Abstract
This study aims to elucidate how self-efficacy influences cancer-related fatigue and health-related quality of life (HRQoL) in young survivors of childhood cancer. Forty-six young survivors (age range, 8–18 years) of childhood cancer who were currently in complete remission completed measures for self-efficacy (Pediatric General Self-Efficacy Scale (PedsSE)), cancer-related fatigue (Cancer-related Fatigue Score (CRFS)), and HRQoL (Pediatric Quality of Life Inventory 4.0 Generic Core Scale, Pediatric Quality of Life Inventory (PedsQL)). Structural relationships between the PedsSE and CRFS or PedsQL, including the effects of potential demographic or clinical confounders, were examined by machine learning random forest algorithms and structural equation modeling. According to the distribution of the PedsQL, six survivors with PedsQL < 70 were determined to have compromised HRQoL (referred to as “low-PedsQL survivors”). The random forest model identified six variables for the prediction of the CRFS, with the PedsSE being the most important, and eight variables for the distinction of low-PedsQL survivors, with the CRFS being the most and the PedsSE the third most important variable. The structural equation model indicated that a direct influence of the PedsSE on the PedsQL was less detectable (β = −0.049), whereas an indirect influence of the PedsSE on the PedsQL via the CRFS was evident (β = 0.333). The model explained 51% of the variation of the CRFS and 28% of the variation of the PedsQL. The PedsSE was strongly correlated with “altered mood” in the subclass of the CRFS (r = −0.470), and “altered mood” was strongly correlated with the PedsQL (r = 0.737). In conclusion, self-efficacy is a major determinant of cancer-related fatigue and influences HRQoL via cancer-related fatigue in survivors of childhood cancer. The main pathway from self-efficacy to HRQoL is thought to be via the emotional aspect of cancer-related fatigue. However, unlike adult survivors of cancer, self-efficacy for young survivors may not contribute much to self-management behaviors that maintain HRQoL.
Highlights
The Cancer-related Fatigue Score (CRFS) was distributed without left- or right-side deviation, while the PedsQL was distributed with right-side deviation
A theoretical model to examine the relationships among self-efficacy, cancer-related fatigue, and healthrelated quality of life (HRQoL) in cancer patients was first proposed by Hoffman et al [26]
They reported that self-efficacy had a positive effect on physical function status and served as a mediator between fatigue and physical function status in patients with cancer who were undergoing chemotherapy
Summary
As the survival rates for childhood cancers have improved remarkably over the past few decades, the number of long-term survivors continues to increase [1,2,3]. The long-term psychophysiological consequences of surviving childhood cancer patients have attracted the attention of many health-care professionals [4]. Since childhood cancer occurs during critical stages of growth and development, the impacts of disease and treatment on quality of life (QoL) might be more complicated and sustained in children than in adults. Young survivors may encounter more challenging situations in many areas of their school lives, which could lead to behavioral problems and social adjustment disorders [5,6,7]
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