The purpose of this clinical trial is to provide study medicine(s) and learn about their safety. This study is seeking participants who: * Have benefited from ongoing study treatment as determined by the study doctor in a Pfizer-sponsored palbociclib Parent Study * Must agree to follow the reproductive criteria * Are willing and able to comply with all scheduled visits, treatment plans, and other study procedures * Can give signed informed consent documents Participants in this study will continue to receive treatment as they were in the parent study. The time by which participants will take part in this study is retrospective (after completed parent study). We will examine the experiences of people receiving the study medicine(s). This will help us determine if the study medicine(s) are safe. During this time, the participants will be monitored for the safety of the study medicine(s).
Breast Cancer, Head and Neck Cancer
The purpose of this clinical trial is to provide study medicine(s) and learn about their safety. This study is seeking participants who: * Have benefited from ongoing study treatment as determined by the study doctor in a Pfizer-sponsored palbociclib Parent Study * Must agree to follow the reproductive criteria * Are willing and able to comply with all scheduled visits, treatment plans, and other study procedures * Can give signed informed consent documents Participants in this study will continue to receive treatment as they were in the parent study. The time by which participants will take part in this study is retrospective (after completed parent study). We will examine the experiences of people receiving the study medicine(s). This will help us determine if the study medicine(s) are safe. During this time, the participants will be monitored for the safety of the study medicine(s).
Study for Participants Continuing From Pfizer-sponsored Palbociclib (a Study Medicine) Studies
-
UCSF Medical Center at Mission Bay, San Francisco, California, United States, 94158
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
For general information about clinical research, read Learn About Studies.
18 Years to
ALL
No
Pfizer,
Pfizer CT.gov Call Center, STUDY_DIRECTOR, Pfizer
2026-12-31