Bioequivalence and Bioavailability Forum

Reanalysis for PK Reason: Gone with the Wind [Bioanalytics]

posted by dshah  – India, 2020-07-20 09:22 (1764 d 20:06 ago) – Posting: # 21755
Views: 8,098

Dear Scopy!

Pls note that over here, we are only taking for pre-dose concentration. If the predose concentration>5%, the subject would be excluded from analysis as per most of the guideline. Pls find following example to illustrate that the impact on AUC would not be significant.

❝ ❝ If we are focusing on root cause, I believe that for pre-dose concentration even in period-I would not cause a significant issue to final BE out come as it may only impact AUC and it would not be significant. If the value is MT 5% of Cmax, the subject would by default not considered for statistical evaluation.

❝

❝ How can you be so sure that its effect on AUC won't be significant? The removal/or inclusion of a subject from a statistical evaluation is enough is change the outcome especially if the result is borderline.

The concentration in below table is shown where only Pre-dose concentration is changed and then AUC is given using PKSolver.

time concentration 1 concentration 2 concentration 3 concentration 4
0          0               2               4               5
0.25       9.5             9.5             9.5             9.5
0.5       23              23              23              23
0.75      45              45              45              45
1         80              80              80              80
1.5      100             100             100             100
2         95              95              95              95
3         85              85              85              85
4         75              75              75              75
6         65              65              65              65
8         50              50              50              50
10        35              35              35              35
12        20              20              20              20
14        16              16              16              16
16        12              12              12              12
20        10              10              10              10
24         5               5               5               5
AUC      826.125         826.375         826.625         826.75

I believe that such small change in AUC can be considered non-significant.

Regards,
Dshah

Complete thread:

• Reanalysis for Pharmacokinetic Reason Obinoscopy 2020-07-16 14:30 [Bioanalytics] 
  • Reanalysis for PK Reason: Gone with the Wind Helmut 2020-07-16 15:10
    • Reanalysis for PK Reason: Gone with the Wind Ohlbe 2020-07-16 17:16
      • Reanalysis for PK Reason: Gone with the Wind Helmut 2020-07-16 18:39
        • Reanalysis for PK Reason: Gone with the Wind Ohlbe 2020-07-16 19:15
      • Reanalysis for PK Reason: Gone with the Wind Obinoscopy 2020-07-16 21:48
        • PK assessors variability Ohlbe 2020-07-16 23:07
          • Sometimes PK assessors ≈ scientists Helmut 2020-07-17 16:11
          • PK assessors variability Obinoscopy 2020-07-17 23:48
        • Reanalysis for PK Reason: Gone with the Wind ElMaestro 2020-07-16 23:19
          • Reanalysis for PK Reason: Gone with the Wind dshah 2020-07-17 06:40
            • Reanalysis for PK Reason: Gone with the Wind Obinoscopy 2020-07-18 00:27
              • Reanalysis for PK Reason: Gone with the Winddshah 2020-07-20 07:22
                • Reanalysis for PK Reason: Gone with the Wind Obinoscopy 2020-07-20 14:12
                • Positive pre-dose Ohlbe 2020-07-20 14:43
          • Reanalysis for PK Reason: Gone with the Wind Obinoscopy 2020-07-18 00:00
            • Reanalysis for PK Reason: Gone with the Wind ElMaestro 2020-07-20 07:49
              • Reanalysis for PK Reason: Gone with the Wind Helmut 2020-07-20 10:52
                • Sightly OT (for once) ElMaestro 2020-07-20 12:12
  • Reanalysis for Pharmacokinetic Reason Achievwin 2020-07-27 23:47