Analyses adjusting for selective crossover show improved overall survival with adjuvant letrozole compared with tamoxifen in the BIG 1-98 Study

- Colleoni, Marco; Giobbie-Hurder, Anita; Chirgwin, Jacquie; Pienkowski, Tadeusz; Wardley, Andrew; Price, Karen N.; Gelber, Richard D.; Coates, Alan S.; Goldhirsch, Aron; Regan, Meredith M.; Thürlimann, Beat; Mouridsen, Henning; Mauriac, Louis; Forbes, John F.; Paridaens, Robert; Láng, István; Smith, Ian