicine is to increase cure rates and decrease toxicity of cancer treatment. This will only be realized when we have incorporated, into standard care of newly diagnosed patients, clinical sequencing for more refined risk stratification and/or, as an indication to utilize matched targeted therapy in upfront treatment regimens. As with umbrella trials, precision trials in newly diagnosed patients require an understanding of the gene variants likely to be encountered in a specific diagnosis. In addition, there should be disease-specific evidence linking gene variants to prognosis and/or activity of targeted therapies. Several trials are profiling leukemia samples from patients newly diagnosed ALL for the presence of the Ph-like expression signature and/or for the presence of Ph-like ALL associated variants. These trials are evaluating outcomes for patients who receive standard ALL therapy in combination with tyrosine kinase inhibitors for BCR–ABL positive or Philadelphia-like leukemia with kinase variants and JAK inhibitors for leukemias with JAK/STAT alterations (Table 3).
In medulloblastoma, large-scale sequencing efforts have revealed four distinct molecular subgroups with significant implications for prognosis and treatment [51,52▪]. Clinical trials in newly diagnosed medulloblastoma patients are now incorporating upfront molecular sequencing for risk stratification and treatment assignment. St. Jude's current study for newly diagnosed medulloblastoma patients is evaluating whether good outcomes seen in the WNT molecular subgroup are maintained with reduced treatment intensity. For patients with sonic hedgehog (SHH) pathway mutated medulloblastoma, a SHH inhibitor is being added as a maintenance therapy after conventional cytotoxic chemotherapy to determine whether this strategy improves outcomes for this subset.
One unifying feature in precision trials in newly diagnosed patients with pediatric malignancies is worth noting. Because of the small size of the genomically defined subgroup selected for intervention, all utilize a single-arm design as opposed to randomized design. In other words, the impact of the intervention in the genomically defined patient population will be assessed via comparison with a historical population. The inability to conduct randomized trials is likely to be a common issue in precision trials for newly diagnosed pediatric oncology patients and strategies to address potential challenges encountered when analyzing results of single-arm trials are likely to be needed.
CONCLUSION AND FUTURE DIRECTIONS
The field of precision medicine in pediatric oncology has seen a number of advances in the last decade, and there are now a range of precision trials available for children with cancer. The initial set of pediatric precision oncology trials will improve our understanding of the clinical impact of targeted therapies. Correlative biology studies embedded in these precision trials (such as efforts to use cell free DNA assays for detecting gene variants) and sharing of resulting clinical and genomic data elements for secondary analyses will lead to further understanding of the pediatric cancer genome and new discoveries. Finally, continued drug development, discovery sequencing and preclinical biologic investigation are likely to expand opportunities for precision oncology in pediatric cancers.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
REFERENCES AND RECOMMENDED READING
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basket trial; molecular profiling; pediatric cancer; precision medicine; targeted therapy
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