Mikalai
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Belarus,
2019-12-14 16:39
(1789 d 08:44 ago)

Posting: # 20975
Views: 3,849
 

 NTI drug but with high CV [Power / Sample Size]

Dear all.
What would be a sample size for a BE study when the CV of the drug is 30% but bioequivalence should be in range 90_110%? Our assumption is around 400 subject if the design is standard, and 200 if the design is replicative
Best regards.
Helmut
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Vienna, Austria,
2019-12-14 17:11
(1789 d 08:11 ago)

@ Mikalai
Posting: # 20976
Views: 2,946
 

 NTI drug with high CV?

Hi Mikalai,

❝ What would be a sample size for a BE study when the CV of the drug is 30% but bioequivalence should be in range 90_110%?


Unless the drug belongs to the last generation anticoagulants (dabigatran, rivaroxaban) that's a contradiction. NTIDs show low variability. Otherwise, there would have been serious problems in phase III: toxicity, lacking efficacy – no approval – end of story.
BTW, the acceptance limits for NTIDs in the EEA are 90.00–111.11%.

❝ Our assumption is around 400 subject if the design is standard, and 200 if the design is replicative


library(PowerTOST)
sampleN.TOST(CV = 0.3, theta1 = 0.9, design = "2x2x2")
sampleN.TOST(CV = 0.3, theta1 = 0.9, design = "2x2x4")

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