%0 Journal Article %T The combination of Ki67, histological grade and estrogen receptor status identifies a low-risk group among 1,854 chemo-naive women with N0/N1 primary breast cancer %A Carina Strand %A Martin Bak %A Signe Borgquist %A Gunilla Chebil %A Anna-Karin Falck %A Marie-Louise Fj llskog %A Dorthe Grabau %A Ingrid Hedenfalk %A Karin Jirstr m %A Marie Klintman %A Per Malmstr m %A Hans Olsson %A Lisa Ryd¨Śn %A Olle St l %A Par-Ola Bendahl and Marten Fern %J SpringerPlus %D 2013 %I Springer %R 10.1186/2193-1801-2-111 %X We have confirmed a prognostic index based on a proliferation marker (Ki67), histological grade, and ER for identification of a low-risk group of patients with N0/N1 primary breast cancer. For this low-risk group constituting 57% of the patients, with a five-year distant disease-free survival of 92%, adjuvant chemotherapy will have limited effect and may be avoided. %U http://www.springerplus.com/content/2/1/111/abstract