Lower vitamin D levels were associated with thyroid cancer
A meta-analysis found lower blood vitamin D and more deficiency among thyroid cancer patients, but cannot show whether vitamin D changes cancer risk.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Thyroid cancer patients had lower blood vitamin D levels and more frequent vitamin D deficiency than controls in the pooled analysis. These are associations, not evidence that low vitamin D causes thyroid cancer. The review also does not establish that raising vitamin D levels or taking supplements prevents the disease.
Sampling season contributed to differences between studies. The authors also highlighted measurement timing, control selection and testing methods; the abstract does not establish whether low vitamin D preceded thyroid cancer.
What researchers found
Blood vitamin D concentration
Thyroid cancer patients versus controls, expressed as a standardized mean difference. Sampling timeframes were not fully described; the estimate is not an absolute concentration difference.
The result concerns a measured association
The studies compared vitamin D measurements and deficiency between cancer cases and controls. That question differs from testing a supplement. The pooled result cannot determine whether changing vitamin D would change a person's chance of developing thyroid cancer.
Measurement circumstances mattered
Season was identified as an important source of variation in results. The postoperative-measurement subgroup did not show a significant difference, unlike most subgroups. This exception adds uncertainty about how measurement timing affects the observed relationship.
The original publication
Association between vitamin D serum levels and thyroid cancer: a meta-analysis.
Yang L, Yun P, Li F
Front Endocrinol (Lausanne) · 2025
- PubMed ID
- 40778274
- Record checked
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