| Two‐stage meta‐analysis based on random‐ effects Cox model | Radiochemotherapy subset including studies 21481, 70404 | Radiochemotherapy subset without studies 21481, 70404 |
| ESA versus control | HR (95% CI) | HR (95% CI) |
| Chemotherapy | 1.09 (0.97‐1.23) | 1.09 (0.97‐1.23) |
| Radiochemotherapy | 1.47 (0.83‐2.59) | 1.50 (0.84‐2.67) |
| Radiotherapy | 1.51 (0.73‐3.12) | 1.51 (0.73‐3.12) |
| Mixed | 1.50 (0.62‐3.66) | 1.50 (0.62‐3.66) |
| None | 1.32 (1.06‐1.65) | 1.32 (1.06‐1.65) |
| Overall | 1.16 (1.05‐1.29) | 1.16 (1.05‐1.29) |
| LR test | 0.4234 | 0.4063 |