GCH1 expression in breast invasive carcinoma (BRCA), cervica squamous cell carcinoma and endocervical adenocarcinoma (CESC), cholangiocarcinoma (CHOL), ESCA, and kidney chromophobe (KICH), kidney renal clear cell carcinoma(KIRC), kidney renal papillary cell carcinoma (KIRP), liver hepatocellular carcinoma (LIHC), pheochromocytoma and paraganglioma (PCPG), stomach adenocarcinoma (STAD), and uterine corpus endometrial carcinoma (UCEC) showed significant differences. This evidence concerns the gene GCH1 and pheochromocytoma-paraganglioma.