ARFIP2 and carcinoma: MUC4/8G7 showed a significantly higher rate of the positive expression (≥5% of carcinoma cells stained) in well differentiated types (pap+tub1: 70%, 38/54) than that in poorly differentiated types (por1+por2: 18%, 10/55) (P<0.0001) (Fig. 3A, arrows).