CEACAM5 and neoplasm: Carcinoembryonic antigen (CEA) ≥5 μg/L at diagnosis (OR 0.190, 95% CI 0.037–0.971, p = 0.046), tumor size ≥3 cm (OR 0.123, 95% CI 0.020–0.745, p = 0.023), distance of tumor from the anal verge ≥3 cm (OR 0.091, 95% CI 0.013–0.613, p = 0.014), clinically node-positive disease at diagnosis (OR 0.201, 95% CI 0.045–0.895, p = 0.035), and interval from CRT to surgery ≥8 weeks (OR 5.267, 95% CI 1.068–25.961, p = 0.041) were independent predictors of CR.