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NSABP B17: ipsilateral breast tumor recurrence.
| NSABP B-17 | Number of events | Rate/1000 patient/year | Relative risk | P value |
|---|---|---|---|---|
| Noninvasive | ||||
|
| ||||
| Lumpectomy alone | 62 | 14.7 | 0.47 | <0.001 |
| Lumpectomy + RT | 37 | 7.5 | ||
|
| ||||
| Invasive | ||||
|
| ||||
| Lumpectomy alone | 79 | 18.8 | 0.52 | <0.001 |
| Lumpectomy + RT | 44 | 9.0 | ||
