RT Journal Article T1 Psychosocial interventions reduce cortisol in breast cancer patients: systematic review and meta-analysis A1 Mészáros Crow, Edith A1 López-Gigosos, Rosa María A1 Mariscal-López, Eloísa A1 Agredano-Sánchez, Marina A1 García-Casares, Natalia A1 Mariscal-Larrubia, Alberto A1 Gutiérrez-Bedmar, Mario K1 Mamas - Cáncer - Aspectos psicológicos AB Introduction: Cancer initiation, progression and recurrence are intricate mechanisms that depend on various components: genetic, psychophysiological, or environmental. Exposure to chronic stress includes fear of recurrence that can affect biological processes that regulate immune and endocrine systems, increase cancer risk, and influence the survival rate. Previous studies show that psychological interventions might influence the level of cortisol that has been extensively used as a biomarker for measuring hypothalamic-pituitary-adrenal axis functioning and body's immunity response. This meta-analysis aimed to provide a quantitative scrutiny of the effect of certain types of psychosocial interventions on cortisol as a neuroendocrine biomarker in saliva or blood and might predict breast cancer (BC) progression.Methods: A literature search was performed in the following databases: PubMed, The Cohrane Library, Scopus, WOS, PsychInfo, Google Scholar, Ovid Science Direct. After methodical selection of originally generated 2.021 studies, the search yielded eight articles that met inclusion criteria. All these studies explored effects of psychosocial interventions that measured cortisol in total of 366 participants with BC, stages 0-IV, in randomized control trial or quasi experimental study design setting. We applied random effects model to conduct meta-analyses on the parameters of salivary and plasma cortisol and used PRISMA Guidelines as validated methodology of investigation to report the results.Results: Eight studies selected for meta-analysis have shown the reduction of cortisol level due to applied psychosocial intervention. The random effects model showed that interventions produced large effect sizes in reductions of cortisol in blood (Cohen's d = −1.82, 95% Confidence Interval (CI): −3.03, −0.60) and slightly less in saliva (d = −1.73, 95%CI: −2.68, −0.78) with an overall effect of d = −1.76 (95%CI: −2.46, −1.07). PB Frontiers Media YR 2023 FD 2023 LK https://hdl.handle.net/10630/36131 UL https://hdl.handle.net/10630/36131 LA eng NO Mészáros Crow E, López-Gigosos R, Mariscal-López E, Agredano-Sanchez M, García-Casares N, Mariscal A and Gutiérrez-Bedmar M (2023) Psychosocial interventions reduce cortisol in breast cancer patients: systematic review and meta-analysis. Front. Psychol. 14:1148805. doi: 10.3389/fpsyg.2023.1148805 DS RIUMA. Repositorio Institucional de la Universidad de Málaga RD 20 ene 2026