KRT8 and sarcomatoid carcinoma: As in the adenocarcinoma, sarcomatoid carcinoma was also comprised of cells with a luminal (CK8+/CK14-/CK5-) or intermediate phenotype (CK8+/CK14+/CK5-), with the notable exception of the absence of CK8+/CK14+/CK5+ cells (Table 1).