Validation and Comparison of CS-IHC4 Scores with a Nomogram to Predict Recurrence in Hormone Receptor-Positive Breast Cancers

The aim of this study was to both develop and validate a nomogram based on the Ki-67 index to predict recurrence. We constructed a nomogram using the Cox proportional hazards model with 953 N0 and N1 postoperative hormone receptor (HR)-positive breast cancer patients and validated it in an external cohort of 895 patients. A prognostic model that used classical variables, Adjuvant! Online, St. Gallen risk stratification, and the four...