IL13RA2 and prostate cancer: IL‐13Rα2, a high affinity IL‐13 binding protein, is overexpressed in a number of solid human cancers such as glioblastoma multiforme (GBM), certain types of head and neck cancer, AIDS Kaposi's sarcoma, pancreatic cancer, prostate cancer, ovarian cancer and pulmonary cancer but with limited or no expression in normal tissues.12, 13