Immunohistochemistry is important for the accurate diagnosis of basal cells in atypical glandular proliferations of the prostate.\np40, an isoform of p63, may be an adjunct to a marker panel in this setting. Biopsies of 68 patients were analyzed by\nimmunohistochemistry using antibodies to 34betaE12 and p40. Basal cell staining was classified as negative, partial (<60%), or\ndiffuse (�60%); irregular staining was defined as discordant staining patterns. In acinar proliferations (
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