CEACAM5 and rectal cancer: Univariate analysis to determine possible variables that could affect overall and disease-free survival among rectal cancer patients showed that the CEA level (RR = 1.002, 95%CI: 1.012- 3.831, P = 0.049), the presence of TDs (RR = 4.014, 95%CI: 1.712-9.411, P = 0.001), and the number of neoadjuvant chemotherapy cycles (RR = 0.828, 95%CI: 0.709-0.967, P = 0.022) were strongly related to overall survival.