RECTIFY-1: Neoadjuvant Botensilimab + Balstilimab in MSS/pMMR Early Rectal Cancer
brief summary
This is a multi-site, prospective, non-randomized phase 2 study evaluating neoadjuvant botensilimab in combination with balstilimab for patients with microsatellite stable (MSS) / mismatch repair proficient (MMRp) early rectal cancer staged T1-T2 N0 by MRI and considered candidates for surgical resection without standard neoadjuvant therapies. Participants will receive a single IV dose of botensilimab on Day 1 followed by balstilimab IV every 2 weeks for up to 6 months, with tumor response assessments during treatment and follow-up afterward.
detailed description
This study is a multi-site, prospective, non-randomized, phase 2 trial. The protocol proposes to treat 16 participants with a single fixed dose of botensilimab 75 mg IV on the first day of treatment, followed by balstilimab 240 mg IV every 2 weeks for up to 6 months. The schema states that patients with stage I MSS/MMRp rectal cancer (T1-2 N0 by MRI) will undergo tumor response assessment during treatment for 6 months. After treatment, participants with complete or near complete response and pathologic complete response at local excision may undergo non-operative management with long-term surveillance, while those with residual disease or tumor progression will undergo management per standard of care. The study calendar includes treatment cycles, discontinuation, 30-day and 90-day safety follow-up, efficacy follow-up, and survival follow-up by phone every 12 weeks.
official title
A Phase 2 Study of the Safety and Efficacy of Neoadjuvant Botensilimab in Combination With Balstilimab in the Treatment of Microsatellite Stable / Mismatch Repair Proficient Early Rectal Cancer (RECTIFY-1)