Evaluation of thyroid gland as an organ at risk after breast cancer radiotherapy: a systematic review and meta-analysis

• L. Darvish ^[1] ; M. Ghorbani ^[2] ; S. Hosseini Teshnizi ^[3] ; N. Roozbeh ^[1] ; F. Seif ^[4] ; M. Reza Bayatiani ^[4] ; C. Knaup ^[6] ; A. Amraee ^[5]
  1. [1] Hormozgan University of Medical Sciences

     Hormozgan University of Medical Sciences

     Irán

     
  2. [2] Shahid Beheshti University of Medical Sciences

     Shahid Beheshti University of Medical Sciences

     Irán

     
  3. [3] Shiraz University of Medical Sciences

     Shiraz University of Medical Sciences

     Irán

     
  4. [4] Arak University of Medical Sciences

     Arak University of Medical Sciences

     Irán

     
  5. [5] Iran University of Medical Sciences

     Iran University of Medical Sciences

     Irán

     
  6. [6] Comprehensive Cancer Centers of Nevada, Estados Unidos

  Mostrar afiliaciones +
• Localización: Clinical & translational oncology, ISSN 1699-048X, Vol. 20, Nº. 11 (November 2018), 2018, págs. 1430-1438
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Background Radiotherapy can often lead to thyroid dysfunction. Some studies demonstrated that treatment of breast cancer by RT can expose thyroid gland to high doses of radiation. The aim of this systematic review is to evaluate consideration of thyroid gland as an organ at risk.

    Methods In this systematic review and meta-analysis to select initial studies, a comprehensive search by two independent reviewers was performed. Electronical databases following: Web of Science, Google Scholar, Scopus, PubMed, Elsevier, Embase, ProQuest and Persian databases such as Iranmedex, Magiran, and SID were searched. All searches were restricted to English language between 1985 and 2017. A random effect meta-analysis is applied to estimate pooled effect size across initial studies. Funnel plot with Egger’s test is used to assess potential publication bias.

    Results Totally, five studies (478 samples) were included in meta-analysis. The meta-analyses of result showed that thyroid gland is affected by radiotherapy significantly and the TSH increased after radiotherapy (z = 2.68, P = 0.007). The pooled estimate of difference mean for TSH was 0.90 (95% CI 0.24, 1.55). In studies among patients with breast cancer RT, hypothyroidism was reported more than other thyroid disorders. There was not showed possibility publication bias among studies (P > 0.05).

    Conclusion This study demonstrated that thyroid gland is affected by radiotherapy significantly and the TSH increased after radiotherapy. Protecting thyroid gland during radiation and follow-up of patients with breast cancer RT are suggested for the assessment of thyroid gland dysfunction.