Group C (n = 15) was enriched of luminal-A tumors (11/15, 73%), characterized by the lowest Ki67 levels (mean: 21%, range: 6–64%), a high prevalence of G2 carcinomas (10/15, 67%), and the lowest Genomic Risk scores (mean: 23, range: 0–66) (Additional file 4: Fig. S6A-B, Fig. 6). This evidence concerns the gene MKI67 and carcinoma.