Characteristics and outcome of pediatric patients enrolled in phase I oncology trials

Clinical trial inclusion in patients with relapsed/refractory neuroblastoma following the European Precision Cancer Medicine trial MAPPYACTS

INTRODUCTION

Despite poor survival for patients with relapsed or refractory neuroblastoma, only 10-16% of patients are reported to be included in early phase trials. This study aimed to explore the impact of molecular profiling within the prospective precision cancer medicine trial MAPPYACTS (NCT02613962) on subsequent early phase trial recruitment and treatment by matched targeted therapies in this population.

METHODS AND MATERIALS

Clinical data from all French patients with relapsed/refractory neuroblastoma enrolled in MAPPYACTS were analyzed for subsequent matched/non-matched targeted treatment based on clinical tumor board (CMTB) recommendations.

RESULTS

From 93 patients with neuroblastoma included in French centers, 78 (84%) underwent whole exome and RNA sequencing and were discussed in the CMTB. Higher rate of successful sequencing analysis was observed in patients with relapsed disease compared to those with refractory disease (p = 0.0002). Among the 50 patients that presented with a new disease relapse/progression after the CMTB recommendations, 35 patients (70%) had at least one actionable alteration identified on the tumor at the time of relapse. Eighteen patients (36%) were included in an early phase clinical trial, 11 of these with a matched agent, 7 with a non-matched treatment; 13 patients were included in the AcSé ESMART trial. Five patients (10%) received a matched targeted therapy outside a clinical trial.

CONCLUSION

Patients with neuroblastoma in the European MAPPYACTS trial were more likely to be included in early phase trials compared to previous reports. Early deep sequencing at first treatment failure, comprehensive therapeutic discussions in molecular tumor boards and innovative trials like AcSé -ESMART improve access to innovative therapies for patients with relapsed/refractory neuroblastoma.

CLINICAL TRIAL REGISTRATION

NCT02613962.

Views of IRB members regarding phase 1 pediatric oncology trials

There is significant debate over whether phase 1 pediatric oncology trials are ethical and approvable. We thus surveyed IRB members to answer four questions. First, do IRB members think the potential medical benefits of average phase 1 pediatric oncology trials justify the risks? Second, do they think these trials are ethically appropriate? Third, do they think these trials are approvable? Fourth, how do the views of IRB members on the first two questions compare to the views of the US public? Of the 80 respondents who answered the test questions correctly, 18.8% stated that the potential medical benefits of average phase 1 pediatric oncology trials outweigh the risks, 32.5% stated that the potential medical benefits and risks are about equal, and 48.8% stated that the risks outweigh the potential medical benefits. Compared to the general public, IRB members were significantly more likely to think the risks outweigh the potential medical benefits (p = 0.01). Finally, 68.8% of IRB members indicated that average phase 1 pediatric oncology trials are approvable, and 56.3% indicated that these trials are appropriate in children. These findings suggest two-thirds of IRB members believe average phase 1 pediatric oncology trials are approvable. Yet, almost half regard the risks as outweighing the potential medical benefits and almost half think these trials are inappropriate. These findings raise important questions regarding why IRB members and the general public evaluate the same risk/benefit profile differently, and whether it is possible to reconcile the two perspectives.

Access to early-phase clinical trials for children with relapsed and refractory neuroblastoma: A multicentre international study

OBJECTIVES

Neuroblastoma is the most common extracranial tumour in children, and prognosis for refractory and relapsed disease is still poor. Early-phase clinical trials play a pivotal role in the development of novel drugs. Ensuring adequate recruitment is crucial. The primary aim was to determine the rate of participation trials for children with refractory/relapsed neuroblastoma in two of the largest drug development European institutions.

METHODS

Data from patients diagnosed with refractory/relapsed neuroblastoma between January 2012 and December 2018 at the two institutions were collected and analysed.

RESULTS

Overall, 48 patients were included. A total of 31 (65%) refractory/relapsed cases were enrolled in early-phase trials. The main reasons for not participating in clinical trials included not fulfilling eligibility criteria prior to consent (12/17, 70%) and screening failure (2/17, 12%). Median time on trial was 4.3 months (range 0.6-13.4). Most common cause for trial discontinuation was disease progression (67.7%). Median overall survival was longer in refractory (28 months, 95% CI: 20.9-40.2) than in relapsed patients (14 months, 95% CI: 8.1-20.1) (p = .034).

CONCLUSIONS

Although two thirds of children with refractory/relapsed neuroblastoma were enrolled in early-phase trials, recruitment rates can still be improved. The main cause for not participating on trials was not fulfilling eligibility criteria prior to consent, mainly due to performance status and short life expectancy. This study highlights the hurdles to access to innovative therapies for children with relapsed/refractory neuroblastomas, and identifies key areas of development to improve recruitment to early-phase trials.

The European MAPPYACTS Trial: Precision Medicine Program in Pediatric and Adolescent Patients with Recurrent Malignancies

ABSTRACT

MAPPYACTS (NCT02613962) is an international prospective precision medicine trial aiming to define tumor molecular profiles in pediatric patients with recurrent/refractory malignancies in order to suggest the most adapted salvage treatment. From February 2016 to July 2020, 787 patients were included in France, Italy, Ireland, and Spain. At least one genetic alteration leading to a targeted treatment suggestion was identified in 436 patients (69%) with successful sequencing; 10% of these alterations were considered "ready for routine use." Of 356 patients with follow-up beyond 12 months, 107 (30%) received one or more matched targeted therapies-56% of them within early clinical trials-mainly in the AcSé-ESMART platform trial (NCT02813135). Overall, matched treatment resulted in a 17% objective response rate, and of those patients with ready for routine use alterations, it was 38%. In patients with extracerebral tumors, 76% of actionable alterations detected in tumor tissue were also identified in circulating cell-free DNA (cfDNA).

