Interactions dietary components with expression level of breast cancer-related genes

Background Dietary components can influence the effects of genetic background in breast cancer (BC). This review study aimed to investigate the effect of dietary components on the expression level of BC-related genes. Methods In this narrative review, Embase, PubMed, PsycInfo, and the Cochrane databases were used to collect the related papers with interactions of BC, genetics, and dietary intake. Appropriate keywords such as BC, gene expression, mutation, nutrient, and diet (alone and together) were applied for data collection. Results The association of BC with some genes including the BC1 gene ( BRCA1 ), the human epidermal growth factor receptor 2 ( HER2 ), and the fat mass and obesity-associated ( FTO ) gene can be affected by dietary components. Moderate B12 supplementation may be protective against BC in people with the inherited mutation of BRCA . The olive oil may have a protective effect against BC through several mechanisms such as suppressing HER-2 expression. Furthermore, high glycemic index foods may increase the risk of BC by the activation of the phosphoinositide 3-kinase/protein kinase B (PI3K/AKT) pathway and the up-regulation of FTO gene expression. Conclusion There are interactions between BC, BC-related genes, and dietary intake. Dietary components such as macronutrients, micronutrients, and phytochemicals may regulate the expression level of BC-related genes. Further longitudinal studies are needed to confirm the associations between BC-related genes and diet and to discover the underlying mechanisms.