The cost of drug development, a metric that underlies discussions ranging from investment in startups to drug pricing, is a matter of great interest and controversy within the pharmaceutical industry. The Tufts Center for the Study of Drug Development recently completed a new estimate of the cost of developing a new prescription drug and raised it to $2.6 billion, up from $802 million in 2003. We spoke to Joe DiMasi, director of economic analysis at the Tufts center for the Study of Drug Development and principal investigator for the study, about the findings, why there’s been dramatic growth in cost despite efforts to reinvent drug development, and whether there’s reason to think the trend will reverse itself anytime soon.