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Discrimination of models including Gleason data from original source versus standardized review of prostatectomy specimens. C-statistics from models of 10-year survival with Gleason score categorized as a 10-level ordinal variable for Gleason scores 2 to 10 (with separate codes for Gleason 3 + 4 and 4 + 3). Standardized Gleason score C-statistic, 0.86; original Gleason score C-statistic, 0.82.
