Table 2. Characteristics of the patients enrolled in the included studies.
| Study | age | Grade | Node status | tumor size (cm) | stage | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| <50 | >50 | 1+2 | 3+4 | 0 | positive | negative | unknown | <2 | >2 | unknown | 1 | 2 | 3 | 4 | 0 | |
| Dong 2014 | 36.0 | 36.0 | 33 | 39 | 0 | 35 | 37 | 0 | 13 | 59 | 0 | 33 | 39 | 0 | ||
| Gasparin 2014 | 74.0 | 86.0 | 15 | 142 | 3 | 58 | 93 | 9 | - | - | - | - | - | - | ||
| Toyama 2012 | 21.0 | 37.0 | 19 | 39 | 0 | 40 | 17 | 1 | 15 | 43 | 0 | - | - | - | ||
| MacKenzie 2014 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | ||
| Yu 2014 | 58.0 | 60.0 | 104 | 4 | 0 | 47 | 51 | 20 | 74 | 43 | 1 | 84 | 34 | 0 | ||
| Tang 2014 | 29.0 | 22.0 | 30 | 21 | 0 | 18 | 33 | 0 | 27 | 24 | ||||||
| Shinden 2015 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | ||
| Liu 2015 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | ||
| Yu 2015 | 51.1 (31.0–73.0) | 15 | 15 | 0 | 13 | 17 | 0 | 28 | 2 | 0 | 24 | 6 | 0 | |||
| Liu 2015 | 51.6 (26.1–174.3) | 191 | 263 | 2 | - | - | - | - | - | - | 396 | 47 | 13 | |||
| Kalniete 2015 | (27.0–78.0) | 4 | 39 | 7 | 15 | 35 | 0 | 13 | 37 | 0 | 31 | 19 | 0 | |||
| Sahlberg2014 | 60.0 | 14 | 25 | 1 | 18 | 22 | 0 | - | - | - | 27 | 13 | 0 | |||
| Sahlberg 2014 | 58.0 | 27 | 40 | 3 | 35 | 35 | 0 | - | - | - | 36 | 122 | 0 | |||
| Cascione2013 | 43.0 (20.0–50.0) | 7 | 74 | 5 | 30 | 50 | 6 | - | - | - | - | - | - | |||
| Shen 2014 | 46.5 (25.0–79.0) | 19 | 28 | 11 | 36 | 22 | 0 | 26 | 32 | 0 | - | - | - | |||