Pain-related and psychological factors mediate the effect of personality on health-related quality of life. A study in breast cancer survivors with persistent pain

IntroductionPersonality characteristics affect the long-term well-being and health-related quality of life (HrQoL) of breast cancer (BC) survivors. Persistent pain significantly affects psychosocial well-being and HrQoL in this patient group. We studied the effects of temperament and character via pain-related and psychological factors on dimensions of HrQoL in BC survivors. MethodsWe studied 273 patients who had been treated for BC and who reported persistent pain at any site of the body in Brief Pain Inventory. The patients were recruited from a longitudinal cohort of patients 4-9 years after surgery for BC. Short-Form-36 inventory was used to assess physical and mental dimensions of HrQoL and Temperament and Character Inventory to assess dimensions of temperament and character. We used parallel mediation modeling for studying effects of temperament and character on physical and mental HrQoL. ResultsA significant total effect was found for harm avoidance (HA) temperament (& beta;(total) = -0.665, p < 0.001) and character dimensions self-directedness (SD) (& beta;(total) = 0.609, p = 0.001) and cooperativeness (CO) (& beta;(total) = 0.584, p = 0.028) on physical and mental HrQoL. Additionally, different combinations of pain-related and psychological variables fully mediated the indirect effects of HA, SD, and CO on physical and mental HrQoL. DiscussionHA temperament is a potential emotional vulnerability factor for psychological burden and impaired HrQoL in BC survivors. Character dimensions SD and CO may protect from the negative effect of mood on HrQoL. The results provide new insights about the risk-and target-factors for clinical interventions and effective pain management to improve psychosocial well-being and HrQoL in BC survivors.