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Zenas BioPharma Announces the Presentation of New Obexelimab Data in IgG4-Related Disease at the 6th International Symposium on IgG4-Related Disease

$ZBIOPress releaseOct 12, 2026, 7:00 AM ETRead the release

Zenas BioPharma presented new Phase 3 INDIGO data on obexelimab in IgG4-related disease at the 6th International Symposium on IgG4-Related Disease. Open-label extension data showed a 12-month flare-free probability of 0.93 (adjudicated), and a sub-analysis found obexelimab significantly reduced cumulative glucocorticoid toxicity versus placebo at week 52 (GTI difference -11.4; p=0.021). A vaccine sub-study found 86% influenza and 100% COVID-19 seroimmunity following vaccination during a treatment-free window, with no disease flares observed.

Key figures

Drug Name
obexelimab
Phase Of Trial
Phase 3
Gti p value
0.021
Covid19 seroimmunity
4 of 4 (100%)
Influenza seroimmunity
6 of 7 (86%)
Flare free probability 12mo adjudicated
0.93
Flare free probability 12mo investigator
0.87
Gti cumulative worsening score difference
-11.4

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