A Two-part, Single-dose, Randomized Study to Evaluate the Safety of Supra-therapeutic Doses of RO7033877 and to Investigate the Effect of RO7033877 on the QTc Interval

Study Overview
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Brief Summary
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This is a two-part study to evaluate the safety and tolerability of supratherapeutic doses of RO7033877 (Part 1) and to investigate the effect of RO7033877 on the QTc interval in healthy volunteers (Part 2). Part 1 is a single ascending dose, randomized, observer-blind, placebo-controlled study to determine the safety tolerability and pharmacokinetics of a supratherapeutic dose to be used in Part 2. Participants will be randomized in up to 8 cohorts to receive a single dose of either RO7033877 or placebo. Part 2 will be a single dose, randomized, double-blind, double dummy, placebo-controlled, positive control, 4-way crossover study. Part 2 will evaluate whether a single therapeutic or supratherapeutic dose of RO7033877 has a threshold pharmacologic effect on cardiac repolarization, as detected by changes in the QT/QTc interval measured by electrocardiogram (ECG). Pharmacokinetic parameters will be assessed for Parts 1 and 2, continuous ECG recordings will be evaluated in Part 2.

Official Title
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A Two-part, Single-center, Single-dose, Randomized, Double-blind, Double-dummy, Placebo-controlled, Positive-controlled, Four-way Crossover Study to Investigate the Effect of RO7033877 on the QT/QTc Interval in Healthy Subjects

Conditions
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Healthy Volunteer

Intervention / Treatment
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* Drug: Part 1: SAD RO7033877
* Drug: Part 1: SAD placebo
* Drug: Part 2: Treatment A, RO7033877
* Drug: Part 2: Treatment B, RO7033877
* Drug: Part 2: Treatment C, moxifloxacin
* Drug: Part 2: Treatment D, RO7033877 and moxifloxacin placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Healthy male or female of non-childbearing potential participants, 18 to 65 years of age, inclusive Healthy status is defined as the absence of evidence of any clinically significant, active, or chronic disease following a detailed medical and surgical history, a complete physical examination and vital signs, 12-lead ECG, hematology, blood chemistry, serology and urinalysis and confirmed by a creatinine clearance estimated by formula of Cockcroft-Gault > 80 mL/min/1.73 m2 Postmenopausal or surgically sterile females (bilateral oophorectomy or hysterectomy performed at least 6 months prior to study participation) A body mass index (BMI) between 18 and 30 kg/m2 inclusive and minimum body weight >/= 50 kg, inclusive For men with a female partner(s) of childbearing potential: agreement to use a barrier method of contraception during the treatment period and for at least 3 months after the last dose of study drug Participants who are non-smokers, or former smokers who have not smoked for at least 45 days prior to screening (former smokers are to have a total of < 10 pack year smoking history) Exclusion Criteria: Women of childbearing potential Pregnant or lactating women Men with female partners who are lactating or are pregnant History of any clinically significant disease, e.g. gastrointestinal, renal, hepatic, cardiovascular, endocrine, hematologic or allergic disease(s), metabolic disorder, cancer (may have had basal or squamous cell carcinoma of skin or cervix as long as surgically removed or deemed cured by cryotherapy, laser therapy, conization, etc., with stability for the past 2 years) Any major illness within one month before the first dose of study drug or any febrile illness within one week prior to screening and up to first dose administration Any prescribed medications taken within 4 weeks prior to first dosing or within 5 times the elimination half-life of the medication prior to first dosing (whichever is longer) Any preparations containing St. John's Wort taken within 4 weeks prior to first dosing Any other over-the-counter medications, including vitamins or herbal remedies, taken within 14 days prior to first dosing or within 5 times the elimination half-life of the medication prior to first dosing (whichever is longer); acetaminophen is the only exception Taking any nutrients known to modulate cytochrome P450 (CYP) 3A activity. Participants will be instructed to abstain from consuming grapefruit, Seville oranges, and grapefruit- or Seville orange-containing products within 2 weeks prior to administration of study drugs Regular consumption of large amounts of caffeine or xanthine-containing substances (e.g. >/= 5 cups of coffee/day, tea, cola, Mountain Dew, chocolate, diet pills, energy drinks or any other type of stimulant) or unable to refrain from consumption of caffeine or xanthine-containing substances from 72 hours prior to each entry in the clinic and during the in-house periods Any medication that inhibits active tubular secretion (e.g. probenecid, H2 receptor antagonists, trimethoprim) within 4 weeks prior to first dosing Participation in an investigational drug or device study within 60 days prior to screening Concomitant disease or condition that could interfere with, or treatment of which might interfere with, the conduct of the study, or that would, in the opinion of the investigator, pose an unacceptable risk to the subject in this study History and/or family history of cardiac anomalies, e.g. congenital long QT syndrome, unexplained syncope, or clinically significant abnormal ECG ECG evidence at screening or baseline of, e.g. atrial fibrillation, atrial flutter, complete right or left bundle branch block and/or clinically relevant prolongation of the PR interval as determined by the Investigator Exclusion criteria for Part 2 only: History of allergy or sensitivity to moxifloxacin or other fluoroquinolones, and/or history of tendon rupture when taking or considered time-wise related to consumption of a fluoroquinolone

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Placebo Comparator: Part 1: Placebo<br>Saline solution, given as a minimum of a 2 hour infusion | Drug: Part 1: SAD placebo<br>* Single dose<br>|
| Experimental: Part 1: RO7033877<br>Single ascending dose | Drug: Part 1: SAD RO7033877<br>* Single dose<br>|
| Experimental: Part 2: RO7033877<br>Single-dose 4-way crossover | Drug: Part 2: Treatment A, RO7033877<br>* Single dose RO7033877 and moxifloxacin placebo<br>Drug: Part 2: Treatment B, RO7033877<br>* Single dose RO7033877 and moxifloxacin placebo<br>Drug: Part 2: Treatment C, moxifloxacin<br>* Single dose moxifloxacin and RO7033877 placebo<br>Drug: Part 2: Treatment D, RO7033877 and moxifloxacin placebo<br>* Single dose moxifloxacin placebo and RO7033877 placebo<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Part 1: Incidence of adverse events (AEs) after single, supratherapeutic dose of RO7033877 |  | Up to 30 days | 
| Part 1: Pharmacokinetic parameters derived from plasma and urine concentrations, single dose of RO7033877: Area under the curve (AUC) |  | Day 1 | 
| Part 2: Continuous, 12-lead Holter electrocardiogram (ECG) recordings |  | Day -1 and 1 of each Period | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Incidence of AEs after single IV infusion of RO7033877 |  | Up to 9 weeks | 
| Part 2 only: Changes in other ECG parameters, descriptive analysis |  | Up to 9 weeks | 
| Part 2 only: Changes in PK/PD relationships between any effect on ECG and RO7033877 plasma concentrations, descriptive analysis |  | Up to 9 weeks | 
| Part 2: Area under the concentration-time curve (AUC) of RO7033877 |  | Day 1 of each Period |