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Waitlist period was followed by five explorative sessions, 18 experiential ST sessions, two treatment follow\u2010up (FU) booster sessions and a 6\u2010month FU assessment. Overall well\u2010being (ORS), behavioural treatment goals and negative core beliefs were assessed 60\u201391 times, global symptomatic distress (BSI) six times. PD severity (SCID\u20105\u2010PD) was pre\u2010post\u2010analysed. Randomisation and non\u2010parametric tests showed large significant effects (<jats:italic>d<\/jats:italic>\u00a0=\u20091.08\u20132.38, <jats:italic>r\u2009=<\/jats:italic>\u00a0.53\u2013.66<jats:italic>)<\/jats:italic> on all outcomes at treatment\u2010FU and 6\u2010month FU assessment. This is the first study providing preliminary evidence of effectiveness of brief individual experiential ST for patients with cluster C PD, tentatively challenging the common tenet that long treatment duration is required. 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