Terminated Early

This trial will evaluate whether luveltamab tazevibulin is well tolerated and active against a rare form of AML carrying a particular genetic abnormality called CBFA2T3::GLIS2 that arises in infants and children. To be treated in this trial children must have a leukemia which did not respond or recurred after prior treatment. Luveltamab tazevibulin is an antibody-drug conjugate, which brings tazevibulin, an anticancer drug, to a molecule called FOLR1, present on the surface of CBFA2T3::GLIS2 AML cells.

This is a registrational international, multicenter, two-part open label Phase 1/2 trial in an extremely rare pediatric disease (around 17 new patients a year in US and 10 in EU). Part 1 randomizes subjects 1:1 to one of two luveltamab tazevibulin dose cohorts (1a and 1b). Part 2 further evaluates the safety and the efficacy of the selected dose. Subjects who achieve complete remission after two cycles of treatment may continue luveltamab tazevibulin as monotherapy, while non-responders at PI discretion may add luveltamab tazevibulin with standard of care (SOC) AML treatments. Luveltamab tazevibulin is given IV every two week as monotherapy and every 4 weeks when given with chemotherapy.

Inclusion Criteria:

• AML with CBFA2T3::GLIS2 gene fusion centrally confirmed
• Refractory or relapsed disease with ≥ 5% bone marrow involvement with leukemic blasts by morphology
• Age < 12 years.
• Lansky performance of ≥ 50
• Adequate organ functions

Exclusion Criteria:

• Active central nervous system (CNS) disease (CNS3)
• Pre-existing clinically significant corneal disorders or constitutional diseases associated with an increased risk of AML treatment toxicities
• Active or uncontrolled infections or other active severe intercurrent illnesses,
• Prior treatment with a FOLR1- targeting ADCs or with ADCs that contain a tubulin inhibitor
• History of allogeneic hematopoietic stem cell transplant or any organ transplant in the prior 84 days
• Graft versus host disease (GVHD) of any grade or GVHD treatment with exception of low dose steroids