Olanzapine

This phase II trial tests how well olanzapine works in managing cancer cachexia in patients experiencing esophagogastric, hepatopancreaticobiliary, colorectal, or lung cancer that may have spread from where it first started to nearby tissue, lymph nodes, or distant parts of the body (advanced) or that has spread from where it first started (primary site) to other places in the body (metastatic) -associated appetite loss while receiving non-curative cancer therapy. Loss of appetite ("anorexia") in the setting of cancer is a key feature of "cachexia," a syndrome associated with loss of weight and muscle as well as weakness and fatigue. Olanzapine is a drug that targets key neurotransmitters (a type of molecule in the central nervous system that transmits messages to the rest of the body) that may stimulate appetite, restore caloric intake, minimize weight loss, and improve quality of life (QOL).