Five-year relative survival and determinants of excess mortality in patients with head and neck and thyroid cancers: A population-based study from Golestan province, Northern Iran.

Background: We aimed to assess relative survival (RS) and determinants of excess mortality rate in patients with head and neck squamous cell carcinomas (HNSCC) and thyroid cancer in Golestan province, Northern Iran.

Methods: We recruited new primary HNSCC and thyroid cancer cases from Golestan, 2006-2016. Five-year age-standardized RS with their 95% confidence intervals (CIs) were calculated.