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Brigatinib tablet or age-appropriate formulation (AAF), orally once daily in 28-day Cycles with reference to adult dose of 90 mg in Week 1 and 180 mg starting in Week 2 based on participant's weight as dose level 1. Participants could receive dose level 2 based on safety and tolerability of dose level 1 in dose escalation phase (Ph).

Brigatinib recommended phase 2 dose (RP2D) determined during phase 1, tablet or AAF orally QD in participants with Unresectable/ Recurrent ALK+ IMT for up to 2 years in dose expansion phase.

Brigatinib RP2D determined during phase 1, tablet or AAF orally QD in participants with Relapsed/ Refractory ALK+ ALCL for up to 2 years in dose expansion phase.

Brigatinib

Brigatinib age-appropriate formulation (AAF)

Brigatinib AAF

Medical Director Clinical Science

The purpose of this study is to estimate the maximum tolerated dose (MTD)/ recommended phase 2 dose (RP2D) regimen and characterize the pharmacokinetics (PK) of brigatinib monotherapy (film-coated tablets and age-appropriate formulation \[AAF\]) administered orally once daily (QD) in pediatric and young adult participants in Phase 1 and to define the efficacy of brigatinib administered as monotherapy within the disease-specific expansion arms (unresectable/recurrent anaplastic lymphoma kinase positive (ALK+) inflammatory myofibroblastic tumor (IMT); relapsed/refractory ALK+ anaplastic large cell lymphoma (ALCL) in Phase 2.

The drug being tested in this study is called Brigatinib. Brigatinib is being tested to treat people who have Anaplastic Large Cell Lymphoma, Inflammatory Myofibroblastic Tumors or other solid tumours.

The study will enroll approximately 61 patients. Participants will be assigned to the following arm group to receive brigatinib:

* Phase 1 (Dose Escalation): Brigatinib Dose Level 1 and Dose Level 2 (based on safety and tolerability)
* Phase 2 (Dose Expansion): Unresectable/ Recurrent ALK+ IMT
* Phase 2 (Dose Expansion): Relapsed/ Refractory ALK+ ALCL

All participants will be administered brigatinib orally once daily in 28-day Cycles. Participants will receive fixed doses of brigatinib based on weight ranges. The starting doses in Phase 1 (Dose Level 1) are expected to provide systemic exposures of brigatinib in pediatric participants comparable to those achieved in adults receiving the recommended clinical dose of 90 mg once daily for 7 days followed by 180 mg once daily. One additional dose level (Dose Level 2) is planned in Phase 1 if the initial dose level is tolerated. This subsequent dose level is expected to provide systemic exposures of brigatinib in pediatric participants comparable to those achieved in adults receiving 90 mg once daily for 7 days followed by 240 mg once daily (the highest acceptably tolerated dose in adults). In Phase 2, brigatinib will be administered at the RP2D determined during Phase 1.

This multi-centre trial will be conducted worldwide. The overall time to participate in this study is approximately 36 months. Participants will make multiple visits to the clinic and will be contacted by telephone OR a final visit after receiving their last dose of brigatinib for a follow-up assessment.

Pharmacokinetics, Safety, and Efficacy of Brigatinib Monotherapy in Pediatric and Young Adult Participants With ALK+ Anaplastic Large Cell Lymphoma, Inflammatory Myofibroblastic Tumors or Other Solid Tumors

An Open-Label, Phase 1/2 Dose Escalation and Expansion Trial to Evaluate the Pharmacokinetics, Safety, and Efficacy of Brigatinib as Monotherapy in Pediatric and Young Adult Patients With ALK+ Anaplastic Large Cell Lymphoma, Inflammatory Myofibroblastic Tumors or Other Solid Tumors

Takeda makes patient-level, de-identified data sets and associated documents available for all interventional studies after applicable marketing approvals and commercial availability have been received (or program is completely terminated), an opportunity for the primary publication of the research and final report development has been allowed, and other criteria have been met as set forth in Takeda's Data Sharing Policy (see www.TakedaClinicalTrials.com for details). To obtain access, researchers must submit a legitimate academic research proposal for adjudication by an independent review panel, who will review the scientific merit of the research and the requestor's qualifications and conflict of interest that can result in potential bias. Once approved, qualified researchers who sign a data sharing agreement are provided access to these data in a secure research environment.

MTD will be highest dose of brigatinib, at which \<=1 of 6 participants would experience a dose-limiting toxicity (DLT). DLT is defined using National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE), version 5.0, as: Non-Haematological events possibly or definitively brigatinib related grade ≥3 AE except fatigue, nausea, vomiting lasting for \<48 hours and nonhematologic laboratory abnormalities that resolve to Grade 1 or baseline within 7 days after study drug modification and/or supportive care; hematologic toxicities (except in participants with bone marrow involvement or MAS) as: Grade 4 neutropenia lasting longer than 7 days with supportive care, Grade ≥3 febrile neutropenia requiring antibiotics, Grade 3 platelet count (\<50,000-25,000/μL) with bleeding requiring transfusion, Grade 4 platelet count (\<25,000/μL) at any time, any delay or interruption of therapy of ≥2 weeks due to suspected treatment-related hematologic toxicities.

