Predicting and modifying substance use in childhood cancer survivors: application of a conceptual model.

PURPOSE/OBJECTIVES: To identify factors that predict or modify substance use in childhood cancer survivors and to describe how a risk-counseling intervention reduced young survivors' substance use. DESIGN: Secondary analysis of clinical trial data and primary analysis of medical record data. SETTING: Outpatient clinic. SAMPLE: 149 females and 118 males 12-18 years of age whose cancer had been in remission for at least two years were randomly assigned to intervention (n = 132) and standard care (n = 135) groups. METHODS: Self-report questionnaires, abstracted medical record data, confirmatory factor analysis, and structural equation modeling. MAIN RESEARCH VARIABLES: Smoking, alcohol consumption, knowledge, risk perceptions, motivation, and worry about cancer and treatment effects. FINDINGS: Three factors directly predicted substance use at baseline: being in a higher grade in school (independent of age), feelings of being more susceptible to late effects of cancer therapy, and worrying more about cancer and its treatment. At follow-up a year later, grade in school and worry predicted increased substance use. In addition, a desire to change health behavior, influenced by the intervention and gender, predicted decreased substance use. The mechanism of influence of the intervention was evident: The intervention led to a need to change, which precipitated a desire to change and ultimately resulted in decreased substance use. CONCLUSIONS: Young survivors' worries and concerns about their cancer and treatment-related late effects are a new intervention target. Motivation is sensitive to behavioral change interventions and positively affects risk reduction. IMPLICATIONS FOR NURSING: Two new intervention strategies to address the impact of survivors' concerns about their cancer and its treatment are implied: (a) Replace substance use with new coping methods to reduce fear and anxiety, and (b) tailor motivation-based interventions to age and gender to communicate graphically and realistically to survivors the personal importance of behavioral change in modifying the risks of late effects.