Ki67 index, HER2 status, and prognosis of patients with luminal B breast cancer - Cheang, M C; Chia, S K; Voduc, D; Gao, D; Leung, S; Snider, J; Watson, M; Davies, S; Bernard, P S; Parker, J S; Perou, C M; Ellis, M J; Nielsen, T O (J Natl Cancer Inst, 2009)