Statistics suggest that Phase I clinical trials, while by no means free of challenges, are more manageable than later phases. They tend to take less time and cost less money; the drugs they test have a comfortable 70% chance of moving on to the next phase.(1) These figures are a reprieve from some of the realities that make Phase I trials, in some respects, uniquely stressful. The absence of a safety profile for the drug being tested can make subject recruitment particularly challenging. And any errors or delays in Phase I can set the tone for the rest of the drug development process.