NCIt definition : The most prevalent Gleason pattern in a prostate biopsy or prostatectomy specimen.
The Gleason score is defined by adding the most prevalent (primary) and second most
prevalent (secondary) patterns.;
Alternative definition : CDISC: The most prevalent Gleason pattern in a prostate biopsy or prostatectomy specimen.
(Gleason, D. F. (1977). The Veteran's Administration Cooperative Urologic Research
Group: histologic grading and clinical staging of prostatic carcinoma. In Tannenbaum,
M. Urologic Pathology: The Prostate. Philadelphia: Lea and Febiger. pp. 171-198.);