Treatment of Cancer-related Pain

Direct inter-class efficacy comparisons do not make a differentiation between the relative effectiveness of opioids and NSAIDs that are administered through different routes to patients experiencing mild, moderate, or severe caner-related pain. NSAIDs are co-administered to achieve opioid dose-sparing, but this has not shown a consistently demonstrable decrease in side-effects. The heterogeneity of ongoing trials precludes meta-analysis in order to address most of the subquestions. A variation in analgesic effectiveness between NSAIDs was recorded only in a solitary retrieved trial. Similarly, the effectiveness of NSAIDs in comparison to “weak” opioids could not be determined in the retrieved trials. These trials, however, relatively enroll a small number of patients and record progress in intervals ranging from hours to days. Only rarely are patients tracked for 2 weeks or more. There are many examine drugs that are either not available in the United States or are not generally used to provide cancer pain relief, for example, pentazocine. Earlier efforts to substantiate such evidence by observing nonrandomized trials did not turn out to be useful. A specific randomized controlled trial assessed oral transmucosal fentanyl citrate for its applicability to breakthrough pain (through the use of a study design that relied on rescue doses of morphine) and confirmed its superiority to placebo. In another randomized study involving ambulatory cancer patients there was evidence of superior analgesic and quicker onset of relief (after administering oral transmucosal fentanyl citrate) in comparison to the general rescue drugs that these patients were using. The EPC did not find any randomized controlled trials that addressed analgesic effectiveness and safety of NSAIDs (as applicable to the cyclooxygenase-2 isozyme) for cancer pain treatment. Retrieved trials support use of both bisphosphonates and radiation therapy. Regrettably, studies that can demonstrate the best possible order of application of the several different types of pain control intervention options were not identified.

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