Positive Psychological Constructs and Health Outcomes in Hematopoietic Stem Cell Transplantation Patients: A Systematic Review

Positive psychological constructs (eg, optimism, positive affect) have been independently associated with superior health outcomes across many medical populations. However, there has been little synthesis of the literature examining these associations among patients with hematologic malignancies receiving hematopoietic stem cell transplantation (HSCT). To address this gap we completed a systematic review, using Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines, of studies examining relationships between positive psychological constructs and health-related outcomes (eg, psychiatric symptoms, function, health-related quality of life [HRQoL], or treatment compliance) after HSCT. Eighteen eligible studies (N = 4201; 47% women; mean age, 47.1) were identified. Optimism (n = 12 studies) was the most frequently studied positive construct and HRQoL (examined in n = 11 studies) the most common outcome. All 17 studies with quantitative analyses found a significant (P < .05) association between a positive psychological construct and a health outcome; most but not all controlled for 1 or more relevant covariates. Among patients with hematologic malignancies who receive HSCT, positive psychological constructs appear to be associated with improved HRQoL and other health outcomes. Further work is warranted to more comprehensively understand the independent effects of positive psychological constructs on a variety of health outcomes and to develop interventions to promote well-being that are adapted to the needs of this population.