Table 2.
The Heterogeneity Analysis of the Conducted Studies
| Cancer type | Number of included studies | I2 (%) | Q-test’s P value |
|---|---|---|---|
| Breast cancer | 19 | 97.48 | P<0001 |
| Colorectal cancer | 4 | 98.64 | P<0001 |
| Gastric cancer | 6 | 93.84 | P<0001 |
| Lung cancer | 9 | 84.53 | P<0001 |
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