SIGNIFICANCE

MAPPYACTS underlines the feasibility of molecular profiling at cancer recurrence in children on a multicenter, international level and demonstrates benefit for patients with selected key drivers. The use of cfDNA deserves validation in prospective studies. Our study highlights the need for innovative therapeutic proof-of-concept trials that address the underlying cancer complexity. This article is highlighted in the In This Issue feature, p. 1171.

Approaches for Discussing Clinical Trials with Pediatric Oncology Patients and Their Families

PURPOSE OF REVIEW

This manuscript aims to describe evidence-based best practices to guide clinicians in communicating with pediatric patients and their families about clinical trial enrollment.

RECENT FINDINGS

The standard paradigm for discussing clinical trial enrollment with pediatric oncology patients and their families inconsistently enables or facilitates true informed consent. Evidence exists to suggest that adopting a shared decision-making approach may improve patient and family understanding. When navigating communication about clinical trials, clinicians should integrate the following evidence-based communication approaches: (1) extend dialogue about clinical trial enrollment across multiple conversations, allowing families space and time to process information independently; (2) use core communication skills such as avoiding jargon, checking for understanding, and responding to emotion. Clinicians should consider factors at the individual, team, organizational, community, and policy levels that may impact clinical trial communication with pediatric cancer patients and their families. This article reviews learnable skills that clinicians can master to optimize communication about clinical trial enrollment with pediatric cancer patients and their families.

Acceptable Risks in Pediatric Research: Views of the US Public

BACKGROUND AND OBJECTIVES

Critics argue that it is unethical to expose children to research risks for the benefit of others, whereas many regulations permit "net-risk" pediatric research but only when the risks are minimal. In the present survey, we assessed whether the US public agrees with these views and whether the US public's views regarding the acceptability of net-risk pediatric research are influenced by its social value.

METHODS

A 15-minute survey of a nationally representative sample of US adults. Participants were randomly assigned to 1 of 4 hypothetical scenarios involving procedures that pose increasing levels of risk. To assess whether respondents' views on the acceptability of the risks is influenced by the social value of the research, in each of the 4 scenarios we described the respective procedure being used in 3 studies with increasing levels of social value.

RESULTS

A total 1658 of the 2508 individuals who were sent the survey link participated (response rate = 66.1%). Approximately 91% approved of a research blood draw in minors, and ∼69% approved of a research bone marrow biopsy. The proportion who indicated that the respective procedure was acceptable increased as the study's social value increased. This effect was significantly stronger for studies which pose greater risks compared with studies with lower risks (P < .001).

CONCLUSIONS

The vast majority of the US public supports net-risk pediatric research that poses minimal risk, and a majority supports net-risk pediatric research that poses somewhat greater risks, provided it has high social value. These findings offer important information for assessing when it is acceptable to conduct net-risk pediatric research.

Do the Potential Medical Benefits of Phase 1 Pediatric Oncology Trials Justify the Risks? Views of the United States Public

OBJECTIVES

To assess the US public's views on whether the potential medical benefits of phase 1 pediatric oncology trials justify the risks.

STUDY DESIGN

Online survey of a nationally representative sample of US adults. Participants were presented with a hypothetical scenario in which they have a 10-year-old child with advanced cancer. They were then offered the option of giving their child supportive care or trying one more potential treatment, in the research or clinical care setting, which has the same risks and potential medical benefits as the average phase 1 pediatric oncology trial. We assessed what percentage of respondents thought the potential medical benefits justify the risks.

RESULTS

In total, 1658 of the 2508 individuals who were sent the survey participated (response rate = 66.1%). Of those who passed all 3 test questions indicating understanding, 67.1% in the research scenario and 58.5% in the clinical care scenario regarded the potential medical benefits of an average phase 1 pediatric oncology trial as equal to or greater than the risks. In addition, 53.4% of respondents in the research scenario thought it was appropriate for researchers to conduct a study in children with these risks and potential medical benefits, and 46.9% stated they would enroll their own child in such a trial.

CONCLUSIONS

A majority of the US public regards the potential medical benefits of average phase 1 pediatric oncology trials as justifying the risks. This finding suggests that these trials are ethically appropriate and approvable in patients who have no more effective treatment options. At the same time, a significant minority thought the potential medical benefits do not justify the risks, suggesting these trials should be approved only when they have significant social value. Moreover, approximately one-half of respondents regarded the trials as inappropriate and would not enroll their own child, underscoring the need for a rigorous informed consent process that accurately educates parents regarding the risks, potential medical benefits, and alternatives, so they can decide whether to enroll their child based on their own preferences and goals.

Parents' Insights into Pediatric Oncology Phase I Clinical Trials: Experiences from Their Child's Participation

OBJECTIVES

Phase 1 clinical trials are essential in the development of novel therapies for childhood cancers. Children with cancer can participate in phase 1 clinical trials when no known curative therapy remains. Understanding the experiences of children and their families in these clinical trials can help ensure that participation supports the children's and parents' well-being. This article explores the specific aspects of pediatric oncology phase 1 trials that parents found particularly challenging.

DATA SOURCES

This qualitative, empirical phenomenology study considered 11 parents' experiences during the time their child with cancer participated in a phase 1 clinical trial. The primary study results were previously reported. This article reports parents' insights into the processes and procedures that occurred as part of participation in a pediatric oncology phase 1 trial.

CONCLUSION

Parents' experiences during the phase 1 clinical trials were primarily positive. However, data analysis revealed five aspects of these trials that were challenging for families: learning about clinical trials, being referred to another institution, research-only procedures, adhering to trial requirements, and oral medications.

IMPLICATIONS FOR NURSING PRACTICE

Although experiences during phase 1 clinical trials were positive overall, opportunities to enhance children's and parents' experiences warrant attention. Enhancing the education provided to families during recruitment and minimizing the logistical burdens associated with trial requirements through care coordination may alleviate challenges experienced by children and parents.

