- patient age
- lymphovascular invasion
- estrogen receptor negativity
- number of involved lymph nodes
..The 1545 patients were scored according to the previously developed criteria:
- low risk (score 0-1), 920 (59.6%)
- intermediate risk (score 2-3), 493 (31.9%)
- high risk (score ≥4). 132 (8.5%)
The 5-year locoregional control rates with and without PMRT in low-risk, intermediate-risk, and high-risk groups were 98% versus 97% (P=.41), 97% versus 91% (P=.0005), and 89% versus 50% (P=.0002) respectively.
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