Innovent Biologics, Inc. announced that the results of two clinical studies of IBI311 (anti-IGF-1R monoclonal antibody),a Phase I trial in healthy subjects and a Phase II trial in patients with thyroid eye disease (TED), in the form of oral presentation at the 39th Asia Pacific Academy of Ophthalmology (APAO) Congress and the 21stInternational Congress of Endocrinology (ICE), respectively. A Phase I Study of IBI311 (Anti-IGF-1R Monoclonal Antibody) in Chinese Healthy Volunteers: Abstract No.: 200683: The oral presentation at the 39th APAO annual meeting was based on a single dose escalation Phase 1 clinical study (NCT05480597) to evaluate the safety and tolerability of a single intravenous infusion of IBI311 in Chinese healthy volunteers. The primary endpoint of the study was safety variables, and secondary endpoints included pharmacokinetic (PK) parameters and immunogenicity results.

The results showed that IBI311 was safe and well tolerated, with the most common treatment-emergent AEs being Grade 1 or 2, transient, and most resolving without treatment. All IBI311 dose groups were tested negative for anti-drug antibodies during the study. These indicated that a single intravenous administration of IBI311 at various dose levels in healthy subjects is safe and well tolerated, and the PK profile supports dose selection for subsequent clinical development.

A Phase II Study of IBI311 for the Treatment of Thyroid Eye Disease: Abstract No.: # 792: The oral presentation at the 21stInternational Congress of Endocrinology was based on a multicenter, randomized, double-masked, placebo-controlled Phase II study (NCT05795621) to evaluate the efficacy and safety of IBI311 in subjects with moderately to severely active TED. A total of 33 eligible subjects were randomized in a 2: 1 ratio to receive either IBI311 or placebo. The primary endpoint was the proptosis response rate at Week 12 of the study eye (defined as the percentage of subjects with a reduction in proptosis of =2 mm from baseline in the study eye without deterioration = 2 mm increase of proptosis in the fellow eye).

After 12 weeks, all subjects received IBI311 until Week 21. The results of the study showed: The primary endpoint was achieved: at Week 12, the proptosis responder rate in the study eye was significantly higher in the IBI311 group than in the placebo group (59.1% vs 18.2%, OR=11. 55, P=0. 0309).

With continued treatment and follow-up to week 24, the IBI311 treatment group achieved up to 72.7% proptosis responder rate, 3.37 mm reduction in proptosis from baseline, 88.2% diplopia responder rate (defined as diplopia improvement = grade 1). Safety: The overall safety profile of IBI311 was favorable, with the majority of AE being mild or moderate in severity, and no treatment-emergent AE leading to drug discontinuation/interruption in the IBI311 group. These results suggested that IBI311 significantly improves the proptosis in patients with TED in 12 weeks of treatment, and can lead to clinical benefits such as further improvement of proptosis and improvement of diplopia after continuation of treatment, with a favorable safety profile.