The immunohistochemical study showed that the tumor cells were immunoreactive for AE1/AE3, Cg A (Fig. 1d), Syn (Fig. 1e), CD56, P16, CAM5.2, and PGP9.5 and negative for ER, PR, P63, P40, CK7, and CK20. The gene discussed is KRT7; the disease is neoplasm.