Chronic illness-related cognitive fusion explains the impact of body dissatisfaction and shame on depression symptoms in breast cancer patients.

Breast cancer is linked to psychological distress and mood disorders that are in turn associated with higher psychological dysfunction and decreased breast cancer survival. It is considered that psychological health in breast cancer is considerably affected by body image impairment, which in turn seems to be highly associated with shame. However, the impact of these variables on mental health may not be direct. The current study aimed to explore a comprehensive model regarding the role of chronic illness-related cognitive fusion in the relationship of body image dissatisfaction and chronic illness-related shame with depression symptoms. The sample was composed of 75 women with nonmetastatic breast cancer, recruited in a Radiotherapy Service in central Portugal. The conducted path model presented an excellent fit and accounted for 59% of the variance of depressive symptomatology. Further, it demonstrated that body image dissatisfaction's impact on depressed mood is significantly explained by the mechanisms of chronic illness-related shame and chronic illness-related cognitive fusion. It was also revealed that chronic illness-related cognitive fusion additionally mediated the impact of chronic illness-related shame on depression. These findings are suggestive of the importance of body image and chronic illness shame in the determination of breast cancer patients' depression symptoms and also the central role of chronic illness-related cognitive fusion in these relationships. Therefore, the implementation of acceptance and defusion-based psychotherapeutic interventions to improve mental health in cancer patients seems to be of great importance.

Developments on committed action: Validity of the CAQ-8 and analysis of committed action's role in depressive symptomatology in breast cancer patients and healthy individuals.

Committed action, a process of acceptance and commitment therapy's psychological flexibility model, is considered an understudied construct that currently can only be measured by one instrument, the Committed Action Questionnaire (CAQ-8). This study aims at analysing the psychometric properties of the CAQ-8 in healthy individuals and breast cancer patients. This study also aims to explore the specific meditational role of committed action in the well-established relationship between experiential avoidance and depression symptoms. The healthy sample comprised 294 adults from the general population, and the breast cancer samples comprised 82 participants. Both groups completed the validated self-report measures. CAQ-8's robustness was examined through validity analyses, confirmatory factor analyses, and multigroup analysis. The meditational model was conducted using structural equation modelling. The CAQ-8 presented good internal consistency and construct, convergent, concurrent, and divergent validity in both samples. Further, the CAQ-8 showed incremental validity over a measure of engaged living. Findings also demonstrated measurement invariance between healthy individuals and breast cancer patients. Regarding the conducted meditational model that was also invariant between the two analysed groups, it was demonstrated that part of the effect that experiential avoidance holds on depressive symptomatology is explained by committed action. This study suggests that the CAQ-8 is adequate for use in healthy and cancer populations. Moreover, it provides novel, empirical support regarding the links between committed action, experiential avoidance, and depressed mood, being also the first investigation to particularly study committed action in a cancer population. Implications for theory and practice are discussed.