Effect of Laughter Therapy on Breast Cancer Patients

The aim of this study is to examine the effect of laughter therapy applied to breast cancer patients before surgical intervention on distress, depression and psychological well-being of patients. This research will be carried out as an experimental research with a randomised control group. The population of the study will consist of breast cancer patients diagnosed with breast cancer in a city hospital and scheduled for surgery in the breast-endocrine surgery clinic. The research will be carried out with patients who meet the inclusion criteria and agree to participate in the study. The sample size for the study was calculated using the G\* Power 3.1.9.7 programme (Faul et al., 2007). In the calculation, since there was no similar study for two-way mixed design analysis of variance, the required sample size was calculated as 48, 24 in each group, based on the medium effect size (effect size f=0.25), 5% margin of error (alpha=0.05), inter-measurement correlation value 0.5 and 80% power (1-β=0.80). Considering the data losses, the number was increased by 20% and a total of 56 patients in the intervention and control groups constituted the sample of the study. Hypothesis(es): H1: The effect of laughter therapy applied to breast cancer patients on distress over time is different in the experimental and control groups. H2: The effect of laughter therapy applied to breast cancer patients on depression over time is different in the experimental and control groups. H3: The effect of laughter therapy applied to breast cancer patients on psychological well-being according to time is different in experimental and control groups. In obtaining the research data; Personal Information Form, Distress Thermometer, Psychological well-being scale prepared by the researchers in line with the literature will be used. The research data will be collected face-to-face through data collection forms from breast cancer patients diagnosed with breast cancer and scheduled for surgery in