FOXP4 and pheochromocytoma: According to the GEPIA database, lncRNA FOXP4-AS1 was widely expressed in many cancer tissues as compared to normal tissues except adrenocortical carcinoma, kidney renal clear cell carcinoma, acute myeloid leukemia, pheochromocytoma and paraganglioma, and testicular germ cell tumors (Figure 1a).