Bioequivalence and Bioavailability Forum • partial AUC, early exposure

partial AUC, early exposure [Regulatives / Guidelines]

posted by d_labes – Berlin, Germany, 2008-09-03 10:35 (6075 d 23:17 ago) – Posting: # 2308
Views: 24,561

Dear all!

Characteristics to be investigated, page 9 (lines 313-317)
'For products where rapid absorption is of importance, partial AUCs can be used as a measure of early exposure. The partial area can in most cases be truncated at the population median of tmax values for the reference formulation. However, an alternative time point for truncating the partial AUC can be used when clinically relevant. The time point for truncating the partial AUC should be pre-specified and justified in the study protocol.'

This is nearly the same sentence then in the FDA guidance.
It seems partly that this was introduced to get rid of tmax and nonparametric evaluation of that metric.

I wonder how we can interpret "... truncated at population median ...".
What do you think what the population median is?

Helmut has discussed this in the context of data deletion due to emesis in this post.
If I understood his opinion right, the population median is the sample median of the reference formulation (study specific).

But the DRAFT calls for a prespecified truncation point. This I interpret as not study specific but specific for the reference formulation or from clinical relevance (whatever this means).
Where can we get a value for that ominous population median of tmax values for the reference? :ponder:

Next question in that context is: Who decides for which product rapid absorption is important and therefore partial Area should be evaluated?

—
Regards,

Detlew

Complete thread:

Critical review of EU BE guideline (Rev.1) Helmut 2008-08-22 14:30 [Regulatives / Guidelines]
- Critical review of EU BE guideline (Rev.1) d_labes 2008-08-22 15:42
  - Critical review of EU BE guideline (Rev.1) Helmut 2008-08-23 02:02
    - Critical review of EU BE guideline (Rev.1) d_labes 2008-08-25 09:14
      - Variations Helmut 2008-08-25 11:06
- Critical review of EU BE guideline (Rev.1) Jaime_R 2008-08-23 16:47
  - Critical review of EU BE guideline (Rev.1) Ravi 2008-08-25 08:19
    - Two Stage Design Helmut 2008-08-25 11:43
      - Two Stage Design JPL 2008-08-28 09:44
        
        Two Stage Design Helmut 2008-08-28 11:50
        
        Two Stage Design d_labes 2008-08-28 12:09
        Sequential Design Helmut 2008-11-05 13:22
  - Critical review of EU BE guideline (Rev.1) banusunman 2008-08-26 16:56
    - Washout Helmut 2008-10-15 16:02
- Critical review of EU BE guideline (Rev.1) d_labes 2008-08-25 09:49
  - Critical review of EU BE guideline (Rev.1) Helmut 2008-08-25 12:11
    - Critical review of EU BE guideline (Rev.1) d_labes 2008-08-25 13:03
    - Urban legend? Helmut 2008-11-21 16:06
      - Urban legend? d_labes 2008-11-24 15:06
- Critical review of EU BE guideline (Rev.1) d_labes 2008-08-25 11:16
- Critical review of EU BE guideline (Rev.1), tmax, MRT, LZ d_labes 2008-08-25 11:32
  - Critical review of EU BE guideline (Rev.1), tmax, MRT, LZ Helmut 2008-08-25 13:10
  - tmax, nonparametrics Helmut 2008-10-13 15:38
    - tmax, nonparametrics d_labes 2008-10-14 08:33
      - tmax, nonparametrics Helmut 2008-10-14 11:29
      - tmax, Canadian approach Helmut 2008-11-21 15:41
        
        tmax, Canadian approach d_labes 2008-11-24 13:53
        
        Early exposure, Canadian approach: GMR only! Helmut 2009-02-08 00:44
        
        Early exposure, Canadian approach: GMR only! d_labes 2009-02-09 08:50
        
        tmax; another example Helmut 2008-12-25 15:59
- Automatic integration janmacek 2008-08-27 12:21
  - Automatic integration Ohlbe 2008-08-27 14:49
    - Manual reintegration! H_Rotter 2008-08-28 11:28
      - Manual reintegration! ElMaestro 2008-08-28 12:44
- Subject accountability, Proc MIXED or equivalent d_labes 2008-09-02 11:13
  - Subject accountability, Proc MIXED or equivalent Ohlbe 2008-09-02 15:20
    - Subject accountability, Proc MIXED or equivalent d_labes 2008-09-02 16:30
- partial AUC, early exposured_labes 2008-09-03 08:35
- HVDs? Helmut 2008-09-23 12:52
  - HVDs? d_labes 2008-09-23 14:20
  - HVDs? Helmut 2009-01-20 14:33
  - E.g., omeprazole Helmut 2009-03-06 17:21
- BCS-based Biowaiver Helmut 2008-09-25 15:48
  - Dissolution update Helmut 2008-10-13 12:43
- EUFEPS workshop Helmut 2008-12-23 17:03