| Two‐stage meta‐analysis based on random‐effects Cox model | Radiochemotherapy treatment group merged to radiotherapy treatment group | Radiochemotherapy treatment group merged to chemotherapy treatment group |
| ESA versus control | HR (95% CI) | HR (95% CI) |
| Chemotherapy | 1.09 (0.97‐1.23) | 1.11 (0.98‐1.25) |
| Radiotherapy | 1.48 (0.95‐2.32) | 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 | 0.2715 | 0.4246 |
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