ALDH1A1 and colorectal carcinoma: High ALDH1 expression was correlated with poor DFS in western CRC patients (OR = 0.41, 95%CI: 0.24–0.71, P = 0.001), but not in eastern CRC patients (OR = 0.43, 95%CI: 0.05–3.46, P = 0.43).