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. 2023 Dec 6;15:252. doi: 10.1186/s13098-023-01218-3

Fig. 1.

Fig. 1

Overview of the study design. A We firstly applied two-sample MR analyses to figure out the genetic effect of metformin use on 26 prevalent cancers with five robust methods. B Two-step MR analysis and MVMR were further conducted to figure out the potential mediator who mediate the protective genetic effect of metformin on HER-positive breast cancer