Anamorelin for cancer cachexia.

Cancer anorexia-cachexia syndrome is a multifactorial condition characterized by significant weight loss due to muscle loss. It is associated with functional impairment, changes in body composition and nutritional disorders. Ghrelin receptors are involved in the release of growth hormone (GH) in the pituitary gland and increase appetite via the hypothalamus. The secretion of GH from the pituitary gland stimulates the liver to secrete insulin-like growth factor 1 (IGF-1), which promotes muscle protein synthesis. Anamorelin is a ghrelin receptor agonist used to treat cancer cachexia. It promotes GH secretion via ghrelin receptor activation and increases appetite, resulting in increased muscle mass and weight. Clinical trials of anamorelin have demonstrated a significant increase in lean body mass index, improved cachexia and no significant increase in serious adverse events. The present review describes the processes leading to the approval of anamorelin in Japan, focusing on pharmacology, metabolism, efficacy, safety and clinical trials.