Subgroup analysis based on ethnicity (Asians and Caucasians) showed that p53 expression was not associated with UC-CRC in both Caucasians and Asians (OR = 1.60, 95% CI = 0.89–2.86, P = 0.116; OR = 1.65, 95% CI = 0.77–3.56, P = 0.198; respectively) (Table 2). This evidence concerns the gene TP53 and colorectal carcinoma.