In order to further investigate the role of MST1 and YAP in NKTCL tumorigenesis, sh‐YAP or sh‐MST1 and plasmids encoding YAP or MST1 were used to knockdown or overexpress YAP and MST1, respectively, in NKTCL cells (SNK6 and YTS cells). The gene discussed is MST1; the disease is extranodal nasal NK/T cell lymphoma.