The efficacy and mechanisms of a guided self‐help intervention based on mindfulness in patients with breast cancer: A randomized controlled trial

Background Mindfulness‐based interventions (MBIs) can alleviate psychological distress in patients with cancer. However, face‐to‐face MBIs may be inconvenient for patients. Therefore, guided self‐help interventions may be more accessible. The authors investigated the effects of a guided self‐help MBI for depression, anxiety, and sleep disorder symptoms in patients with breast cancer and explored the potential underlying mechanisms. Methods One hundred forty‐four postoperative patients with breast cancer were randomly assigned to an intervention group (6‐week guided self‐help MBI; n = 72) or a wait‐list control group (routine treatment; n = 72). Self‐reported depression, anxiety, sleep disorder symptoms, and rumination and worry as potential mediators were assessed at baseline and postintervention. Outcomes were then assessed at 1‐month and 3‐month follow‐up. The intervention's effects over time and the potential mediating effect were analyzed using generalized estimating equations. The trial was registered at the Chinese Clinical Registry (ChiCTR‐IOR‐16008073). Results Significant improvements in depression and sleep disorder symptoms occurred in the intervention group compared with wait‐list controls, and the improvements were maintained at 1‐month and 3‐month follow‐up. Changes in rumination and worry mediated the intervention's effects on changes in depression and sleep disorder symptoms. Conclusions A guided self‐help MBI reduced depressive and sleep disorder symptoms by mitigating rumination and worry in patients with breast cancer. These findings support benefits of this accessible psychological intervention in oncology and provide insight into possible mechanisms of action. The current research contributes to discovering effective and widely accessible means for people with physical health conditions and may remove barriers that otherwise would have precluded participation in face‐to‐face psychological interventions.