Background: Osimertinib, an EGFR tyrosine kinase inhibitor, is mainly metabolized by CYP3A. This study investigated genetic and non-genetic factors influencing plasma osimertinib concentrations in 36 patients with non-small cell lung cancer. Changes in CYP3A activity were evaluated using its endogenous marker, 4β-hydroxycholesterol (4β-OHC).
Yokoyama et al. (Thu,) studied this question.