| Primary | Number of Participants With Treatment-Emergent Adverse Events (TEAEs) | An adverse event (AE) is any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of study drug, whether or not considered related to the study drug. A TEAE were the events between administration of study drug (Day 1) and Day 169 that were absent before treatment or that worsened relative to pre-treatment state. The AEs were summarized using Medical Dictionary for Regulatory Activities version 19.0 | Safety Population is defined as all participants who received any amount of study drug. | Posted | | Count of Participants | | Participants | | From study drug administration (Day 1) through the end of treatment period (Day 169) | | | | ID | Title | Description |
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| OG000 | PLACEBO-IV-SC | Participants received either a fixed IV dose of placebo matching MEDI-551 on Days 1 and 15 or SC injection on Day 1. | | OG001 | MEDI-551 30 Mg-IV | Participants received a fixed IV dose of 30 milligram (mg) MEDI-551 infused on Days 1 and 15. | | OG002 | MEDI-551 60 Mg-SC | Participants received SC injection of 60 mg MEDI-551 on Day 1. | | OG003 | MEDI-551 100 Mg-IV | Participants received a fixed IV dose of 100 mg MEDI-551 infused on Days 1 and 15. | | OG004 | MEDI-551 300 Mg-SC | Participants received SC injection of 300 mg MEDI-551 on Day 1. | | OG005 | MEDI-551 600 Mg-IV | Participants received a fixed IV dose of 600 mg MEDI-551 infused on Days 1 and 15. |
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| Primary | Number of Participants With Treatment-emergent Serious Adverse Events (TESAEs) | A serious adverse event (SAE) is an AE resulting in any of the following outcomes or deemed significant for any other reason: death, life-threatening, initial or prolonged inpatient hospitalization, persistent or significant disability or incapacity, congenital anomaly or birth defect in the offspring of a participant who received the study drug. The TESAEs were the events between administration of study drug (Day 1) and long term follow up period (up to 18 months after early discontinuation visit or 24-week treatment period) that were absent before treatment or that worsened relative to pre-treatment state. The AEs were summarized using Medical Dictionary for Regulatory Activities version 19.0 | | Posted | | Count of Participants | | Participants | | From study drug administration (Day 1) through the long term follow up period (up to 18 months after early discontinuation visit or 24 week treatment period). | | | | ID | Title | Description |
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| OG000 | PLACEBO-IV-SC | Participants received either a fixed IV dose of placebo matching MEDI-551 on Days 1 and 15 or SC injection on Day 1. | | OG001 | MEDI-551 30 Mg-IV | Participants received a fixed IV dose of 30 milligram (mg) MEDI-551 infused on Days 1 and 15. | | OG002 | MEDI-551 60 Mg-SC |
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| Primary | Number of Participants With Clinical Laboratory Abnormalities Reported as TEAEs | Any clinically significant change in laboratory evaluations were recorded as AEs. The following parameters were analyzed for laboratory evaluations: haematology, serum chemistry, and urinalysis. Number of participants with TEAEs related to laboratory evaluations were reported. | | Posted | | Count of Participants | | Participants | | From study drug administration (Day 1) through the end of treatment period (Day 169) | | | | ID | Title | Description |
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| OG000 | PLACEBO-IV-SC | Participants received either a fixed IV dose of placebo matching MEDI-551 on Days 1 and 15 or SC injection on Day 1. | | OG001 | MEDI-551 30 Mg-IV | Participants received a fixed IV dose of 30 milligram (mg) MEDI-551 infused on Days 1 and 15. | | OG002 | MEDI-551 60 Mg-SC | Participants received SC injection of 60 mg MEDI-551 on Day 1. | | OG003 | MEDI-551 100 Mg-IV | Participants received a fixed IV dose of 100 mg MEDI-551 infused on Days 1 and 15. |
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| Primary | Number of Participants With Vital Sign Abnormalities Reported as TEAEs | Vital sign parameters included blood pressure, temperature, pulse rate, and respiratory rate. The number of participants with TEAEs related to vital signs in participants were reported. | | Posted | | Count of Participants | | Participants | | From study drug administration (Day 1) through the end of treatment period (Day 169) | | | | ID | Title | Description |
