Einstein (São Paulo) (Dec 2009)
Prostate biopsies containing prostate intraepithelial neoplasia and atypical small acinar proliferation: what to do?
Abstract
Objective: The aim of the study was to assess the frequency of high-grade prostate intraepithelial neoplasia and atypical small acinar proliferations on a contemporary series, and their relation to posterior diagnosis of prostate cancer. Methods: A retrospective study was conducted with 6,490 consecutive men submitted to extended prostate biopsies between 2000 and 2005 at a single institution. Of these, 400 men (6.16%) had atypical small acinar proliferation or high-grade prostatic intraepithelial neoplasia, and 43 had at least one follow-up biopsy. Rresults: The overall incidence of high-grade prostatic intraepithelial neoplasia was 4.6% and 1.4% for atypical small acinar proliferation. High-grade prostatic intraepithelial neoplasia plus atypical small acinar proliferation occurred in 0.11% of men. The detection rates of prostate cancer on repeated biopsies were of 38.5 and 53.6% for high-grade prostatic intraepithelial neoplasia and atypical small acinar proliferation, respectively. All patients with high- grade prostatic intraepithelial neoplasia plus atypical small acinar proliferation who had a repeated biopsy were diagnosed with prostate cancer. There was a higher risk of diagnosing prostate cancer in a site close to previous atypical small acinar proliferation (OR = 5.93; p = 0.015). Cconclusions: After high-grade prostatic intraepithelial neoplasia or atypical small acinar proliferation finding on extended biopsies, close follow-up is recommended, and repeated biopsies should be done according to clinical data as well. Rebiopsies should be strongly recommended when the association high- grade prostatic intraepithelial neoplasia plus atypical small acinar proliferation is present, or when atypical small acinar proliferation is found only after the second biopsy. Repeated biopsies after an atypical small acinar proliferation finding should be always randomized, but sites of atypical small acinar proliferation should be more extensively sampled.
