Since body mass index (BMI) is a convincing risk factor for breast cancer, it is speculated to be associated with lymph node metastasis. However, epidemiological studies are inconclusive. Therefore, this study was conducted to investigate the effect of BMI on the lymph node metastasis risk of breast cancer. | Body mass index increases the lymph node metastasis risk of breast cancer A doseresponse meta-analysis with 52904 subjects from 20 cohort studies