Prevalence of prostatic intra-epithelial neoplasia (PIN) in biopsies from hospital practice and pilot screening: clinical implications.

As high grade PIN is commonly associated with concomitant cancer, current literature recommends re-biopsy of patients with high grade PIN. This paper describes the prevalence of high grade prostatic intra-epithelial neoplasia (PIN) from three independent clinical settings, reported by a single pathologist (MCP). High grade PIN was diagnosed in biopsies from 131 of the 1205 (11%) of patients in whom cancer was suspected in hospital practice, 42 of the 202 (20%) asymptomatic men screened for prostate cancer and 29 of the 118 (25%) patients presenting with prostatism in a case finding study. Re-biopsy on this scale has major clinical and cost implications. However, from a literature review, there is evidence to suggest that the risk of concomitant cancer with high grade PIN may be stratified according to serum PSA. This opinion should be tested prospectively.