Table 3.
Subgroup analyses of radiotherapy effect on BCSS in patients with different features.
| Variable | PMRT group death/patient | No-PMRT group death/patient | HR (95% CI) | P |
|---|---|---|---|---|
| Age | ||||
| <40 | 128/1,315 | 141/1,195 | 1.03 (0.77–1.39) | 0.831 |
| 40–70 | 339/6,360 | 338/6,076 | 0.91 (0.76–1.10) | 0.338 |
| ≥70 | 390/987 | 385/1,038 | 1.24 (1.04–1.48) | 0.017 |
| Race | ||||
| White | 1,045/9,782 | 1,158/9,803 | 1.00 (0.92–1.08) | 0.937 |
| Black | 211/1,483 | 242/1,443 | 0.98 (0.82–1.18) | 0.858 |
| Other | 119/1,320 | 142/1,339 | 0.92 (0.72–1.17) | 0.485 |
| Marital status | ||||
| Married | 818/8,187 | 961/8,193 | 0.94 (0.86–1.04) | 0.223 |
| Unmarried | 557/4,398 | 581/4,392 | 1.05 (0.93–1.18) | 0.423 |
| Tumor stage | ||||
| T1 | 297/4,188 | 366/4,176 | 0.96 (0.82–1.12) | 0.607 |
| T2 | 1,078/8,397 | 1,176/8,409 | 0.99 (0.92–1.08) | 0.911 |
| Grade | ||||
| 1 | 44/1,151 | 51/1,149 | 0.99 (0.66–1.50) | 0.981 |
| 2 | 384/5,261 | 487/5,242 | 0.99 (0.78–1.02) | 0.105 |
| 3 | 947/6,173 | 1,004/6,194 | 1.03 (0.94–1.12) | 0.536 |
| ER status | ||||
| Negative | 560/2,854 | 602/2,806 | 0.96 (0.86–1.08) | 0.482 |
| Positive | 815/9,731 | 940/9,779 | 1.01 (0.92–1.11) | 0.779 |
| PR status | ||||
| Negative | 733/4,218 | 785/4,191 | 0.99 (0.90–1.10) | 0.914 |
| Positive | 642/8,367 | 757/8,394 | 0.98 (0.88–1.09) | 0.725 |
| No. of LNs positive | ||||
| 1 | 559/5,590 | 539/5,545 | 1.21 (1.08–1.36) | 0.002 |
| 2 | 418/3,923 | 538/4,276 | 0.96 (0.85–1.09) | 0.552 |
| 3 | 398/3,072 | 465/2,764 | 0.78 (0.64–0.90) | <0.001 |
| Chemotherapy | ||||
| No | 168/1,591 | 187/1,592 | 1.01 (0.82–1.24) | 0.955 |
| Yes | 1,207/10,994 | 1,355/10,993 | 0.98 (0.91–1.06) | 0.617 |