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Tamoxifen reduces serum insulin-like growth factor I (IGF-I)

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Summary

Antiestrogens are widely used in the management of hormonally responsive breast cancer in both adjuvant and palliative settings, and are currently being evaluated as chemopreventive agents. The classical mechanism of action of these drugs involves inhibition of estrogen-stimulated neoplastic cell proliferation by blockade of estrogen receptors present on breast cancer cells. This paper reviews recent clinical and laboratory data that suggest that the commonly used antiestrogen tamoxifen also acts to reduce serum IGF-I levels. Estrogens appear to play a permissive role in growth hormone (GH) release by the pituitary gland and GH is known to stimulate IGF-I expression by hepatocytes. It is therefore possible that blockade of estrogen receptors in the hypothalamic-pituitary axis by tamoxifen interferes with GH release, leading to reduced hepatic IGF-I expression. In view of results suggesting that IGF-I is a more potent mitogen than estradiol for breast cancer cells and data demonstrating a positive correlation between estrogen receptor level and IGF-I receptor level of breast cancer cells, the IGF-I lowering effect of tamoxifen may contribute to the cytostatic activity of the drug. The interrelationships between steroid hormone physiology and IGF-I physiology may have relevance to a variety of commonly used treatments for hormonally responsive cancers.

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  1. McGill University and Lady Davis Research Institute of the Jewish General Hospital, 3755 Cote St Catherine, H3T 1E2, Montreal, PQ, Canada

    Michael N. Pollak MD (FRCPC), Hung The Huynh PhD & Susan Pratt Lefebvre BSc

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Pollak, M.N., Huynh, H.T. & Lefebvre, S.P. Tamoxifen reduces serum insulin-like growth factor I (IGF-I). Breast Cancer Res Tr 22, 91–100 (1992). https://doi.org/10.1007/BF01833337

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