The purpose of this study is to learn about the safety of a new study medicine called PF-08103402 in healthy adults (do not have disease) and or in adults with mild-to-moderate asthma. This is the first time the study medicine is being given to people.
For Parts A, B, C, D and F, the study is seeking participants who:
* Are healthy (do not have disease) males or females who can no longer have children, * Are 18 to 65 years old, * Have a body mass index (BMI) of 16 to 32 kilograms per meter squared and a body weight of more than 50 kilograms (110 pounds). Body mass index is a way to measure body fat by using a person's height and weight
For Part A (optional group or cohort 3: Japanese participants only):
* A body weight of more than 45 kilograms (100 pounds). * Have 4 biological Japanese grandparents who were born in Japan.
For Part E only:
* Adults with a documented history of asthma (confirmed by a doctor) for at least 12 months before entering the study. * Have a body mass index (BMI) of 16 to 35 kilograms per meter squared and a total body weight of more than 50 kilograms (110 pounds).
The study has six parts: Part A, Part B, Part C, Part D, Part E and Part F. The study medicine will be taken as a suspension or tablet by mouth 1 time a day (except in Parts B and E where it will be taken 1 time a day for 14 days) at the study clinic. The study will help understand:
* how the body processes the study medicine in healthy participants (Parts A and B), * how much of the study medicine gets into the bloodstream and if food affects the amount of study medicine in the blood in healthy participants (Part C), * how the study medicine is broken down and leaves the body in healthy participants (Optional Part D), * how the study medicine is processed in adults with mild-to-moderate asthma (Optional Part E), * if taking the study medicine together with another medicine affects how each medicine is processed by the body in healthy participants (Optional Part F).
Participants will take part in the study for about 10 weeks (Parts A and F), 12 weeks (Part B), 9 weeks (Parts C and D), and 16 weeks (Part E).
During this time, they will have 2 study visits at the study clinic and up to 28 overnight stays (Part A), 18 overnight stays (Parts B and E), 10 overnight stays (Part C), 11 overnight stays (Part D), and 16 overnight stays (Part F). The study team will also call participants 1 time over the phone at the end of the study to assess how they are doing.
Study measurements will be taken by body examination, monitoring side effects, blood and urine tests, heart tests (ECG), vital signs (blood pressure, pulse and respiratory rate), questionnaires (Parts C and E), stool samples (Part D only), and breathing tests (Part E only).
Are males or females who can no longer have children,
Are 18 to 65 years old,
Have a body mass index (BMI) of 16 to 32 kilograms per meter squared and a total body weight of more than 50 kilograms (110 pounds).
A total body weight of more than 45 kg (100 pounds).
Evidence or history of clinically significant medical conditions.
History of human immunodeficiency virus (HIV) infection, hepatitis B, or hepatitis C; positive testing for HIV, hepatitis B surface antigen (HBsAg), or hepatitis C antibody (HCVAb).
History of alcohol abuse or binge drinking and/or any other illicit drug use or dependence within 6 months of Screening.
Participation in studies of other investigational products (drug or vaccine) at any time during their participation in this study.
Sequential
PF-08103402
DrugOral suspension (Parts A to F); Tablets (Parts C and F only)
Placebo
DrugOral suspension (Parts A, B and E).
Midazolam
DrugOral syrup
6
Treatment groupsSee each treatment group below.
Number of Participants with Treatment Emergent Adverse Events (TEAEs)
Part A: Cohorts 1, 2 and Cohort 3 (optional). Part B: Cohorts 4, 5, 6, and 7 and Cohort 8 (optional). Part E: Cohorts 11 (optional) and 12 (optional)
Number of Participants with Serious Adverse Events (SAEs)
Part A: Cohorts 1, 2 and Cohort 3 (optional). Part B: Cohorts 4, 5, 6, and 7 and Cohort 8 (optional). Part E: Cohorts 11 (optional) and 12 (optional)
Number of Participants With Clinically Significant Change From Baseline in Laboratory Abnormalities
Part A: Cohorts 1, 2 and Cohort 3 (optional). Part B: Cohorts 4, 5, 6, and 7 and Cohort 8 (optional). Part E: Cohorts 11 (optional) and 12 (optional)
Number of Participants With Clinically Significant Change From Baseline in Vital Signs
Part A: Cohorts 1, 2 and Cohort 3 (optional). Part B: Cohorts 4, 5, 6, and 7 and Cohort 8 (optional). Part E: Cohorts 11 (optional) and 12 (optional).
Area under the concentration-time curve from time zero to the time of the last quantifiable concentration (AUClast)
Part A: Cohorts 1, 2 and Cohort 3 (optional).
Maximum observed plasma concentration (Cmax)
Part A: Cohorts 1, 2 and Cohort 3 (optional).
Time of Maximum observed plasma concentration (Tmax)
Part A: Cohorts 1, 2 and Cohort 3 (optional).
Area under the curve from time zero to extrapolated infinite time (AUCinf) if data permit
Part A: Cohorts 1, 2 and Cohort 3 (optional).
