Around 10% of mid- and late-stage clinical trials of cancer treatments end prematurely because not enough patients enroll, a recent analysis shows. This lack of participants slows the development of new cancer medications and wastes considerable amounts of money invested in these trials. The authors of the analysis hope to focus attention on possible reasons why too few patients enroll in clinical trials. Doctors may not always encourage their patients enough to participate, and some insurance plans do not cover the costs associated with clinical trials. Patients may also hesitate because they fear receiving only a placebo instead of treatment. However, in modern clinical trials, new cancer drugs are tested against the current standard therapy, so that all participants receive treatment.