Western blot analysis revealed IFN-γ band corresponding to 17.4 kDa in tissue extracts from two out of six cases of the adrenal cortical adenomas, one out of five cases of the phaeochromocytomas and one out of five cases of the clear cell RCCs, whereas the colonic adenocarcinoma and the negative control did not show any band. The gene discussed is IFNG; the disease is pheochromocytoma.