Observational Study of Gut Microbiota in Abemaciclib-Treated Patients With and Without Diarrhea
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- This is an observational study: the protocol does not assign a study treatment.
- Who it may be relevant to
- Registry conditions: Breast Neoplasms, Hormone Receptor-Positive Breast Cancer, Abemaciclib, Abemaciclib-related Diarrhea. Basic parameters: 18 years — 75 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- China
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
Unsure about the terms? Read our patient guide →
Official title
Gut Microbiota Changes in Breast Cancer Patients Treated With Abemaciclib and Correlation With Drug-Induced Diarrhea: An Observational Cohort Study
Overview
Why is this study being done? Many patients with a type of breast cancer (called HR-positive) take a medicine called Abemaciclib. While this medicine is effective, a very common side effect is diarrhea, which can be severe enough to disrupt treatment and reduce quality of life. The reason why some patients get diarrhea and others do not is not well understood. This study aims to investigate whether the natural bacteria living in the gut (known as the gut microbiome) play a role in this side effect. Researchers will compare the gut bacteria of patients who develop diarrhea with those who do not. What will happen in the study? This is an observational study, which means that patients will receive their normal cancer treatment and will not be given any new or experimental drugs as part of this initial phase. * Patients who are already being treated with Abemaciclib will be invited to join. * They will be placed into one of two groups: those who experience diarrhea and those who do not. * Participants will be asked to provide stool (feces) samples and may also provide optional blood samples at specific times during their treatment. * Researchers will analyze these samples in the lab to study the types and functions of the gut bacteria. Who can participate? * Adult women (aged 18-75) diagnosed with HR-positive breast cancer. * Currently receiving treatment with Abemaciclib for at least 2 weeks. * Must be willing to provide informed consent and follow the study procedures. What are the potential benefits? Participants will not receive any direct medical benefit from taking part in this study. However, the information learned may help researchers better understand why diarrhea occurs and, in the future, could lead to new ways to prevent or treat this side effect for other cancer patients. How is privacy protected? All personal information and samples collected will be de-identified using a unique code. This means that the data used for analysis cannot be directly linked back to the participant's identity. All data is stored securely according to strict ethical guidelines.
Primary outcome measures
- Difference in gut microbiota beta diversity [Time frame: Through study completion, an average of 6 months.]
- Identification of specific bacterial species enriched in non-diarrhea group [Time frame: Through study completion, an average of 6 months.]
Secondary outcome measures (4)
- Difference in gut microbiota alpha diversity [Time frame: Through study completion, an average of 6 months.]
- Difference in metagenomic functional pathways [Time frame: Through study completion, an average of 6 months.]
- Differential metabolites in serum [Time frame: Through study completion, an average of 6 months.]
- Difference in systemic inflammatory cytokine levels [Time frame: Through study completion, an average of 6 months.]
Eligibility criteria
Inclusion criteria
- Aged 18 to 75 years.
- Diagnosed with hormone receptor-positive (HR⁺) breast cancer.
- Currently receiving treatment with Abemaciclib (either as monotherapy or in combination with endocrine therapy) for a duration of at least 2 weeks.
- Willing and able to provide written informed consent for participation in the study.
Exclusion criteria
- History of major gastrointestinal diseases, such as inflammatory bowel disease, Crohn's disease, ulcerative colitis, or intestinal obstruction, or having undergone major gastrointestinal surgery.
- Recent use (within 1 month) of antibiotics, probiotics, or traditional Chinese medicine that may alter gut function.
- Pregnant or lactating women.
- Unwilling to provide informed consent or considered by the investigator to be unsuitable for the study for any other reason.
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Observational model
- Cohort
Study locations
China · 1 center
- Hubei Cancer Hospital — Wuhan
Identifiers
NCT: NCT07264998 · LLHBCH2025YN-088