The purpose of this study is to implement a substudy in approximately 120 rheumatoid arthritis (RA) subjects to compare the steady-state serum trough concentration (Cminss), Cmax and area under the curve (AUC) during the dosing interval (TAU) of subcutaneous (SC) Abatacept injection of 125 mg via the autoinjector and via the BD Hypak™ Physiolis prefilled syringe.
Study Classification: * Safety: show if the drug is safe under conditions of proposed use * Efficacy: measure of an intervention's influence on a disease or health condition * Safety/Efficacy * Pharmacokinetics: the action of a drug in the body over a period of time including the process of absorption, distribution and localization in tissue, biotransformation, and excretion of the compound.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
TREATMENT
Masking
NONE
Enrollment
120
Pharmacokinetic (PK) Analysis: Adjusted Geometric Mean Observed Serum Trough Concentration at Steady State (Cminss) of Abatacept Using a Prefilled Syringe (Measured on Day 29) and Using an Autoinjector (Measured on Day 113)
Abatacept SC was self-administered with a prefilled syringe every 7 days for the first 4 weeks until Day 29; Blood samples for PK were taken pre-dose (0 hour) on Days 29 and 113. Serum concentrations of abatacept were analyzed using a validated enzyme-linked immunosorbent assay (ELISA). Steady-state trough observed concentration in serum (Cminss) was measured in micrograms/milliliter (μg/mL). Adjusted geometric mean and 90% confidence interval (CI) are presented.
Time frame: Day 29, Day 113
PK Analysis: Geometric Mean of Maximum Observed Serum Concentration (Cmax) of Abatacept During the Sampling Period Between Substudy Days 22 and 29 for the Prefilled Syringe and Between Substudy Days 106 and Day 113 for the Autoinjector
Abatacept SC was self-administered with a BD Hypak™ Physiolis prefilled syringe every 7 days for the first 4 weeks of the substudy until Day 29; Blood samples for PK were taken on Days 1 and 22 at 0 hour (predose), Day 24 at 48 hour (h) post dose, Day 25 at 72 h post dose, Day 26 at 96 h post dose and Day 29 at 0 h (predose). On substudy Day 29, participants were switched from the prefilled syringe to the autoinjector. Participants continued to self-administer abatacept with the autoinjector every 7 days following Day 29 for the remaining 3 months of the substudy; Blood samples for PK were taken on Day 108 at 48 h post dose, Day 109 at 72 h post dose, Day 110 at 96 h post dose and at Day 113 0h (predose). Serum concentrations of abatacept were analyzed using a validated ELISA. Cmax was measured in μg/mL.
Time frame: Days 22, 24, 25, 26, 29 (prefilled syringe); Days 106, 108, 109, 110, 113 (autoinjector)
PK Analysis: Median Time to Achieve Cmax (Tmax) During the Sampling Period Between Days 22 and 29 for the Prefilled Syringe and Between Days 106 and Day 113 for the Autoinjector
Abatacept SC was self-administered with a BD Hypak™ Physiolis prefilled syringe every 7 days for the first 4 weeks of the substudy until Day 29; Blood samples for PK were taken on Days 1 and 22 at 0 hour (predose), Day 24 at 48 hour (h) post dose, Day 25 at 72 h post dose, Day 26 at 96 h post dose and Day 29 at 0 h (predose). On substudy Day 29, participants were switched from the prefilled syringe to the autoinjector. Participants continued to self-administer abatacept with the autoinjector every 7 days following Day 29 for the remaining 3 months of the substudy; Blood samples for PK were taken on Day 108 at 48 h post dose, Day 109 at 72 h post dose, Day 110 at 96 h post dose and at Day 113 0h (predose). Serum concentrations of abatacept were analyzed using a validated ELISA. Tmax was measured in hours (h).
This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.
Time frame: Days 22, 24, 25, 26, 29 (prefilled syringe); Days 106, 108, 109, 110,113 (autoinjector)
Geometric Mean of Area Under Serum Concentration-time (AUC) During a Dosing Interval (TAU) of Abatacept During the Sampling Period Between Days 22 and 29 for the Prefilled Syringe and Between Days 106 and Day 113 for the Autoinjector
Abatacept SC was self-administered with a BD Hypak™ Physiolis prefilled syringe every 7 days for the first 4 weeks of the substudy until Day 29; Blood samples for PK were taken on Days 1 and 22 at 0 hour (predose), Day 24 at 48 hour (h) post dose, Day 25 at 72 h post dose, Day 26 at 96 h post dose and Day 29 at 0 h (predose). On substudy Day 29, participants were switched from the prefilled syringe to the autoinjector. Participants continued to self-administer abatacept with the autoinjector every 7 days following Day 29 for the remaining 3 months of the substudy; Blood samples for PK were taken on Day 106 at 0 h (predose), Day 108 at 48 h post dose, Day 109 at 72 h post dose, Day 110 at 96 h post dose and at Day 113 0h (predose). Serum concentrations of abatacept were analyzed using a validated ELISA. AUC(TAU) where TAU = 168 hours was calculated in µg\*h/mL
Time frame: Days 22, 24, 25, 26,29 (prefilled syringe); Days 106, 108, 109, 110, 113 (autoinjector)
Geometric Mean of Trough Serum Concentration (Cmin) Over Time and During the Switch From Prefilled Syringe to Autoinjector on Days 22, 29, 57, 85, 106, and 113
Abatacept SC was self-administered with a BD Hypak™ Physiolis prefilled syringe every 7 days for the first 4 weeks of the substudy until Day 29; Blood samples for PK were taken at 0 hour (predose). On substudy Day 29, participants were switched from the prefilled syringe to the autoinjector. Participants continued to self-administer abatacept with the autoinjector every 7 days following Day 29 for the remaining 3 months of the substudy. Blood samples for PK were taken at 0 hour (predose). Serum concentrations of abatacept were analyzed using a validated ELISA. Steady-state trough observed concentration in serum (Cminss) was measured in micrograms/milliliter (μg/mL).
Time frame: Days 22, 29, 57, 85, 106, and 113
Number of Participants With Positive Anti-Abatacept or Anti-CTLA4 Antibody Responses by Electrochemiluminescence (ECL) on Day 29 and Day 113.
Serum samples for immunogenicity were evaluated for presence of anti-abatacept antibodies using a validated bridging ECL on Day 29 and Day 113. The ECL assay differentiated between 2 antibody specificities: the immunoglobulin (Ig) G and/or junction region and cytotoxic leukocyte antigen 4 (CTLA4) and possibly Ig. A positive immunogenicity response relative to baseline was defined as: A missing baseline immunogenicity measurement and a positive analytical laboratory reported immunogenicity response post-baseline; A negative baseline immunogenicity response and a positive analytical laboratory reported immunogenicity response post-baseline; A positive baseline immunogenicity response and a positive analytical laboratory reported immunogenicity response post-baseline that has a titer value strictly greater than the baseline titer value.
Time frame: Days 29 and 113