Cmax was derived from serum concentration versus time data. Serum samples were analyzed for abatacept by a validated enzyme-linked immunosorbent assay (ELISA) and were obtained at: predose (0 hours), 0.25 hours (h), 0.5, 1, 2, 6, 12, 24, 72, 168, 336, 504, 672, 1008, 1344, and 1688 h post dose (Days 1 to 71). The results were summarized. The lower limit of assay quantitation (LLOQ) was 1.00 nanograms per milliliter (ng/mL). Cmax was measured in micro grams per milliliter (µg/mL).

Pharmacokinetic (PK) population: all participants who received study drug and had adequate PK profiles. All completers had evaluable PK.

Tmax was derived from serum concentration versus time data. Serum samples were analyzed for abatacept by a validated enzyme-linked immunosorbent assay (ELISA) and were obtained at: predose (0 hours), 0.25 hours (h), 0.5, 1, 2, 6, 12, 24, 72, 168, 336, 504, 672, 1008, 1344, and 1688 h post dose (Days 1 to 71). The results were summarized. The lower limit of assay quantitation (LLOQ) was 1.00 nanograms per milliliter (ng/mL). Tmax was measured in hours (h).

Pharmacokinetic (PK) population: all participants who received study drug and had adequate PK profiles.

AUC (0 - 28) was derived from serum concentration versus time data. Serum samples were analyzed for abatacept by a validated enzyme-linked immunosorbent assay (ELISA) and were obtained at: predose (0 hours), 0.25 hours (h), 0.5, 1, 2, 6, 12, 24, 72, 168, 336, 504, 672, 1008, 1344, and 1688 h post dose (Days 1 to 71). The results were summarized. The lower limit of assay quantitation (LLOQ) was 1.00 nanograms per milliliter (ng/mL). AUC (0 - 28) was measured in micro grams*hours per milliliter (µg*h/mL).

Pharmacokinetic (PK) population: all participants who received study drug and had adequate PK profiles.

AUC (0 - T) was derived from serum concentration versus time data. Serum samples were analyzed for abatacept by a validated enzyme-linked immunosorbent assay (ELISA) and were obtained at: predose (0 hours), 0.25 hours (h), 0.5, 1, 2, 6, 12, 24, 72, 168, 336, 504, 672, 1008, 1344, and 1688 h post dose (Days 1 to 71). The results were summarized. The lower limit of assay quantitation (LLOQ) was 1.00 nanograms per milliliter (ng/mL). AUC (0 - T) was measured in micro grams*hour per milliliter (µg*h/mL).

Pharmacokinetic (PK) population: all participants who received study drug and had adequate PK profiles.

AUC (0 - INF) was derived from serum concentration versus time data. Serum samples were analyzed for abatacept by a validated enzyme-linked immunosorbent assay (ELISA) and were obtained at: predose (0 hours), 0.25 hours (h), 0.5, 1, 2, 6, 12, 24, 72, 168, 336, 504, 672, 1008, 1344, and 1688 h post dose (Days 1 to 71). The results were summarized. The lower limit of assay quantitation (LLOQ) was 1.00 nanograms per milliliter (ng/mL). AUC (0 - INF) was measured in µg*h/mL.

Pharmacokinetic (PK) population: all participants who received study drug and had adequate PK profiles.

T-HALF was derived from serum concentration versus time data. Serum samples were analyzed for abatacept by a validated enzyme-linked immunosorbent assay (ELISA) and were obtained at: predose (0 hours), 0.25 hours (h), 0.5, 1, 2, 6, 12, 24, 72, 168, 336, 504, 672, 1008, 1344, and 1688 h post dose (Days 1 to 71). The results were summarized. The lower limit of assay quantitation (LLOQ) was 1.00 nanograms per milliliter (ng/mL). T-HALF was measured in hours (h).

Pharmacokinetic (PK) population: all participants who received study drug and had adequate PK profiles.

CLT was the volume of abatacept cleared by the system, normalized by baseline body weight. Serum samples were analyzed for abatacept by a validated enzyme-linked immunosorbent assay (ELISA) and were obtained at: predose (0 hours), 0.25 hours (h), 0.5, 1, 2, 6, 12, 24, 72, 168, 336, 504, 672, 1008, 1344, and 1688 h post dose (Days 1 to 71). The results were summarized. The lower limit of assay quantitation (LLOQ) was 1.00 nanograms per milliliter (ng/mL). CLT was measured in milliliters per hours per kilogram of body weight (mL/h/kg).

Pharmacokinetic (PK) population: all participants who received study drug and had adequate PK profiles.

Vss was derived from serum concentration versus time data. Serum samples were analyzed for abatacept by a validated enzyme-linked immunosorbent assay (ELISA) and were obtained at: predose (0 hours), 0.25 hours (h), 0.5, 1, 2, 6, 12, 24, 72, 168, 336, 504, 672, 1008, 1344, and 1688 h post dose (Days 1 to 71). The results were summarized. The lower limit of assay quantitation (LLOQ) was 1.00 nanograms per milliliter (ng/mL). Vss was measured in liters per kg body weight (L/kg).

