NPM1 and cancer: Nucleophosmin overexpression is frequently found in human cancers, including cancers of the stomach (Tanaka et al, 1992), colon (Nozawa et al, 1996), bladder (Tsui et al, 2004), prostate (Subong et al, 1999), thyroid (Onda et al, 2004), ovary (Zhang, 2004), and myeloid and lymphoid cells (Schnittger et al, 2005).