SDHB and neoplasm: All the five tumours in this study had a typical immunophenotype characterized by diffuse positivity for CK7 and negativity for CD117, and were also positive for PAX-8, E-cadherin, FH and SDHB, but negative for vimentin, CD10, P504s, CA9, CK20, TFE3, TFEB, HMB45, and ALK.