Abstract
Iodine prophylaxis was introduced to the moderately severe goitre endemic area in Salta, Argentina, in 1963. All thyroidectomies from a 20 year period were reviewed, and 148 thyroid malignancies carefully studied. The period from 5 to 15 years after iodization was associated with a lower frequency of follicular carcinomas and a higher frequency of papillary carcinomas than the period before and up to 5 years after prophylaxis. Lymphoid infiltration in the non-tumorous thyroid was relatively infrequent before iodine prophylaxis: it was much higher in each of the post-prophylaxis periods. These results, in agreement with other studies, support the view that an increased iodine intake is associated with an increased incidence of papillary carcinoma of the thyroid and thyroiditis.
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