XmAb5871 Bioavailability Study

Study Overview
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Brief Summary
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An open label comparison of concentration of the study medication administered intravenously (IV) versus subcutaneously (SC) in healthy volunteers.

Detailed Description
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The study will enroll approximately 50 eligible healthy male and female subjects between the ages of 18 to 55 inclusive. There will be 5 parallel dose cohorts (Cohorts 1-5) consisting of 10 subjects in each cohort. No subject will be a member of more than 1 cohort. Subjects will receive 3 administrations of study medication.

Official Title
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Pharmacokinetics and Relative Bioavailability of XmAb®5871 Administered Either Intravenously or Subcutaneously

Conditions
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Healthy Volunteers

Intervention / Treatment
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* Drug: XmAb5871


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Are adult males and females aged 18 to 55 years inclusive as of dosing (Day 1) with total body weight between 45.0 and 100.0 kg inclusive and body mass index (BMI) between 19.0 and 32.0 kg/m2 inclusive; Healthy as assessed by the Investigator with no clinically significant abnormality identified on medical or laboratory evaluation and no history of any clinically significant disorder, condition, or disease that would pose a risk to subject safety or interfere with the study evaluation, procedures, or completion; Exclusion Criteria: Subjects who have a clinically relevant history or presence of respiratory, gastrointestinal, renal, hepatic, hematological, lymphatic, neurological, cardiovascular, psychiatric, musculoskeletal, genitourinary, immunological, dermatological, connective tissue diseases or disorders that would pose a risk to subject safety or interfere with the study evaluation, procedures, or completion. Subjects who are positive for drugs of abuse or alcohol on screening or admission; Subject is pregnant or breast feeding, or planning to become pregnant within 3 months of administration of XmAb5871. Subjects who have used prescription drugs (with the exception of hormonal birth control for women of child-bearing potential) within 14 days or 5 half-lives, whichever is longer, prior to dosing (Day 1), unless agreed as not clinically relevant by the Principal Investigator and Sponsor. Subjects who have received live vaccines ≤3 months from Day 1. Malignancy within 5 years (except successfully treated in situ cervical cancer, resected squamous cell or basal cell carcinoma of the skin). Unable or unwilling to partake in follow-up assessments or required protocol procedures.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 55 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: Other
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Cohort 1<br>Dose Level 1 XmAb5871 given SC Q14days X 3 | Drug: XmAb5871<br> <br> |
| Experimental: Cohort 2<br>Dose Level 2 XmAb5871 given SC Q14days X 3 | Drug: XmAb5871<br> <br> |
| Experimental: Cohort 3<br>Dose Level 3 XmAb5871 given SC Q14days X 3 | Drug: XmAb5871<br> <br> |
| Experimental: Cohort 4<br>Dose Level 4 XmAb5871 given IV Q14days X 3 | Drug: XmAb5871<br> <br> |
| Experimental: Cohort 5<br>Dose Level 5 XmAb5871 given SC Q7days X 3 | Drug: XmAb5871<br> <br> |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Cmax, Maximum observed serum concentration |  | Date of enrollment to Day 57 | 
| Tmax, Time of maximum observed serum concentration |  | Date of enrollment to Day 57 | 
| AUC, Area under the plasma concentration versus time curve |  | Date of enrollment to Day 57 | 
| CL, Clearance of drug from the body |  | Date of enrollment to Day 57 | 
| Vz, Volume of distribution |  | Date of enrollment to Day 57 | 
| F, bioavailability of a SC dose relative to an IV dose |  | Date of enrollment to Day 57 | 
| Number of participants with adverse events that are related to treatment |  | Date of enrollment to Day 57 | 
| Number of participants with severe adverse events that are related to treatment |  | Date of enrollment to Day 57 | 
| Number of participants with abnormal laboratory values related to treatment |  | Date of enrollment to Day 57 | 
| Number of participants with abnormal ECGs related to treatment |  | Date of enrollment to Day 57 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Titers of anti-XmAb5871 antibody will be assessed from time of dosing up to Day 57 |  | Date of enrollment to Day 57 | 
| Percent of participants positive in the assay at at least one time point |  | Date of enrollment to Day 57 | 
| Percent of participants with increasing titers of anti-drug antibody over time |  | Date of enrollment to Day 57 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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healthy, volunteer