Examples include the treatment of follicular lymphoma with rituximab (120), human epidermal growth factor receptor-2 (HER2) positive breast cancer with trastuzumab (121), non-small cell lung cancer with cetuximab and avelumab (122), and multiple myeloma cases with daratumab and all-trans retinoic acid (123), among others. The gene discussed is ERBB2; the disease is plasma cell myeloma.