The purpose of the study is to look at how the body processes a study medicine called vepdegestrant in participants with loss of liver function relative to people with normal liver function. This study is seeking participants who are: * females who cannot have children or males * between 18 and 70 years of age * weigh more than 50 Kilograms (110 pounds) * either healthy with normal liver function or have loss of liver function All participants in this study will take one dose of vepdegestrant by mouth. This study looks at how the medicine is changed and removed from the body after being taken by the participants. The amount of vepdegestrant in participants with loss of liver function will be compared to the amount of vepdegestrant in participants with normal liver function. All participants will stay at the study clinic for about 11 days and 10 nights.
Phase 1 trials primarily test safety and dosing in a small number of participants (typically 20–100). Results do not yet speak to efficacy. FDA approval is typically many years away from this stage.
Currently recruiting: the trial is enrolling patients. A data readout is not expected until after enrollment closes and the follow-up period is complete.
Pfizer Inc (PFE) is the sponsoring company for this trial. BiotechSign currently grades this company F (33/100) based on composite catalyst signals across its full pipeline. This trial is one data point in that overall catalyst picture.