Serum levels of insulin-like growth factor-I, IGF-binding protein 1 and 3, and insulin and endometrial cancer risk.
Insulin-like growth factor-I (IGF-I) and IGF-binding protein-1 and 3 (IGFPB-1, IGFPB-3) are expressed in normal and neoplastic endometrium. Their role and the role of insulin in the aetiology of endometrial cancer, is unclear. We performed a population-based case-control study in Sweden, including 288 endometrial cancer patients and 392 control women and analysed total serum IGF-I, IGFBP-1, IGFBP-3, insulin and BMI levels stratified by disease and hormone replacement therapy status (HRT). Non-parametric statistical tests and logistic regression analyses were performed to assess associations with endometrial cancer. There were no substantial differences between the mean serum levels of IGF-I between cases (115.5, s.d. 61.3) and controls (110.6; s.d. 50.4; Wilcoxon P=0.84), or between subgroups of women classified according to other risk factors for endometrial cancer. There were no trends of increasing risk according to quartiles of IGF-I, IGFBP-1, IGFBP-3 and insulin serum levels. There was an increasing risk of endometrial cancer according to the serum levels of IGFBP-1, which was observed only among women who had ever used HRT. Serum IGF-I, IGFBP-1, IGFBP-3 and insulin levels seem unrelated to endometrial cancer risk. Among users of HRT, increasing IGFBP-1 levels seem to increase endometrial cancer risk.
Weiderpass
E
E
Unit of Firld and Intervention Studies, International Agency for Research on Cancer, 150 Cours Albert Thomas, F-69372 Lyon Cédex 08, France. weiderpuss@iarc.fr
Brismar
K
K
Bellocco
R
R
Vainio
H
H
Kaaks
R
R
D000367:Age Factors; D000368:Aged; D015992:Body Mass Index; D016022:Case-Control Studies; D003276:Contraceptives, Oral / Q000009:adverse effects; D016889:Endometrial Neoplasms / Q000097:blood* / Q000209:etiology; D005260:Female; D020249:Hormone Replacement Therapy / Q000009:adverse effects; D006801:Humans; D007328:Insulin / Q000097:blood*; D018970:Insulin-Like Growth Factor Binding Protein 1 / Q000097:blood*; D018972:Insulin-Like Growth Factor Binding Protein 3 / Q000097:blood*; D036341:Intercellular Signaling Peptides and Proteins / Q000097:blood*; D008875:Middle Aged; D012307:Risk Factors; D013548:Sweden
D003276:Contraceptives, Oral; D007328:Insulin; D018970:Insulin-Like Growth Factor Binding Protein 1; D018972:Insulin-Like Growth Factor Binding Protein 3; D036341:Intercellular Signaling Peptides and Proteins; C065700:myotrophin