This is quite different from the metabolic regulation of skeletal muscle by IL‐15, which induces the differentiation and accumulation of myosin heavy chain and α‐actinin in myotubes, promotes myofibril protein synthesis, inhibits tumour‐mediated apoptosis in skeletal muscle, and inhibits protein catabolism, thus contributing to the maintenance of myofiber growth and development.9 The gene discussed is IL15; the disease is neoplasm.