Thomson, Ph.D., cEO and president of Accuray. The team at Accuray is extremely proud of the CyberKnife VSI System and the huge benefits it brings to helping patients win their fight against cancer. .. 28 % of injecting medication users acquired their needles from secure sources Nearly fifty % of injection drug users disposed of their used syringes safely, yet only 28 % acquired their needles from safe sources, according to a scholarly study of injection drug users in Baltimore, Md., conducted by researchers at the Johns Hopkins Bloomberg School of Public Health.A statistical group in addition to the sponsors performed the analyses and safety-data preparation for each review. Statistical Analysis The principal efficacy variable was a sustained virologic response, thought as an undetectable HCV RNA level by the end of the procedure phase and 24 weeks after the last planned dose of study medication. The principal analysis was the estimation of the difference in sustained virologic response between individuals who had extended rapid virologic response and had been randomly assigned to receive T12PR24 versus T12PR48.5 percent. A sample size of 157 randomly assigned patients per research group was approximated to have 80 percent capacity to eliminate the noninferiority of T12PR24 in comparison with T12PR48 if the observed rate of sustained virologic response was 90 percent.