Opportunities and Challenges in Drug Development for Pediatric Cancers

The use of targeted small-molecule therapeutics and immunotherapeutics has been limited to date in pediatric oncology. Recently, the number of pediatric approvals has risen, and regulatory initiatives in the United States and Europe have aimed to increase the study of novel anticancer therapies in children. Challenges of drug development in children include the rarity of individual cancer diagnoses and the high prevalence of difficult-to-drug targets, including transcription factors and epigenetic regulators. Ongoing pediatric adaptation of biomarker-driven trial designs and further exploration of agents targeting non-kinase drivers constitute high-priority objectives for future pediatric oncology drug development. SIGNIFICANCE: Increasing attention to drug development for children with cancer by regulators and pharmaceutical companies holds the promise of accelerating the availability of new therapies for children with cancer, potentially improving survival and decreasing the acute and chronic toxicities of therapy. However, unique approaches are necessary to study novel therapies in children that take into account low patient numbers, the pediatric cancer genomic landscape and tumor microenvironment, and the need for pediatric formulations. It is also critical to evaluate the potential for unique toxicities in growing hosts without affecting the pace of discovery for children with these life-threatening diseases.

Phase I trials and therapeutic intent in the age of precision oncology: What is a patient's chance of response?

The advancement of therapeutic strategies in oncology such as precision oncology has generated significant interest in better estimating the response of modern phase I cancer clinical trials. These estimates have varied widely. In this commentary, we provide an umbrella review of phase I response rates and discuss methodological reasons for variation in prior estimates which include limited use of unpublished data, the inclusion of expansion cohorts that artificially raise response rates of cumulative response rates, varying enrolment of haematologic malignancies, and increased next in class drugs.

A Systematic Review of Pediatric Phase I Trials in Oncology: Toxicity and Outcomes in the Era of Targeted Therapies

BACKGROUND

Pediatric phase I oncology trials have historically focused on safety and toxicity, with objective response rates (ORRs) <10%. Recently, with an emphasis on targeted approaches, response rates may have changed. We analyzed outcomes of recent phase I pediatric oncology trials.

MATERIALS AND METHODS

This was a systematic review of phase I pediatric oncology trials published in 2012-2017, identified through PubMed and EMBASE searches conducted on March 14, 2018. Selection criteria included full-text articles with a pediatric population, cancer diagnosis, and a dose escalation schema. Each publication was evaluated for patient characteristics, therapy type, trial design, toxicity, and response.

RESULTS

Of 3,431 citations, 109 studies (2,713 patients) met eligibility criteria. Of these, 78 (72%) trials incorporated targeted therapies. Median age at enrollment/trial was 11 years (range 3-21 years). There were 2,471 patients (91%) evaluable for toxicity, of whom 300 (12.1%) experienced dose-limiting toxicity (DLT). Of 2,143 patients evaluable for response, 327 (15.3%) demonstrated an objective response. Forty-three (39%) trials had no objective responses. Nineteen trials (17%) had an ORR >25%, of which 11 were targeted trials and 8 were combination cytotoxic trials. Targeted trials demonstrated a lower DLT rate compared with cytotoxic trials (10.6% vs. 14.7%; p = .003) with similar ORRs (15.0% vs. 15.9%; p = .58).

CONCLUSION

Pediatric oncology phase I trials in the current treatment era have an acceptable DLT rate and a pooled ORR of 15.3%. A subset of trials with target-specific enrollment or combination cytotoxic therapies showed high response rates, highlighting the importance of these strategies in early phase trials.

IMPLICATIONS FOR PRACTICE

Enrollment in phase I oncology trials is crucial for development of novel therapies. This systematic review of phase I pediatric oncology trials provides an assessment of outcomes of phase I trials in children, with a specific focus on the impact of targeted therapies. These data may aid in evaluating the landscape of current phase I options for patients and enable more informed communication regarding risk and benefit of phase I clinical trial participation. The results also suggest that, in the current treatment era, there is a rationale to increase earlier access to targeted therapy trials for this refractory patient population.

Utilization of palliative care consultations in pediatric oncology phase I clinical trials

Pediatric phase I clinical oncology trials represent a unique cohort of patients who have not responded to standard therapies and remain highly vulnerable to treatment toxicity and/or disease burden. Incorporating a palliative care consultation into the care plan for those with relapsed/refractory cancer where chance of cure is limited is generally recommended. A retrospective chart review of pediatric phase I trials revealed that palliative care was consulted in <20% of patients, most often for symptom management. Efforts to increase the use of palliative services in this population may enhance quality of life for children and families enrolled in phase I studies.

Immunotherapy of Relapsed and Refractory Solid Tumors With Ex Vivo Expanded Multi-Tumor Associated Antigen Specific Cytotoxic T Lymphocytes: A Phase I Study

PURPOSE

Tumor-associated antigen cytotoxic T cells (TAA-Ts) represent a new, potentially effective and nontoxic therapeutic approach for patients with relapsed or refractory solid tumors. In this first-in-human trial, we investigated the safety of administering TAA-Ts that target Wilms tumor gene 1, preferentially expressed antigen of melanoma, and survivin to patients with relapsed/refractory solid tumors.

MATERIALS AND METHODS

TAA-T products were generated from autologous peripheral blood and infused over three dose levels: 1, 2, and 4 × 10⁷ cells/m². Patients were eligible for up to eight infusions administered 4 to 7 weeks apart. We assessed dose limiting toxicity during the first 45 days after infusion. Disease response was determined within the context of a phase I trial.

RESULTS

There were no dose-limiting toxicities. Of 15 evaluable patients, 11 (73%) with stable disease or better at day 45 postinfusion were defined as responders. Six responders remain without progression at a median of 13.9 months (range, 4.1 to 19.9 months) after initial TAA-Ts. Patients who were treated at the highest dose level showed the best clinical outcomes, with a 6-month progression-free survival of 73% after TAA-T infusion compared with a 38% 6-month progression-free survival with prior therapy. Antigen spreading and a reduction in circulating tumor-associated antigens using digital droplet polymerase chain reaction was observed in patients after TAA-T infusion.

