Publications by authors named "Christian Michel Zwaan"

Infections lead to substantial morbidity during treatment of acute lymphoblastic leukemia (ALL) in which the adaptive immune system gets severely affected, leading to declining serum immunoglobulin levels. The aim of this trial was to investigate whether intravenous immunoglobulin (IVIG) prophylaxis in pediatric patients with ALL prevents admissions for fever. This randomized controlled trial was a subtrial of the national Dutch multicenter ALL study.

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The prognosis of children with acute myeloid leukemia (AML) has improved incrementally over the last few decades. However, at relapse, overall survival (OS) is approximately 40-50% and is even lower for patients with chemo-refractory disease. Effective and less toxic therapies are urgently needed for these children.

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The efficacy and safety of nilotinib in pediatric patients with imatinib/dasatinib resistant/intolerant (R/I) or newly diagnosed (ND) Philadelphia chromosome-positive (Ph+) chronic myeloid leukemia in chronic phase (CML-CP) was demonstrated in the phase 2, open-label DIALOG study. In this final analysis, long-term efficacy and safety are presented for patients who completed 66 cycles (of 28 days) of treatment with nilotinib (230 mg/m2 twice daily) or discontinued early. Overall, 59 patients were enrolled and 58 were treated (R/I, n = 33; ND, n = 25; median time on treatment: 60.

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Purpose: There is an increasing need to evaluate innovative drugs for childhood cancer using combination strategies. Strong biological rationale and clinical experience suggest that multiple agents will be more efficacious than monotherapy for most diseases and may overcome resistance mechanisms and increase synergy. The process to evaluate these combination trials needs to maximize efficiency and should be agreed by all stakeholders.

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Hematopoietic stem cell transplantation (HSCT) is often the only curative treatment option for patients suffering from various types of malignant diseases and some non-cancerous conditions. Nevertheless, it is associated with a high risk of complications leading to transplant-related mortality and long-term morbidity. An increasing number of therapeutic and prevention strategies have been developed over the last few years to tackle the complications arising in patients receiving an HSCT.

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Treatment of chronic myeloid leukemia has improved significantly with the introduction of tyrosine kinase inhibitors (TKIs), and treatment guidelines based on numerous clinical trials are available for chronic phase disease. However for CML in the blast phase (CML-BP), prognosis remains poor and treatment options are much more limited. The spectrum of treatment strategies for children and adolescents with CML-BP has largely evolved empirically and includes treatment principles derived from adult CML-BP and pediatric acute leukemia.

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Article Synopsis
  • - Chimeric antigen receptor T cells targeting CD19 (CART-19) have been effective in treating relapsed/refractory B-Cell precursor acute lymphoblastic leukemia (BCP-ALL), with most patients achieving complete remission after treatment.
  • - A study analyzed 39 young patients who received the anti-CD22 drug inotuzumab ozogamicin (InO) either before or after T-cell apheresis, finding no significant differences in treatment outcomes based on the timing of InO administration.
  • - Overall survival rates and event-free survival rates after CART-19 infusion were comparable for patients with and without prior InO exposure, suggesting prior use of InO does not negatively impact the effectiveness of CART
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Article Synopsis
  • * Researchers used a drug-repurposing strategy to test 4,191 FDA-approved compounds on KMT2A-rearranged infant ALL samples to find effective treatments with lower toxicity to non-leukemic bone marrow.
  • * The study identified several drug classes that activate p53 signaling, which is crucial for inducing cell death in leukemia cells, suggesting drug-induced p53 activation could be key for effective treatment strategies.
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The seventh multi-stakeholder Paediatric Strategy Forum focused on chimeric antigen receptor (CAR) T-cells for children and adolescents with cancer. The development of CAR T-cells for patients with haematological malignancies, especially B-cell precursor acute lymphoblastic leukaemia (BCP-ALL), has been spectacular. However, currently, there are scientific, clinical and logistical challenges for use of CAR T-cells in BCP-ALL and other paediatric malignancies, particularly in acute myeloid leukaemia (AML), lymphomas and solid tumours.

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Immunotherapeutic agents may be an attractive option to further improve outcomes and to reduce treatment-related toxicity for pediatric AML. While improvements in outcome have been observed with immunotherapy in many cancer types, immunotherapy development and implementation into patient care for both adult and pediatric AML has been hampered by an incomplete understanding of the bone marrow environment and a paucity of tumor-specific antigens. Since only a minority of patients respond in most immunotherapy trials across different cancer types, it will be crucial to understand which children with AML are likely to respond to or may benefit from immunotherapies.

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Background: This is the first national study on trends in cancer survival and mortality for children and young adolescents in the Netherlands including unique information on stage at diagnosis.

Methods: All neoplasms in patients <18 years, diagnosed between 1990 and 2015 (N = 14,060), were derived from the Netherlands Cancer Registry. Cohort and period survival analyses were used to estimate observed survival (OS).

