Figure 4.

Kaplan–Meier analysis of metastasis-free survival in subgroups of triple-negative breast cancer patients in the test set. A) Premenopausal patients. B) Postmenopausal patients. Hazard ratio (HR) and 95% confidence interval (CI) could not be computed because of the absence of metastatic events in one of the tested groups. NA = not applicable. C) Patients with tumor size of 2cm or less. Hazard ratio and 95% confidence interval could not be computed because of the absence of metastatic events in one of the tested groups. D) Patients with tumor size greater than 2cm. All statistical tests were two-sided.