Hyperthyroidism treatment linked with cancer
Radioactive iodine therapy raises cancer mortality later in life, extended study shows
2nd July 2019
Treatment of hyperthyroidism with radioactive iodine is associated with increased cancer mortality later in life, including breast cancers, latest findings show.
US researchers extended the follow-up of the Cooperative Thyrotoxicosis Therapy Follow-up Study of more than 35,000 patients with hyperthyroidism enrolled between 1946 and 1964 by a maximum of 68 years.
The initial study found no raised total or site-specific cancer mortality rates through to 1990 in patients treated with radioactive iodine compared with the general