KRT19 and thyroid gland papillary carcinoma: Immunohistochemically, the papillary carcinoma stained positively for pan cytokeratin (CK) (Fig. 2c) and cytokeratin 19 (CK19) (data not shown), while the infiltrating mononuclear cells showed diffuse, strong reactivity for CD1a (Fig. 2d), CD43, S100 protein and were negative for myeloperoxidase, LCA and HMB45 immunostians (data not shown).