Medulloblastoma, Childhood Clinical Trial
Official title:
PBTC-053: A Pediatric Brain Tumor Consortium Phase I/ II and Surgical Study of CX-4945 in Patients With Recurrent SHH Medulloblastoma
This is a multi center, Phase I, Phase II and surgical study of the CX-4945 drug (silmitasertib sodium) for patients with recurrent SHH (Sonic Hedgehog) medulloblastoma
PRIMARY OBJECTIVES: I. To estimate the maximum tolerated dose (MTD) and/or the recommended phase II dose (RP2D) of CX-4945 administered orally daily to skeletally-immature children with recurrent SHH (sonic hedgehog) medulloblastoma (Phase I) II. To describe the toxicity profile and define the dose-limiting toxicities (DLTs) of CX-4945 in skeletally-immature children with recurrent SHH (sonic hedgehog) medulloblastoma. (Phase I) III. To characterize the pharmacokinetics of CX-4945 administered orally daily to skeletally-immature children with recurrent SHH (sonic hedgehog) medulloblastoma. (Phase I) IV. To characterize the concentrations of CX-4945 in tumor after administration of CX-4945 and surgical resection (Surgical Study). V. To establish the safety and characterize the toxicity of 1000mg BID continuous dosing of CX-4945 in skeletally-mature patients with recurrent SHH medulloblastoma (Phase II). VI. To estimate the objective response rate associated with CX-4945 in skeletally-mature patients with recurrent SHH medulloblastoma SECONDARY OBJECTIVES: I. To document preliminary antitumor activity of CX-4945 in skeletally-immature children with recurrent SHH medulloblastoma (Phase I). II. To perform a genomic analysis within the confines of a Phase I study to investigate correlation between response to treatment and the presence of specific genomic alterations. and/or specific subgroups of disease (Phase I). III. To explore the ability of CX-4945 at the MTD/ RP2D to inhibit CK2-mediated signaling in tumor (Surgical Study). IV. To characterize the pharmacokinetics of CX-4945 in skeletally-mature patients with recurrent SHH medulloblastoma (Phase II). V. To perform a genomic analysis within the confines of a Phase II study to investigate correlation between response to treatment and the presence of specific genomic alterations and/or specific subgroups of disease (Phase II). OUTLINE: Phase I component is a dose-escalation study. The Phase II component is to establish the safety of 1000mg BID given continuously. The study will open with a safety cohort of 3 subjects who are considered skeletally-mature. The initial 3 subjects will be administered CX-4945 twice a day at the adult RP2D of 1000 mg BID or at its BSA adjusted equivalent; however, the dose will be given continuously. If there are not excessive toxicities in this cohort, the study will proceed following the Phase II design for subjects who are skeletally-mature. Following the safety lead in, the Phase 1 component of this trial will be initiated. Skeletally-immature children with refractory or recurrent medulloblastoma of the SHH subgroup, will be administered CX-4945 twice a day on a continuous basis at a starting dose of 600mg/m2 BID which corresponds approximately to the BSA adjusted recommended Phase 2 dose (RP2D) of 1000mg. The Phase 1 study will escalate doses to determine the maximum tolerated dose skeletally-immature children. The surgical study will be initiated after the first 3 patients in the skeletally-mature cohort are treated for initial assessment of safety and did not experience excessive toxicity. Skeletally-mature subjects with recurrent or refractory SHH medulloblastoma will be eligible as soon the surgical study is initiated and will receive drug at 1000mg BID or its BSA adjusted equivalent depending upon age and BSA. Skeletally-immature subjects will only be eligible to enroll on the surgical trial once the MTD is defined in the Phase 1 component and will receive drug at the established MTD for this cohort. After completion of study treatment, patients are followed up to 2 years. ;
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