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| OG000 | PLACEBO-IV-SC | Participants received either a fixed IV dose of placebo matching MEDI-551 on Days 1 and 15 or SC injection on Day 1. | | OG001 | MEDI-551 30 Mg-IV | Participants received a fixed IV dose of 30 milligram (mg) MEDI-551 infused on Days 1 and 15. | | OG002 | MEDI-551 60 Mg-SC | Participants received SC injection of 60 mg MEDI-551 on Day 1. | | OG003 | MEDI-551 100 Mg-IV | Participants received a fixed IV dose of 100 mg MEDI-551 infused on Days 1 and 15. |
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| Secondary | Time to Reach Maximum Observed Serum Concentration (Tmax) of MEDI-551 | The time to reach the maximum observed serum concentration of MEDI-551. | | Posted | | Median | Full Range | Day | | Predose (Day 1) and Postdose (IV Cohorts only), Days 4 (SC Cohorts only), 8, 15 Predose and Postdose (IV Cohorts only), 29, 57, 85, 113, 141, and 169 | | | | ID | Title | Description |
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| OG000 | MEDI-551 30 Mg-IV | Participants received a fixed IV dose of 30 milligram (mg) MEDI-551 infused on Days 1 and 15. | | OG001 | MEDI-551 60 Mg-SC | Participants received SC injection of 60 mg MEDI-551 on Day 1. | | OG002 | MEDI-551 100 Mg-IV | Participants received a fixed IV dose of 100 mg MEDI-551 infused on Days 1 and 15. | | OG003 | MEDI-551 300 Mg-SC | Participants received SC injection of 300 mg MEDI-551 on Day 1. | | OG004 | MEDI-551 600 Mg-IV |
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| Secondary | Maximum Observed Serum Concentration (Cmax) of MEDI-551 | The maximum observed serum concentration (Cmax) of MEDI-551. | | Posted | | Mean | Standard Deviation | microgram per milliliter (mcg/mL) | | Predose (Day 1) and Postdose (IV Cohorts only), Days 4 (SC Cohorts only), 8, 15 Predose and Postdose (IV Cohorts only), 29, 57, 85, 113, 141, and 169 | | | | ID | Title | Description |
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| OG000 | MEDI-551 30 Mg-IV | Participants received a fixed IV dose of 30 milligram (mg) MEDI-551 infused on Days 1 and 15. | | OG001 | MEDI-551 60 Mg-SC | Participants received SC injection of 60 mg MEDI-551 on Day 1. | | OG002 | MEDI-551 100 Mg-IV | Participants received a fixed IV dose of 100 mg MEDI-551 infused on Days 1 and 15. | | OG003 | MEDI-551 300 Mg-SC | Participants received SC injection of 300 mg MEDI-551 on Day 1. | | OG004 |
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| Secondary | Area Under the Plasma Concentration-time Curve From Time 0 to the Time of the Last Quantifiable Concentration (AUC 0-last) of MEDI-551 | The area under the concentration time curve from time 0 (dosing time) to the last measurable concentration (AUC 0-last) of MEDI-551. | | Posted | | Mean | Standard Deviation | microgram*day per milliliter(mcg*day/mL) | | Predose (Day 1) and Postdose (IV Cohorts only), Days 4 (SC Cohorts only), 8, 15 Predose and Postdose (IV Cohorts only), 29, 57, 85, 113, 141, and 169 | | | | ID | Title | Description |
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| OG000 | MEDI-551 30 Mg-IV | Participants received a fixed IV dose of 30 milligram (mg) MEDI-551 infused on Days 1 and 15. | | OG001 | MEDI-551 60 Mg-SC | Participants received SC injection of 60 mg MEDI-551 on Day 1. | | OG002 | MEDI-551 100 Mg-IV | Participants received a fixed IV dose of 100 mg MEDI-551 infused on Days 1 and 15. | | OG003 | MEDI-551 300 Mg-SC | Participants received SC injection of 300 mg MEDI-551 on Day 1. |
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| Secondary | Area Under the Plasma Concentration-time Curve From Zero to Infinity (AUC 0-infinity) of MEDI-551 | The area under the concentration-time curve from dosing extrapolated to infinity (AUC 0-infinity) of MEDI-551. | | Posted | | Mean | Standard Deviation | mcg*day/mL | | Predose (Day 1) and Postdose (IV Cohorts only), Days 4 (SC Cohorts only), 8, 15 Predose and Postdose (IV Cohorts only), 29, 57, 85, 113, 141, and 169 | | | | ID | Title | Description |
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| OG000 | MEDI-551 30 Mg-IV | Participants received a fixed IV dose of 30 milligram (mg) MEDI-551 infused on Days 1 and 15. | | OG001 | MEDI-551 60 Mg-SC | Participants received SC injection of 60 mg MEDI-551 on Day 1. | | OG002 | MEDI-551 100 Mg-IV | Participants received a fixed IV dose of 100 mg MEDI-551 infused on Days 1 and 15. | | OG003 | MEDI-551 300 Mg-SC | Participants received SC injection of 300 mg MEDI-551 on Day 1. | |
