The purpose of this study is to measure the amount of belimumab in the blood when given as an injection under the skin (subcutaneously; SC) and to evaluate the safety and tolerability of multiple injections under the skin in healthy subjects.
This study is designed to evaluate the absolute bioavailability, pharmacokinetics, tolerability, and safety of a single dose (groups 1-4) or multiple doses (groups 5-6) of belimumab administered subcutaneously (SC) to healthy subjects.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
118
Belimumab IV 240 mg administered on Day 0
Belimumab SC 120 mg x 2 injections (equal to 240 mg) administered immediately one after the other on Day 0
Belimumab SC 240 mg x 1 injection on Day 0
Unnamed facility
Daytona Beach, Florida, United States
Unnamed facility
Evansville, Indiana, United States
Unnamed facility
Dallas, Texas, United States
Unnamed facility
Madison, Wisconsin, United States
Time to Reach Maximum Serum Drug Concentration (Tmax) Following a Single Dose of Belimumab Given as Intravenous Infusion (IV) or Subcutaneous Injection (SC)
Time frame: Pre-dose, Post-dose on Days 0, 1, 2, 3, 4, 5, 6, 7, 10, 14, 21, 28, 42, 56, and 70
Maximum Serum Drug Concentration (Cmax) Following a Single Dose of Belimumab Given as IV or SC
Time frame: Pre-dose, Post-dose on Days 0, 1, 2, 3, 4, 5, 6, 7, 10, 14, 21, 28, 42, 56, and 70
Area Under the Serum Drug Concentration-time Curve From Time 0 to Infinite Time (AUC0-∞) Following a Single Dose of Belimumab Given as IV or SC
AUC (0-∞) = Area under the serum drug concentration versus time curve (AUC) from time zero (pre-dose) to extrapolated infinite time (0-∞). It is obtained from AUC (0-last) plus C (last)/λz. C (last) is the last measurable concentration. λz was determined by linear regression (r2 ≥ 0.8) with uniform weighting of all data in the terminal linear portion of the log-transformed drug concentration-time profile.
Time frame: Pre-dose, Post-dose on Days 0, 1, 2, 3, 4, 5, 6, 7, 10, 14, 21, 28, 42, 56, and 70
Terminal Elimination Half-life (t1/2,Term) Following a Single Dose of Belimumab Given as IV or SC
Terminal elimination half-life is the time measured for the serum drug concentration of belimumab to decrease by one half.
Time frame: Pre-dose, Post-dose on Days 0, 1, 2, 3, 4, 5, 6, 7, 10, 14, 21, 28, 42, 56, and 70
Absolute Bioavailability of a Single Dose of Belimumab Given as IV or SC
Bioavailability (F) is a measurement of the rate and extent to which a drug reaches the systemic circulation. The bioavailability of belimumab administered by IV is compared to the bioavailability of belimumab administered via single-SC injection.
Time frame: Pre-dose, Post-dose on Days 0, 1, 2, 3, 4, 5, 6, 7, 10, 14, 21, 28, 42, 56, and 70
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Belimumab SC 200 mg x 1 injection on Day 0
Belimumab 120 mg x 2 injections (equal to 240 mg) administered immediately one after the other on Days 0, 7, 14, and 21
Belimumab 200 mg x 1 injection administered on Days 0, 7, 14, and 21
Time to Reach Maximum Serum Drug Concentration (Tmax) Following Weekly (x 4) SC Injections of Belimumab
Time frame: Pre-dose, Post-dose on Days 0, 1, 2, 3, 4, 5, 6, 7, 14, 21, 22, 23, 24, 25, 26, 27, 28, 31, 35, 42, 49, 63, 77, 91, and 119
Maximum Serum Drug Concentration (Cmax) Following Weekly (x 4) SC Injections of Belimumab
Time frame: Pre-dose, Post-dose on Days 0, 1, 2, 3, 4, 5, 6, 7, 14, 21, 22, 23, 24, 25, 26, 27, 28, 31, 35, 42, 49, 63, 77, 91, and 119
Area Under the Serum Drug Concentration-time Curve From Time 0 to Infinite Time (AUC0-∞) Following Weekly (x 4) SC Injections of Belimumab
AUC (0-∞) = Area under the serum drug concentration versus time curve (AUC) from time zero (pre-dose) to extrapolated infinite time (0-∞). It is obtained from AUC (0-last) plus C (last)/λz. C (last) is the last measurable concentration. λz was determined by linear regression (r2 ≥ 0.8) with uniform weighting of all data in the terminal linear portion of the log-transformed drug concentration-time profile.
Time frame: Pre-dose, Post-dose on Days 0, 1, 2, 3, 4, 5, 6, 7, 14, 21, 22, 23, 24, 25, 26, 27, 28, 31, 35, 42, 49, 63, 77, 91, and 119
Terminal Elimination Half-life (t1/2,Term) Following Weekly (x 4) SC Injections of Belimumab
Terminal elimination half-life is the time measured for the serum drug concentration of belimumab to decrease by one half.
Time frame: Pre-dose, Post-dose on Days 0, 1, 2, 3, 4, 5, 6, 7, 14, 21, 22, 23, 24, 25, 26, 27, 28, 31, 35, 42, 49, 63, 77, 91, and 119
Absolute Bioavailability of Weekly (x 4) SC Injections of Belimumab
Bioavailability (F) is a measurement of the rate and extent to which a drug reaches the systemic circulation. The bioavailability following weekly (x 4) SC injections of belimumab was calculated by comparing the bioavailability of belimumab administered IV to the bioavailability of belimumab administered via 4 weekly SC injections.
Time frame: Pre-dose, Post-dose on Days 0, 1, 2, 3, 4, 5, 6, 7, 14, 21, 22, 23, 24, 25, 26, 27, 28, 31, 35, 42, 49, 63, 77, 91, and 119
Number of Participants Who Experienced Adverse Events
Includes AEs reported in participants from the first dose of belimumab throughout the study through Day 70/Exit (single dose groups) or Day 119/Exit (multiple dose groups).
Time frame: Up to Day 119