Table 2.
Clinicopathological and prognostic characteristics of included studies
| Study | T grade (1–2/3–4) | N grade (0/1–3) | TNM stage (I–II/III–IV) | Tumor size (<3 cm/>3 cm) | D (W+M/P) | Source of HR | Quality score |
|---|---|---|---|---|---|---|---|
| Liu et al16 | NR | 41/38 | 46/33 | 38/41 | 51/28 | None | 7 |
| Kim et al17 | 96/37 | 82/51 | 93/40 | 49/84 | NR | Reported | 9 |
| Won et al18 | 231/31 | 167/95 | 195/67 | 62/200 | 220/42 | None | 8 |
| Karpathiou et al19 | NR | NR | 82/33 | NR | 32/56 | None | 8 |
| Zhou et al20 | 160/56 | 116/100 | 138/78 | NR | 116/100 | Reported | 9 |
| Jiang et al21 | NR | 80/62 | 107/35 | NR | 85/57 | Reported | 9 |
| Lv et al22 | NR | 55/53 | 86/22 | NR | 62/46 | Estimated | 7 |
| Wang et al23 | NR | 58/46 | 47/57 | NR | 67/37 | Reported | 8 |
Abbreviations: T, tumor; N, node; TNM, tumor node metastasis; D, differentiation; W+M, well and moderate differentiation; P, poor differentiation; HR, hazard ratio; NR, not recorded.