The RP2D is the maximum tolerated dose (MTD) or less. MTD was highest dose of Brigatinib, at which \<=1 of 6 participants experienced DLT.

ORR is defined as the percentage of participants with tumor size reduction of a predefined amount and for a minimum time period. ORR is determined by radiological tests and investigator assessment. ORR for unresectable/recurrent ALK+IMT participants will be the achievement of a Complete Response (CR) or Partial Response (PR) as assessed by Response Evaluation Criteria in Solid Tumors (RECIST) 1.1. Per RECIST 1.1, CR is defined as disappearance of all target lesions; PR is defined as atleast 30% decrease in sum of diameters (SoD) of target lesions. Per International Pediatric Non-Hodgkin Lymphoma (IPNHL) response criteria, CR is defined as disappearance of all residual disease and tumor lesions; PR is defined as 50% decrease in sum of product of greatest perpendicular diameters (SPD) of lymphoma cells.

DLT is defined using National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE), version 5.0, as: Non-Haematological events possibly or definitively brigatinib related grade ≥3 AE except fatigue, nausea, vomiting lasting for \<48 hours and nonhematologic laboratory abnormalities that resolve to Grade 1 or baseline within 7 days after study drug modification and/or supportive care; hematologic toxicities (except in participants with bone marrow involvement or MAS) as: Grade 4 neutropenia lasting longer than 7 days with supportive care, Grade ≥3 febrile neutropenia requiring antibiotics, Grade 3 platelet count (\<50,000-25,000/μL) with bleeding requiring transfusion, Grade 4 platelet count (\<25,000/μL) at any time, any delay or interruption of therapy of ≥2 weeks due to suspected treatment-related hematologic toxicities.

An AE is any untoward medical occurrence in a participant administered a medicinal investigational drug. The untoward medical occurrence does not necessarily have to have a causal relationship with treatment. A SAE is any AE that results in death, is life-threatening, requires inpatient hospitalization or prolongation of an existing hospitalization, results in significant disability or incapacity, is a congenital anomaly/birth defect or is a medically important event.

Acceptability is defined as the overall ability of the participant to use the medicine as intended. Acceptability and palatability (taste and smell) will be assessed using a 5-point facial hedonic scale, where 1 indicates 'bad', and 5 indicates 'good'.

DOR is defined as the time from the initial assessment of CR response until subsequent disease progression or relapse. Per RECIST 1.1, CR is defined as disappearance of all target lesions and per IPNHL, response criteria CR is defined as disappearance of all residual disease and tumor lesions. Disease progression as per RECIST 1.1, is defined as at least a 20% increase in the sum of the longest diameter (LD) of target lesions, taking as reference the smallest sum LD recorded since the treatment started or the appearance of one or more new lesions. Disease progression as per IPNHL response criteria, is defined as development of new morphologic evidence of disease in bone marrow.

Time from the start of treatment with brigatinib to the first objective tumor response observed for participants who achieved a CR or PR. Per RECIST 1.1, CR is defined as disappearance of all target lesions; PR is defined as atleast 30% decrease in sum of diameters (SoD) of target lesions. Per IPNHL response criteria, CR is defined as disappearance of all residual disease and tumor lesions; PR is defined as 50% decrease in sum of product of greatest perpendicular diameters (SPD) of lymphoma cells.

DCR is defined as the percentage of participants who are confirmed to have achieved CR or PR or have a best overall response of stable disease (SD). Per RECIST 1.1, CR is defined as disappearance of all target lesions; PR is defined as atleast 30% decrease in sum of diameters (SoD) of target lesions. SD is defined as neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for progressive disease (PD). PD is defined as at least a 20% increase in the sum of the longest diameter (LD) of target lesions, taking as reference the smallest sum LD recorded since the treatment started or the appearance of one or more new lesions.

PFS is defined as the time from the date of first dose to the date of PD per RECIST v1.1, or the date of death due to any cause, whichever occurs first. PD is defined as at least a 20% increase in the sum of the longest diameter (LD) of target lesions, taking as reference the smallest sum LD recorded since the treatment started or the appearance of one or more new lesions.

EFS is defined as the time from the date of first dose to any treatment failure including disease progression, or discontinuation of treatment for any reason (eg, disease progression, toxicity, patient preference, initiation of new treatment without documented progression, or death). Participants without any treatment failure events will be censored at last known alive date before data cutoff date.

Overall survival in months is defined as the time from the date of first dose to the date of death due to any cause. Participants without documentation of death at the time of analysis will be censored at the date last known to be alive.

Spots Global Cancer Trial Database for anaplastic lymphoma kinase positive (alk +) anaplastic large cell lymphoma