Analysis of the effect of serum interleukin-6 (IL-6) and soluble IL-6 receptor levels on survival of patients with colorectal cancer.

Jpn J Clin Oncol

Division of Hemato-oncology, Department of Internal Medicine, Chang Gung Memorial Hospital, and Chang Gung University, College of Medicine, 222 Maijin Road, Keelung, Taiwan.

Published: June 2010

Objective: The correlations of serum interleukin-6 and soluble interleukin-6 receptor concentrations with clinicopathological features and survival of patients with colorectal cancer were studied.

Methods: We measured the serum levels of interleukin-6 and soluble interleukin-6 receptor in 99 colorectal cancer patients at the Chang Gung Memorial Hospital, Taiwan. The interleukin-6 and soluble interleukin-6 receptor levels were tested for their association with each other, and with the clinical parameters and outcomes.

Results: Both interleukin-6 and soluble interleukin-6 receptor concentrations were significantly higher in colorectal cancer patients than in normal individuals. Unlike patients with serum interleukin-6 levels >10 pg/ml, who have increased carcinoembryonic antigen levels and shorter survival, serum soluble interleukin-6 receptor levels >800 pg/ml were found in patients with stages I-II and no regional lymph nodal invasion and appeared to be a positive prognostic factor for improved survival. Especially, patients with serum interleukin-6 <10 pg/ml and soluble interleukin-6 receptor >800 pg/ml lived significantly longer. Nonetheless, the multivariate analysis showed that only tumor-node metastasis stage, metastatic status and serum interleukin-6 level were independent prognostic factors, whereas the serum soluble interleukin-6 receptor level became marginally important for survival.

Conclusions: We suggest the clinical relevance of interleukin-6 and soluble interleukin-6 receptor for the survival of colorectal cancer patients. From a practical point of view, detection of the serum interleukin-6 level alone, rather than combined measurement of interleukin-6 and soluble interleukin-6 receptor, may be sufficient to independently predict survival in colorectal cancer patients.

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http://dx.doi.org/10.1093/jjco/hyq010DOI Listing

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