CONCLUSION

TAA-Ts safely induced disease stabilization, prolonged time to progression, and were associated with antigen spreading and a reduction in circulating tumor-associated antigen DNA levels in patients with relapsed/refractory solid tumors without lymphodepleting chemotherapy before infusion. TAA-Ts are a promising new treatment approach for patients with solid tumors.

Well-Being of Child and Family Participants in Phase 1 Pediatric Oncology Clinical Trials

PROBLEM IDENTIFICATION

Pediatric oncology phase 1 clinical trials (P1Ts) are essential to developing new anticancer therapies; however, they raise complex ethical concerns about balancing the need for this research with the well-being of participating children. The purpose of this integrative review was to synthesize and appraise the evidence of how P1T participation, which begins with consent and ends with the transition off the P1T, can affect the well-being (either positively or negatively) of children with cancer. The Resilience in Individuals and Families Affected by Cancer Framework, which has an outcome of well-being, was used to synthesize findings.

LITERATURE SEARCH

Articles on the experiences of child (n = 21) and adult (n = 31) P1T participants were identified through systematic searches.

DATA EVALUATION

Articles were evaluated on rigor and relevance to P1T participant experiences as high, medium, or low.

SYNTHESIS

Minimal empirical evidence was found regarding the effect of P1T participation on the well-being of children with cancer. Adult P1T participant experiences provide insights that could also be important to children's P1T experiences.

IMPLICATIONS FOR PRACTICE

To achieve a balanced approach in P1T consent discussions, nurses and healthcare providers who work with children considering participation in a P1T should share the potential effect of participation on participants' well-being.

Evaluating the effects of design parameters on the performances of phase I trial designs

Numerous designs have been proposed for phase I clinical trials. Although studies have compared their performances, few have considered the effects of changing design parameters. In this article, we review a few popular designs, including the 3 + 3, continuous reassessment method (CRM), Bayesian optimal interval (BOIN) design, and Keyboard design, and evaluate how varying design parameters (such as number of dose levels, target toxicity rate, maximum sample size, and cohort size) could impact the performances of each design through simulations. Excluded from our analysis is the mTPI-2 design, which operates in the same way as the Keyboard. Our results suggest that regardless of the choices of design parameters, the 3 + 3 design performs worse than the other ones, and BOIN and Keyboard have comparable performance to CRM. For any design, the performance varies with the choice of parameters. In particular, it improves as sample sizes increase, but the magnitude of benefit from increasing sample sizes varies substantially across scenarios. The impact of cohort size on design performances seems to have no clear direction. Therefore, BOIN and Keyboard designs are generally recommended due to their simplicity and good performance. With regard to choices of sample size and cohort size in designing a trial, it is recommend that simulations be performed for the particular clinical settings to aid decision making.

Parental Experiences of Child Participation in a Phase I Pediatric Oncology Clinical Trial: "We Don't Have Time to Waste"

Children with cancer are only eligible for phase I clinical trials (P1Ts) when no known curative therapy remains. However, the primary aims of P1Ts are not focused on directly benefiting participants. This raises ethical concerns that can be best evaluated by exploring the experiences of participants. An empirical phenomenology study, using an adapted Colaizzi method, was conducted of 11 parents' lived experiences of their child's participation in a pediatric oncology P1T. Study findings were that parents' experiences reflected what it meant to have a child fighting to survive high-risk cancer. Although elements specific to P1T participation were identified, more pervasive was parents' sense of running out of time to find an effective treatment and needing to use time they had with their child well. Even though some problems were identified, overall parents did not regret their child's P1T participation and would recommend P1Ts to other parents of children with cancer.

Enrollment in early-phase clinical trials in pediatric oncology: The experience at Institut Curie

BACKGROUND

The European Paediatric Regulation was introduced in 2007 to facilitate access to new medicines for children. Our study explored accessibility of early-phase trials in pediatric oncology, in line with the European Paediatric Regulation, to identify the reasons for not inviting patients to participate, parents' refusal, or inclusion failure.

PROCEDURE

We conducted a retrospective chart review at Institut Curie, Paris, for all pediatric patients whose cancer progressed despite known effective treatments between July 2010 and December 2013.

RESULTS

Out of 100 patients in the palliative phase, 52 received one or more invitations to participate in early-phase trials. Twenty parents declined the invitation, mainly prioritizing quality of life or fearing constraints. Fourteen inclusions failed despite parental approval, mostly due to rapid clinical deterioration. Five patients received no invitations because no early-phase trials were available. Major reasons for noninclusion in the 43 remaining patients were presence of exclusion criteria or other physical factors, preference for conventional treatment, constraints, psychological factors, and follow-up in another hospital after moving.

CONCLUSIONS

The Paediatric Regulation has led to increased availability of early-phase trials. Better timing of the proposal, designing less constraining early-phase trials, reducing waiting lists, and improving information for parents and children would facilitate pediatric access to new medicines.

Influence of early phase clinical trial enrollment on patterns of end-of-life care for children with advanced cancer

We conducted a retrospective cohort study of 125 pediatric oncology patients who died in 2010-2014 to explore how healthcare utilization, pediatric palliative care (PPC) receipt, and end-of-life care (EOLC) differed between patients enrolled in early phase clinical trials (EP) and those not enrolled (NEP). Baseline characteristics and healthcare utilization did not significantly differ between groups. EP patients received PPC consultation closer to death than NEP patients (median days before death = 58 [interquartile range = 16-84] vs. 85 [32-173]; P = 0.04). Our findings suggest that early phase trial enrollment does not substantially alter EOLC for children with advanced cancer but may contribute to later PPC engagement. Future studies should definitively assess the relationship between trial enrollment and PPC timing.

