PRF1 and neoplasm: Cluster 0 (C0) NK cells exhibited high expression of IL2RA, TCF7, BACH2, and AREG, markers also present in blood CD56hiNK cells.[32, 34, 45] C1 NK cells highly expressed HAVCR2, FCGR3A, PRF1, and CST7, markers commonly found in cytotoxic CD56dimNK cells.[32, 34] C2 NK cells also showed high AREG expression along with genes associated with tumor‐infiltrating NK cells (RGS1, CD69)[23] and AP‐1 family members (JUN, ATF3, FOSB).