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| Secondary | Dose Normalized Area Under the Plasma Concentration-time Curve From Zero to Infinity (AUC 0-infinity/D) of MEDI-551 | The AUC (0-infinity)/D is the area under concentration-time curve extrapolated to infinity post dose normalized by MEDI-551. | | Posted | | Mean | Standard Deviation | mcg*day/mL/mg | | Predose (Day 1) and Postdose (IV Cohorts only), Days 4 (SC Cohorts only), 8, 15 Predose and Postdose (IV Cohorts only), 29, 57, 85, 113, 141, and 169 | | | | ID | Title | Description |
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| OG000 | MEDI-551 30 Mg-IV | Participants received a fixed IV dose of 30 milligram (mg) MEDI-551 infused on Days 1 and 15. | | OG001 | MEDI-551 60 Mg-SC | Participants received SC injection of 60 mg MEDI-551 on Day 1. | | OG002 | MEDI-551 100 Mg-IV | Participants received a fixed IV dose of 100 mg MEDI-551 infused on Days 1 and 15. | | OG003 | MEDI-551 300 Mg-SC | Participants received SC injection of 300 mg MEDI-551 on Day 1. |
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| Secondary | Clearance of MEDI-551 | Systemic clearance (CL) for MEDI-551 IV cohorts and apparent clearance (CL/F) for MEDI-551 SC cohorts were calculated | | Posted | | Mean | Standard Deviation | mL/day | | Predose (Day 1) and Postdose (IV Cohorts only), Days 4 (SC Cohorts only), 8, 15 Predose and Postdose (IV Cohorts only), 29, 57, 85, 113, 141, and 169 | | | | ID | Title | Description |
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| OG000 | MEDI-551 30 Mg-IV | Participants received a fixed IV dose of 30 milligram (mg) MEDI-551 infused on Days 1 and 15. | | OG001 | MEDI-551 60 Mg-SC | Participants received SC injection of 60 mg MEDI-551 on Day 1. | | OG002 | MEDI-551 100 Mg-IV | Participants received a fixed IV dose of 100 mg MEDI-551 infused on Days 1 and 15. | | OG003 | MEDI-551 300 Mg-SC | Participants received SC injection of 300 mg MEDI-551 on Day 1. | | OG004 |
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| Secondary | Terminal Elimination Half-life (t1/2) of MEDI-551 | The terminal elimination half-life (t1/2) was estimated based on the plasma concentrations of MEDI-551. | | Posted | | Mean | Standard Deviation | Day | | Predose (Day 1) and Postdose (IV Cohorts only), Days 4 (SC Cohorts only), 8, 15 Predose and Postdose (IV Cohorts only), 29, 57, 85, 113, 141, and 169 | | | | ID | Title | Description |
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| OG000 | MEDI-551 30 Mg-IV | Participants received a fixed IV dose of 30 milligram (mg) MEDI-551 infused on Days 1 and 15. | | OG001 | MEDI-551 60 Mg-SC | Participants received SC injection of 60 mg MEDI-551 on Day 1. | | OG002 | MEDI-551 100 Mg-IV | Participants received a fixed IV dose of 100 mg MEDI-551 infused on Days 1 and 15. | | OG003 | MEDI-551 300 Mg-SC | Participants received SC injection of 300 mg MEDI-551 on Day 1. | | OG004 |
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| Secondary | Absolute Subcutaneous Bioavailability (F%) of MEDI-551 | Bioavailability (F%) is the fraction of the study drug absorbed through non-intravenous administration compared with the corresponding intravenous administration of the same drug. | | Posted | | Number | | Percentage of bioavailability | | Predose (Day 1) and Days 4, 8, 15, 29, 57, 85, 113, 141, and 169 | | | | ID | Title | Description |
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| OG000 | MEDI-551 60 Mg-SC | Participants received SC injection of 60 mg MEDI-551 on Day 1. | | OG001 | MEDI-551 300 Mg-SC | Participants received SC injection of 300 mg MEDI-551 on Day 1. |
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| Secondary | Absolute CD20 B-cell Count at Baseline | Baseline absolute CD20 count is measured as the average between screening and predose on Day 1. | | Posted | | Mean | Standard Deviation | cells/mcL | | Baseline (Days -28 to -1) | | | | ID | Title | Description |
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| OG000 | PLACEBO-IV-SC | Participants received either a fixed IV dose of placebo matching MEDI-551 on Days 1 and 15 or SC injection on Day 1. | | OG001 | MEDI-551 30 Mg-IV | Participants received a fixed IV dose of 30 milligram (mg) MEDI-551 infused on Days 1 and 15. | | OG002 | MEDI-551 60 Mg-SC | Participants received SC injection of 60 mg MEDI-551 on Day 1. | | OG003 | MEDI-551 100 Mg-IV | Participants received a fixed IV dose of 100 mg MEDI-551 infused on Days 1 and 15. | | OG004 | MEDI-551 300 Mg-SC | |
