A Phase ll Study of Neoadjuvant Short-course Radiotherapy Followed by Ivonescimab and Chemotherapy in pMMR/MSS Locally Advanced Rectal Cancer

Summary

The purpose of this study is to evaluate the efficacy and safety of short-course radiotherapy followed by ivonescimab and chemotherapy in participants with pMMR/MSS locally advanced rectal cancer. Patients were randomly assigned to experimental group A or control group B according to a 1:1 ratio. In group A, patients will receive neoadjuvant short-course radiotherapy followed by ivonescimab and chemotherapy. In group B, patients will receive neoadjuvant short-course radiotherapy followed by chemotherapy. After neoadjuvant treatment, the patients and investigator could choose one of the following treatments:(1) Surgery. The patients will receive surgery within 4-8 weeks after the last dose of capecitabine, and the surgical method is selected by the investigator, (2) Watch and Wait (only for patients with clinical complete response after neoadjuvant therapy).

Timeline

Start

2025-04-01

Primary completion

2026-06-01

Completion

2028-12-01

Drugs

Indications