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| First author | Year | Origin | Sample size (case) | Quantitative method | Language |
|---|---|---|---|---|---|
| Ren F | 2015 | China | 339 | IHC | English |
| Lu S | 2015 | China | 225 | IHC | English |
| Yao Y | 2014 | China | 40 | IHC | English |
| Wang B | 2014 | China | 104 | RT-PCR | Chinese |
| Sun S | 2012 | China | 67 | IHC | English |
| Zhou Z | 2011 | China | 328 | IHC | Chinese |
| Song L | 2009 | China | 200 | IHC | English |
Note: IHC: immunohistochemistry;
RT-PCR: reverse transcription-Polymerase Chain Reaction.
