MUC5AC and carcinoma: The expression rates in cancer lesions (more than 5% of carcinoma cells stained) were MUC1, 51.7% (31/60); MUC2, 26.7% (16/60); MUC3, 55% (33/60); MUC4, 51.7% (31/60); MUC5AC, 33.3% (20/60); MUC6, 10% (6/60) and MUC16, 8.3% (5/60) (Figure 1).