The ABCB1 mRNA expression significantly correlated with shorter overall survival in acute myeloid leukemia (n = 1608), multiple myeloma (n = 1416), and hepatocellular carcinoma (n = 371) (Figure 10) but not in other cancer types (carcinomas of the bladder, breast, esophagus, head and neck, kidney, lung, ovary, pancreas, rectum, stomach, thyroid, or uterus; pheochromocytoma and paraganglioma, testicular germ cell tumors, and thymoma). Here, ABCB1 is linked to hereditary pheochromocytoma-paraganglioma.