Signatures significantly associated with differential response to AI. a. Ordinal regression models in treated patients with Ki67 data (n=227) coloured by FDR for Ki67 response categories and b. Logistic regression models for Ki672wk. Abbreviations: AI, Aromatase inhibitors; logOR, log Odds Ratio; FDR, False discovery rate; HER2-E, HER2-Enriched Subtype; LumB, Luminal B subtype; LumA, Luminal A subtype.