A Study to Investigate the Effect of Impaired Hepatic Function on the Pharmacokinetics of Entrectinib in Volunteers With Different Levels of Hepatic Function

This is a non-randomized, open-label, one treatment, four group, parallel group study to investigate the effect of impaired hepatic function on the pharmacokinetics of entrectinib in participants with different levels of hepatic function. Participants with mild, moderate or severe hepatic impairment ('Mild', 'Moderate' and 'Severe' groups), and control participants with normal hepatic function ('Normal' group) will each receive a single 100 mg dose of entrectinib after consumption of a standardized meal.

Participants with reduced hepatic function will be assigned to a functional category based on assessments at the Screening visit. Each individual will be categorized according to the Child Pugh system for classifying hepatic impairment and also according to the National Cancer Institute organ dysfunction working group (NCI-ODWG) system. Recruitment will be staggered to allow review of pharmacokinetic and safety data from at least three participants in each of the Mild and Moderate groups before participants are enrolled into the Severe group. Recruitment of the Severe group will only proceed if there is agreement between the Sponsor and the Investigator that data from this group are necessary to fulfill the objectives of the study and that dosing is not anticipated to present an unacceptable risk to those individuals. The control group of participants with normal hepatic function will be enrolled after the full complement of participants with hepatic dysfunction has been dosed.