TACSTD2 and acinar cell carcinoma: All of the following entities showed a positive Trop-2 protein expression (either weak, moderate or high): mucoepidermoid carcinomas (n = 24, 100%), acinic cell carcinomas (n = 10, 100%), adenocarcinomas NOS (n = 9, 100%), secretory carcinomas (n = 7, 100%), basal cell adenocarcinomas (n = 3, 100%), polymorphic adenocarcinomas (n = 1, 100%) and carcinomas ex pleomorphic adenoma (n = 1, 100%).