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The intervention was designed for breast cancer patients in the early survivorship period meeting criteria for clinical levels of psychological symptoms.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Patients were randomly assigned to the immediate intervention arm (<jats:italic>n<\/jats:italic>\u00a0=\u00a061; intervention received immediately) or to the delayed intervention arm (<jats:italic>n<\/jats:italic>\u00a0=\u00a059; intervention received 5\u00a0months later). Psychological symptoms, including anxiety, depressive symptoms, emotional distress, fear of cancer recurrence (FCR), worry, and intrusive thoughts were assessed through questionnaires. Emotion regulation was assessed in a dynamic emotion regulation task and in everyday life. Assessments were completed at baseline (T1), 5\u00a0months (T2) and 10 months (T3) later.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Treated patients reported lower levels of worry and intrusive thoughts. They improved their ability to down\u2010regulate the intensity of their negative emotions when exposed to cancer\u2010related triggers in the dynamic emotion regulation task. They reported fewer and less intense negative emotions and more positive emotions in their everyday life. Benefits were maintained 5\u00a0months later, except for positive emotions in everyday life.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The results showed that focusing on emotion regulation is a relevant approach in the treatment of psychological symptoms for breast cancer patients in the early survivorship period meeting criteria for clinical levels of psychological symptoms. The intervention led to changes in patients' dynamic and everyday life emotion regulation. Consolidation sessions may be needed to sustain benefits in positive emotions and to increase the effect sizes.<\/jats:p><\/jats:sec>","DOI":"10.1002\/pon.6105","type":"journal-article","created":{"date-parts":[[2023,1,27]],"date-time":"2023-01-27T04:35:46Z","timestamp":1674794146000},"page":"597-609","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Improving emotion regulation in breast cancer patients in the early survivorship period: Efficacy of a brief ecologically boosted group intervention"],"prefix":"10.1002","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6321-5362","authenticated-orcid":false,"given":"Isabelle","family":"Merckaert","sequence":"first","affiliation":[{"name":"Universit\u00e9 libre de Bruxelles Facult\u00e9 des Sciences Psychologiques et de l\u2019\u00c9ducation Unit\u00e9 de Recherche en Psychosomatique et Psycho\u2010oncologie (URPP)  Brussels Belgium"},{"name":"Institut 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