Cytel is a multinational statistical software developer and contract research organization, headquartered in Cambridge, Massachusetts, USA. Cytel provides clinical trial design and implementation services and specialized statistical products primarily for the biotech and pharmaceutical development markets. Cytel specializes in adaptive trials – a new type of randomized clinical trial that allows modifications of ongoing trials while aiming to preserve the statistical validity and integrity of the study. Based on either frequentist or Bayesian statistics, adaptive trial designs are now widely accepted by government regulatory agencies including the United States Food and Drug Administration (FDA), European Medicines Agency (EMA), and Medicines and Healthcare products Regulatory Agency (MHRA) in early and later stage clinical studies. As of January 2014, the company claims all 25 top biopharma companies as users of its software to design, simulate and analyze operationally support trials.