KRT14 and cancer: CK14 showed positivity in 23 cases in resting cells (with the exception of 1 complex carcinoma and benign and malignant myoepithelial tumors), in 22 cases in proliferative cells (6 carcinomas in benign mixed tumors and 15 complex carcinomas) with a trend to lose the expression when these cells had acquired the more motile phenotype of spindle cells (positive in 2 benign and 3 malignant myoepithelial tumors, 2 carcinomas in benign mixed tumors and 2 complex carcinomas).