Association between metabolic dysfunction-associated steatotic liver disease and risk of thyroid cancer: a systematic review and meta-analysis.

Several studies have reported associations between metabolic dysfunction-associated steatotic liver disease (MASLD) and the risk of various cancers. However, studies focusing specifically on the association between MASLD and thyroid cancer are relatively limited, and the conclusions drawn, thus, far remain inconclusive. In response, we conducted a meta-analysis of relevant cohort studies to clarify the association between MASLD and the risk of thyroid cancer. We systematically searched the Web of Science, Embase, Cochrane Library, and PubMed databases for articles published before 24 September 2024. We utilized the R software (version 4.4.1) for the comprehensive execution of all statistical analyses. Our meta-analysis included eight cohort studies (six retrospective and two prospective), comprising 18 925 396 participants. The pooled results of the eight cohort studies indicate that MASLD is linked to an increased risk of thyroid cancer (HR = 1.46; 95% CI: 1.14-1.86; I ² = 69%; P  < 0.01). A random-effects model was employed due to moderate heterogeneity ( I ² > 50%). Subgroup analyses revealed that the association between MASLD and thyroid cancer risk was stronger in the Chinese population (HR = 2.24; 95% CI: 1.32-3.81; I ² = 51%) and among overweight individuals (HR = 1.29; 95% CI: 1.02-1.63; I ² = 90%). No significant differences were identified between male and female subgroups. This meta-analysis demonstrates that MASLD increases the risk of developing thyroid cancer.