Santen Announces Topline Data for DE-128 (MicroShunt) Demonstrating Reductions in IOP and Medication Use in Patients With Glaucoma

Source: Santen

Santen Pharmaceutical announced the results of INN-005, a prospective, randomized, controlled, single-masked, multicenter study to assess the safety and effectiveness of DE-128 (MicroShunt) standalone, without concomitant cataract extraction. The study compared DE-128 implanted intraoperatively with 0.2 mg/ml concentration of mitomycin C (MMC) against standard of care trabeculectomy with the same concentration of MMC, a well-established surgical approach for patients with primary open-angle glaucoma (POAG) in which IOP is not controlled when using maximum tolerated glaucoma medications.

“We are delighted to have completed this first US premarket approval (PMA), head-to-head study of MicroShunt against trabeculectomy in glaucoma subjects who could benefit from a surgical device that uses a standardized, effective, standalone and less cumbersome surgical procedure to produce predictable outcomes,” Naveed Shams, MD, PhD, Head of Santen’s Global R&D, said in a company news release. “Santen will work with the U.S. Food and Drug Administration (FDA) and other regulatory agencies around the world to bring the DE-128, MicroShunt to patients.”

Topline Results:

  • DE-128 demonstrated effective IOP reduction: Mean (± SD) diurnal IOP at month 12 in the DE128 arm dropped from medicated 21.1 ± 4.9 mmHg to 14.2 ± 4.4 mmHg compared with a drop from 21.1 ± 5.0 mmHg to 11.2 ± 4.2 mmHg in the trabeculectomy arm.
  • DE-128 demonstrated medication reduction: Mean number of glaucoma medications used per patient was reduced in both groups, from an average of 3.0 medications at screening to 0.6 in the DE-128 group and 0.3 in the trabeculectomy arm at month 12. In the DE-128 arm, 71.6% subjects were medication-free at month 12, compared with 84.8% in the trabeculectomy arm.
  • Suture lysis was required to decrease IOP in the trabeculectomy arm and not in the DE-128 arm (52.3% vs. 0% respectively), and the rate of hypotony at any time was 51.1% vs. 30.6% respectively.
  • The most common adverse event reported in subjects in both groups was increased IOP requiring additional treatment (trabeculectomy: 55.7% vs. DE-128: 52.7%). Endothelial cell loss from screening to month 12 was similar in both groups (trabeculectomy: -6.9% vs. DE-128: – 5.2%).

“The MicroShunt, designated DE-128 in the study, is a drainage device designed to reduce the rate of complications, such as hypotony, bleb leaks and cataract, while still providing IOP lowering to protect against further visual field loss. In the study, both groups received mitomycin C 0.2 mg/ml for 2 minutes on label with Mitosol*, a lower dose than that used in the published pilot study (0.4 mg/ml for 3 minutes) of the MicroShunt. The majority of the subjects treated with the MicroShunt experienced a greater than or equal to 20% decline in IOP at month 12, to an average of 14 mmHg,” Paul Palmberg, MD, PhD, of the Bascom Palmer Eye Institute, Miami, Florida, who serves as the Medical Monitor, said in the news release.

“Although, the IOP-lowering effect of trabeculectomy (11 mmHg) was statistically superior than that of the MicroShunt, the trabeculectomy arm had a greater incidence of hypotony, bleb leaks and lens opacity, complications typically associated with trabeculectomy. If approved by regulators, the MicroShunt would be an effective and safe option for patients with mild, moderate or severe glaucoma requiring surgery. This will allow the glaucoma surgeon to identify the subset of patients for whom the risk benefit profile of the MicroShunt offers benefit,” Dr. Palmberg said.


Based on the strength of this data, Santen intends to complete a Modular PMA submission to the FDA as soon as possible. DE-128 is already available in Europe under the trademark PRESERFLO™ MicroShunt. *Mitosol® is a registered trademark of Mobius Therapeutics™, LLC.

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