Background :
In vitro-in vivo extrapolation (IVIVE) of hepatic drug clearance (>CL) involves the scaling of
hepatic intrinsic clearance (CLint,uH) by functional liver size, which is approximated by total liver volume (LV) as
per the convention. However, in most overweight and obese patients, LV includes abnormal liver fat, which is not
thought to contribute to drug elimination, thus overestimating drug CL. Therefore, lean liver volume (LLV) might be
a more appropriate scaler of CLint,uH.
Objective :
The objective of this work was to assess the application of LLV in CL extrapolation in overweight and
obese patients (BMI >25 kg/m2) using a model drug antipyrine.
Methods:
Recently, a model to predict LLV from patient sex, weight, and height was developed and evaluated. In
order to assess the LLV model’s use in IVIVE, a correlation-based analysis was conducted using antipyrine as an
example drug.
Results :
In the overweight group (BMI >25 kg/m2), LLV could describe 36% of the variation in antipyrine CL
(R2 = 0.36), which was >2-fold higher than that was explained by LV (R2 = 0.17). In the normal-weight groupjats:(BMI ≤25 kg/m2), the coefficients of determination were 58% (R2 = 0.58) and 43% (R2= 0.43) for LLV and LV,
respectively.
Conclusion :
The analysis indicates that LLV is potentially a more appropriate descriptor of functional liver size than
LV, particularly in overweight individuals. Therefore, LLV has a potential application in IVIVE of CL in obesity.
Model-Based Analysis of Biopharmaceutic Experiments To Improve Mechanistic Oral Absorption Modeling: An Integrated in Vitro in Vivo Extrapolation Perspective Using Ketoconazole as a Model Drug
