This study used a one-stage design to evaluate response to everolimus. If at least 3 responders are observed in 20 evaluable patients, then everolimus will be considered promising. If the true response rate is 5% (null hypothesis), the chance of concluding the treatment is active is 0.08 (Type I error). If the true response rate is 25% (alternative hypothesis), the chance of concluding the treatment is active is 0.91 (power).