Tumor samples with absent immunoexpression of GATA3, FOXA1 and CK5/6 showed significantly lower transcript levels of GATA3, FOXA1 and KRT5/KRT6A, respectively (p < 0.001, p = 0.0130, p < 0.0001 and p = 0.0278) (Fig. 2). Here, KRT5 is linked to neoplasm.