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Introduction: Adalimumab is an effective treatment for autoimmune non-infectious uveitis (ANIU), but it is currently only funded for a minority of patients with ANIU in the UK as it is restricted by the National Institute for Health and Care Excellence guidance. Ophthalmologists believe that adalimumab may be effective in a wider range of patients. The Adalimumab vs placebo as add-on to Standard Therapy for autoimmune Uveitis: Tolerability, Effectiveness and cost-effectiveness (ASTUTE) trial will recruit patients with ANIU who do and do not meet funding criteria and will evaluate the effectiveness and cost-effectiveness of adalimumab versus placebo as an add-on therapy to standard care., Methods and Analysis: The ASTUTE trial is a multicentre, parallel-group, placebo-controlled, pragmatic randomised controlled trial with a 16-week treatment run-in (TRI). At the end of the TRI, only responders will be randomised (1:1) to 40 mg adalimumab or placebo (both are the study investigational medicinal product) self-administered fortnightly by subcutaneous injection. The target sample size is 174 randomised participants. The primary outcome is time to treatment failure (TF), a composite of signs indicative of active ANIU. Secondary outcomes include individual TF components, retinal morphology, adverse events, health-related quality of life, patient-reported side effects and visual function, best-corrected visual acuity, employment status and resource use. In the event of TF, open-label drug treatment will be restarted as per TRI for 16 weeks, and if a participant responds again, allocation will be switched without unmasking and treatment with investigational medicinal product restarted., Ethics and Dissemination: The trial received Research Ethics Committee (REC) approval from South Central - Oxford B REC in June 2020. The findings will be presented at international meetings, by peer-reviewed publications and through patient organisations and newsletters to patients, where available., Trial Registration: ISRCTN31474800. Registered 14 April 2020., Competing Interests: Competing interests: CAR received support from the National Institute for Health and Care Research (NIHR) for the project associated with this manuscript, which was paid to the University of Bristol. KP, MH, LC, MPYL, SB and BCR received support from the NIHR for the project associated with this manuscript, which contributed to their salary. SW, TP, SMS, NAVB and AD received support from the NIHR for the project associated with this manuscript, which was paid to their institution. SMS is the chair of the NIHR Uveitis Clinical Study Group. PAK receives support from UK Research and Innovation and Moorfields Eye Charity. PAK reports payment for consulting for Novartis, Boehringer-Ingleheim, Apellis, Abbvie, Roche and Adecco. PAK reports payment or honoraria for educational events for Novartis, Gyroscope, Bayer, Thea, Boehringer-Ingleheim, Apellis, Abbvie and Alimera. PAK participates on an advisory board for RetinAI, Novartis, Boehringer-Ingleheim, Roche and Abbvie. PAK reports patents for Google US10198832B2 (issued) and Google US20220301152A1 (pending). PAK reports stock with Big Picture Medical (stocks) and Bitfount (stock options). NAVB receives support from Wellcome Trust and recently receives support from Indonesian Endowment Fund for Education paid to their institution. NAVB reports payments for consulting for Roche. NAVB reports payment or honoria for educational events for Alimera Sciences. NAVB is a member of the Scientific Committee of the Royal College of Ophthalmologists. AD receives support from NIHR Biomedical Research Centre, Janssen Pharmaceuticals, Macular Society, MRC Cluster Consortium Awards and Arthritis Research UK, which is paid to his institution. AD receives royalties from The Eye Basic Science in Practice (Elsevier). AD reports payment for consulting for Hovartis, Hubble Htz, Active Bio and Gilead. AD participates on an advisory board for Co-THEIA Randomised Controlled Trial in Spain. AD is a non-executive director at Moorfields NHS Foundation Trust. No other conflicts were reported., (© Author(s) (or their employer(s)) 2024. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)