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Background: The paraoxonase1 gene (PON1) is part of the paraoxonase family of multifactorial antioxidants (EC 3.1.1.2). The functional single-nucleotide polymorphisms L55M and Q192R are located in the coding site of this gene. The association between these polymorphisms and breast cancer risk has been investigated, with contradictory results. Objectives: A meta-analysis was done to find the association between PON1 (L55M and Q192R) gene polymorphisms and breast cancer risk. Methods: We searched Embase, Pubmed, and Web of Science for related articles. Twelve eligible studies before December 2021 were selected. Statistical analysis was done by STATA 14.0. Result: We summarized 12 studies of L55M and Q192R polymorphisms and breast cancer risk, involving 5,769 subjects (2,519 controls and 3,250 patients). In all genetic models, PON1-L55M polymorphisms were significantly associated with breast cancer risk. Besides, PON1-Q192R polymorphisms decreased breast cancer risk. The PON1-Q192R allele reduced the cancer risk, particularly breast cancer (OR (R vs. Q): 0.7932). However, an association was found between the PON1-L55M allele and increased breast cancer risk (OR (M vs. L): 1.6041). Discussion: The results of 11 out of 12 studies were consistent with our results. In a non-conforming study, this was probably due to errors in conducting experiments. Nonetheless, well-designed studies with more samples are needed to confirm our findings at protein levels.

Association Between Paraoxonase1 (Q192R and L55M) Gene Polymorphisms and Risk of Breast Cancer: A Meta-analysis of 12 Studies