MUC2 and colorectal carcinoma: A high level of MUC1 expression (T3/T4 vs. T1/T2: OR = 1.79, 95% CI = 1.41–2.26, P < 0.00001) was associated with deeper invasion in patients with CRC, but the association between MUC5AC and MUC2 expression and depth of invasion was not significant.