TNF receptor p55 and IL-8₇₂ and IL-8₇₇ isoforms: blood and urine levels in breast cancer patients

Abstract

In the preliminary study reported here, 37 patients with breast cancer and 10 healthy volunteers were analyzed for soluble TNF-R p55 and two variants of IL-8 consisting of 72 and 77 amino acid residues (IL-8₇₂ and IL-8₇₇, respectively) in their blood and urine with novel ELISA test systems. The clinical/prognostic values of determining these inflammatory cytokines at different stages of the cancer process appeared to depend on the treatment course being evaluated. In contrast to expectations, it was noted that there was a stabile tendency for decreased TNF-R p55 and IL-8₇₂ levels in the plasma and urine of breast cancer patients as compared with levels observed with healthy controls. Moreover, patients that underwent polychemotherapy treatments were notable for significant decreases in IL-8₇₂ and TNF-R p55 levels in their blood plasma; these findings contrasted with significant increases in these parameters in these patients’ urine. Interestingly, the IL-8₇₇ isoform that now appeared both in the urine and plasma of patients was not detectable before initiation of the polychemotherapy. In spite of all these findings, individual fluctuations among these parameters still do not allow us to establish, at this time, any strong correlations between these values with any particular breast cancer stage or a type of treatment. Nonetheless, while the results here are preliminary, they demonstrate that testing for TNF-R, along with IL-8 isoforms, in the blood plasma and urine could potentially present a valid means for monitoring of the overall immune and disease progress/remission status in breast cancer patients. Ongoing studies with larger patient sample sizes, as well as collecting and analyzing samples at multiple timepoints—to minimize the potential influence of any inherent variability in cytokine levels in humans—will hopefully allow us to specify what these preliminary results reported here suggest, i.e., the potential utility of this experimental approach for determining disease progression or efficacy of treatment in cancer patients.

Keywords::

• Tumor necrosis factor
• interleukin-8
• breast cancer

Acknowledgments

The study was supported by the Government Found of Fundamental Investigations of Ukraine, Grant #ф14/296-2007 and Belarusian Republican Foundation for Fundamental Research, Grant B-07-K-052.

Declaration of interest: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.