Cohort study of risk factors for breast cancer in post menopausal women.

A study using National Cancer Institute's Surveillance, Epidemiology, and End Results data found a much lower risk of breast cancer associated with thyroid cancer, 1.21 [ 21 ], than in the present study Another study found that women who had been treated with radioactive iodine had a rate of breast cancer that was 90% greater than in the general population although this increase did not reach statistical significance at the p<0.05 level [ 22 ].

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Change in weight was not significant after adjusting for current weight although it was highly significant prior to this adjustment.

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