dose selection using pre-clinical pkpd · capturing clinical pk variability varying cl captures a...
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Dose selection using pre-clinical PKPD
James Yates, Oncology iMED DMPK Modelling and Simulation
An oncology systems pharmacology approach to dose selection
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Disclaimer
The views and opinions expressed in these slides are mine and do not necessarily represent the views of AstraZeneca
D-E-R Workshop 2014
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Problem statement Early clinical trial data – what dose to take forward?
AZD9291: EGFR inhibitor At the time this modelling was carried out: 1. Doses 20-160mg QD investigated 2. Responses observed at all doses 3. MTD not identified 4. Did not want to take MTD forward – take biologically effective dose
forward with good safety profile 5. What is this dose?
(Part) of the solution: A mathematical model relating PK, PD and efficacy had
been developed during the discovery program. Use this to put differences between mouse and human PK into context and simulate clinical dose response
Will discuss pre-clinical model development and application to make clinical
dose decision
D-E-R Workshop 2014
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Mouse PK Simultaneous modelling of active parent and metabolite
D-E-R Workshop 2014
Parent – Green Metabolite - Maroon
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Linking PK to pEGFR PD Turnover model with irreversible binding combining parent and metabolite drug effect
Ratio of parent to metabolite potency fixed to in vitro value
Model and data
D-E-R Workshop 2014
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pEGFR knock down – PKPD hysteresis plot PK does not determine duration of effect
D-E-R Workshop 2014
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PD Model to explain efficacy Determining the relationship between pEGFR reduction and efficacy
D-E-R Workshop 2014
pEGFR reduction linked to cell death within mathematical model of tumour growth Result is linkage between target engagement and efficacy
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Human Half-life is much longer than mouse. How does this impact PKPD?
D-E-R Workshop 2014
More frequent dosing gives higher Cmin
More frequent dosing gives lower Cmax – 4 fold difference between QD and 10D
Simulate dose fractionation in mouse
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Simulated Mouse Efficacy for dose fractionation Dose response changes with dosing frequency
D-E-R Workshop 2014
0
50
100
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450
0 5 10 15 20 25 30
%TG
I
Total daily dose mg/kg
QD
BD
TID
10D
... lower daily dose (AUC) as effective as higher dose if given more frequently than QD
Efficacy increases with total dose, but ...
Increasing dosing frequency
Simulated dose fractionation suggested that frequency of delivery was not critical. If anything the flatter profile resulting from frequent dosing was most effective according to the model. This is encouraging given long half-life in human
Total daily dose mg/kg
%TGI
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Capturing clinical PK variability Varying CL captures a large amount of variability.
D-E-R Workshop 2014
-0.4
-0.2
0
0.2
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0 50 100 150 200
AZD9
291
uM
Time hrs
AZD9291 Simulation 97.5% Simulation 2.5%
00.005
0.010.015
0.020.025
0.030.035
0.040.045
0 50 100 150 200
AZ51
04 u
M
Time hrs
AZ5104 Simulation 97.5% Simulation 2.5%
Not a formal pop PK analysis – used model of predicted human PK and updated based upon observed data Lower end of exposure captured – important for biologically effective dose questions
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AZD9291 clinical dose response simulation Human PK combined with mouse PD-efficacy
Activating mutant
Wild type xenograft
1st generation TKI resistant
Modelling suggests dose response against mutant EGFR saturates by 80mg Observed Safety profile good at this dose
D-E-R Workshop 2014
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Conclusions Use of pre-clinical modelling to guide clinical dosing
1. Integration of clinical PK with pre-clinical PD-efficacy relationship has provided a way to augment early clinical data with richer pre-clinical data set.
2. Allows the biologically effective dose (based upon animal models and clinical exposure) to be identified.
3. Potential to remove necessity to dose to MTD to maximise probability of clinical activity.
4. Ongoing question of quantitative translation of animal models of cancers to the clinic
D-E-R Workshop 2014
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D-E-R Workshop 2014
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