Results of the ATAC (Arimidex, Tamoxifen, Alone or in Combination) trial after completion of 5 years' adjuvant treatment for breast cancer. - Howell,A.; Cuzick,J.; Baum,M.; Buzdar,A.; Dowsett,M.; Forbes,J.F.; Hoctin-Boes,G.; Houghton,J.; Locker,G.Y.; Tobias,J.S. (Lancet, 2005)