Key clinical point: Further studies are needed to assess the association between untreated subclinical hypothyroidism and the risks of different types of cancer.

Major finding: Subclinical hypothyroidism was associated with an increased risk of colorectal and thyroid cancer incidence and cancer-related mortality.

Study details: A systematic review of nine studies.

Disclosures: Dr. Yu and two coauthors have received salary awards from the Fonds de recherche du Québec–Santé.