Table 12. cCR criteria.

Evaluation item	cCR criteria
cCR, clinical complete response; MRI, magnetic resonance imaging; T2WI, T2 weighted imaging; ADC, apparent diffusion coefficient; DWI, diffusion weighted imaging.
Digital rectal examination	No clear mass was observed, and the intestinal wall was soft
Endoscopy	No clear residual tumor was observed, and only leukoplakia and/or telangiectasia could be seen in the original tumor area
Pelvic cavity MRI	T2WI showed no clear tumor signal and no suspicious lymph nodes in the tumor bed area; No tumor hyperintensity and no hypointensity in the ADC map with DWI b values between 800−1,000