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The phase 2, open-label study (DIALOG) of nilotinib in pediatric patients with Philadelphia chromosome-positive chronic myelogenous leukemia (CML) met its coprimary end points, showing sustained nilotinib efficacy in patients with newly diagnosed (ND) or imatinib/dasatinib resistant/intolerant (R/I) CML. This update assessed growth and safety profiles in patients who had completed ≥48, 28-day treatment cycles of nilotinib 230 mg/m2 twice daily, or previously discontinued the study. Height was assessed regularly and reported using standard deviation scores (SDSs) based on World Health Organization growth charts.

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No data on inotuzumab ozogamicin (InO) in infant acute lymphoblastic leukaemia (ALL) have been published to date. We collected data internationally on infants/young children (<3 years) with ALL treated with InO. Fifteen patients (median 4.

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This phase 1 study investigated the recommended phase 2 dose (RP2D) of inotuzumab ozogamicin (InO), a CD22-directed antibody-drug conjugate, in pediatric patients with multiple relapsed/refractory (R/R) CD22+ acute lymphoblastic leukemia (ALL). Patients (age ≥1 year or <18 years) received 3 doses of InO (days 1, 8, and 15) per course. Dose escalation was based on dose-limiting toxicities (DLTs) during course 1.

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Chronic myeloid leukemia (CML) is rare in children and accounts for ≤15% of all myeloid leukemia cases. When we initiated this study with nilotinib, imatinib was the only tyrosine kinase inhibitor indicated for pediatric patients with Philadelphia chromosome-positive (Ph+) CML in chronic phase (CP); alternative treatment options were needed, particularly for patients who developed resistance or intolerance (R/I) to imatinib. This phase 2 study enrolled pediatric patients with either Ph+ CML-CP R/I to imatinib or dasatinib or newly diagnosed Ph+ CML-CP.

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Background: This was a subgroup analysis of age group, dexamethasone use, and very highly emetogenic chemotherapy (VHEC) use from a randomised, multicentre, double-blind, Phase 3 study of oral aprepitant in paediatric subjects.

Methods: Subjects aged 6 months to 17 years scheduled to receive chemotherapeutic agents associated with at least moderate risk for emesis were randomly assigned to receive either aprepitant plus ondansetron (aprepitant regimen) or placebo plus ondansetron (control regimen); both could be administered with or without dexamethasone. This secondary analysis evaluated subjects stratified by pre-specified age groups, dexamethasone use, and VHEC use.

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This trial explored the efficacy of re-induction chemotherapy including bortezomib in paediatric relapsed/refractory acute lymphoblastic leukaemia. Patients were randomized 1:1 to bortezomib (1.3 mg/m /dose) administered early or late to a dexamethasone and vincristine backbone.

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Introduction: Pediatric oncology is often considered as a field in which research and care are highly integrated. We believe that this integration can be seen as a so-called Learning Health System, a system in which research is considered an important means to continuously improve the practice of care. In order to substantiate our assumption of pediatric oncology as an LHS, we will analyze so-called "best available treatment protocols.

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We present the molecular landscape of pediatric acute myeloid leukemia (AML) and characterize nearly 1,000 participants in Children's Oncology Group (COG) AML trials. The COG-National Cancer Institute (NCI) TARGET AML initiative assessed cases by whole-genome, targeted DNA, mRNA and microRNA sequencing and CpG methylation profiling. Validated DNA variants corresponded to diverse, infrequent mutations, with fewer than 40 genes mutated in >2% of cases.

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Article Synopsis
  • Abnormalities in pediatric B-cell precursor acute lymphoblastic leukemia (BCP-ALL) may present targets for precision medicine, as the study evaluates mutations and translocations in primary BCP-ALL cells alongside the effectiveness of JAK inhibitors.
  • The researchers found that mutations predominantly appeared in poorer prognosis subtypes, and specific translocations were limited to certain cases; both Momelotinib and ruxolitinib showed cytotoxic effects, but their success was affected by other factors.
  • Notably, JAK inhibitors led to resistance due to mutation in other survival pathways and increased JAK2 signaling after stopping treatment, indicating a need for better optimization before clinical use in pediatric BCP-ALL.
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Nelarabine is an antineoplastic agent approved for the treatment of relapsed/refractory T-lineage acute lymphoblastic leukaemia (T-ALL) or T-lineage acute lymphoblastic lymphoma (T-LBL). The purpose of this phase 4, multicentre, single-arm, observational, open-label trial was to provide additional data on the safety and efficacy of nelarabine under licensed conditions of use in children and young adults ≤21 years of age. Patients (N = 28) had a mean ± standard deviation age of 11·5 ± 4·6 years; 71% were male and 61% had a diagnosis of T-ALL.

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