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| Secondary | Time to 90 Percent (%) CD20 B-cell Depletion | Time in days of first observation where CD20 counts fall to or below 10 percent (%) of baseline. | Safety Population. No participants in placebo-IV-SC group reached 90% CD20 B-cell depletion. | Posted | | Median | Full Range | Day | | Baseline (Days -28 to -1) to long-term follow-up (LTFU) (Up to 18 months after EDV or 24 Week treatment period) | | | | ID | Title | Description |
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| OG000 | PLACEBO-IV-SC | Participants received either a fixed IV dose of placebo matching MEDI-551 on Days 1 and 15 or SC injection on Day 1. | | OG001 | MEDI-551 30 Mg-IV | Participants received a fixed IV dose of 30 milligram (mg) MEDI-551 infused on Days 1 and 15. | | OG002 | MEDI-551 60 Mg-SC | Participants received SC injection of 60 mg MEDI-551 on Day 1. | | OG003 | MEDI-551 100 Mg-IV | Participants received a fixed IV dose of 100 mg MEDI-551 infused on Days 1 and 15. | |
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| Secondary | Duration of Suppression Greater Than or Equal to 90 % of CD20 B-cell Count | Time in days of last observation where CD20 counts remain at or below 10% of baseline. Participants whose samples are available were analyzed for this outcome measure. | Safety Population. No participants were included in placebo-IV-SC group since no participant reached 90% depletion. | Posted | | Median | Full Range | Day | | Baseline (Days -28 to -1) to LTFU (Up to 18 months after EDV or 24 Week treatment period) | | | | ID | Title | Description |
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| OG000 | PLACEBO-IV-SC | Participants received either a fixed IV dose of placebo matching MEDI-551 on Days 1 and 15 or SC injection on Day 1. | | OG001 | MEDI-551 30 Mg-IV | Participants received a fixed IV dose of 30 milligram (mg) MEDI-551 infused on Days 1 and 15. | | OG002 | MEDI-551 60 Mg-SC | Participants received SC injection of 60 mg MEDI-551 on Day 1. | | OG003 | MEDI-551 100 Mg-IV | Participants received a fixed IV dose of 100 mg MEDI-551 infused on Days 1 and 15. |
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| Secondary | Maximum Change From Baseline in Absolute CD20 of Peripheral Blood B-cell Count to LTFU | The maximum degree of depletion (intensity) measured during the course of the study for each participant by subtracting 100 from the lowest observed percent of baseline value. | | Posted | | Mean | Standard Deviation | Percentage of cells | | Baseline (Days -28 to -1) to LTFU (Up to 18 months after EDV or 24 Week treatment period) | | | | ID | Title | Description |
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| OG000 | PLACEBO-IV-SC | Participants received either a fixed IV dose of placebo matching MEDI-551 on Days 1 and 15 or SC injection on Day 1. | | OG001 | MEDI-551 30 Mg-IV | Participants received a fixed IV dose of 30 milligram (mg) MEDI-551 infused on Days 1 and 15. | | OG002 | MEDI-551 60 Mg-SC | Participants received SC injection of 60 mg MEDI-551 on Day 1. | | OG003 | MEDI-551 100 Mg-IV | Participants received a fixed IV dose of 100 mg MEDI-551 infused on Days 1 and 15. |
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| Secondary | Number of Participants Positive for Anti-Drug Antibodies to MEDI-551 | A participant was considered anti-drug antibody positive across the study if they had a positive reading at any time point during the study. | | Posted | | Count of Participants | | Participants | | Days 1, 29, 85 and 169 | | | | ID | Title | Description |
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| OG000 | PLACEBO-IV-SC | Participants received either a fixed IV dose of placebo matching MEDI-551 on Days 1 and 15 or SC injection on Day 1. | | OG001 | MEDI-551 30 Mg-IV | Participants received a fixed IV dose of 30 milligram (mg) MEDI-551 infused on Days 1 and 15. | | OG002 | MEDI-551 60 Mg-SC | Participants received SC injection of 60 mg MEDI-551 on Day 1. | | OG003 | MEDI-551 100 Mg-IV | Participants received a fixed IV dose of 100 mg MEDI-551 infused on Days 1 and 15. | | OG004 |
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