A Japanese hospital group have carried out a study investigating the effects of laughter therapy on the immune systems of cancer patients being treated with surgery and chemotherapy. Forty one patients with an average age of 68.9 years, who were being treated for either gastrointestinal or colorectal cancer, were included in the study. 24 patients were treated with laughter therapy as a supportive treatment to their cancer therapy and the other 17 cancer patients served as a control group. The immunity in the control group decreased in all patients whilst the Smile-Sun method treated chemotherapy patients showed increased immunity, especially in patients with colorectal cancer.
Sakai Y et al. A trial of improvement of immunity in cancer patients by laughter therapy. Jpn Hosp. Jul 2013.
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