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Correlation of CD57 expression in the TMAs “prostatectomy 1 and prostatectomy 2” with Gleason grade. Gleason grades and staining patterns were dichotomised into presence or absence of a Gleason 4 pattern and absent/low (grey) and moderate/strong (black) CD57 staining, respectively. Differences are statistically significant with the χ²-test in both TMAs (P < 0.0001 and P = 0.0032, resp.).