Pharmacokinetic (PK) population: all participants who received study drug and had adequate PK profiles.

Immunogenicity determination was based on titers of anti-abatacept and anti- cytotoxic T-lymphocyte-associated antigen-4 (CTLA-4-T) antibodies in serum over time. A participant had a positive abatacept-induced immunogenicity if 1 of the following criteria were met: missing baseline measurement and a positive response after baseline; negative baseline response and positive response after baseline; a baseline response and a positive response after baseline that has a titer value strictly greater than the baseline titer value. A validated, sensitive, electrochemiluminescence assay (ECL) method was used to analyze the antibodies in serum. Samples confirmed positive with ECL and with abatacept serum concentrations of less than equal to 1 µg/mL were further analyzed with a validated, in vitro, cell-based bioassay to analyze the sera containing the abatacept neutralizing activity. Samples obtained on Days 29, 57 and 71 post dose of abatacept on Day 1 (baseline).

Immunogenicity Data Set: All participants with at least 1 postdose visit.

Blood samples obtained: Days 1, 2, 4, 8, 15, 22, 29, 43, 57 and 71. International Units per liter (U/L); milligram per deciliter (mg/dL); Male(M); Female (F). Reference ranges (low/high) for laboratories for which participants were identified with marked abnormalities during the study: Blood Urea Nitrogen (M/F) 10-20mg/dL ; Creatine Kinase (F) 21-21 U/L,(M) 32-294 U/L; Direct Bilirubin (M/F) 0.1-0.4 mg/dL ; Fasting Glucose (M/F) 70-110 mg/dL; Lactate Dehydrogenase (M/F) 110-209 U/L.

All participants who received study drug (safety population) and had a laboratory assessment were included in the analysis. Day 2 N=36 both arms; Day 15 (Lonza arm N=36; Devens arm N=34; Day 29 (Lonza arm N=34; Devens arm N=33); Day 57 (Lonza arm N=31; Devens arm N=33); Day 71 (Lonza arm N=36; Devens arm N=34).

Blood samples obtained: Days 2, 4, 8, 15, 22, 29, 43, 57 and 71. Male(M); Female (F). Reference ranges (low/high) for laboratory parameters for which participants were identified with marked abnormalities during the study: Leukocytes (quantitative White blood cells) (M/F) 4-11*10^3/microliters (µL); Neutrophils (absolute)(M/F) 1.4- 8.2*10^3/µL.

All participants who received study drug (safety population) and had a laboratory assessment were included in the analysis. Day 2 N=36 both arms; Day 15 (Lonza arm N=36; Devens arm N=34; Day 29 (Lonza arm N=34; Devens arm N=33); Day 57 (Lonza arm N=31; Devens arm N=33); Day 71 (Lonza arm N=36; Devens arm N=34).

Blood pressure was obtained while the participant had been quietly seated for at least 5 minutes. Baseline was the 0 hour measurement on Day 1 (day of dosing) or if this value was missing, the last measurement before dosing. Blood pressure was measured in millimeters of mercury (mmHg) on Days 1, 2, 15, 29, 57, and 71.

All participants who received study drug (safety population) and had systolic assessment were included in the analysis. Days 1 and 2 N=36 both arms; Day 15 (Lonza arm N=36; Devens arm N=34; Day 29 (N=33 in both arms); Day 57 (Lonza arm N=31; Devens arm N=33); Day 71 (Lonza arm N=36; Devens arm N=34).

Blood pressure was obtained while the participant had been quietly seated for at least 5 minutes. Baseline was the 0 hour measurement on Day 1 (day of dosing) or if this value was missing, the last measurement before dosing. Blood pressure was measured in millimeters of mercury (mmHg) on Days 1, 2, 15, 29, 57, and 71.

All participants who received study drug (safety population) and had diastolic assessment were included in the analysis. Day 2 N=36 both arms; Day 15 (Lonza arm N=36; Devens arm N=34; Day 29 (N=33 in both arms); Day 57 (Lonza arm N=31; Devens arm N=33); Day 71 (Lonza arm N=36; Devens arm N=34).

12-lead electrocardiograms were performed on a supine participant (5 minutes supine) at baseline (baseline = screening; Days -21 to -2) and at Day 71. QT interval and QTc were measured in mille seconds (msec). A change from baseline QT and QTc (corrected for heart rate by Fridericia formula) greater than (>) 30 msec or less than (<) 60 msec were presented, as well as values over 450 and 500 msec. QT interval on ECG image defined as: time from the beginning of the QRS (complex consisting of Q, R and S waves) to the end of the T wave.

All participants who received study drug and had at least one ECG value.