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NCT03525678 · OUTCOME

Number of Participants With at Least One Confirmed Positive Post-Baseline Anti-drug Antibody (ADA) Result

A Study to Investigate the Efficacy and Safety of Two Doses of GSK2857916 in Participants With Multiple Myeloma Who Have Failed Prior Treatment With an Anti-CD38 Antibody · Source last updated 2025-09-03

Results reported by the registry submitting party. Population, time horizon, units and missing values must be read together.

Measure
COUNT_OF_PARTICIPANTS
Unit
Participants
Interval / dispersion
Not reported
Time frame
Up to 186 weeks

What was measured

Serum samples were collected for the determination of anti-GSK2857916 antibodies (ADA) using a validated electrochemiluminescent (ECL) immunoassay. The assay involved screening, confirmation and titration steps. If serum samples tested positive in the screening assay, they were considered 'potentially positive' and were further analyzed for the specificity using the confirmation assay. Samples that confirmed positive in the confirmation assay were reported as 'positive'. Confirmed positive ADA samples were further characterized in the titration assay to quasi-quantitate the amount of ADA in the sample. Additionally, confirmed positive ADA samples were also tested in a validated neutralizing antibody assay to determine the potential neutralizing activity of the ADA.

Analysis population: Full Safety Population. 3 participants out of 221 participants did not receive any study treatment and thus, were excluded from the Full Safety Population. Only those participants with data available at the specified data points were analyzed.

Groups in this outcome

Main Study: GSK2857916 2.5 mg/kg (Frozen Liquid)

Participants were administered frozen liquid (30 mg/vial solution in a single use vial) at a dose of 2.5 mg/kg GSK2857916 as IV solution once every three weeks for a maximum of up to 39 cycles (1 cycle= 21 days). Frozen liquid was diluted with 0.9 percent saline.

Main Study: GSK2857916 3.4 mg/kg (Frozen Liquid)

Participants were administered frozen liquid (30 mg/vial solution in a single use vial) at a dose of 3.4 mg/kg GSK2857916 as IV solution once every three weeks for a maximum of up to 32 cycles (1 cycle= 21 days). Frozen liquid was diluted with 0.9 percent saline.

Main Study: GSK2857916 3.4 mg/kg (Lyophilized)

Participants were administered lyophilized powder (100 mg/vial in a single use vial) at a dose of 3.4 mg/kg GSK2857916 given IV for a maximum of 35 cycles (1 cycle= 21 days). Lyophilized powder was reconstituted using water for injection.

Group identifiers and denominators belong to this outcome only. They may differ in another outcome or in safety reporting.

Analysis denominator · Participants

GroupSource count
Main Study: GSK2857916 2.5 mg/kg (Frozen Liquid)89
Main Study: GSK2857916 3.4 mg/kg (Frozen Liquid)92
Main Study: GSK2857916 3.4 mg/kg (Lyophilized)24

Reported measurements

Source class 1
Values in Participants · Interval/dispersion: Not reported
GroupValueSpreadLowerUpperComment
Main Study: GSK2857916 2.5 mg/kg (Frozen Liquid)2Not reportedNot reportedNot reportedNot reported
Main Study: GSK2857916 3.4 mg/kg (Frozen Liquid)0Not reportedNot reportedNot reportedNot reported
Main Study: GSK2857916 3.4 mg/kg (Lyophilized)0Not reportedNot reportedNot reportedNot reported
Complete source fields
classes
  1. categories
    1. measurements
      1. group Id
        OG000
        value
        2
      2. group Id
        OG001
        value
        0
      3. group Id
        OG002
        value
        0
denoms
  1. counts
    1. group Id
      OG000
      value
      89
    2. group Id
      OG001
      value
      92
    3. group Id
      OG002
      value
      24
    units
    Participants
description
Serum samples were collected for the determination of anti-GSK2857916 antibodies (ADA) using a validated electrochemiluminescent (ECL) immunoassay. The assay involved screening, confirmation and titration steps. If serum samples tested positive in the screening assay, they were considered 'potentially positive' and were further analyzed for the specificity using the confirmation assay. Samples that confirmed positive in the confirmation assay were reported as 'positive'. Confirmed positive ADA samples were further characterized in the titration assay to quasi-quantitate the amount of ADA in the sample. Additionally, confirmed positive ADA samples were also tested in a validated neutralizing antibody assay to determine the potential neutralizing activity of the ADA.
groups
  1. description
    Participants were administered frozen liquid (30 mg/vial solution in a single use vial) at a dose of 2.5 mg/kg GSK2857916 as IV solution once every three weeks for a maximum of up to 39 cycles (1 cycle= 21 days). Frozen liquid was diluted with 0.9 percent saline.
    id
    OG000
    title
    Main Study: GSK2857916 2.5 mg/kg (Frozen Liquid)
  2. description
    Participants were administered frozen liquid (30 mg/vial solution in a single use vial) at a dose of 3.4 mg/kg GSK2857916 as IV solution once every three weeks for a maximum of up to 32 cycles (1 cycle= 21 days). Frozen liquid was diluted with 0.9 percent saline.
    id
    OG001
    title
    Main Study: GSK2857916 3.4 mg/kg (Frozen Liquid)
  3. description
    Participants were administered lyophilized powder (100 mg/vial in a single use vial) at a dose of 3.4 mg/kg GSK2857916 given IV for a maximum of 35 cycles (1 cycle= 21 days). Lyophilized powder was reconstituted using water for injection.
    id
    OG002
    title
    Main Study: GSK2857916 3.4 mg/kg (Lyophilized)
param Type
COUNT_OF_PARTICIPANTS
population Description
Full Safety Population. 3 participants out of 221 participants did not receive any study treatment and thus, were excluded from the Full Safety Population. Only those participants with data available at the specified data points were analyzed.
reporting Status
POSTED
time Frame
Up to 186 weeks
title
Number of Participants With at Least One Confirmed Positive Post-Baseline Anti-drug Antibody (ADA) Result
type
SECONDARY
unit Of Measure
Participants

Download exact source JSON → · Snapshot ctgov-results-25a395029948b04d52b1253f

Preserved source evidence · Not medical advice