NCT06123988 · University of Miami
Prolonged Overnight Fasting and/or Exercise on Fatigue and Other Patient Reported Outcomes in Women With Hormone Receptor Positive Advanced Breast Cancer
(FastER)
What this study is about
The purpose of this study is to test if four different programs (prolonged overnighting fasting alone, exercise alone, a combination of prolonged overnight fasting and exercise, or general health education sessions alone) can reduce fatigue in women with advanced or metastatic breast cancer who are receiving a medication called a cyclin-dependent kinases-4 and 6 (CDK4/6) inhibitor (e.g.
View original scientific description
The purpose of this study is to test if four different programs (prolonged overnighting fasting alone, exercise alone, a combination of prolonged overnight fasting and exercise, or general health education sessions alone) can reduce fatigue in women with advanced or metastatic breast cancer who are receiving a medication called a cyclin-dependent kinases-4 and 6 (CDK4/6) inhibitor (e.g., palbociclib, ribociclib, or abemaciclib), with or without HER2-directed therapy (e.g., trastuzumab ± pertuzumab), or in combination with both a CDK4/6 inhibitor and a PI3K inhibitor, within the past 90 days.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Able to provide written informed consent
- Able to speak, read, and understand English or Spanish
- Postmenopausal (including concurrent use of ovarian suppression)
- Diagnosis of ER+ and/or PR+, hormone estrogen receptor-2 (HER-2)- or HER-2+ metastatic or locally advanced unresectable breast cancer
- Initiation of first-line or second-line endocrine therapy in combination with a CDK4/6 inhibitor (e.g., palbociclib, ribociclib, or abemaciclib), with or without hormone estrogen receptor-2 (HER2)-directed therapy (e.g., trastuzumab ± pertuzumab), or in combination with both a CDK4/6 inhibitor and a Phosphoinositide 3-kinase (PI3K) inhibitor, within the past 90 days.
- Prior use of a CDK4/6 inhibitor in the adjuvant setting is permitted; participants must be enrolled within 90 days of starting a CDK4/6 inhibitor for the first or second time in the metastatic or locally advanced setting.
- Participants who switch from one CDK4/6 inhibitor to another due to toxicity or insurance constraints remain eligible, provided enrollment occurs within 90 days of initiating the first or second-line CDK4/6 inhibitor in the metastatic or locally advanced setting.
- Having not consistently (not equal to or more than 50% of the time) engaged in more than 90 minutes of moderate or 45 minutes of vigorous physical activity per week over the past 3 months
- Having not consistently engaged in resistance training 2 or more days per week over the past 3 months
- Having not consistently (not equal to or more than 50% of the time) engaged in structured fasting (i.e., not regularly fasting for ≥12hr/night) for the past 3 months
- Approval from a medical oncology provider to participate.
Exclusion criteria
- Unable to provide consent
- Unable to read or understand English or Spanish
- Oxygen dependent
- Unstable cardiac disease
- Insulin-dependent diabetes
- Unable to walk 2 blocks without assistance (excluding canes)
- Regularly maintaining a shiftwork schedule, i.e. working evening shifts, night shifts, or rotating shifts in the last 3 months
- History of a clinical eating disorder
- Unstable bone metastases
- More than 90 days since initiation of first- or second-line endocrine therapy in combination with 1) a CDK4/6 inhibitor, with or without HER2-directed therapy, or 2) a CDK 4/6 inhibitor in combination with a PI3K inhibitor, in the metastatic or locally advanced.
- Presence of a severe medical condition or psychiatric condition or medications that would preclude participation of the study intervention.
Where
- Phoenix, Arizona
- Miami, Florida
- Boston, Massachusetts
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Aug 6, 2025 · Source of record for eligibility and locations