Is Pre-Exposure Prophylaxis for HIV prevention cost-effective in men who have sex with men in the UK? A modelling and health economic evaluation Valentina Cambiano PhD 1 , Alec Miners PhD 2 , David Dunn PhD 3 , Sheena McCormack FRCP 3 , Koh Jun Ong MSc 4 , O Noel Gill FFPH 4 , Anthony Nardone PhD 4 , Monica Desai MRCP 4 , Nigel Field PhD 1 , Graham Hart PhD 1 , Valerie Delpech PhD 4 , Gus Cairns MA 5 , Alison Rodger PhD 1 , Andrew Phillips PhD 1 1. Research Department of Infection and Population Health, UCL, London, UK 2. Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine, London, UK 3. MRC Clinical Trials Unit at UCL, London, UK 4. HIV & STI Department, Public Health England, London, UK 5. NAM Publications, London, UK Corresponding author: Valentina Cambiano v.cambiano@ucl.ac.uk Tel: 0044(0)207 794 0500 (ext. 34570) Research Department of Infection & Population Health, UCL Rowland Hill Street, London NW3 2PF Word count: 3,702