The effect of melatonin on appetite and other symptoms in patients with advanced cancer and cachexia: A double-blind placebo-controlled trial.

Abstract

9062 Background: Patients with advanced cancer experience anorexia and weight loss which impairs their quality of life. Prior studies suggest melatonin, a frequently used integrative medicine may attenuate weight loss, anorexia, fatigue, and depression. These studies were limited by a lack of blinding and absence of placebo controls. The primary objective of this study was to compare melatonin to placebo for appetite in patients with cachexia. Methods: A randomized, double-blind, 28 day trial of melatonin 20mg vs. placebo in patients with advanced lung or gastrointestinal cancer, appetite scores >3 on a 0 to 10 scale (10 = worst appetite) and a history of weight loss ≥ 5% within 6 months. Patients unable to maintain oral intake, thyroid or adrenal dysfunction, or with a karnofsky <40 were excluded from the study. The assessments included weight, symptom severity by Edmonton Symptom Assessment Scale (ESAS) and quality of life by the Functional Assessment of Anorexia/Cachexia Therapy (FAACT).Differences between groups from baseline to day 28 were analyzed using one-sided two sample t tests (appetite, pain and well-being) or Wilcoxon two-sample tests for the other variables. Interim analysis at half point had a Lan-DeMets monitoring boundary with an O’Brien-Fleming stopping rule. The decision boundaries for the interim test was to accept the null hypothesis of no treatment difference (futility) if the test statistic Z < 0.39 (p ≥ 0.348). Results: After interim analysis of 48 patients, the study was closed by the Data Safety Monitoring Board for futility. There were no significant differences between groups in appetite (p=0.78), weight (p= 0.17), FAACT score (p=0.95), insomnia (p=0.62) or other symptoms measured by the ESAS from baseline to day 28.No significant toxicities were observed. Conclusions: In cachectic patients with advanced cancer, 20mg oral Melatonin at night does not improve appetite, weight or quality of life compared to placebo.