The neuroendocrine tumor was positive for chromogranin and synaptophysin; GIST showed immunopositivity for CD117 and SMA; Synovial sarcoma showed immunoexpression of panCK, Bcl2 and TLE1; and epithelioid angiomyolipoma was positive for vimentin, CK7 and HMB45. The gene discussed is KIT; the disease is neuroendocrine neoplasm.