Table 1. General information of included studies.
| Author | Year | Source | Publication type | Nationality | Affiliation | Study design | Quality of study by NOSa | No. of T1ab |
|---|---|---|---|---|---|---|---|---|
| Rodrigues | 2013 | Ann Oncol | Full article | France | 8 centers | Retrospective | High | 252 |
| Tognela | 2015 | Clin Breast Cancer | Full article | Australia | 4 centers | Retrospective | High | 46 |
| Olszewski | 2013 | Breast Cancer Res Treat | Full article | USA | Brown University, Beth Israel MC | Retrospective | High | 205 |
| Fehrenbacher | 2014 | J Clin Oncol | Full article | USA | KPNC database | Retrospective | High | 234 |
| Mcarthur | 2011 | Cancer | Full article | USA | MSKCC | Retrospective | High | 99 |
| Gori | 2015 | PLoS One | Full article | Italy | 25 centers | Retrospective | High | 303 |
| Horio | 2012 | Int J Clin Oncol | Full article | Japan | Aichi Cancer Center | Retrospective | High | 42 |
a, studies with a score ≥7 were regarded as high quality and those with a score of 4–6, as medium quality. NOS, Newcastle-Ottawa scale; KPNC, Kaiser Permanente Clinical Care Program of North California; MSKCC, Memorial Sloan Kettering Cancer Center; MC, medical center.