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Long-Term Effects of Fenretinide, a Retinoic Acid Derivative, on the Insulin-like Growth Factor System in Women with Early Breast Cancer¹

Division of Chemoprevention [A. D., A. G. G., S. D.], Laboratory Medicine Unit [H. J., M. T. S.], European Institute of Oncology, 20141 Milan; Unit of Medical Statistics and Biometry [R. M., L. M.], Unit of Controlled Clinical Trials [T. C.], Chemoprevention Unit [F. F., E. C.], Division of Clinical Oncology [M. G. D. M., G. D. P.], Istituto Nazionale Tumori, 20133 Milan; and Department of Endocrinology and Metabolic Sciences, University of Genoa, 16132 Genoa [A. B.], Italy

High insulin-like growth factor-I (IGF-I) levels are associated with an increased risk of breast cancer in premenopausal women. Because the synthetic retinoid fenretinide showed a beneficial effect on second breast cancers in premenopausal women in a Phase III trial, we studied its long-term effects on IGF-I levels. We measured, at yearly intervals for up to 5 years, the circulating levels of IGF-I, IGF binding protein (BP)-3, and their molar ratio in 60 subjects 50 years of age and 60 subjects >50 years of age allocated either to fenretinide or no treatment. In women 50 years of age, measurements of IGF-II, IGFBP-1, and IGFBP-2 were also performed. The associations between biomarkers and drug or metabolite plasma concentrations were also investigated. All biomarkers were relatively stable over 5 years in the control group. Compared with controls and after adjustment for baseline, treatment with fenretinide for 1 year induced the following changes: IGF-I, -13% [95% confidence interval (CI), -25 to 1%] in women 50 years of age and -3% (95% CI, -16 to 13%) in women >50 years of age; IGFBP-3, -4% (95% CI, -12 to 6%) in both age groups; IGF-I:IGFBP-3 molar ratio, -11% (95% CI, -22 to 1%) in women 50 years of age and 1% (95% CI, -11 to 16%) in women >50 years of age. These effects were apparently maintained for up to 5 years, although fewer samples were available as time progressed. No change in other IGF components was observed. Drug and metabolite concentrations were negatively correlated with IGF-I and IGF-I:IGFBP-3 molar ratio in women 50 years of age. Fenretinide induces a moderate decline of IGF-I levels in women 50 years of age. The association between IGF-I change and the reduction of second breast cancers in premenopausal women warrants further study.

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