Effects of itraconazole or rifampin on rocbrutinib levels in healthy adults.

A Phase I, Open-label, Two-part, Fixed-sequence Drug Interaction Study to Evaluate the Effects of Concomitant Use of the CYP3A4 Inhibitor Itraconazole or the CYP3A4 Inducer Rifampin on the Pharmacokinetics of Rocbrutinib in Healthy Subjects

This test will see if the antifungal itraconazole or the antibiotic rifampin change how rocbrutinib is absorbed, distributed, and cleared in healthy adults.

Quick facts

• Phase: Phase 1
• Study type: Interventional
• Enrollment: 28 (estimated)
• Ages: 18 Years to 45 Years
• Sex: All
• Sponsor: Guangzhou Lupeng Pharmaceutical Company LTD. (Industry-sponsored)
• Drugs / interventions: Rocbrutinib
• Locations: 1 site (Beijing, Beijing Municipality)
• Trial ID: NCT07374224 on ClinicalTrials.gov

What this trial studies

This open-label, Phase 1, two-part fixed-sequence study gives rocbrutinib alone and then with either itraconazole (a strong CYP3A inhibitor) or rifampin (a strong CYP3A inducer) to healthy adult volunteers to measure changes in rocbrutinib pharmacokinetics. Serial blood samples are collected to compare rocbrutinib concentrations over time and to measure coproporphyrin I (CP‑I) as a marker of OATP1B inhibition. The study also examines P‑gp effects by co-administering rocbrutinib with rifampicin as a single dose and with itraconazole at steady state. Results will quantify how CYP3A enzymes and transporters affect rocbrutinib exposure.

Who should consider this trial

Good fit: Healthy adults aged 18–45 without significant medical conditions who agree to required contraception and study procedures are ideal candidates.

Not a fit: People seeking direct therapeutic benefit—such as patients taking rocbrutinib for disease—or those outside the age, weight, or health criteria are unlikely to benefit because this is a healthy volunteer pharmacokinetic interaction study.

Why it matters

Potential benefit: If successful, the results could help doctors avoid dangerous drug interactions and choose safer doses when prescribing rocbrutinib.

How similar studies have performed: Similar drug–drug interaction studies using itraconazole and rifampin are a standard, well-established approach and commonly show clear effects on exposure for CYP3A substrates.

Eligibility criteria

Inclusion Criteria:

* Subjects had no history of serious digestive system (such as inflammatory bowel disease, chronic diarrhea, Crohn's disease, autonomic dysfunction affecting gastric emptying), nervous system, cardiovascular system, genitourinary system, respiratory system, metabolic and endocrine system, musculoskeletal system, hematologic system diseases, or tumors
* Subjects must agree to complete abstinence or use effective physical contraception (including sterilization, intrauterine device or barrier contraception) from the time of signing the informed consent form until 90 days after the last dose of medication, and have no plans to donate sperm or eggs during this period; if female subjects are using hormonal contraceptives, they must stop using them \>14 days before the first dose and use at least one of the above contraceptive methods.
* Must be between 18 and 45 years old (inclusive) and be male or female when signing the informed consent form.
* Males weighing ≥50.0 kg or females weighing ≥45.0 kg, with a Body Mass Index (BMI) between 18.0 and 28.0 kg/m² (inclusive). BMI = weight (kg) / height² (m²).
* Able to understand and comply with the requirements of the research plan.
* Voluntarily participate in this study and sign the informed consent form.

Exclusion Criteria:

* Abnormalities in screening tests, such as vital signs, physical examination, or laboratory tests are clinically significant and may increase the risk of participants participating in the study or affect the scientific validity of the study.
* Abnormal electrocardiogram or myocardial enzyme levels that are clinically significant as determined by a clinician include, but are not limited to: QTcF ≥ 450 ms (corrected using the Fridricia formula, QTcF = QT/RR1/3, RR = 60/HR), etc.
* The test results for at least one of the following are positive: hepatitis B surface antigen (HBsAg), hepatitis C virus (HCV) antibody, human immunodeficiency virus (HIV) antibody, and syphilis-specific antibody.
* Patients who have taken the investigational drug within 4 weeks prior to or are required to take any drugs known to alter liver enzyme activity during the study period.
* The patient must have used any systemic medications (including any vaccines, prescription drugs, over-the-counter drugs, and traditional Chinese medicines), special medical purpose foods, or health supplements within two weeks prior to taking the investigational drug.
* Had consumed foods known to alter liver enzyme activity (such as grapefruit, star fruit, dragon fruit, and their fruit juices) and tobacco (including e-cigarettes) within one week prior to taking the investigational drug.
* Consume any food or beverage containing caffeine, tea, alcohol, or xanthine within 24 hours prior to taking the investigational drug.
* Difficulty swallowing or any condition that affects drug absorption, distribution, metabolism, or excretion.
* Women with childbearing potential who have a positive pregnancy test result or who are currently breastfeeding.
* Those with a history of smoking (smoking more than 5 cigarettes/day within 3 months prior to screening) or who tested positive for nicotine screening.
* Those with a history of alcohol abuse (consuming more than 14 drinks per week, each drink equivalent to 360 ml of beer, 150 ml of wine, or 50 ml of spirits), or those who test positive for alcohol in a breathalyzer test.
* Those with a history of drug abuse/use, or who test positive in drug abuse screening.
* Those with a known history of any allergic reaction requiring medication (including allergic reactions to drugs or food) or who have an allergic disease.
* Individuals who have donated blood or lost ≥400 ml of blood within the three months prior to screening, or those who plan to donate blood during the study period and within three months after its completion, will be considered.
* Those who have undergone surgery within the past 6 months or are expected to require surgery or hospitalization during the study period will be screened.
* Candidates who have participated in other drug or medical device clinical trials within the three months prior to screening, or who plan to participate in other drug or medical device clinical trials during the study period, are eligible to be screened.
* Subjects with special dietary requirements or who are expected to be unable to comply with the research center's dietary requirements during their hospitalization
* The researchers believe that there are other circumstances that make the participants unsuitable to participate in this study.

Where this trial is running

Beijing, Beijing Municipality

• Peking University Third Hospital — Beijing, Beijing Municipality, China (Recruiting)

Study contacts

• Study coordinator: Dongyang Prof. Liu, PhD

Conditions Clinical Pharmacology; drug interaction; Rocbrutinib; LP-168; CYP3A4