GRN and prostate intraepithelial neoplasia: We evaluated by immunohistochemical analysis progranulin expression levels in normal versus prostate cancer sections and demonstrated that progranulin was expressed at low levels, in normal prostate but was instead upregulated in tumor glands (42), confirming the data by Pan et al. (61), who assessed progranulin (GP88) in normal prostate, prostatic intraepithelial neoplasia, and prostatic adenocarcinoma tissues.