Simon’s minimax and optimal and Jung’s admissible two-stage designs with or without curtailment. This article describes a new Stata command called simontwostage, which calculates the critical values and sample sizes for two-stage designs for phase II oncology trials. Options are provided to determine the minimax and optimal designs proposed by Simon (1989, Controlled Clinical Trials 10: 1–10) and admissible designs described by Jung et al. (2004, Statistics in Medicine 23: 561–569). Furthermore, nonstochastic and stochastic curtailment rules can be implemented in both stages of the trial, and the properties of the curtailed designs can be examined.

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  1. Kunz, Cornelia U.; Kieser, Meinhard: Curtailment in single-arm two-stage phase II oncology trials (2012)