Table 6.

Ten-year risks for overall study and DS risk groups in all evaluable patients.

TotBE
No radiotherapyRadiotherapy
Risk groupRisk (95% CI)NRisk (95% CI)N
Overall study population20% (12–32%)788% (5–11%)377
Low risk group (DS ≤ 3)10% (3–29%)415% (2–10%)149
Elevated risk group (DS > 3)30% (17–51%)3710% (6–15%)228
InvBE
No radiotherapyRadiotherapy
Risk groupRisk (95% CI)NRisk (95% CI)N
Overall study population13% (6–27%)785% (3–8%)377
Low risk group (DS ≤ 3)5% (1–30%)413% (1–9%)149
Elevated risk group (DS > 3)21% (9–44%)376% (3–10%)228
  • Note: The 10-year breast event risks were determined by Kaplan–Meier analysis for TotBE and InvBE risks with 95% CIs and patient counts. The 10-year risks for the overall study population (independent of DCISionRT results) treated with BCS without radiotherapy and BCS plus radiotherapy are presented. Similarly, the 10-year risks for patients in the DCISionRT DS low risk (DS ≤ 3) group and elevated risk (DS > 3) group are presented.