19 January 2022 - - US-based Omeros Corp. (NASDAQ: OMER) has confirmed that earlier this month the company submitted to the US Food and Drug Administration its response to the Agency's Complete Response Letter for narsoplimab in the treatment of hematopoietic stem cell transplant-associated thrombotic microangiopathy (HSCT-TMA).

The response comprises a comprehensive briefing package drafted in close collaboration with external clinical, regulatory and legal experts that addresses in detail the points raised by FDA in its CRL for narsoplimab.

Omeros concurrently requested a Type A meeting with FDA to resolve any outstanding items.

Narsoplimab is the first drug candidate submitted to FDA for approval in HSCT-TMA. It has Breakthrough Therapy and Orphan designations in both HSCT-TMA and IgA nephropathy.

Omeros is an innovative biopharmaceutical company committed to discovering, developing and commercializing small-molecule and protein therapeutics for large-market and orphan indications targeting inflammation, immunologic diseases (e.g., complement-mediated diseases) and cancers.

Omeros' lead MASP-2 inhibitor narsoplimab targets the lectin pathway of complement and is the subject of a biologics license application pending before FDA for the treatment of hematopoietic stem cell transplant-associated thrombotic microangiopathy.

Narsoplimab is also in multiple late-stage clinical development programs focused on other complement-mediated disorders, including IgA nephropathy, atypical hemolytic uremic syndrome and COVID-19.

OMS906, Omeros' inhibitor of MASP-3, the key activator of the alternative pathway of complement, is in a Phase 1 clinical trial.