Table 1. Characteristics of included studies.
| No. of Studies | Author | Year | Country | Cases (n) | Method | Antibody Dilution | Cut-off Value | Positive Percentage |
|---|---|---|---|---|---|---|---|---|
| 1 | Chen[14] | 2016 | China | 101 | IHC | 1:100 | 5 score | 57.8% |
| 2 | Zhang[15] | 2016 | China | 94 | IHC | NA | 10% | 53.2% |
| 3 | Yang[16] | 2015 | China | 20 | ISH | - | - | 55.0% |
| 4 | Zheng[17] | 2014 | China | 98 | IHC | NA | 50% | 77.6% |
| 5 | Qi[18] | 2014 | China | 96 | IHC | NA | 2 score | 68.8% |
| 6 | Liu[19] | 2014 | China | 65 | IHC | 1:200 | 3 score | 64.5% |
| 7 | Wang[20] | 2014 | China | 121 | IHC | 1:200 | 10% | 79.3% |
| 8 | Yan[21] | 2013 | China | 50 | IHC | 1:500 | 3 score | 88.0% |
| 9 | Feng[22] | 2012 | China | 70 | IHC | NA | 2 score | 74.3% |
| 10 | Ouyang[23] | 2011 | China | 54 | IHC | 1:50 | 10% | 61.1% |
| 11 | Rong[24] | 2006 | China | 85 | IHC | 1:150 | 0% | 75.3% |
| 12 | Ma[25] | 2005 | China | 32 | ISH | - | - | 68.8% |
Abbreviations: IHC = immunohistochemistry, ISH= in situ hybridization, NA= not available.