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Biomed Res Int. 2015;2015:506327. doi: 10.1155/2015/506327. Epub 2015 Oct 20.

Systematic Review of the Use of Phytochemicals for Management of Pain in Cancer Therapy.

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Medical Scientist Training Program, Mayo Clinic, Rochester, MN 55905, USA.
Department of Anesthesiology, CH du Forez, 42600 Montbrison, France.
Mayo Graduate School, Mayo Clinic, Rochester, MN 55905, USA.
Department of Psychiatry & Psychology, Mayo Clinic, Rochester, MN 55905, USA.
Department of Anesthesiology, Mayo Clinic, Rochester, MN 55905, USA.


Pain in cancer therapy is a common condition and there is a need for new options in therapeutic management. While phytochemicals have been proposed as one pain management solution, knowledge of their utility is limited. The objective of this study was to perform a systematic review of the biomedical literature for the use of phytochemicals for management of cancer therapy pain in human subjects. Of an initial database search of 1,603 abstracts, 32 full-text articles were eligible for further assessment. Only 7 of these articles met all inclusion criteria for this systematic review. The average relative risk of phytochemical versus control was 1.03 [95% CI 0.59 to 2.06]. In other words (although not statistically significant), patients treated with phytochemicals were slightly more likely than patients treated with control to obtain successful management of pain in cancer therapy. We identified a lack of quality research literature on this subject and thus were unable to demonstrate a clear therapeutic benefit for either general or specific use of phytochemicals in the management of cancer pain. This lack of data is especially apparent for psychotropic phytochemicals, such as the Cannabis plant (marijuana). Additional implications of our findings are also explored.

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