title: STUDY OF THE PREVALENCE OF AUTOIMMUNE THYROID DISEASE IN WOMEN WITH BREAST CANCER.
abstract: OBJECTIVE
  The aim of this study was to analyze the prevalence of thyroid disorders in patients with a positive biopsy for breast cancer prior to specific antitumor treatment.
  
  
  METHODS
  The frequency and pattern of thyroid disorders were evaluated in 112 patients with breast cancer (G1) and 125 control patients (G2) by analyzing serum thyroid-stimulating hormone (TSH), anti-thyroid peroxidase antibodies, and anti-thyroglobulin antibodies. In addition, the expression of estrogen receptors, progesterone receptors, and human epidermal growth factor receptor 2 (HER2) was assessed in the breast biopsies by immunohistochemistry.
  
  
  RESULTS
  The frequency of thyroid disorders, such as changes in TSH levels and/or the presence of thyroid antibodies, was not different between the 2 groups examined (30.4% in G1 versus 28.0% in G2) (P = .69). However, a family history of thyroid disease was more frequent in patients with breast cancer (50.5% in G1 versus 28.2% in G2) (P = .001). Regarding the clinical stage of breast cancer, there was no difference between women with autoimmune thyroiditis and those without thyroid dysfunction (P = .316). Similarly, there were no differences in hormone receptor (estrogen or progesterone) and HER2 expression between patients who tested positive and those who tested negative for anti-thyroid antibodies (P = .052 and P = .549, respectively).
  
  
  CONCLUSIONS
  The data obtained in this study did not reveal a higher frequency of autoimmune thyroid disease in patients with breast cancer compared to controls. A family history of thyroid disease was more common in those with breast cancer.
authors.forename: Paula Andréa V C J
authors.initials: PA
authors.lastname: Freitas
authors.forename: Gisele M
authors.initials: GM
authors.lastname: Vissoci
authors.forename: Rogério M
authors.initials: RM
authors.lastname: Pinto
authors.forename: Paula P
authors.initials: PP
authors.lastname: Lajolo
authors.forename: Paulo T
authors.initials: PT
authors.lastname: Jorge
mesh_terms: D000328:Adult; D000368:Aged; D001938:Brazil / Q000453:epidemiology; D001943:Breast Neoplasms / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology*; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D008327:Mammography; D008875:Middle Aged; D015995:Prevalence; D013960:Thyroid Function Tests; D013967:Thyroiditis, Autoimmune / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology*; D016217:Ultrasonography, Mammary