11 Patient Demographics Characteristic Tamoxifen (n=4868) Exemestane (n=4898) Mean age (range)64 (35-91)65 (36-96) Histological grade, n (%) G1 (well) G2 (moderate) G3-G4 (poor) 834 (19) 2362 (53) 1232 (27) 843 (19) 2433 (54) 1206 (27) T Stage, n (%) T1 (≤2 cm) T2 (>2 cm and ≤5 cm) T3 (>5 cm) 2848 (59) 1763 (36) 174 (4) 2843 (58) 1828 (37) 161 (3) N Stage, n (%) N negative N positive Unknown 2555 (52) 2279 (47) 34 (1) 2558 (52) 2306 (47) 34 (1) ER and/or PgR positive, n (%)4859 (100)4887(100) Most extensive surgery, n (%) Mastectomy Wide local excision 2183 (45) 2680 (55) 2148 (44) 2744 (56) Adjuvant chemotherapy1743 (36)1774 (36) Radiotherapy3314 (69)3376 (70)