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Cohort Creation Based on National Comprehensive Cancer Network Guidelines for Receipt of Post-Mastectomy Radiation Therapy.
| Study Cohort | Tumor Characteristics | N |
|---|---|---|
| Radiation Recommended | Tumor >5 cm in size (regardless of nodal status) Four or more positive lymph nodes (regardless of primary tumor size) |
15,599 |
| Strongly Consider Radiation | Tumor ≤5 cm with 1-3 positive lymph nodes | 15,006 |
| Radiation Not Recommended | Tumor ≤5 cm with 0 positive lymph nodes | 31,837 |
