As these receptors are involved in cell proliferation, differentiation, and apoptosis, their inhibition may play a critical role in the prevention of tumor growth and spread, including epidermal growth factor receptor- (EGFR-) mutation-positive non-small cell lung cancer (NSCLC) and metastatic head and neck cancer [17–21]. The gene discussed is EGFR; the disease is non-small cell lung carcinoma.