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Table 2 Simon’s 2-stage optimum design

From: A phase II trial of stereotactic body radiotherapy with concurrent anti-PD1 treatment in metastatic melanoma: evaluation of clinical and immunologic response

Optimal two stage design

Optimum design

First stage sample size (n1)

20

 a1

6

 b1

12

Maximum sample size (n)

40

 b2

17