Breast cancer. Relationship to thyroid supplements for hypothyroidism

Abstract

This study was undertaken to determine the relationship between thyroid supplements and breast cancer. The incidence of breast cancer among patients who received thyroid supplements was 12.13%, while in the control group it was 6.2%. The incidence rate of breast cancer was 10%, 9.42% and 19.48% among patients who received thyroid supplements for 1-5, 5-15 and for more than 15 yr, respectively. The incidence of breast cancer among nulliparous women who received thyroid supplements was 33%, while in nulliparous women without thyroid supplements the incidence was only 9.25%. Even in a specific age group, the incidence rate of breast cancer was higher among patients receiving thyroid supplements, when compared to control patients in the same age group.