CD213a2, also known as IL-13Ralpha2, is a type I transmembrane protein and member of the hematopoietin family. IL13Ra2 is the high affinity receptor for IL-13, but it possibly acts as a decoy receptor to antagonize IL-13Ralpha1/IL-4Ra-mediated IL-13 biological functions. IL13Ralpha2 is expressed by fibroblasts, smooth muscle cells, keratinocytes and activated B cells. However, its presence on the cell surface is highly regulated. CD213a2 is also expressed in various types of cancer which makes it an attractive therapeutic target.