A Study to Evaluate the Effects of Ibrutinib on Cardiac Repolarization in Healthy Participants

The study consists of 2 parts: Part 1 and Part 2. Part 1 is an open-label (a medical research study in which participants and researchers are told which treatments the participants are receiving), single-center, 2-period, sequential design part. It consists of a Screening phase (Day-21 to -2), Treatment Period 1 and Treatment Period 2. In treatment period 1, 8 participants including two women will receive 840 milligram (mg) ibrutinib capsules + 6 placebo capsules. In treatment period 2, participants will receive 1680 mg ibrutinib capsules. Treatment periods will be separated by a Washout period of not less than 7 days. A high-fat breakfast will be provided 2 hours before dosing. Blood samples will be collected after each dosing for pharmacokinetic assessments.

Part 2 is a randomized (the study medication is assigned by chance), placebo (an inactive substance that is compared with a medication to test whether the medication has a real effect in a clinical study) and positive-controlled (participants are assigned to either a recognized effective treatment or the study medication), double-blind (neither physician nor participant knows the treatment that the participant receives), single dose, and 4-way crossover (the same medications are provided to all participants but in a different sequence) part. Participants will receive either of the 4 treatments: Treatment A (Ibrutinib 1680 mg + moxifloxacin-matching placebo); Treatment B (Ibrutinib 840 mg+ ibrutinib-matching placebo + moxifloxacin-matching placebo); Treatment C (ibrutinib-matching placebo + moxifloxacin-matching placebo); and Treatment D: (moxifloxacin 400 mg + ibrutinib-matching placebo). Each treatment period will be separated by a Washout period of not less than 7 days. Electrocardiogram (ECG) will be recorded. Participants' safety will be monitored throughout the study.

Inclusion criteria

• Must sign an informed consent document indicating they understand the purpose of the study and procedures
• Must have a body mass index (BMI) of between 18 and 30 kg/m^2, inclusive
• Must have a body weight of not less than 50 kg
• Must have a blood pressure between 90 and 140 mmHg inclusive, systolic, and no higher than 90 mmHg diastolic at screening
• Must have an average of triplicate 12-lead ECG recordings, completed within 5 minutes total, consistent with normal cardiac conduction and function

Exclusion criteria

• History of or current clinically significant medical illness
• Clinically significant abnormal physical examination, vital signs or 12 lead electrocardiogram
• History of clinically relevant heart rhythm disturbances including atrial, junctional, re-entry, and ventricular tachycardias, and heart blocks
• Use of any prescription or nonprescription medication (including vitamins and herbal supplements
• Donated blood or blood products or had substantial loss of blood within 3 months before screening