IL13RA2 and hereditary pheochromocytoma-paraganglioma: Similarly, it has been reported that the high expression of IL-13Rα2 is observed in 100% of pheochromocytoma [22], 66% of colorectal cancer [26], 62% of glioma [14], 50% of gastric cancer [27], and 7.5% of melanoma [21].