title: Are depression and anxiety determinants or indicators of quality of life in breast cancer patients?
abstract: Depression and anxiety are associated with a decline of health-related quality of life (QoL) in breast cancer patients, and the present study aims to investigate the longitudinal relationship of depression and anxiety with QoL in breast cancer patients. Depression and anxiety (HADS) as well as QoL (EORTC QLQ-C30) were assessed at baseline and six-month follow-up in 118 breast cancer patients and analysed using cross-lagged partial correlation analysis (CLPC). There were significant partial correlations between depression and anxiety at baseline and physical functioning, emotional functioning and "global health and QoL" at six-month follow-up (range of pr = -0.197 and -0.392; p < 0.05). "Global health and QoL" at baseline was significantly correlated with depression and anxiety at follow-up (pr = -0.207 and -0.327; p < 0.05). Cognitive functioning at baseline was significantly associated with anxiety at follow-up (pr = -0.248; p < 0.01). CLPC analysis of two models (depression and anxiety determining QoL vs. QoL determining depression and anxiety) did not show significant results. Hence, in breast cancer patients, depression and anxiety are closely related to QoL and the observed correlations suggest a complex interrelation in which depression and anxiety have to be regarded as indicators of QoL rather than determinants.
authors.affiliation: Department of Rehabilitation Psychology and Psychotherapy, Institute of Psychology, University of Freiburg, Germany.
authors.forename: Nico
authors.initials: N
authors.lastname: Hutter
authors.forename: Barbara
authors.initials: B
authors.lastname: Vogel
authors.forename: Tatjana
authors.initials: T
authors.lastname: Alexander
authors.forename: Harald
authors.initials: H
authors.lastname: Baumeister
authors.forename: Almut
authors.initials: A
authors.lastname: Helmes
authors.forename: Jürgen
authors.initials: J
authors.lastname: Bengel
mesh_terms: D000328:Adult; D000368:Aged; D001007:Anxiety / Q000523:psychology*; D001943:Breast Neoplasms / Q000523:psychology*; D003863:Depression / Q000523:psychology*; D005260:Female; D006304:Health Status; D006801:Humans; D008875:Middle Aged; D011788:Quality of Life / Q000523:psychology*; D011795:Surveys and Questionnaires