Title {1}	Protocol for the Metformin Aneurysm Trial (MAT): A placebo-controlled randomised trial testing whether metformin reduces the risk of serious complications of abdominal aortic aneurysm.
Trial registration {2a and 2b}	ACTRN12618001707257; Registered 16th October 2018.
Protocol version {3}	01 August 2021 v7.0
Funding {4}	This study receives its funding from the National Health and Medical Research Council of Australia, the Royal Australasian College of Surgeons, the Australian and New Zealand Society for Vascular Surgery, The Townsville Hospital and Health Services and the Health Research Council of New Zealand.
Author details {5a}	1Queensland Research Centre for Peripheral Vascular Disease, College of Medicine and Dentistry, James Cook University, Townsville, Queensland, Australia 2The Department of Vascular and Endovascular Surgery, The Townsville University Hospital, Townsville, Queensland, Australia 3The Australian Institute of Tropical Health and Medicine, James Cook University, Townsville, Queensland, Australia 4George Institute Australia, Sydney, New South Wales, Australia 5University of New South Wales, Sydney, New South Wales, Australia 6Curtin School of Population Health, Faculty of Health Sciences, Curtin University, Perth, Western Australia, Australia 7Department of Surgical Sciences, Division of Health Sciences, University of Otago, Dunedin, New Zealand 8Department of Surgery, University of Otago, Christchurch, New Zealand 9Department of Cardiovascular Services, University of Leicester, Leicester, UK
Name and contact information for the trial sponsor {5b}	James Cook University, Townsville, Australia, 4811.
Role of sponsor {5c}	The funders and sponsor had no role in the design of this protocol or the decision to submit it for publication.