## 3+3 Design [Design Issues]

Hello All,

This is regarding 3+3 design for Phase-I trial. I have searched online and found some articles on design. My Question is that once the group/cohort is completed with 3 patients, whether same patients will be enrolled in next cohort or new patient will be enrolled? Further, in next cohort suppose 1 patient is withdarwn or have some AE then its compulsory to add 3 more patients to inline with multiplication of 3?

Thanks,
Pharma_88