Das neue ISUP 2014/WHO 2016 Prostatakarzinom-Grading - Status quo 5 Jahre nach seiner Einführung

Background In 2014, the International Society of Urological Pathology (ISUP) introduced a new grading system for prostate cancer (PCa), which was accepted and adopted by the World Health Organisation (WHO) in 2016. The new system defined five distinct grade groups and adjusted several histomorphological criteria. Our study aimed to systematically review and summarise the most recent literature and to compare the new grading system with the former Gleason grading. Material and Methods We performed a literature screening in the PubMed database. A total of 15 studies evaluating the new grading system during the period from 2016 to 2018 were selected for our review. Results The main goals of the new ISUP 2014/WHO 2016 grading system were a more accurate and simplified grade stratification, less overtreatment of indolent PCa as well as improved patient communication. Biochemical recurrence was the most common endpoint for statistical analysis. Most studies found that the new ISUP 2014/WHO 2016 grading system provides higher prognostic accuracy than the former Gleason grading. Notably, however, only a subset of studies clearly demonstrated that the archived samples were not only re-grouped according to the new grade groups, but also re-graded according to the new histomorphological 2014 ISUP criteria. Conclusions The prognostic accuracy of the ISUP 2014/WHO 2016 grade groups was confirmed by the majority of the studies. Nevertheless, the interpretation of the study results should be based upon the criterion of correct re-grading.