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Clinical characteristics (294 patients)
| Characteristics | Number (%) |
| Mean age (years) | 43.8 (26–68) |
| Histology | |
| Squamous | 258 (87.8) |
| Adenocarcinoma | 21 (7.1) |
| Adenosquamous | 10 (3.4) |
| Glassy cell | 1 (0.3) |
| Papillary | 4 (1.4) |
| Mean hemoglobin at diagnosis | 12.7 (4.4–18.2) |
Stage distribution is shown in Table 5.
