A Study to Investigate the Safety, Tolerability, and Pharmacokinetics of MHAB5553A in Healthy Volunteers

Study Overview
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Brief Summary
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This is a Phase 1, randomized, double-blind, placebo-controlled, single-ascending dose study in healthy volunteers to investigate the safety, tolerability, and pharmacokinetics (PK) of MHAB5553A.

Official Title
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A Phase 1, Randomized, Double-blind, Placebo-controlled, Single-ascending Dose Study to Investigate the Safety, Tolerability, and Pharmacokinetics of MHAB5553A in Healthy Volunteers

Conditions
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Healthy Volunteer

Intervention / Treatment
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* Drug: MHAB5553A
* Drug: Matching placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Signed informed consent form (ICF) Body mass index (BMI) between 18 and 32 kg/m2, inclusive Weight 40-100 kg In good health, determined by no clinically significant findings from medical history, 12-lead ECG, and vital signs Clinical laboratory evaluations should be within reference range for the test, unless deemed not clinically significant by the investigator and sponsor at screening Willing to abstain from using drugs of abuse while enrolled in the study Willing and able to comply with protocol-specified criteria in regard to contraceptive protection Able to comply with the study protocol, in the investigator's judgment Exclusion Criteria: History or clinically significant manifestations of metabolic, hepatic, renal, hematologic, immunodeficiency, pulmonary, cardiovascular, gastrointestinal, urologic, neurologic, or psychiatric disorders History of anaphylaxis, hypersensitivity or drug allergies, unless approved by the investigator and sponsor History or presence of an abnormal ECG, which, in the investigator's or sponsor's opinion, is clinically significant (including evidence of previous acute myocardial infarction, complete left bundle branch block, second-degree heart block, or complete heart block) History of significant alcohol abuse within 1 year prior to screening or regular use of alcohol within 6 months prior to the screening visit History of significant drug abuse within 1 year prior to screening or use of soft drugs (such as marijuana) within 3 months prior to screening visit or hard drugs (such as cocaine, phencyclidine [PCP], and crack) within 1 year prior to screening Current tobacco smokers (positive history within 3 months before initiation of dosing on Day 1), or those with positive cotinine test at check-in Positive drug screen at screening or at check-in Positive pregnancy test result at screening or Day -1 or breast feeding during the study Any serious medical condition or abnormality in clinical laboratory tests that, in the investigator's judgment, precludes the participant's safe enrollment in and completion of the study Unwillingness to comply or other conditions that, in the opinion of the investigator, would interfere with the ability to comply with the study protocol

Ages Eligible for Study
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Minimum Age: 18 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

Primary Purpose: Basic Science
Allocation: Randomized
Intervention Model: Single Group Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Cohort A<br> | Drug: MHAB5553A<br>* Single intravenous administration, at various doses, depending on the cohort<br>Drug: Matching placebo<br>* Single intravenous dose<br>|
| Experimental: Cohort B<br> | Drug: MHAB5553A<br>* Single intravenous administration, at various doses, depending on the cohort<br>Drug: Matching placebo<br>* Single intravenous dose<br>|
| Experimental: Cohort C<br> | Drug: MHAB5553A<br>* Single intravenous administration, at various doses, depending on the cohort<br>Drug: Matching placebo<br>* Single intravenous dose<br>|
| Experimental: Cohort D<br> | Drug: MHAB5553A<br>* Single intravenous administration, at various doses, depending on the cohort<br>Drug: Matching placebo<br>* Single intravenous dose<br>|
| Experimental: Cohort E<br> | Drug: MHAB5553A<br>* Single intravenous administration, at various doses, depending on the cohort<br>Drug: Matching placebo<br>* Single intravenous dose<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Incidence of adverse events, graded by severity |  | Until study discontinuation/termination, up to 120 days | 
| Changes in vital signs during and following MHAB5553A administration |  | Throughout the study, up to 120 days | 
| Changes in physical examination finding during and following MHAB5553A administration |  | Throughout the study, up to 120 days | 
| Changes in clinical laboratory results during and following MHAB5553A administration |  | Throughout the study, up to 120 days | 
| Changes in electrocardiogram (ECG) findings during and following MHAB5553A |  | Throughout the study, up to 120 days | 
| Incidence of serum anti-MHAB5553A antibodies |  | Until study discontinuation/termination, up to 120 days | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Maximum serum concentration (Cmax) of MHAB5553A |  | Up to 120 days | 
| Time to Cmax (tmax) of MHAB5553A |  | Up to 120 days | 
| Area under the concentration-time curve up to last measurable time point (AUC0-last) of MHAB5553A |  | Up to 120 days | 
| Area under the concentration-time curve extrapolated to infinity (AUC0-inf) of MHAB5553A |  | Up to 120 days | 
| Clearance (CL) of MHAB5553A |  | Up to 120 days | 
| Volume of distribution at steady-state (Vss) of MHAB5553A |  | Up to 120 days | 
| Terminal elimination half-life (t1/2) of MHAB5553A |  | Up to 120 days | 
| Mean Residence Time (MRT) of MHAB5553A |  | Up to 120 days |