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ROR and Ki67 in tumor grade; (a) Risk of recurrence score (ROR) versus Nottingham Histologic Grade (NHG). Mann–Whitney NHG 1 vs. NHG 2 p = 0.031; NHG 1 vs. NHG 3 p < 0.001; NHG 2 vs. NHG 3 p < 0.001; (b) Ki67 (%) versus NHG. Mann–Whitney p < 0.001 between all groups.
