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Carnitine deficiency is reportedly associated with increased pain sensation in diabetes mellitus and fibromyalgia, but the association between serum carnitine concentration and cancer pain has not been fully elucidated. We investigated the incidence of carnitine deficiency in patients with cancer pain, and examined the effect of the patients' demographic and clinical characteristics on pain intensity and carnitine deficiency. The serum carnitine concentration was measured in 50 patients with cancer pain receiving non-steroidal anti-inflammatory drugs, but not opioids. Multivariate regression analysis was used to determine the association of carnitine concentration, pain intensity, age and gender with hemoglobin and C-reactive protein (CRP) concentrations. Carnitine deficiency was detected in 9 of the patients (18.0%) and found to be significantly correlated with an elevated CRP concentration (P=0.039). In conclusion, although there does not appear to be an association between carnitine deficiency and cancer pain, it may be affected by inflammation or infection.

Incidence of carnitine deficiency in patients with cancer pain: A pilot study