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Demographics and tumor characteristics of included studies in the systematic review and meta-analysis.
| Authors | Feng et al. | Tran et al. | Armstrong et al. |
|---|---|---|---|
| Total patients | 149 | 387 | 361 |
| Patients taking metformin (%) | 42 (28) | 46 (12) | 19 (5) |
| Mean age (years) | 69.6 | 60.6 | ND |
| Male (%) | 80 (54) | 180 (47) | ND |
| Caucasian (%) | 81 (54) | ND | ND |
| Mean length of observation (months) | 30.6 | 30.8 | ND |
| Mean initial tumor size (mm) | 8 | 11.9 | ND |
| Tumor growth (%) | 65 (44) | 216 (56) | 319 (88) |
