ANP32C (acidic (leucine-rich) nuclear phosphoprotein 32 family, member C), also known as PP32R1 (phosphoprotein 32-related protein 1) or tumorigenic protein pp32r1, is a 234 amino acid protein that contains 4 leucine-rich repeats and belongs to the ANP32 family. ANP32C shares 87.7% amino acid sequence identity with ANP32A, a tumor suppressor that inhibits a variety of cancers, such as prostate and breast cancers. Although similar to ANP32A, ANP32C is tumorigenic and is expressed in activated stem cells, such as mobilized CD34+ cells and cord blood CD34+ cells, but not in resting bone marrow CD34+ cells. ANP32C is also expressed in a variety of neoplastic cell lines, mainly in prostatic adenocarcinoma cell lines, but not in normal protastic tissue, and may also modulate the oncogenic potential of human prostate cancer.