CEACAM5 and neoplasm: Univariate analysis showed that pCR was not associated with sex, tumor location, etc., (P > 0.05 for all), but was significantly associated with age, body mass index (BMI), neutrophil–lymphocyte ratio (NLR), systemic inflammation index (SII), albumin–to–globulin ratio (AGR), post–treatment carcinoembryonic antigen (CEA) levels, and natural killer (NK) cell count (P < 0.05).