Outcome of children and adolescents with central nervous system tumors in phase I trials

Central nervous system (CNS) tumors are a leading cause of death in pediatric oncology. New drugs are desperately needed to improve survival. We evaluated the outcome of children and adolescents with CNS tumors participating in phase I trials within the Innovative Therapies for Children with Cancer (ITCC) consortium. Patients with solid tumors aged < 18 years at enrollment in their first dose-finding trial between 2000 and 2014 at eight ITCC centers were included retrospectively. Survival was evaluated using univariate/multivariate analyses. Overall, 114 patients were included (109 evaluable for efficacy). Median age was 10.2 years (range 1.0-17.9). Main diagnoses included: medulloblastoma/primitive neuroectodermal tumors (32.5%) and high-grade gliomas (23.7%). Complete/partial responses (CR/PR) were reported in 7.3% patients and stable disease (SD) in 23.9%. Performance status of 90-100%, school/work attendance, normal ALT/AST and CR/PR/SD correlated with better overall survival (OS) in the univariate analysis. No variables assessable at screening/enrollment were associated with OS in the multivariate analysis. Five patients (4.5%) were discontinued from study due to toxicity. No toxic deaths occurred. Median OS was 11.9 months with CR/PR, 14.5 months with SD and 3.7 months with progressive disease (p < 0.001). The enrollment of children and adolescents with CNS tumors in phase I trials is feasible, safe and offers potential benefit for the patients. Sustained disease stabilization has a promising role as a marker of anti-tumor activity in children with CNS tumors participating in phase I trials.

Medulloblastoma in children and adolescents: a systematic review of contemporary phase I and II clinical trials and biology update

Survival rates for patients with medulloblastoma have improved in the last decades but for those who relapse outcome is dismal and new approaches are needed. Emerging drugs have been tested in the last two decades within the context of phase I/II trials. In parallel, advances in genetic profiling have permitted to identify key molecular alterations for which new strategies are being developed. We performed a systematic review focused on the design and outcome of early-phase trials evaluating new agents in patients with relapsed medulloblastoma. PubMed, clinicaltrials.gov, and references from selected studies were screened to identify phase I/II studies with reported results between 2000 and 2015 including patients with medulloblastoma aged <18 years. A total of 718 studies were reviewed and 78 satisfied eligibility criteria. Of those, 69% were phase I; 31% phase II. Half evaluated conventional chemotherapeutics and 35% targeted agents. Overall, 662 patients with medulloblastoma/primitive neuroectodermal tumors were included. The study designs and the response assessments were heterogeneous, limiting the comparisons among trials and the correct identification of active drugs. Median (range) objective response rate (ORR) for patients with medulloblastoma in phase I/II studies was 0% (0-100) and 6.5% (0-50), respectively. Temozolomide containing regimens had a median ORR of 16.5% (0-100). Smoothened inhibitors trials had a median ORR of 8% (3-8). Novel drugs have shown limited activity against relapsed medulloblastoma. Temozolomide might serve as backbone for new combinations. Novel and more homogenous trial designs might facilitate the development of new drugs.

Voices of children and adolescents on phase 1 or phase 2 cancer trials: A new trial endpoint?

BACKGROUND

Pediatric participants on phase 1 or phase 2 clinical trials for incurable cancer are at risk of experiencing toxicities (adverse events [AEs]) related to trial participation. Multiple AEs are subjective; thus, the real impact of trial treatment cannot be known unless patient subjective reports are solicited.

METHODS

The authors assessed the feasibility and acceptability of soliciting symptom, function, and quality of life (QOL) reports from participants aged 8 to 18 years who were enrolled on phase 1/2 clinical trials at 4 cancer centers during the first course of chemotherapy. The authors also assessed the reliability and validity of 6 self-report Patient-Reported Outcomes Measurement Information System (PROMIS) pediatric measures and 4 open-ended interview questions at 2 time points (at the time of trial enrollment [T1] and 3 to 4 weeks later [T2]).

RESULTS

The enrollment rate of 75.9% (20 participants) exceeded the feasibility criterion, and missingness of measures by person, measure, and items at T1 and T2 were lower than the acceptability criteria. New QOL themes were limited to the impact of treatment on families and being away from home, family, and friends for treatment. All but one measure at T1 met the reliability criterion and all measures did so at T2. Validity support was limited however because as theorized, mobility decreased and fatigue increased as AEs increased.

CONCLUSIONS

Soliciting and documenting symptom, function, and QOL reports from patients aged 8 to 18 years who are enrolled on a phase 1/2 clinical trial is feasible and acceptable to participants, particularly when embedded in trials. Reliable and valid findings can result, making patient self-reported outcomes a possible new trial endpoint. Cancer 2017;123:3799-3806. © 2017 American Cancer Society.

Understanding Treatment Burden and Quality of Life Impact of Participating in an Early-Phase Pediatric Oncology Clinical Trial: A Pilot Study

PURPOSE

Early-phase clinical trials (EPTs) have led to new, more effective treatment options for children with cancer. Despite the extensive use of EPTs in pediatric oncology, little is known about parent and child experiences during EPT participation. The purposes of this pilot study were to assess the feasibility and preliminary results of having children with cancer and their parents complete measures of treatment burden and quality of life (QOL) concurrent with EPT participation.

METHODS

In this descriptive, longitudinal, pilot study, parents and children were followed for the first 60 days of an EPT. Feasibility was assessed by participant enrollment and retention and completion of measures. Measures completed included the following: demographic form (completed at baseline); Diary of Trial Experiences to capture treatment burden (completed ongoing); and PedsQL™ Quality of Life Inventories, Cancer Modules, and Family Impact Module (completed at baseline, post-first disease evaluation, and off-study). Data were analyzed using descriptive statistics.

RESULTS

Feasibility goals of enrollment, retention, and measure completion were partially met. Preliminary treatment burden and QOL results are provided.

CONCLUSIONS

While QOL assessments may provide insight into EPT experiences, future studies need to be conducted at multiple sites and enrollment goals must account for participant attrition.

