Table 1.
Basic information of the included literature.
| Author | Year | Country | Study design | Sample size (n) | Sex | T stage | N stage | M stage | Tumor size | NOS | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Male | Female | T1–3 | T4 | N0–2 | N3 | M0 | M1 | ≤5 cm | >5 cm | ||||||
| Yang | 2018 | China | Cohort study | 375 | 209 | 166 | 116 | 259 | 206 | 169 | 337 | 38 | NA | NA | 7 |
| Zhou | 2020 | China | Cohort study | 403 | 259 | 144 | 176 | 227 | 292 | 111 | 360 | 43 | 227 | 176 | 8 |
| Guo | 2020 | USA | Cohort study | 7149 | 3758 | 3391 | 5845 | 1304 | 6621 | 528 | 4794 | 2355 | NA | NA | 9 |
| Shi | 2019 | USA | Cohort study | 4638 | 2446 | 2192 | 2424 | 1188 | 3606 | 626 | 2647 | 1991 | NA | NA | 9 |
| Chen | 2018 | China | Cohort study | 347 | 181 | 166 | 315 | 32 | 335 | 12 | 341 | 6 | NA | NA | 8 |
| Kunisaki | 2004 | Japan | Cohort study | 54 | 28 | 26 | NA | NA | 51 | 3 | NA | NA | NA | NA | 9 |
| KYUNG | 2011 | Korea | Cohort study | 41 | 19 | 22 | NA | NA | NA | NA | NA | NA | 9 | 32 | 9 |
| Kyoung-Joo | 2013 | Korea | Cohort study | 205 | 149 | 56 | NA | NA | NA | NA | NA | NA | NA | NA | 6 |
| Kao | 2018 | Taiwan | Cohort study | 185 | 96 | 89 | NA | NA | 181 | 4 | NA | NA | NA | NA | 6 |
| Li | 2020 | China | Cohort study | 144 | 96 | 48 | 61 | 83 | NA | NA | NA | NA | NA | NA | 6 |
| Tang | 2020 | China | Cohort study | 266 | 182 | 84 | 137 | 129 | 181 | 85 | NA | NA | 187 | 79 | 8 |
| Wang | 2021 | China | Cohort study | 1686 | 879 | 807 | 1021 | 665 | 1125 | 561 | 1436 | 250 | 935 | 751 | 9 |