Table 1.
Basic characteristics of the included studies.
| First author | Year | Country | Patients | Median age (year) | Cancer type | Follow up (months) | Cut-off value | HR estimation | NOS score |
|---|---|---|---|---|---|---|---|---|---|
| Hideya T | 2017 | US | 275 | 64.5 | Breast cancer | 45 | 15.3% | HR for OS | 7 |
| Cheng S | 2017 | China | 227 | NA | Gastric cancer | 61 | 11.5% | HR for OS | 8 |
| Xie X | 2017 | China | 168 | 49 | Nasopharyngeal carcinoma | 65.2 | 16.3% | HR for OS | 7 |
| Zhang H | 2017 | China | 241 | 57.8 | Laryngeal cancer | 60 | 16.70% | HR for OS | 8 |
| Li N | 2017 | China | 220 | 56.3 | Melanoma | 60 | 17.20% | HR for OS | 8 |
| Yun ZY | 2017 | China | 379 | 55.6 | Gastric cancer | NA | NA | NA | 6 |
| Zhang X | 2017 | China | 294 | 56 | Gastric cancer | 60 | 16.80% | HR for OS | 7 |
| Song X | 2017 | China | 206 | 57 | Colorectal cancer | 52 | 17.35% | HR for OS | 7 |
| Gunaldi M | 2016 | Turkey | 269 | 59.4 | Gastric cancer | 14.04 | 16.65% | HR for OS | 7 |
| Wang L | 2015 | China | 168 | 61 | Pancreatic adenocarcinoma | 48 | 14.15% | HR for OS | 7 |
| Okuturlar Y | 2015 | Turkey | 178 | 53.8 | Breast cancer | NA | NA | HR for OS | 6 |
HR – hazard ratio; OS – overall survival; NOS – Newcastle-Ottawa quality assessment scale; NA – not available.