Little is known about the therapeutic processes contributing to efficacy of psychological interventions for patients with cancer. Data from a randomized clinical trial yielding robust biobehavioral and health effects (B. L. Andersen et al., 2004Andersen et al., , 2007 were used to examine associations between process variables, treatment utilization, and outcomes. Novel findings emerged. Patients were highly satisfied with the treatment, but their higher levels of felt support (group cohesion) covaried with lower distress and fewer symptoms. Also, specific. treatment strategies were associated with specific outcomes, including lower distress, improved dietary habits, reduced symptomatology, and higher chemotherapy dose intensity. These data provide a comprehensive test of multiple therapeutic processes and mechanisms for biobehavioral change with an intervention including both intensive and maintenance phases.
Keywordsprocess; therapy; cancer; compliance; dose intensity Psychological interventions for patients with cancer are largely effective in reducing the many burdens and sequelae of the disease and treatment. Interventions can improve emotional adjustment and quality of life, with selected demonstrations of positive health and immune outcomes (Andersen, 2002;Meyer & Mark, 1995). Despite this, little is known about the therapeutic events or processes that lead to or are responsible for therapeutic change and the durability of such change. Kazdin (2006) noted that evaluating mechanisms is important for many reasons. Data on mechanisms can bring order to the variety of treatments available, provide explanations of the broad effects of therapy, enhance translation of treatments to clinical practice, assist in the identification of treatment moderators, and facilitate understanding of therapeutic change. We discuss the influence of process variablessatisfaction with the treatment and feelings of cohesion-and the relationship between utilization of intervention techniques and treatment outcomes. Necessarily, we also draw on the psychotherapy outcome research literature.Patient satisfaction with treatment is a singularly important goal, but it may also be important because it is influential to patients' involvement intreatment (Dearing, Barrick, Dermen, & Walitzer, 2005) and, in turn, treatment efficacy. For group psychotherapy patients, treatment satisfaction has been associated with willingness to participate (Perrone & Sedlacek, 2000). It is important to note that studies with both psychotherapy and primary care outpatients have identified associations between satisfaction and adherence, including appointment keeping (Dearing et al., 2005), compliance with treatment recommendations (Hirsh et al., 2005), and medication use (Barfod et al., 2005). When asked, patients with cancer are typically satisfied with what psychological interventions have to offer (Petersson, Berglund, Brodin, Glimelius, & Sjoden, 2000;Manne et al., 2007). More specific questions have found that, among interventions that includ...