Table 1.
General characteristics of included studies
| Study | Year | Country | Sample size | Treatment | Follow-up (months) | Method |
|---|---|---|---|---|---|---|
| Liu et al16 | 2011 | China | 79 | Surgery | NR | RT-PCR |
| Kim et al17 | 2012 | Korea | 133 | Surgery | 32.5 | IHC |
| Won et al18 | 2012 | Korea | 262 | Surgery | 65.1 | IHC |
| Karpathiou et al19 | 2013 | Greece | 115 | Surgery | 32 | IHC |
| Zhou et al20 | 2013 | China | 216 | Multiple | NR | IHC |
| Jiang et al21 | 2014 | China | 142 | Surgery | 31 | IHC |
| Lv et al22 | 2015 | China | 108 | Surgery | 30 | IHC |
| Wang et al23 | 2015 | China | 104 | Multiple | 48.5 | IHC |
Abbreviations: NR, not recorded; RT-PCR, reverse transcription polymerase chain reaction; IHC, immunohistochemistry.