Table 1. The basic information of included studies.
| Study | Year | Country | Study type | Tumor type | Sample | Treatment methods | Analysis type | Survival analysis | NOS score |
|---|---|---|---|---|---|---|---|---|---|
| Arigami | 2015 | Japan | Retrospective | ESCC | 238 | With-surgery | Multivariate- | OS | 7 |
| Arigami | 2016A | Japan | Retrospective | GC | 275 | No-surgery | Univariate | OS | 7 |
| Arigami | 2016B | Japan | Retrospective | GC | 68 | With-surgery | Multivariate | OS | 7 |
| Fu | 2017 | China | Retrospective | HCC | 130 | With-surgery | Univariate | OS, DFS | 8 |
| Kijima | 2017 | Japan | Retrospective | ESCC | 98 | No-surgery | Multivariate | OS | 7 |
| Kuwahara | 2018 | Japan | Retrospective | HPC | 111 | No-surgery | Univariate | OS, PFS | 8 |
| Li | 2018 | China | Retrospective | CRC | 693 | With-surgery | Univariate | OS, DFS | 8 |
| Liu | 2018 | China | Retrospective | GC | 1,293 | With-surgery | Multivariate | OS | 7 |
| Sun | 2020 | China | Retrospective | LARC | 317 | Mixed | Univariate | OS, DFS | 8 |
| Guo | 2018 | China | Retrospective | ESCC and AEG | 356 | With-surgery | Multivariate | OS | 7 |
| Cong | 2019 | China | Retrospective | AEG and UGC | 356 | With-surgery | Univariate | OS | 7 |
| Kong | 2020 | China | Retrospective | HCC | 292 | With-surgery | Multivariate | OS, DFS | 8 |
| Yamamoto | 2020 | Japan | Retrospective | GC | 666 | Mixed | Univariate | OS, RFS | 8 |
| Lin | 2019 | China | Retrospective | ESCC | 327 | With-surgery | Multivariate | OS | 6 |
| Feng | 2019 | China | Retrospective | ESCC | 218 | Mixed | Multivariate | OS | 6 |
| Qin | 2017 | China | Retrospective | CRC | 250 | With-surgery | Univariate | OS | 6 |
ESCC, esophageal squamous cell carcinoma; GC, gastric cancer; HCC, hepatocellular carcinoma; HPC, hypopharyngeal carcinoma; CRC, colorectal cancer; LARC, locally advanced rectal cancer; AEG, adenocarcinoma of the esophagogastric junction; UGC, upper gastric cancer; OS, overall survival; DFS, disease-free survival.