Figure 3. Subgroup Analysis of Disease-Specific Mortality in 434 Patients With Triple-Negative Breast Cancer.

Using the unadjusted Cox model, exploratory subgroup analyses were conducted to estimate hazard ratios with 95% CIs and to test for interactions among subgroups using 2-sided P values. The median observation was 61 months.

^aTumor size at diagnosis was based on pathological assessment.

^bHistological grade at diagnosis was based on the degree of tumor’s histologic differentiation.

^cKi-67 index at diagnosis indicates DNA synthetic activity as measured by immunocytochemistry.