A comparison of safety and efficacy of cytotoxic versus molecularly targeted drugs in pediatric phase I solid tumor oncology trials

BACKGROUND

Prior reviews of phase I pediatric oncology trials involving primarily cytotoxic agents have reported objective response rates (ORRs) and toxic death rates of 7.9-9.6% and 0.5%, respectively. These data may not reflect safety and efficacy in phase I trials of molecularly targeted (targeted) drugs.

METHODS

A systematic review of pediatric phase I solid tumor trials published in 1990-2013 was performed. The published reports were evaluated for patient characteristics, toxicity information, and response numbers.

RESULTS

A total of 143 phase I pediatric clinical trials enrolling 3,896 children involving 53 targeted and 48 cytotoxic drugs were identified. A meta-analysis demonstrated that the ORR is 2.1-fold higher with cytotoxic drugs (0.066 vs. 0.031 per subject; P = 0.007). By contrast, the pooled estimate of the stable disease rate (SDR) is similar for cytotoxic and targeted drugs (0.2 vs. 0.23 per subject; P = 0.27).  The pooled estimate of the dose-limiting toxicity rate is 1.8-fold larger with cytotoxic drugs (0.24 vs. 0.13 per subject; P = 0.0003). The hematologic grade 3-4 (G3/4) toxicity rate is 3.6-fold larger with cytotoxic drugs (0.43 vs. 0.12 per treatment course; P = 0.0001); however, the nonhematologic G3/4 toxicities and toxic deaths occur at similar rates for cytotoxic and targeted drugs.

CONCLUSIONS

In phase I pediatric solid tumor trials, ORRs were significantly higher for cytotoxic versus targeted agents. SDRs were similar in targeted and cytotoxic drug trials. Patients treated with cytotoxic agents were more likely to experience hematologic G3/4 toxicities than those patients receiving targeted drugs.

Response Assessment in Paediatric Phase I Trials According to RECIST Guidelines: Survival Outcomes, Patterns of Progression and Relevance of Changes in Tumour Measurements

INTRODUCTION

RECIST guidelines constitute the reference for radiological response assessment in most paediatric trials of anticancer agents. However, these criteria have not been validated in children. We evaluated the outcomes and patterns of progression of children/adolescents enrolled in phase I trials in two paediatric drug development units.

METHODS

Patients aged ≤21 assessed with RECIST (v1.0 or v1.1) were eligible. Clinico-radiological data were analysed using Mann-Whitney U and log-rank tests to correlate response categories and sum of longest diameters (SLD) with time-to-event variables and overall survival (OS).

RESULTS

Sixty-one patients (71 enrolments) were evaluated; median age: 12.7 years (range, 3.1-20.9). Overall, 7% achieved complete/partial response (n = 5) and 31% disease stabilisation (n = 22). Median (95% CI) OS (in months) was 29.1 (27.6-30.6) with complete/partial response, 8.9 (2.0-15.8) with stable disease and 2.8 (2.3-3.3) with disease progression (P < 0.001); 32.6% patients with measurable disease presented exclusive progression of existing non-target lesions and/or new lesions. The change in SLD at best response showed a linear correlation with duration of response (r = -0.605; P = 0.004) and time on trial (r = -0.61; P = 0.003), but the change in SLD at progression did not correlate with time to progression (r = -0.219; P = 0.206).

CONCLUSIONS

Response assessment according to RECIST correlated with OS in children/adolescents treated on phase I trials. The reduction in SLD at best response correlated with more prolonged responses. Tumour size did not constitute an optimal method to assess disease progression in one third of patients with measurable disease. Further refinement of current response assessment guidelines will enable the development of paediatric-specific radiological criteria.

Physician and nurse beliefs of phase 1 trials in pediatric oncology

BACKGROUND

In order to improve the survival of children with cancer, novel therapies must be identified. Promising agents are tested in phase 1 trials in order to identify appropriate dosing and describe toxicity in children. The identification and referral of candidate patients for phase 1 trials rely heavily on medical providers who must balance their own perceptions of phase 1 trials with the desires and willingness of the patient and his/her family.

OBJECTIVE

The goal of the present study was to evaluate and compare physician and nurse perceptions regarding the beliefs, expectations, and perceived benefits of phase 1 clinical trials.

METHODS

A survey consisting of 21 questions was sent to 419 physicians and nurses practicing pediatric oncology at 30 different institutions. With the exception of 10 demographic questions, items were either rank ordered or rated on 5-point Likert scales.

RESULTS

Ninety-four physicians and 122 nurses completed the online survey. Physicians and nurses differed in their knowledge of the goals and medical effects of phase 1 clinical trials.

CONCLUSIONS

Physicians and nurses hold positive beliefs regarding phase 1 clinical trials and support their role in the treatment of children with cancer. Education is necessary to increase nurses' knowledge of the goals and outcomes.

IMPLICATIONS FOR PRACTICE

These findings suggest that continued education of nurses as well as physicians about the goals, execution, and monitoring of phase 1 therapy would be worthwhile.

Family Refusal of Chemotherapy for Pediatric Cancer Patients: A National Survey of Oncologists

BACKGROUND

Refusal of therapy is ethically acceptable for competent adults. Practitioner opinions regarding refusal of therapy in pediatric cancer patients has not been widely studied. This is the largest survey of oncology practitioners assessing support for refusal of chemotherapy.

PROCEDURE

Pediatric oncology nurses/physicians were asked: "As their provider I would support refusal of chemotherapy by a family," with the following options: "Never support refusal," "Always support refusal," or "Support for refusal would depend on cure rate, age, or both." Variables assessed were: age (0 to 7, 8 to 13, 14 to 17 y) and cure rate (0% to 33%, 34% to 66%, 67% to 100%).

