Developing next generation treatments to preserve vision for patients with diseases affecting the back of the eye

ThromboGenics Reports Day 150 Topline Data from its Phase 1/2 Clinical Study evaluating THR-317 (anti-PlGF) for the Treatment of Diabetic Macular Edema (DME)

19 Jul 2018

ThromboGenics Reports Day 150 Topline Data from its Phase 1/2 Clinical Study evaluating THR-317 (anti-PlGF) for the Treatment of Diabetic Macular Edema (DME)

Study results confirm safety and tolerability of THR-317 for intra-ocular use, and show improvement in visual acuity for up to 90 days after last injection

Leuven, Belgium - ThromboGenics NV (Euronext Brussels: THR), reports Day 150 topline results from aPhase 1/2, single-masked, multicentre study (THR-317-001) evaluating the safety and efficacy of 2 dose levels (4 mg and 8 mg) of THR-317, administered by three monthly intravitreal injections with Day 90 and Day 150 follow-up, for the treatment of diabetic macular edema (NCT03071068). 

THR-317 is a recombinant humanized monoclonal antibody directed against the receptor-binding site of human placental growth factor (PlGF).  In pre-clinical models, anti-PlGF has been shown, in addition to anti-angiogenic properties, to also be anti-inflammatory.

The THR-317-001 study enrolled a total of 49 patients and included anti-VEGF treatment naïve patients (N=40) and anti-VEGF sub-optimal responder patients (N=9). 

The study met its primary endpoint of safety for both the 4 mg and 8 mg doses. There was a low incidence of ocular adverse events, which were mostly mild and related to the injection procedure. 

Whilst the focus of the study was safety, efficacy was also observed.  Overall, patients receiving the 8mg dose of THR-317 achieved better visual acuity outcomes than in the 4mg dose group. Initial data reported for the 8mganti-VEGF treatment naïve groupat Day 90, 30 days after the last THR-317 injection, showed that 30% of patients achieved a ≥ 15 letter vision gain from baseline. 

At Day 150, 90 days after the last injection, in the 8 mg anti-VEGF treatment naïve group, 30% of these patients showed ≥ 10 letter vision gain and 10% showed a ≥15 letter vision gain, supporting durability of effect. 

In this 8mg group, average change from baseline in central subfield thickness showed a positive trend at Day 90, not observed at Day 150, which is 90 days after last injection.   

The study also showed clinical activity in the THR-317 anti-VEGF sub-optimal responder group.  Due to the small numbers in this group, no firm conclusions could be drawn.

Presentation of THR-317-001 study results is being planned for an upcoming ophthalmology meeting. 

These data provide continued support to the development of THR-317. A Phase 2 study of 8mg THR-317 in combination with anti-VEGF (ranibizumab, Lucentis®) for the treatment of DME is currently enrolling. 

Susan Schneider, MD, Chief Medical Officer of ThromboGenics nv, comments: “We are excited about the development of THR-317 for the potential treatment of diabetic macular edema. Topline results from this study show strong safety data as well as first indications of clinical activity and durability of effect.

Patrik De Haes, MD, Chief Executive Officer of ThromboGenics nv, comments: “These encouraging results provide first steps in the realization of our objective to deliver efficacious and differentiated treatments to patients with Diabetic Retinopathy by targeting novel therapeutic pathways.Different patient subpopulations will need different approaches in order to get their eye disease under control. It is our goal to serve the unmet needs of those patients.”


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