Breast cancer is still one of the leading causes of cancer death in women, but there has been a sustained decline in mortality rates over the last decades the relationship between breast cancer and thyroid diseases is controversial many works have been done in past also. The relation between autoimmune and non-autoimmune thyroid diseases has been investigated in patients with breast cancer and age-matched control individuals without breast or thyroid disease. Determination of serum thyroid hormone and antibody levels was done in 100 breast cancer patients and 75 control individuals. The mean values for thyroid hormones and anti-thyroid peroxidase antibodies were significantly higher in breast cancer patients than in control individuals. Our results indicate an increased prevalence of autoimmune and non-autoimmune thyroid diseases in breast cancer patients. Keywords: breast, cancer, autoimmune thyroid diseases
