Abstract
High levels of insulin-like growth factor (IGF)-I are reported to be associated with an increased risk of prostate cancer. On the other hand, the insulin-like growth factor binding protein-3 (IGFBP-3) may decrease the risk. We therefore investigated the influence of serum IGF-I and IGFBP-3 on prostate cancer risk in a casecontrol study nested within a large-scale cohort in Japan (the Japan Collaborative Cohort Study). Information on lifestyles and sera of the subjects were collected in 1988-90. Serum IGF-I, IGF-II and IGFBP-3 were measured in sera stored at -80oC by immuno-radiometric assay. In 13,508 male subjects of the cohort who donated sera, 40 cases and 120 controls (1:3 matched with age and survey area) were identified. Ages of the cases ranged from 59 to 79 years, with a mean of 69.8. Odds ratios (ORs) and 95% confidence intervals (CIs) were estimated for the highest and middle tertiles compared with the lowest in controls using a conditional logistic model. Nonadjusted ORs for the highest tertiles were 0.99 (95% CI, 0.34-2.91) for IGF-I (trend-P = 0.60), 1.91 (95% CI, 0.68-5.38) for IGFBP-3 (trend-P = 0.23), 1.73 (95% CI, 0.69-3.47) for IGF-II (trend-P = 0.23), and 0.67 (95% CI, 0.26-1.76) for the IGF-I/IGBP-3 ratio (trend-P = 0.83). Serum levels of IGF-I, IGF-II, IGFBP-3, or IGF-I/IGFBP-3 ratio were thus not thought to be associated with risk of prostate cancer.
Original language | English |
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Pages (from-to) | 57-62 |
Number of pages | 6 |
Journal | Asian Pacific Journal of Cancer Prevention |
Volume | 10 |
Issue number | SUPPL.1 |
Publication status | Published - 05-12-2009 |
All Science Journal Classification (ASJC) codes
- Epidemiology
- Oncology
- Public Health, Environmental and Occupational Health
- Cancer Research