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Gleason score 5 + 3 = 8 prostate cancer: much more like Gleason score 9?
Author(s) -
Mahal Brandon A.,
Muralidhar Vinayak,
Chen YuWei,
Choueiri Toni K.,
Hoffman Karen E.,
Hu Jim C.,
Sweeney Christopher J.,
Yu James B.,
Feng Felix Y.,
Trinh QuocDien,
Nguyen Paul L.
Publication year - 2016
Publication title -
bju international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.773
H-Index - 148
eISSN - 1464-410X
pISSN - 1464-4096
DOI - 10.1111/bju.13239
Subject(s) - medicine , prostate cancer , confidence interval , hazard ratio , prostate , framingham risk score , oncology , urology , disease , cancer
Objective To determine whether patients with Gleason score 5 + 3 = 8 prostate cancer have outcomes more similar to other patients with Gleason score 8 disease or to patients with Gleason score 9 disease. Patients and Methods The Surveillance, Epidemiology and End Results ( SEER ) database was used to study 40 533 men diagnosed with N0M0 Gleason score 8 or 9 prostate cancer from 2004 to 2011. Using Gleason score 4 + 4 = 8 as the referent, Fine and Gray competing risks regression analyses modelled the association between Gleason score and prostate cancer‐specific mortality ( PCSM ). Results The 5‐year PCSM rates for patients with Gleason score 4 + 4 = 8, 3 + 5 = 8, 5 + 3 = 8, and 9 disease were 6.3%, 6.6%, 13.5%, and 13.9%, respectively ( P < 0.001). Patients with Gleason score 5 + 3 = 8 or 9 disease had up to a two‐fold increased risk of PCSM (adjusted hazard ratio [ AHR ] 1.89, 95% confidence interval [ CI ] 1.50–2.38, P < 0.001; and AHR 2.17, 95% CI 1.99–2.36, P < 0.001, respectively) compared with the referent group of patients (Gleason score 4 + 4 = 8). There was no difference in PCSM between patients with Gleason score 5 + 3 = 8 vs 9 disease ( P = 0.25). Conclusions Gleason score 8 disease represents a heterogeneous entity with PCSM outcomes distinguishable by the primary Gleason pattern. The PCSM of Gleason score 3 + 5 = 8 and Gleason 4 + 4 = 8 disease are similar, but patients with Gleason score 5 + 3 = 8 have a risk of PCSM that is twice as high as other patients with Gleason score 8 disease and should be considered to have a similar poor prognosis as patients with Gleason score 9 disease. Such patients should be allowed onto trials seeking the highest‐risk patients in which to test novel aggressive treatment strategies.