Decreased IL-1 RA concentration in ascites is associated with a significant improvement in overall survival in ovarian cancer.

BACKGROUND

Cytokines play a major role in promoting the growth and metastatic spread of cancer cells. Interleukin-1 alpha and beta (IL-1) and IL-1 RA are known to be critically involved in carcinogenesis and in various solid tumors. There are limited data on expression of IL-1 alpha, beta and RA in serum and ascites in patients with advanced ovarian cancer. Objectives of this study were to investigate the level of IL-1 alpha, IL-1 beta and IL-1 RA in serum and ascites from patients with ovarian cancer and their impact on the prognosis.

METHODS

Fifty-three women with ovarian cancer (OC) (33 patients with primary OC and 20 with relapsed OC) and 50 women with benign gynaecological diseases as a control group (CG) were enrolled onto this prospective study. IL-1 alpha, beta and RA levels were analyzed in serum and ascites by ELISA technique.

RESULTS

The median age was 55 years (range 19-80) in the ovarian cancer group and 40 years (range 15-89) in the controls. The distribution of histological type of ovarian cancer was as follows: serous-papillary 43 (81.1%), 4 (7.5%) mucinous, 3 (5.7%) endometroid and 3 (5.7%) clear cell carcinoma. The concentrations of IL-1 beta and RA in ascites or peritoneal fluid were significantly increased in patients with OC in comparison to the CG, for both cytokines (p<0.0001); also the concentration of IL-1 RA in serum was increased in OC (p=0.003) vs. CG. An increased level of IL-1 beta in ascites correlated significantly with a poorer histopathological grading (p=0.038). IL-1 RA concentration in ascites was correlated with advanced FIGO stage (p=0.049) and the IL-1 RA serum level with ascites volume (< or =500 ml vs. >500 ml) (p=0.046). Patients with IL-1 RA level in ascites lower than the cut off value of 695.6 pg/ml showed a significant better progression-free median survival (24.6 vs. 12.8 months, p=0.008) and postoperative median overall survival (34.6 vs. 17 months, p=0.01) in comparison to patients with an IL-1 RA level in ascites higher than the cut off level. Additionally, a higher expression of IL-1 beta in serum (p=0.004) and ascites (p=0.05) reduced significantly the progression-free survival. In the multivariate analysis, expression of IL-1 RA in ascites was an independent prognostic factor for good progression-free and postoperative overall survival (HR, 0.39 95% CI, 0.18-0.83, p=0.01, HR, 0.36 95% CI, 0.16-0.8, p=0.01).

CONCLUSIONS

IL-1 RA levels in ascites lower than the cut off value of 695.6 pg/ml are associated with a significant improvement in postoperative and progression-free survival. IL-1 RA shows a prognostic relevance in ovarian cancer.