• Pain physician · Nov 2012

    IL-7, IL-18, MCP-1, MIP1-β, and OPG as biomarkers for pain treatment response in patients with cancer.

    • Ellen Heitzer, Andreas Sandner-Kiesling, Walter Schippinger, Imke Stohscheer, Ingrid Osprian, Sarah Bitsche, Florian Eisner, Juliane Verebes, Günter Hofmann, and Hellmut Samonigg.
    • Institute of Human Genetics, Medical University of Graz, Graz, Austria.
    • Pain Physician. 2012 Nov 1;15(6):499-510.

    BackgroundPain is one of the most common symptoms in patients suffering from advanced cancer and receiving palliative care and is often responsible for a poor quality of life. To date, there exists no published correlation between biological, measurable biomarkers and pain intensity.ObjectivesThe primary objective was to search and identify pain-associated cytokines (biomarkers) correlating with changes in numeric rating scale (NRS) pain scores in patients with cancer before and after pain treatment. The secondary objectives were to assess cytokine serum level differences between patients and healthy controls and to evaluate possible relationships between pain entities, pain intensity (in NRS), gender, location of primary tumor, and the patients' cytokine baseline concentrations.Study DesignControlled, prospective study.SettingUniversity medical center.MethodsEligible patients with exacerbated cancer-related pain (NRS = 5) and healthy controls with no pain were included. Serum level changes of 19 cytokines were analyzed before and during opioid treatment.ResultsOf 19 analyzed biomarkers, 5 (IL-7, IL-18, MCP-1, MIP-1α, MIP-1β and OPG) turned out to correlate significantly with pain relief. In healthy controls, all analyzed cytokines showed no significant differences. In the secondary analysis, only one significant correlation was detected between OPG and pain entities. Furthermore, IL-4, IL-7, IFN-γ and OPG appeared to account for the ability to predict a patient's gender.LimitationsOur findings should be considered as preliminary and need to be confirmed in further studies.ConclusionOur results provide preliminary evidence of a significant correlation of pain relief in patients with cancer and at least 5 cytokines. These biomarkers may serve as the basis for development of diagnostic tools for pain assessment and could serve as potential new targets for pain control.

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