This invention provides use of a SARM compound or a composition comprising the same in treating and preventing muscle wasting in patients with non-small cell lung cancer (NSCLC); treating pre-cachexia or early cachexia (preventing muscle wasting in a cancer patient); treating and preventing loss of physical function due to cancer or cancer therapy; increase of physical function; and increasing survival in a patient with NSCLC, wherein the patients are subjected to cancer therapy.