MKI67 and breast carcinoma: The corresponding 8-year cumulative breast cancer mortality risks varied little over the first 4 categories, taking values of 3.3% (95% CI = 2.8% to 4.0%), 3.7% (95% CI = 3.0% to 4.4%), 3.4% (95% CI = 2.8% to 4.1%), and 3.4% (95% CI = 2.8% to 4.1%) for women with Ki67 scores of 0%-5%, 6%-10%, 11%-19%, and 20%-29%, respectively (Figure 3, A, middle panel).