21 Cheang Cheang MC MC Chia Chia SK SK Voduc Voduc D D Gao Gao D D Leung Leung S S Snider Snider J J Ki67 index, HER2 status, and prognosis of patients with luminal B breast cancer Ki67 index, HER2 status, and prognosis of patients with luminal B breast cancer J Natl Cancer Inst J Natl Cancer Inst 2009 2009 101 101 736 736 750 750 10.1093/jnci/djp082 10.1093/jnci/djp082 19436038 19436038. The gene discussed is ERBB2; the disease is breast carcinoma.