Entwicklung und Evaluation einer Akzeptanz- und Commitment-Therapie (ACT)-basierten Gruppenintervention für psychisch belastete onkologische Patienten./ [Development and Evaluation of an Acceptance and Commitment Therapy (ACT)-Based Group Intervention for Cancer Patients with Psychological Burden].

OBJECTIVE: Cancer is associated with many psychosocial stressors that lead to high psychological distress in over 50% of patients. About one third of patients make use of psycho-oncological services. Acceptance and Commitment Therapy (ACT), a transdiagnostic approach of the third wave of cognitive behavioral therapy, represents a promising approach for psycho-oncological interventions. However, the German-speaking area lacks a manualized ACT-based group intervention that is tested for feasibility and effectiveness. METHODS: To bridge this gap, we developed and preliminarily tested an ACT group intervention in this one-arm monocentric pilot study. It targets psychological burdened cancer patients in all disease stages. During 8 sessions, the ACT core processes mindfulness, values and acceptance are worked out by means of metaphors and experience-oriented exercises. RESULTS: Pre-Post-Data of our pilot study with n=25 patients indicate reductions in fear of progression, depression and psychological inflexibility, as well as an increase in psychological health-related quality of life and well-being. Regression analyses showed that changes in psychological flexibility predicted changes in all psychological outcome measures. The very high adherence underlines the feasibility of the intervention for the integrated outpatient clinic setting. DISCUSSION: Our pilot study provides first evidences for the good feasibility and effectiveness of an ACT-based group intervention in the German-speaking area. These results on effectivness should be interpreted with caution due to the lack of an experimental control group. CONCLUSION: Future studies should test the effectiveness of the intervention in randomized controlled trials (RCTs) with longer follow-up periods.