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Table 5 Multivariate Cox regression analysis of the effect of postoperative radiotherapy on breast cancer-specific survival and overall survival by variable

From: The effects of postoperative radiotherapy on survival outcomes in patients under 65 with estrogen receptor positive tubular breast carcinoma

Variables BCSS OS
Adjusted HR of RT 95% CI p Adjusted HR of RT 95% CI p
Age (years)
  < 50 0.042 0.005–0.393 0.005 0.396 0.161–0.971 0.043
  ≥ 50 0.746 0.155–3.588 0.715 0.726 0.463–1.139 0.163
Race/ethnicity
 Non-Hispanic white 0.239 0.080–0.711 0.01 0.612 0.404–0.927 0.020
 Non-Hispanic black 0.375   0.997 0.558 0.049–6.369 0.638
 Hispanic 2.108 0.225–19.747 0.514
 Other 1.564 0.981 0.976
Grade
 Well differentiated 0.287 0.102–0.809 0.018 0.647 0.423–0.990 0.045
 Moderately, poorly/undifferentiated 0.615 0.180–2.096 0.439
Tumor size
  ≤ 1.0 cm 0.340 0.098–1.175 0.088 0.698 0.432–1.129 0.143
  > 1.0 cm and ≤ 2.0 cm 0.172 0.024–1.239 0.081 0.543 0.259–1.140 0.107
PR status
 Negative 0.648 0.056–7.445 0.727 0.646 0.223–1.791 0.404
 Positive 0.204 0.059–0.705 0.012 0.631 0.407–0.978 0.039
  1. BCSS breast cancer-specific survival, HR hazard ratio, CI confidence interval, OS overall survival, PR progesterone receptor, RT radiotherapy