RESULTS

A total of 957 practitioners responded. Fifty-six percent, 31%, and 0.2%, respectively, stated their support of chemotherapy refusal depended on "age and cure rate," "cure rate alone," or "age alone." Two percent and 11% indicated they would "always" or "never" support refusal, respectively. For a "modest" or "good" cure rate, support for refusal was <20%, whereas for a "poor" cure rate, the majority would support a family's refusal (53% to 78% age dependent). Within each cure rate, respondents were more likely to support refusal for older patients (P<0.001).

CONCLUSIONS

The majority of practitioners surveyed viewed parental refusal of chemotherapy for children with a moderate or good expected cure rate as unacceptable, but were more accepting of refusal with a poor prognosis, especially for teenagers.

Does phase 1 trial enrollment preclude quality end-of-life care? Phase 1 trial enrollment and end-of-life care characteristics in children with cancer

BACKGROUND

End-of-life care (EOLC) discussions and treatment-related decisions, including phase 1 trial enrollment, in patients with incurable disease are complex and can influence the quality of EOLC received. The current study was conducted in pediatric oncology patients to determine whether end-of-life characteristics differed between those who were and were not enrolled in a phase 1 trial.

METHODS

The authors reviewed the medical records of 380 pediatric oncology patients (aged <22 years at the time of death) who died during a 3.5-year period. Of these, 103 patients with hematologic malignancies were excluded. A total of 277 patients with a diagnosis of a brain tumor or other solid tumor malignancy were divided into 2 groups based on phase 1 trial enrollment: a phase 1 cohort (PIC; 120 patients) and a non-phase 1 cohort (NPIC; 157 patients). The EOLC characteristics of these 2 cohorts were compared using regression analysis and chi-square testing.

RESULTS

A comparison of patients in the PIC and NPIC revealed no significant differences in either demographic characteristics (including sex, race, religious affiliation, referral origin, diagnosis, or age at diagnosis, with the exception of age at the time of death [P =.03]) or in EOLC indices (such as use or timing of do not attempt resuscitation orders, hospice use or length of stay, forgoing life-sustaining therapies, location of death, time from first EOLC discussion to death, and total number of EOLC discussions).

CONCLUSIONS

The results of the current study of a large cohort of deceased pediatric cancer patients indicate that enrollment on a phase 1 trial does not affect EOLC characteristics, suggesting that quality EOLC can be delivered regardless of phase 1 trial participation.

Patients in pediatric phase I and early phase II clinical oncology trials at Gustave Roussy: a 13-year center experience

In the European Union, the pediatric medicines regulation in 2007 modified significantly the access to new agents in pediatric oncology. Early oncology trials are still thought to be associated with limited benefit and substantial risk. We report the characteristics and outcome of patients below 21 years enrolled in investigational trials in the Pediatric and Adolescent Department at Gustave Roussy between January 2000 and December 2012. A total of 235 patients (median age, 10.4 [0.8 to 20.7] y) were included in 26 trials (16 cytotoxic and 10 targeted agents) for a total of 260 inclusions. A total of 117 patients (50%) had brain tumors and 68 (29%) had various soft tissue and bone sarcoma. Thirteen of the 106 patients in a phase I trial experienced dose-limiting toxicity. Main severe toxicity was hematologic; none had toxic death. Grade 3 to 4 toxicities were associated with combination trials, cytotoxic agent, and at least 1 previous line of therapy. Thirty patients (12%) had objective response and 42 (16%) had stable disease for >4 months. Median overall survival was 9.0 months (95% CI, 7.5-10.5) and 73% of patients received further anticancer treatment. Phase I to II pediatric oncology trials are safe, associated with clinical benefit, and can be successfully integrated in current relapse strategies.

Clinical characteristics and outcomes of pediatric oncology patients with aggressive biology enrolled in phase I clinical trials designed for adults: the university of Texas MD anderson cancer center experience

Background

Children (patients ≤ 18 years of age) are not usually included on pharmaceutical industry sponsored Phase I trials.

Methods

We reviewed the medical records of 40 patients ≤ 18 years treated in ≥ 1 phase I trial at MD Anderson.

Results

The median OS was 8.5 months (95% CI, 5.5-13.2 months). In the multivariate analysis, age ≥15 only predicted increased OS (P = 0.0065), and >3 prior therapies (P = 0.053) predicted decreased OS. The median PFS was 2.8 months (95% CI, 2.3-4.1 months). In the multivariate analysis, independent factors that predicted increased PFS were age ≥15 years (P < 0.001) and prior radiation therapy (P = 0.049); performance status >1 (P < 0.001) and >3 prior therapies (P = 0.002) predicted decreased PFS. RMH score ≥ 2 and MDACC score ≥ 3 were associated with decreased median OS (P = 0.029 and P = 0.031 respectively).

Conclusions

It is feasible to conduct phase I studies in pediatric patients based on adult protocols. In the era of targeted therapy more trials should allow pediatric patients earlier in the drug development especially if deemed safe in adults in early phase trials.

Translational Relevance

Most pharmaceutical industry sponsored trials exclude patients less than 18 years in phase I clinical trials. Even in the era of targeted therapy pediatric patients usually have to wait for most phases of trials to be completed in adults before being allowed to enroll in clinical trials of new therapies, even in the advanced metastatic and relapsed setting. Some investigator initiated phase 1 trials of combinations of US FDA approved agents allow patients less than 18 years. We report the preliminary analyses of the outcomes of pediatric patients enrolled in phase I studies initially designed for adults, but allowing for enrollment of patients under 18.

