Conclusion
In conclusion, the meta-analysis suggested that a higher BW was relative to a higher risk of overall cancer. And BW had a dose-response relationship with breast cancer and testicular cancer. Meanwhile, our MR analysis found that there was no obvious casual association between BW and overall cancer. This suggested that BW was not an direct factor in cancer prevention. It’s still a long way to go and more researches are needed to explore the potential mechanism between BW and the risk of cancers.