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This study aimed to investigate the effectiveness of GST for Cluster\u2010C PD. Moreover, differences between the specific Cluster\u2010C PDs (avoidant PD, dependent PD and obsessive\u2010compulsive PD) were explored.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A multicentre open trial was conducted, including 137 patients with a Cluster\u2010C PD (avoidant PD: <jats:italic>n<\/jats:italic>\u2009=\u2009107, dependent PD: <jats:italic>n<\/jats:italic>\u2009=\u200911 and obsessive\u2010compulsive PD: <jats:italic>n<\/jats:italic>\u2009=\u200919). Patients received 30 weekly GST sessions with a maximum of 180\u2009min of individual ST and five optional monthly booster sessions. Outcome measures including Cluster\u2010C PD severity, general psychopathological symptoms, quality of life, functional impairment, happiness, PD\u2010related beliefs, self\u2010esteem, self\u2010ideal discrepancy, schemas and schema modes were assessed at baseline until 2\u2010year follow\u2010up with semi\u2010structured interviews and self\u2010report measures. Change over time and differences between the specific Cluster\u2010C PDs were analysed with mixed regression analyses.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The outcome measures showed significant improvements for all Cluster\u2010C PDs, with medium to large effect sizes after 2\u2009years. A treatment dropout rate of 11.7% was found. There were some indications for differences between the Cluster\u2010C PDs in severity at baseline, change trajectories and effectiveness of GST.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>This study demonstrated that GST is a promising treatment for Cluster\u2010C PDs. The following step is a randomized controlled trial to further document the (cost\u2010)effectiveness of GST.<\/jats:p><\/jats:sec>","DOI":"10.1002\/cpp.2903","type":"journal-article","created":{"date-parts":[[2023,9,11]],"date-time":"2023-09-11T03:28:35Z","timestamp":1694402915000},"page":"1279-1302","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Group schema therapy for cluster\u2010C personality disorders: A multicentre open pilot study"],"prefix":"10.1002","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6002-6892","authenticated-orcid":false,"given":"Carlijn J. 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