Parent perspectives on decisions to participate in a phase I hepatocyte transplant trial

We examined factors that affect decision-making for families presented with a phase I clinical trial of hepatocyte transplant as a potential alternative to liver transplant for their children among two groups: (i) families who were actually offered enrollment in the hepatocyte trial and; (ii) families whose children had liver transplants before the trial was available. We conducted semi-structured interviews about actual and hypothetical decision-making regarding trial participation and used grounded theory analysis to identify common themes. The most common motivator for participation was decline in the child's health. The most common deterrent was lack of data from prior hepatocyte transplants, particularly when compared with data available about liver transplant. Interviewees' point of comparison for evaluating relative benefits and risks of hepatocyte transplant oscillated between the alternative of doing nothing while waiting for a liver (the relevant alternative) vs. the alternative of getting a liver. These results suggest that families' reluctance to participate may result from misconceptions about severity of the child's disease, underestimating risks of liver transplant, or confusion about the role of hepatocyte transplant in the treatment pathway. Clarification of available treatment alternatives and associated risks as part of informed consent may improve the quality of decision-making regarding trial enrollment.

Physician perceptions and beliefs of phase I trials in pediatric oncology

The identification and referral of candidate patients for phase I trials relies heavily on pediatric oncologists who must balance their own perceptions of phase I trials with the desires of the patient and his/her family. A survey was sent to 419 physicians practicing pediatric oncology at 30 different institutions. Results indicated significant differences between physicians who practiced at institutions that participated in phase I consortia versus those who did not. The findings of the survey may be used to enhance the design and execution of phase I trials and to educate oncologists about the goals of phase I trials.

Automated volumetric growth plate measurement using magnetic resonance imaging for monitoring skeletal toxicity in children treated on investigational drug trials

PURPOSE

Targeted anticancer agents have been reported to have side effects on the skeletal system such as thickening of the epiphyseal growth plate in preclinical models of juvenile, but not mature, animals. Careful evaluation of skeletal toxicity in the clinical development of targeted therapies for children is required. We validated a novel method to measure the growth plate volume using MRI.

EXPERIMENTAL DESIGN

A semiautomated method of volumetric growth plate measurement was developed on the basis of the differences of pixel intensity of the growth plate from surrounding bone on T(1) sagittal MRI. Two observers measured the femoral growth plate volume and thickness on three different days using 20 pediatric knee MRIs obtained at the NIH. Five subjects had two knee MRIs obtained on the same day to evaluate intrasubject reproducibility.

RESULTS

Volumetric analysis showed low intraobserver variability, with the coefficient of variation for the two observers ranging from 0.2% to 6.1%. Interobserver correlation was 0.99, and good concordance was shown with a mean volume difference of -1.8 mm(3). One-dimensional measurements had poorer intra and interobserver consistency. No statistically significant differences in volumetric measurements were observed between the two scans done on the same day in five subjects (P = 0.5).

CONCLUSIONS

MRI volumetric growth plate measurement is a reproducible and sensitive method to evaluate meaningful growth plate volume changes over time. This tool, along with close monitoring of height and laboratory evaluations for bone metabolism, may be used to evaluate potential bone and growth toxicities of children enrolled in trials of investigational drugs.

Phase 1 trial and pharmacokinetic study of the farnesyl transferase inhibitor tipifarnib in children and adolescents with refractory leukemias: a report from the Children's Oncology Group

BACKGROUND

The objectives of this trial were to define the toxicity profile, dose, pharmacokinetics, and pharmacodynamics of the farnesyl transferase (FTase) inhibitor, tipifarnib, in children and adolescents with hematological malignancies.

PROCEDURE

Tipifarnib was administered twice daily for 21 days, repeated every 28 days starting at a dose of 300 mg/m(2) /dose. Pharmacokinetic sampling was performed for 36 hr after the first dose and leukemic blasts were collected pre-treatment and at steady state for determination of FTase activity.

RESULTS

Of 29 patients enrolled, 18 were fully evaluable for toxicity, and 23 for response; 26 had pharmacokinetic and pharmacodynamic sampling. The recommended dose is 300 mg/m(2) /dose and toxicities included skin rash, mucositis, nausea, vomiting, and diarrhea. Neurotoxicity, which was dose-limiting in adults at doses exceeding 600 mg/dose, was infrequent and mild. The plasma pharmacokinetics of tipifarnib were highly variable but comparable to adults with acute leukemia and children with solid tumors. The median apparent clearance of tipifarnib was 630 ml/min/m(2) and the median half-life was 4.7 hr. At steady state on 300 mg/m(2) /dose, FTase activity was inhibited by 82% in leukemic blasts. No objective responses were observed.

CONCLUSIONS

Oral tipifarnib is well tolerated in children with leukemia on a twice daily for 2 days schedule at 300 mg/m(2) /dose.

Characteristics of children enrolled in treatment trials for NF1-related plexiform neurofibromas

OBJECTIVE

To describe the characteristics of children enrolled in treatment trials for neurofibromatosis type 1 (NF1)-related plexiform neurofibroma (PN), PN tumor burden, PN-related complications, and treatment outcomes and to highlight the differences between characteristics of children with NF1 vs children with cancers entered on early phase drug trials.

METHODS

Pre-enrollment characteristics and complications of PN were retrospectively analyzed in a cohort of 59 children with NF1-related PN treated on 1 of 7 clinical trials at the NIH between 1996 and 2007. Outcome was analyzed in a subset of 19 patients enrolled in phase I trials. Comparisons to children with cancer were made from a similar analysis performed recently.

RESULTS

The median age at enrollment was 8 years. The median PN volume was 555 mL. Most patients had no prior chemotherapy or radiation, but nearly half had previous surgery for PN. PN-associated complications and NF1 manifestations were common, including pain (53%), other tumors (18%), and hypertension (8%). Investigational drug therapy was well tolerated. A median of 10 treatment cycles was administered. Patients with NF1-related PN were younger, had better performance score, had less prior therapy, and remained on study longer than cancer patients.

CONCLUSIONS

Children with NF1-related plexiform neurofibroma (PN) enrolled in clinical trials had large tumors with substantial morbidity. Clinical trials in these children provide information about drug tolerance, cumulative toxicity, and pharmacokinetics in a younger population than early phase pediatric cancer trials. This report may aid in the evaluation of the applicability of traditional pediatric cancer trial designs and endpoints for NF1-related PN.