Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) KEEN JC,The expression of Ki-S1 and BCL-2 and the response to primary tamoxifen therapy in elderly patients with breast cancer,Breast Cancer Res Treat,,,1997,44,,123-133,https://cir.nii.ac.jp/crid/1570854175095287040,