EPAS1 and pheochromocytoma: Several cancers including colorectal, glioma, pheochromocytoma, neuroblastoma, hepatic carcinoma, renal carcinoma and non‐small cell lung carcinomas are associated with the molecular deregulation of EPAS1.4, 5, 6, 7, 8, 9, 10, 11, 12, 13