XRCC3 and thyroid cancer: This meta-analysis aimed to clarify the associations between XRCC3 polymorphisms and thyroid cancer risk, with emphasis on variant- and ethnicity-specific effects.<h4>Methods</h4>A systematic search of PubMed, EMBASE, Scopus, CNKI, and other databases up to July 10, 2025 identified case-control studies reporting genotype distributions of XRCC3 polymorphisms in thyroid cancer.