CCND1 and breast cancer: In the Cox regression analysis restricted to Luminal A and Luminal B (HER2−) cases (n = 410) using mean CCND1 CN < 4 as the reference, the rate of death from BC was similar for cases with mean CCND1 CN ≥ 6 (HR 0.95 (95% CI 0.51–1.78), Table 6).