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In human endometrium insulin-like growth factor binding protein (IGFBP)-1 inhibits the mitogenic action of insulin-like growth factor (IGF)-I by inhibiting the binding of IGF-I to its receptor. Our purpose was to compare circulating levels of IGF-I and IGFBP-1 in women with and without endometrial cancer. We assessed circulating levels of IGF-I and IGFBP-1 and IGFBP-3 in 23 patients with endometrial cancer, 11 patients with uterine cervical cancer and 27 healthy control women. The mean circulating level of IGF-I decreased significantly following menopause but was not correlated with age in the control group. The body mass index was significantly higher in the endometrial cancer group than in the control group. Analysis of covariance showed that even after the data were adjusted to eliminate the influence of the body mass index, the circulating IGF-I concentration was higher in postmenopausal endometrial cancer patients than in postmenopausal control subjects. The mean circulating level of IGFBP-1 was significantly lower in postmenopausal cancer patients than in postmenopausal control subjects. There were no significant differences in the serum levels of IGF-I and IGFBP-1 in the patients with cervical cancer and the control group. In conclusion, an increased circulating concentration of IGF-I and a decreased circulating concentration of IGFBP-1 are associated with endometrial cancer especially in postmenopausal women.

endocrine journal

Increased Circulating Levels of Insulin-Like Growth Factor-I and Decreased Circulating Levels of Insulin-Like Growth Factor Binding Protein-1 in Postmenopausal Women with Endometrial Cancer.