Due to strategic business considerations, Sutro has deprioritized the development of luveltamab tazevibulin, leading to termination of the REFRaME program. This decision is not related to any safety or efficacy concerns associated with luvelta

A Phase 2/3 study to investigate the efficacy and safety of luveltamab tazevibulin versus IC chemotherapy in women with ovarian cancer (including fallopian tube or primary peritoneal cancers) expressing FOLR1.

This is a randomized, multicenter, international, open-label, 2-part, Phase 2/3 study designed to assess the efficacy and safety of luveltamab tazevibulin versus IC chemotherapy in subjects with relapsed platinum-resistant epithelial ovarian cancer expressing FOLR1.

Part 1 will consist of 2 luveltamab tazevibulin dosing cohorts (Cohort A and Cohort B), with subjects randomized 1:1. Part 1 will be used to select the optimized dosing regimen.

Part 2 will further evaluate the efficacy and safety of the selected dosing regimen versus IC chemotherapy.

Luveltamab tazevibulin will be administered intravenously (IV) over a 1-hour infusion time every 3 weeks.

Inclusion Criteria:

1. High grade serous epithelial ovarian cancer, fallopian tube or primary peritoneal cancer
2. Age ≥ 18 years
3. ECOG performance status 0 to 1
4. Positive FOLR1 expression per central laboratory testing
5. Relapsed platinum-resistant epithelial ovarian cancer and received a total of 1 to 3 prior regimens
6. Prior bevacizumab treatment is required, if labeled and available as standard of care per institutional guidelines, unless subject has documented contraindication
7. At least 1 measurable target lesion per RECIST v1.1
8. Adequate organ function

Exclusion Criteria:

1. Low grade (Grade 1) ovarian carcinoma, clear cell, mucinous, endometrioid, sarcomatous, and mixed histology ovarian carcinomas
2. Prior treatment with a FOLR1- targeting ADCs or with ADCs that contain a tubulin inhibitor
3. Primary platinum-refractory disease
4. History of severe allergic or anaphylactic reactions to monoclonal antibody therapy or to antibody-related fusion protein treatment
5. Pre-existing clinically significant ocular disorders, severe chronic obstructive pulmonary disease or asthma, clinically significant cardiac or cerebrovascular disease, or other significant concurrent, uncontrolled medical condition
6. Previous solid organ transplantation
7. History or clinical signs of meningeal or active central nervous system involvement
8. Concurrent participation in another therapeutic treatment trial