Medical journal says it regrets publishing Wakefield’s research on MMR. Controversy has raged for years, particularly in the UK, over reports of a link between MMR (measles, mumps and rubella) immunization and the development of autism. Now The Lancet, the British medical journal in which the original findings of Andrew Wakefield were published, finds that his report was compromised by undeclared conflict of interest and other methodological and ethical flaws in his research design which, had the editors known, should have precluded the publication of the findings. Rates of MMR vaccination in the UK have declined significantly in the wake of news of this putative association. —Nature