Circulating IL-1β levels, polymorphisms of IL-1B, and risk of cervical cancer in Chinese women

Long-term human papillomavirus (HPV) infection is a prerequisite for cervical cancer. IL-1β and IL-1Ra expression levels play an important role in cervical carcinogenesis. Several functional genetic variants in IL1B and IL-RN have been reported to be associated with IL-1β expression and cancer susceptibility. In the current study, we hypothesized that plasma IL-1β levels, IL-1B and IL-RN polymorphisms were candidate biomarkers for cervical cancer.

We measured plasma IL-1β levels and genotyped IL-1B and IL-RN polymorphisms in a case–control study of 404 cervical cancer cases and 404 controls in Chinese women.

The mean plasma IL-1β levels in cervical cancer cases (42.19 ± 31.55 pg/ml) was significantly higher than those in controls (34.86 ± 22.68 pg/ml, P = 0.0002), and plasma IL-1β levels above the 75% quartiles in controls (IL-1β ≥ 46.94 pg/ml) were associated with a 1.74-fold significantly increased risk of cervical cancer [95% confidence interval (CI), 1.28–2.36], compared with those of lowest quartile. Multivariate logistic regression analyses revealed that the variant genotypes, IL-1B T-31C TC/CC and C-511T CT/TT, were associated with a significantly increased risk of cervical cancer [adjusted odds ratio (OR), 1.60; 95% CI, 1.16–2.21 for −31TC/CC, and adjusted OR, 1.52; 95% CI, 1.10–2.09 for −511CT/TT, respectively), especially among subjects having higher levels of IL-1β. However, IL-RN VNTR polymorphism was not associated with cervical cancer risk in the current study. Furthermore, the significant differences of IL-1β concentration between cervical cancer cases and controls were observed only among subjects carrying T-31C or C-511T variant genotypes.