sponsor decision

The purpose of the study is to compare the amount of mevrometostat available from four different tablet formulations, taken with food, in healthy adult participants.

This study is seeking male or female participants 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
• a total body weight of more than 50 kilograms (110 pounds).

All participants will take part in 4 study periods to receive 4 different treatments, which are assigned in a random order. There will also be a 5-day gap between each study period. This is done so that the medicine is passed out of the body before the start of the next period.

Each treatment consists of a single dose of mevrometostat (PF-06821497), and the treatments differ only by tablet formulation.

How the medicine is processed in the body will be studied after giving the medicines to the participants. This will be done by collecting blood samples after giving each of these tablets. The results will be used to see the effect of tablet formulation on the amount of mevrometostat (PF-06821497) available in the blood of the participants.

Participants will be in the study for about 12 weeks.

Inclusion Criteria:

• Participants ≥18 years of age, inclusive, at screening.
• Male and female participants who are overtly healthy as determined by medical evaluation including medical history, physical examination, laboratory tests, vital signs and 12-lead ECGs.
• BMI of 16-32 kg/m2; and a total body weight >50 kg (110 lb)
• Evidence of a personally signed and dated ICD indicating that the participant has been informed of all pertinent aspects of the study.
• Participants who are willing and able to comply with all scheduled visits, treatment plan, laboratory tests, lifestyle considerations, and other study procedures.

Exclusion Criteria:

• Evidence or history of clinically significant hematological, renal, endocrine, pulmonary, gastrointestinal, cardiovascular, hepatic, psychiatric, neurological, or allergic disease (including drug allergies, but excluding untreated, asymptomatic, seasonal allergies at the time of dosing) or prior allergic reaction to any component of mevrometostat.

  • Any condition possibly affecting drug absorption (eg, gastrectomy, cholecystectomy).
  • History of HIV infection, hepatitis B, or hepatitis C; positive testing for HIV, HBsAg, HBsAb, HBcAb, or HCVAb. Hepatitis B vaccination is allowed.

• Any medical or psychiatric condition including recent (within the past year) or active suicidal ideation/behavior or laboratory abnormality or other conditions that may increase the risk of study participation or, in the investigator's judgment, make the participant inappropriate for the study.

• Previous administration with an investigational product (drug or vaccine) within 30 days (or as determined by the local requirement) or 5 halflives preceding the first dose of study intervention used in this study (whichever is longer). Participation in studies of other investigational products (drug or vaccine) at any time during participation in this study.

Pfizer will provide access to individual de-identified participant data and related study documents (e.g. protocol, Statistical Analysis Plan (SAP), Clinical Study Report (CSR)) upon request from qualified researchers, and subject to certain criteria, conditions, and exceptions. Further details on Pfizer's data sharing criteria and process for requesting access can be found at: https://www.pfizer.com/science/clinical\_trials/trial\_data\_and\_results/data\_requests.