Immunohistochemical staining of normal and malignant human prostate samples showed that MET protein expression is absent in epithelial cells of normal prostate glands and low in benign prostate hyperplasia, whereas it is frequently detected in PIN, localized and metastatic prostate tumors (Nakashiro et al., 2003; Pisters et al., 1995). The gene discussed is MET; the disease is benign prostatic hyperplasia.