DX71
Phase 2 Multicenter Study Results of Ublituximab, a Novel Glycoengineered Anti-CD20 Monoclonal Antibody (mAb), in Patients with Relapsing Forms of Multiple Sclerosis (RMS)

Friday, June 1, 2018: 3:42 PM
209 (Nashville Music City Center)
Edward J. Fox, MD, PhD , Central Texas Neurology Consultants, Round Rock, TX
Amy Lovett-Racke, PhD , Microbial Infection and Immunity, Ohio State University Medical Center, Columbus, OH
Matilde Inglese, MD, PhD , Department of Neurology, Radiology and Neuroscience, Mount Sinai School of Medicine, New York, NY
Maria Petracca, MD, PhD , Neurology, Icahn School of Medicine at Mount Sinai, New York, NY
Sibyl Wray, MD , Hope Neurology MS Center, Knoxville, TN
Michael K Racke, MD , Wexner Medical Center, Ohio State University, Columbus, OH
Richard Shubin, MD , SC3 Research Group, Inc, Pasadena, CA
Cary L Twyman, MD , Associates in Neurology PSC, Lexington, KY, USA, Lexington, KY
Michael Weiss, JD , Autoimmune, TG Therapeutics, Inc, New York, NY
James Eubanks, PhD , Autoimmune, TG Therapeutics, Inc, New York, NY
Koby Mok, PhD , Autoimmune, TG Therapeutics, Inc, New York, NY
Wendy Su, PhD , Autoimmune, TG Therapeutics, Inc, New York, NY


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Background: Ublituximab is a novel mAb targeting a unique epitope on the CD20 antigen glycoengineered to enhance affinity for all variants of FcγRIIIa receptors, demonstrating greater antibody-dependent cellular cytotoxicity (ADCC) activity than rituximab.  The enhanced ADCC potency of ublituximab may offer benefits over currently available anti-CD20s in terms of lower doses and shorter infusion times.

Objectives: To assess the B-cell depletion, safety, clinical and radiological efficacy and changes in the immune cell dynamics of ublituximab in RMS subjects.

Methods: TG1101-RMS201 is a 52-week, Phase 2, placebo-controlled, multicenter study designed to assess the optimal dose and infusion time of ublituximab in RMS subjects.  All subjects, including placebo subjects (post-placebo phase), receive 3 ublituximab infusions at Day 1, Day 15, and Week 24.

Results: All subjects (24/24) exceeded the target level of 95% B-cell depletion within 4 weeks of ublituximab treatment. Additional detailed immunological analyses showed novel, transient modulatory effects on T-cell populations.  To date, 11 of 24 subjects have completed all assessments in the 52-week trial.  87% remain relapse-free at 52 weeks (from a baseline mean of 1.42±1.1 relapses) and 81% are confirmed to be disability progression free.  There was a 100% reduction of T1-Gd enhancing lesions at 52 weeks (baseline = 2.4 lesions (mean); p=0.004).    The most common adverse event (AE) was IRRs (all grade 1 or 2, in 17% of subjects).  No severe AEs were associated with ublituximab treatment.  No correlation between faster infusion time (as low as 1 hour) and increased IRR frequency was observed.

Conclusions: The Phase 2 results suggest that ublituximab, with infusion times as low as one hour, is safe and well tolerated, with favorable clinical and MRI outcomes at 1 year.  We will be reporting the data set for all subjects at the date of presentation.