Abstract
PURPOSE: The growing population of cancer survivors in the US highlights the need for adaptive digital mental health treatments that can help address a large gap in mental health treatment. Although just-in-time adaptive interventions (JITAIs) hold promise for improving mental health outcomes, none have been developed specifically for cancer survivors, in part due to their complexity. The purpose of this study was to identify survivor-level factors that could inform the development and optimization of adaptive treatments aimed at improving affective outcomes in this population. METHODS: A total of 426 adults diagnosed with cancer within the past five years participated in a 5-week observational study. Participants completed smartphone-based surveys three times per day assessing momentary affect, affective forecasting, emotion regulation attempts, social interaction quality, pain, and sleep duration from the previous night. Linear mixed-effects models were conducted at the momentary level to examine associations with positive affect (PA) and negative affect (NA). RESULTS: Higher momentary PA was associated with longer sleep duration the previous night, lower pain, fewer emotion regulation attempts, higher-quality social interactions, and forecasting one's future affect as more positive. In contrast, higher momentary NA was associated with shorter sleep duration the previous night, greater pain, more frequent emotion regulation attempts, poorer-quality social interactions, and forecasting one's future affect as more negative. CONCLUSION: These findings identify several modifiable meta-emotion and psychosocial factors that may serve as promising targets for future JITAIs designed to improve affective well-being among cancer survivors.