Tumor tissues of breast invasive carcinoma (BRCA), esophageal carcinoma (ESCA), pheochromocytoma, paraganglioma (PCPG), glioblastoma multiforme (GBM), stomach adenocarcinoma (STAD), and uterine corpus endometrioid carcinoma (UCEC) had higher SLC31A1 expression levels when compared to corresponding normal tissues (all P < 0.01). The gene discussed is SLC31A1; the disease is pheochromocytoma.