Implementation of a Tumor Response Assessment Program Integrating the Shared Medical Decision Into the Organ Preservation Strategy for Rectal Cancer Patients

three steps of tumor response evaluation (STEP 1 at 2 months, STEP 2 at 4 months, STEP 3 at 6 months after completion of neoadjuvant treatment): STEP 1: digital rectal examination, pelvic MRI, rectoscopy, TAP scan STEP 2: DRE, pelvic MRI, rectoscopy STEP 3: DRE, pelvic MRI, rectoscopy, TAP or PET scan

Assessment at 2 months (+/- 7 days) after neoadjuvant treatment: digital rectal exam, pelvic MRI, rectoscopy, TAP scan

At each stage of the monitoring program and depending on the clinical and oncological results, the decision to preserve the rectum will be discussed with the patient according to a shared-decision program.

The decision to preserve the rectum is based on assessment at 2 months after completion of neoadjuvant treatment (standard of care since the GRECCAR2 trial).

Every 3 months for 2 years, then every 6 months for the third year