Abstract
The evolution of the famous original grading system for prostatic adenocarcinoma which ini-tially described by Dr. Donald Gleason in the 1960s–1970s passed through two steps of modifications according to two major consensus meetings achieved by the International So-ciety of Urologic Pathology (ISUP) in 2005 and 2014 respectively according to many re-searches and clinical trials to be finely incorporated into the recent World health organization (WHO) classification of prostate cancer and staging system as one of the powerful prognostic factor and treatment decision factor .This articles briefly review historical aspects of the original Gleason grading system and the recent modifications , describing the major changes over the years that finely resulted in the contemporary Gleason grading system, which pro-posed a new “Grade Group” system established by the 2014 ISUP meeting , and then incor-porated to the recent (2016) WHO classification of tumors of the prostate.
Keywords
gleason grade
International Society of Urologic Pathology
prostatic adenocarcinoma