KRAS and penile cancer: From a biological perspective, EGFR appears a promising target in penile cancer, as it is universally expressed and frequently phosphorylated (Di Lorenzo et al., 2013a), but infrequently amplified (Di Lorenzo et al., 2013a), or mutated (Di Lorenzo et al., 2013b), while mutations of downstream signaling proteins (such as KRAS/BRAF) are rare (Gou et al., 2013).