Effect of yoga on patients with cancer: our current understanding.

OBJECTIVE To determine whether therapeutic yoga improves the quality of life of patients with cancer. DATA SOURCES Search of MEDLINE database (1950-2010) using key words yoga, cancer, and quality of life. STUDY SELECTION Priority was given to randomized controlled clinical studies conducted to determine the effect of yoga on typical symptoms of patients with cancer in North America. SYNTHESIS Initially, 4 randomized controlled clinical studies were analyzed, then 2 studies without control groups were analyzed. Three studies conducted in India and the Near East provided interesting information on methodologies. The interventions included yoga sessions of varying length and frequency. The parameters measured also varied among studies. Several symptoms improved substantially with yoga (higher quality of sleep, decrease in symptoms of anxiety and depression, improvement in spiritual well-being, etc). It would appear that quality of life, or some aspects thereof, also improved. CONCLUSION The variety of benefits derived, the absence of side effects, and the cost-benefit ratio of therapeutic yoga make it an interesting alternative for family physicians to suggest to their patients with cancer. Certain methodologic shortcomings, including the limited size of the samples and varying levels of attendance on the part of the subjects, might have reduced the statistical strength of the studies presented. It is also possible that the measurement scales used did not suit this type of situation and patient population, making it impossible to see a significant effect. However, favourable comments by participants during the studies and their level of appreciation and well-being suggest that further research is called for to fully understand the mechanisms of these effects.