A Single Microfocus (5% or Less) of Gleason 6 Prostate Cancer at Biopsy-Can We Predict Adverse Pathological Outcomes?
While a microfocus of Gleason score 6 prostate cancer on biopsy is commonly considered low risk disease, there was a greater than 1/5 risk of pathological upgrading and/or up staging. Patients with Gleason score 6 microfocal prostate cancer should be counseled that they may harbor more aggressive disease, especially when pretreatment clinical risk factors are present, such as advanced age or high clinical prostate specific antigen density.
The team at the University of Chicago looked at patients with only 1 small focus of cancer that was the lower grade (6) on biopsy. Overall 42 patients (22%) had adverse pathological outcomes, including upgrading in 35 [higher gleason score] (18%) and upstaging [cancer outside the prostate] in 16 (8%). I performed a similar study almost 2 years ago that also found the amount and type of cancer is underestimated on biopsy.