Abstract
High levels of circulating insulin-like growth factor-I (IGF-I) and its major binding protein (IGFBP-3) at premenopausal ages have been associated with an increased breast cancer risk. We conducted a cross-sectional study (215 premenopausal women and 241 after natural menopause) nested within the Guernsey prospective studies to examine the relationship between the IGF system and mammographic features of the breast. The mammographically dense area in the breast increased with increasing serum levels of IGF-I (P for linear trend, Pt = 0.05), IGF-II (Pt = 0.08), and IGFBP-3 (Pt = 0.01) only in premenopausal women. IGF-II and IGFBP-3 serum levels were associated with increases in the mammographically lucent area in both premenopausal (Pt = 0.01 and 0.04, respectively) and postmenopausal women (Pt <0.001 for both), but these associations were no longer statistically significant after adjustment for body mass index and waist circumference. Neither the IGF-I/IGFBP-3 nor the IGF-II/IGFBP-3 molar ratio was associated with any of these mammographic features. The number of A alleles at a polymorphic locus in the promoter region of the IGFBP-3 gene was associated with increasing mean IGFBP-3 levels in both premenopausal (Pt = 0.01) and postmenopausal (Pt
Translated title of the contribution | The insulin-like growth factor system and mammographic features in premenopausal and postmenopausal women |
---|---|
Original language | English |
Pages (from-to) | 449 - 455 |
Number of pages | 7 |
Journal | Cancer Epidemiology, Biomarkers and Prevention |
Volume | 15 (3) |
DOIs | |
Publication status | Published - Mar 2006 |