Casault, L., Savard, J., Ivers, H., & Savard, M.H. (2015). A randomized-controlled trial of an early minimal cognitive-behavioural therapy for insomnia comorbid with cancer. Behaviour Research and Therapy, 67, 45–54. 

To examine the efficacy of an early minimal cognitive behavioral therapy (CBT) intervention for insomnia in patients with cancer

The treatment consisted of self-help CBT provided with written materials and three phone consultations. Participants completed a quiz after each booklet was read and were asked to maintain a daily sleep diary. Control patients did not receive any intervention. The study was conducted over six weeks. Study measures were obtained at baseline, at the end of six weeks, and three and six months later. Participants were paid after each assessment was completed.

• N = 35  
• MEAN AGE = 56.9 years (SD = 10 years)
• MALES: 7.9%, FEMALES: 92.1%
• KEY DISEASE CHARACTERISTICS: Most had breast cancer; various other types included
• OTHER KEY SAMPLE CHARACTERISTICS: 60% were married, 65.8% were in current treatment for cancer with radiation therapy and/or chemotherapy

• SITE: Single site  
• SETTING TYPE: Not specified    
• LOCATION: Canada

• PHASE OF CARE: Multiple phases of care

Randomized, controlled trial

• Insomnia Interview Schedule (IIS)
• Insomnia Severity Index (ISI)
• Sleep diary
• Hospital Anxiety and Depression Scale (HADS)
• Multidimensional Fatigue Inventory (MFI)
• European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ)
• Dysfunctional Beliefs and Attitudes About Sleep–Short Form (DBAS-SF)
• Sleep Behaviors Questionnaire (SBQ)

There were significant effects over time by study group on ISI scores in favor of the CBT intervention at six weeks (p < 0.001), and there were improvements in all sleep variables with effect sizes (d) ranging from 0.46–1.34. Control patients also showed improvements. There were no significant changes from the six-week to six-month time point in either group. Those in the CBT group had a reduction in hypnotic dosage (d = 0.40). There were significant improvements in anxiety scores (p < 0.001) in the CBT group at six weeks. Depression declined significantly in both groups. No significant effect on fatigue was found. A greater proportion of CBT patients achieved a sleep efficiency level greater than or equal to 85% (p = 0.01). More than 97% of patients completed the materials, and 91.2% completed the quiz on average.

The brief CBT intervention used here was effective in improving insomnia and anxiety among patients with cancer.

• Small sample (< 100)
• Risk of bias (no blinding)
• Risk of bias (no appropriate attentional control condition)
• Unintended interventions or applicable interventions not described that would influence results
• Other limitations/explanation: Use of hypnotics was not described after baseline

CBT interventions are effective in treating sleep–wake disturbances and psychological issues. This study demonstrated that the provision of a CBT approach via booklets and quizzes on the CBT for sleep content with follow-up and counseling by phone was an effective way to deliver the intervention. Although this sample size was small, it did approximate the size required from a power analysis. This approach to providing a CBT intervention can be practical and cost-effective. However, significant effects were only seen during the active study period, and effects were not shown to endure long-term.