Abstract
Background: Cancer pain is among the most common symptoms of cancer patients. Genetic differences in individuals with regard to opioid-receptor signaling create clinical difficulties for opioid treatment; consequently, useful predictive biomarkers are needed. There is also much research about a feeling side using Numerical rating scale (NRS) or in respect of emotions using Hospital anxiety and depression scale (HADS). However, little is known about the influence of individual cognition and an individual view.
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