In a multivariable analysis adjusted for age, tumor size, nodal status, NHG, Ki67, luminal-like classification, and adjuvant systemic therapy (endocrine +/- chemo), AIB1 was associated with BCM with 10-year FU (HR 6.8, 95% CI 2.3–20, P = 0.001). Here, MKI67 is linked to blue cone monochromacy.