The Efficacy of Medical Marijuana in the Treatment of Cancer-Related Pain
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Abstract
Background: The opioid epidemic has spurred investigations for nonopioid options, yet limited research persists on medical marijuana’s (MMJ) efficacy in managing cancer-related symptoms.
Objective: We sought to characterize MMJ’s role on symptomatic relief and opioid consumption in the oncologic population.
Design: Retrospective chart review of MMJ-certified oncology patients was performed. Divided patients into MMJ use [MMJ(+)] versus no use [MMJ(−)], and Edmonton Symptom Assessment System (ESAS)-reported pain cohorts: “mild-moderate” versus “severe.”
Measurements: Medical records were reviewed for ESAS, to measure physical and emotional symptoms, and opiate consumption, converted into morphine milligram equivalents (MME). Minimal clinically important differences were determined. Wilcoxon signed-rank tests determined statistical significance between MMJ-certification and most recent palliative care visit.
Results: Identified 232 patients [95/232 MMJ(−); 137/232 MMJ(+)]. Pain, physical and total ESAS significantly improved for total MMJ(−) and MMJ(+); however, only MMJ(+) significantly improved emotional ESAS. MMJ(−) opioid consumption increased by 23% (97.5–120 mg/day MME, p = 0.004), while it remained constant (45–45 mg/day MME, p = 0.522) in MMJ(+). Physical and total ESAS improved in mild-moderate-MMJ(−) and MMJ(+). Pain and emotional symptoms worsened in MMJ(−); while MMJ(+)’s pain remained unchanged and emotional symptoms improved. MMJ(−) opioid consumption increased by 29% (90–126 mg/day MME, p = 0.012); while MMJ(+)’s decreased by 33% (45–30 mg/day MME, p = 0.935). Pain, physical, emotional, and total ESAS scores improved in severe-MMJ(−) and MMJ(+); opioid consumption reduced by 22% in MMJ(−) (135–106 mg/day MME, p = 0.124) and 33% in MMJ(+) (90–60 mg/day MME, p = 0.421).
Conclusions: MMJ(+) improved oncology patients’ ESAS scores despite opioid dose reductions and should be considered a viable adjuvant therapy for palliative management.
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