Factorial discriminant analysis (FDA) of microarray-based genome-wide H3K27me3 profiles derived from prostate biopsies. Prostate biopsies were obtained from healthy patients (n = 13), prostate cancer patients with Gleason score ≤ 7 (n = 10) and prostate cancer patients with Gleason score > 7 (n = 11). Data showed a well-defined separation between patients according to Gleason score and H3K27me3 markers. Center of gravity for each group is reported as the empty symbol. G1, healthy group; G2, prostate cancer with Gleason score ≤ 7; G3 prostate cancer with Gleason score > 7