AbstractObjectiveFear of cancer recurrence (FCR) is highly prevalent, however there is no formal training for clinicians to address FCR. A novel brief clinician intervention to help patients manage FCR (Clinician Intervention to Reduce Fear of Recurrence (CIFeR)) was shown to be feasible, acceptable, and reduced FCR in breast cancer patients in a pilot study. We now aim to explore the barriers and facilitators of implementing CIFeR within routine oncology practice in Australia.MethodsThis multicentre, single‐arm Phase I/II implementation study recruited surgical, medical and radiation oncologists who treat women with early breast cancer. Participating clinicians completed online CIFeR training and were asked to use CIFeR for the next 6 months. Questionnaires were administered before (T0), immediately after (T1), then 3 (T2) and 6 months (T3) after training to assess confidence in addressing FCR and Proctor Implementation outcomes. The primary outcome was adoption at T2. Secondary outcomes were self‐efficacy in FCR management, acceptability, feasibility, costs, barriers and facilitators of implementation.ResultsFifty‐two clinicians consented of whom 37 completed the CIFeR intervention training. Median age of participants was 41.5 (range 29–61), 73% were female and 51% were medical oncologists. The primary endpoint was met, with CIFeR adopted by 82%. Clinician intervention delivery took 7.4 min on average and was deemed acceptable, appropriate and feasible. Self‐efficacy in managing FCR improved significantly across all domains (p < 0.001). Lack of time was the greatest barrier to routine CIFeR_2 implementation.ConclusionsA structured brief, low‐cost clinician intervention to reduce FCR is useful, acceptable and improved self‐efficacy with FCR management. Fear of cancer recurrence training should be incorporated into communication skills training of oncologists and surgeons.Trial RegistrationProspectively registered with the Australian New Zealand Clinical Trials Registry, ACTRN12621001697875.Trial SponsorChris O’Brien Lifehouse.