Effect of a group-based acceptance and commitment therapy (ACT) intervention on illness cognition in breast cancer patients

Abstract Objective Illness cognition is an important predictor of psychological adjustment among breast cancer patients; however, interventions related to illness cognition remain limited. This study aimed to determine the feasibility and effectiveness of a group-based acceptance and commitment therapy (ACT) intervention in improving illness cognition among breast cancer patients undergoing chemotherapy. Methods A quasi-experimental “time-block” design, with two arms and four assessment time points, was used. Eighty-four patients were recruited from a breast cancer center; 42 patients were assigned to the ACT group and 42 to the health education (HE) group. The ACT group participated in four sessions of group-based ACT intervention in a clinical setting, and the HE group underwent one session of group-based HE. Psychological flexibility, illness cognition, and quality of life were assessed at a pre-intervention time point (T1, baseline), a post-intervention time point (T2, 4 weeks), and two follow-up time points (T3, 8 weeks; T4, 16 weeks). Results The effects of time (p  Conclusions The intervention was effective in improving psychological flexibility, illness cognition, and quality of life. However, a randomized controlled trial is needed to confirm the findings of this pilot study.