Tumour stage (P = 0.031∗χ2), ER negativity (ER-) (P = 0.009∗¶), PgR negativity (PgR-) (P = 0.006∗¶) and HER2 enriched molecular subtype (HER2) (P = 0.009∗¶) were all associated with achieving pCR in the breast (Table 4). This evidence concerns the gene PGR and neoplasm.