Arvinas Estrogen Receptor, Inc.

The purpose of the study is to compare the amount vepdegestrant available from two different tablet formulations under fed conditions in healthy adult participants; 200 mg vepdegestrant alternative tablet formulation compared to 200 mg vepdegestrant standard tablet formulation.
This study is seeking male or female participants of non-childbearing potential age who:
* are 18 years or older
* are healthy as decided by medical tests.
* have a Body mass index (BMI) of 16 to 32 kilogram per meter squared; and a total body weight of more than 45 kilograms (99 pounds).
All participants will be put into groups to receive one of the 2 treatments in each period. This study will consist of 2 treatment sequences:
* Sequence 1: Single 200 mg dose of vepdegestrant registrational tablet in Period 1, followed by a single 200 mg dose of vepdegestrant variant tablet in Period 2.
* Sequence 2: Single 200 mg dose of vepdegestrant variant tablet in Period 1, followed by a single 200 mg dose of vepdegestrant registrational tablet in Period 2.
Participants will be in the study for about 11 weeks.

The purpose of the study is to look at how various tablets of a study medicine called vepdegestrant are processed in the body. This will be studied in healthy adult participants after food.
This study looks at how the medicine is changed and removed from the body after a participant takes it.
This study is seeking for participant who:
* are healthy males, and healthy females who do not have the possibility to have children.
* are 18 years of age or older.
* weigh more than 45 Kilograms (99 pounds).
The study consists of 3 treatments. Each participant will be assigned by chance to receive the 3 treatments in a certain sequence. This will be done over 3 study periods. Each treatment consists of a single amount of vepdegestrant taken by mouth in each study period. There will be a washout period between each study periods. The washout period is the time allowed for the medicine to get washed out from the body. How the medicine was processed will be calculated following each dose in each period. The total study duration is about 13 weeks.

The purpose of the study is to investigate the effect of multiple doses of a proton-pump inhibitor (PPI) esomeprazole on the PK of vepdegestrant under fed conditions in healthy adult participants.
All participants in this study will receive one dose of vepdegestrant alone by mouth in Period 1. In Period 2, everyone will receive esomeprazole by mouth once a day for multiple days. Participants will also receive one dose of vepdegestrant by mouth. The levels of vepdegestrant in Period 1 will be compared to the levels of vepdegestrant in Period 2 to determine if the PPI affects how vepdegestrant is processed differently in healthy adults.