ABOUT THIS STUDY
- Participants must have histologically confirmed hormone receptor positive (HR+) HER2 negative stage II (except T2N0) or stage III invasive breast cancer. Evaluation for metastatic disease is not required in the absence of symptoms.
- Men and both pre- and postmenopausal women are eligible.
- Prior Treatment:
- Participants may have received (neo)adjuvant chemotherapy, but must be at least 30 days after last dose, with no more than grade 1 residual toxicity at time of screening.
- Participants may have received adjuvant radiotherapy, but must be at least 30 days after last dose , with no more than grade 1 residual toxicity at the time of screening.
- If most recent therapy was surgery, participants must be at least 30 days out from definitive surgery with no active wound healing complications.
- Participants must have demonstrated ability to tolerate endocrine therapy by prior successful completion of at least 1 month of tamoxifen or aromatase inhibitor (AI) therapy without significant adverse events, and in the opinion of the treating physician any ongoing toxicity does not preclude ability to continue on tamoxifen or AI for at least a projected 2 year continuous duration. Ongoing use of any endocrine therapy, including tamoxifen, letrozole, anastrozole, or exemestane, is allowed. Patients may enroll within 2 years of beginning endocrine therapy, as long as there is a plan for at least 2 more years of adjuvant endocrine therapy.
- ECOG performance status 0-1
- Age ≥18 years.
- Normal organ and marrow function
- Baseline QTc ≤ 480 ms
- The effects of palbociclib on the developing human fetus are unknown. Women who might become pregnant must use adequate contraception
- Ability to understand and the willingness to sign a written informed consent document
- Concurrent therapy with other investigational agents.
- Prior therapy with any CDK4/6 inhibitor.
- History of allergic reactions attributed to compounds of similar chemical or biologic
composition to palbociclib.
- Participants receiving any medications or substances that are strong inhibitors or
inducers of CYP3A isoenzymes are ineligible.
- Current use of drugs that are known to prolong the QT interval
- Subjects with organ allograft requiring immunosuppression.
- Uncontrolled intercurrent illness including, but not limited to ongoing or active
infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac
arrhythmia, or psychiatric illness/social situations that would limit compliance with
- Pregnant women are excluded from this study. Breastfeeding should be discontinued
prior to entry onto the study.
- Individuals with a history of a different malignancy are ineligible except for the
following circumstances. Individuals with a history of other malignancies are eligible
if they have been disease-free for at least 5 years and are deemed by the investigator
to be at low risk for recurrence of that malignancy. Individuals with the following
cancers are eligible if diagnosed and treated within the past 5 years: ductal
carcinoma in situ of the breast, cervical cancer in situ, and basal cell or squamous
cell carcinoma of the skin.
- No ongoing combination antiretroviral therapy
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