TY - JOUR
T1 - Sample size computation in phase II designs combining the A’Hern design and the Sargent and Goldberg design
AU - Neven, Anouk
AU - Mauer, Murielle
AU - Hasan, Baktiar
AU - Sylvester, Richard
AU - Collette, Laurence
N1 - Funding Information:
This publication was supported by a donation from the “Fondation contre le cancer” from “Belgium” through the EORTC Cancer Research Fund.
Funding Information:
This publication was supported by a donation from the ?Fondation contre le cancer? from ?Belgium? through the EORTC Cancer Research Fund. The authors would like to thank the two referees whose comments greatly improved the manuscript.
Publisher Copyright:
© 2019, © 2019 Taylor & Francis Group, LLC.
PY - 2020/3/3
Y1 - 2020/3/3
N2 - This work focuses on the modification of two classical phase II trials designs, the A’Hern design, a single-arm single-stage design, and the Sargent and Goldberg design introduced in the context of flexible screening designs. In the first part of the paper, we have proposed a drift-adjusted A’Hern design, a hybrid design combining the A’Hern design and the Sargent and Goldberg design. Indeed, classical single-arm phase II designs such as the A’Hern design are still widely used in oncology. Conducting randomized comparative phase II trials may be challenging in many settings due to the increased sample size and this despite larger type 1 errors. Randomized non-comparative phase II designs first introduced by Herson and Carter include a simultaneous randomized standard-treatment reference arm to detect any drift in the reference arm assumption, but the trial is analyzed against historical controls as if it were a single-arm study. However, not incorporating at all an internal control arm in the trial design has been criticized in the literature. Our new design takes into account the observed response rate in a non-comparative reference arm to reduce the trial’s risk of a false-positive conclusion. In the second part, we have proposed an alternative strategy to determining the sample size of the screened selection design. The latter, introduced in recent years by Yap et al. and Wu et al., extended the Sargent and Goldberg design to include a comparison to a historical control. However, their sample size computations may have potential weaknesses, which motivated us to revisit the existing approaches. A detailed simulation study has been carried out to evaluate the operating characteristics of the drift-adjusted A’Hern design and the different sample size strategies of the screened selection designs.
AB - This work focuses on the modification of two classical phase II trials designs, the A’Hern design, a single-arm single-stage design, and the Sargent and Goldberg design introduced in the context of flexible screening designs. In the first part of the paper, we have proposed a drift-adjusted A’Hern design, a hybrid design combining the A’Hern design and the Sargent and Goldberg design. Indeed, classical single-arm phase II designs such as the A’Hern design are still widely used in oncology. Conducting randomized comparative phase II trials may be challenging in many settings due to the increased sample size and this despite larger type 1 errors. Randomized non-comparative phase II designs first introduced by Herson and Carter include a simultaneous randomized standard-treatment reference arm to detect any drift in the reference arm assumption, but the trial is analyzed against historical controls as if it were a single-arm study. However, not incorporating at all an internal control arm in the trial design has been criticized in the literature. Our new design takes into account the observed response rate in a non-comparative reference arm to reduce the trial’s risk of a false-positive conclusion. In the second part, we have proposed an alternative strategy to determining the sample size of the screened selection design. The latter, introduced in recent years by Yap et al. and Wu et al., extended the Sargent and Goldberg design to include a comparison to a historical control. However, their sample size computations may have potential weaknesses, which motivated us to revisit the existing approaches. A detailed simulation study has been carried out to evaluate the operating characteristics of the drift-adjusted A’Hern design and the different sample size strategies of the screened selection designs.
KW - A’Hern design
KW - flexible design
KW - pick-the-winner design
KW - Randomized phase II
KW - sample size computation
KW - screening design
UR - http://www.scopus.com/inward/record.url?scp=85080853159&partnerID=8YFLogxK
U2 - 10.1080/10543406.2019.1641817
DO - 10.1080/10543406.2019.1641817
M3 - Article
C2 - 31331234
AN - SCOPUS:85080853159
SN - 1054-3406
VL - 30
SP - 305
EP - 321
JO - Journal of Biopharmaceutical Statistics
JF - Journal of Biopharmaceutical Statistics
IS - 2
ER -