Probiotics for Prevention of Neratinib-Induced Diarrhea in Breast Cancer Patients

NCT06892093 · tracked via the Priya Life Science China tracker

Sponsor

Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University

Phase

Not applicable

Started

2025-08-07

Last updated

2026-06-17

Condition(s) studied

HER2-positive Breast CancerDiarrhea Caused by DrugNeratinib

Investigational drug(s) / intervention(s)

ProbioticsPlaceboLoperamide →

Probiotics: Participants in this group will receive a daily dose of probiotics as an adjunct to standard Neratinib therapy. The probiotics will be administered orally as a granule formulation dissolved in water, for a total duration of 6 weeks (two treatment cycles). Loperamide will be administered prophylactically according to the FDA-recommended schedule to prevent Neratinib-associated diarrhea. The aim is to assess the efficacy of probiotics in reducing Neratinib-induced diarrhea and improving quality of life.

Placebo: Participants in this group will receive a daily dose of a placebo that is identical in appearance, taste, and administration method to the probiotic granules, in addition to standard Neratinib therapy. The placebo will be administered orally as a granule formulation dissolved in water, for a total duration of 6 weeks. Loperamide will also be administered prophylactically to all participants in accordance with FDA recommendations. This group will serve as a control to evaluate the true effect of probiotics on Neratinib-induced diarrhea.

Loperamide: All participants will receive prophylactic loperamide to reduce the risk of Neratinib-induced diarrhea. Loperamide will be administered according to the FDA-recommended schedule: 4 mg TID for the first 14 days of treatment, then 4 mg BID from Day 15 to Day 42. This intervention is implemented as a standard supportive therapy and not as a randomized variable.

Study summary

This study aims to evaluate the efficacy and safety of probiotics for the prevention of diarrhea in patients with breast cancer receiving the tyrosine kinase inhibitor (TKI) Neratinib.

Study Design: This is a prospective, randomized controlled clinical trial. Participants will be randomly assigned to either a probiotics intervention group or a placebo-controlled group. Both groups will receive prophylactic loperamide according to the FDA-recommended dosing schedule for neratinib-associated diarrhea.

Primary Objective: To evaluate the efficacy of probiotics in reducing the incidence and severity of diarrhea in patients receiving Neratinib.

Secondary Objectives: This study will also investigate the effects of probiotics on gut microbiota composition and their potential impact on drug efficacy.

Study Duration: Enrollment is planned from August 2025 to June 2027 at Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University. Both the intervention and control groups will receive treatment for a total of six weeks (two cycles of three weeks each). No post-treatment observation period is included.

Eligibility Criteria: Participants must be diagnosed with HER2-positive breast cancer and scheduled to receive Neratinib. Exclusion criteria include patients with severe gastrointestinal disorders or recent probiotic consumption.

Eligibility

Sex

FEMALE

Min age

18 Years

Max age

—

Healthy volunteers

Inclusion Criteria Participants must meet all of the following criteria: 1. Female patients aged ≥18 years, diagnosed with HER2-positive breast cancer. 2. Scheduled to receive Neratinib therapy (monotherapy or in combination), based on clinical guidelines. 3. Eastern Cooperative Oncology Group (ECOG) performance status ≤ 2, with an expected survival of at least 3 months. 4. Left ventricular ejection fraction (LVEF) ≥ 50%. 5. Resolution of any prior treatment-related toxicity to Grade ≤1 (per CTCAE v5.0), with AST and ALT ≤ 2.5 × the upper limit of normal (ULN), and total bilirubin ≤ 1.5 × ULN. 6. Adequate bone marrow function, defined as: White blood cell count ≥ 3.0 × 10⁹/L Neutrophil count ≥ 1.5 × 10⁹/L Platelet count ≥ 100 × 10⁹/L Hemoglobin ≥ 90 g/L Serum creatinine ≤ 1.5 × ULN 7. No persistent gastrointestinal symptoms, such as hematochezia, chronic constipation, or abdominal pain. 8. No evidence of structural gastrointestinal abnormalities confirmed by gastroscopy or other relevant examinations. Exclusion Criteria Participants will be excluded if they meet any of the following criteria: 1. Conditions that significantly impair swallowing, digestion, or gastrointestinal drug absorption. 2. History of chronic gastrointestinal diseases, including but not limited to inflammatory bowel disease (IBD), gastrointestinal tumors, or malabsorption syndromes. 3. Severe cardiovascular diseases that may interfere with study treatment, including but not limited to: Life-threatening arrhythmias Advanced atrioventricular block Unstable angina Clinically significant pericardial disease Myocardial fibrosis Uncontrolled hypertension 4. Known hypersensitivity to any component of Neratinib, probiotics, placebo, or loperamide. 5. Prior participation in any clinical trial involving investigational drugs within 4 weeks prior to enrollment, or chronic use of medications that may induce constipation within 6 months. 6. Pregnant or lactating women, or those unwilling to use effective contraception during the study period. 7. Any medical, psychiatric, or social condition that, in the investigator's judgment, could compromise the safety of the participant, interfere with study participation, or confound the study results.

Primary outcome measure(s)

Incidence of Grade ≥3 Diarrhea — Up to 6 weeks
The incidence of grade 3 or higher diarrhea during the 6-week treatment period, assessed using the Common Terminology Criteria for Adverse Events (CTCAE) version 5.0.

Trial sites (1)

Facility	City	Region	Status
Breast Tumor Center, Sun Yat-sen Memorial Hospital, Sun Yat-sen University	Guangzhou	Guangdong	Recruiting

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Official registry record

This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.

View NCT06892093 on ClinicalTrials.gov ↗ ← All trials in China