Greater Social Isolation and Social Constraints Prior to Hematopoietic Stem Cell Transplant Are Associated with Greater Anxiety and Depressive Symptoms.

Background: Hematopoietic stem cell transplantation (hereafter "HCT") is a physically and psychologically difficult treatment for patients with hematological cancers. This study examined relationships among patients' reports of pre-transplant social isolation, social constraints, and psychological distress.

Method: We used baseline data from a multisite randomized controlled trial evaluating the effects of expressive helping writing to reduce physical and emotional symptoms in HCT patients. We collected data prior to randomization and before either allogenic or autologous HCT using validated scales to assess social constraints, social isolation, anxiety, and depressive symptoms. We analyzed data using bivariate analysis and multivariate linear regression. We also explored whether social isolation mediated the effect of social constraints on both of our outcomes: anxiety and depressive symptoms.

Results: Among 259 adults recruited prior to transplant, 43.6% were women (mean age = 57.42 years, SD = 12.34 years). In multivariate analysis controlling for relevant covariates, both social isolation (β = 0.24, p < 0.001) and social constraints (β = 0.28, p < 0.001) were associated with anxiety. When both social constraints and social isolation were in the model, only greater social isolation (β = 0.79, p < 0.001) was associated with depressive symptoms. Social isolation fully mediated the association between social constraints and anxiety and depressive symptoms.

Conclusion: For patients awaiting either allogenic or autologous HCT, the negative association between social constraints and anxiety and depressive symptoms may be related, in part, to the mechanism of perceived social isolation. Interventions prior to and during HCT are needed to support patients' psychological health and sense of social connectedness.