EGFR and squamous cell carcinoma: EMab-51 also recognized endogenous EGFR in A431 epidermoid carcinoma cells,(16) HSC-2 and HSC-3 oral squamous cell carcinomas,(11) HEK-293T renal epithelial cells,(17) Met-5A mesothelial cells,(18) and MCF-10A breast epithelial cells(19) (Fig. 1C).