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. 2023 Feb 7;27(6):2843–2849. doi: 10.1007/s00784-023-04874-x

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© The Author(s) 2023

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Schematic design of a two-sample Mendelian randomization study of periodontitis and breast cancer. This design assumes a bidirectional association between periodontitis and breast cancer, but no association with confounders. Genetic variants can influence breast cancer through periodontitis and vice versa. SNP stands for single nucleotide diversity