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  Vol. 237 No. 14, April 4, 1977 TABLE OF CONTENTS
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Thyroid Supplementation for Hypothyroidism

An latrogenic Cause of Breast Cancer?

Piero Mustacchi, MD; Francis Greenspan, MD

JAMA. 1977;237(14):1446-1447.


Abstract

In four subpopulations grouped by varying durations of thyroid supplementation (none, one to five years, six to 15 years, and 15 years or more), breast cancer frequency correlated positively with attained age. The cancer experience of persons in the same age-group was relatively stable regardless of how long women took thyroid supplements. The present data support the provisional inference that breast cancer and duration of thyroid therapy are both age-dependent and question the belief that pretreatment with thyroid supplements increases the risk of breast cancer development. Relationship of these two variables can only be determined by prospective studies.

(JAMA 237:1446-1447, 1977)



Author Affiliations

From the Departments of International Health and Medicine and the G. W. Hooper Foundation (Dr Mustacchi) and the Department of Medicine (Dr Greenspan), University of California, San Francisco.


Footnotes

Reprint requests to Department of International Health, University of California, San Francisco, CA 94143 (Dr Mustacchi).



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