Silence Therapeutics Gets Milestone Payment from Mallinckrodt Collaboration

Silence Therapeutics a company involved in the discovery, development and delivery of novel short interfering ribonucleic acid (siRNA) therapeutics for the treatment of diseases with significant unmet medical need, announced that it has achieved another research milestone as part of its ongoing RNAi collaboration with Mallinckrodt plc for complement-mediated diseases, triggering a further $2.0 million payment to Silence.

The milestone relates to pre-clinical development work on the SLN500 C3 targeting program, highlighting the successful ongoing collaboration between the two companies. Silence continues to work with Mallinckrodt to progress Investigational New Drug (IND) enabling studies for SLN501, the first nominated product candidate in the SLN500 program, this year.

The collaboration with Mallinckrodt is focused on the development and commercialization of RNAi therapeutics designed to inhibit or ‘silence’ the complement cascade, a group of proteins involved in the immune system and which play a role in the development of inflammation. Using Silence’s proprietary mRNAi GOLD™ platform, siRNAs engineered to inhibit each target in the collaboration will be optimized and investigated before progressing into clinical development.

In July 2019, Silence received an upfront payment of $20 million from Mallinckrodt for an exclusive worldwide license to siRNAs against one complement target, C3, and options to license siRNAs against up to two additional targets, each of which Mallinckrodt has exercised at $2 million per target. Under the terms of the agreement, Silence is responsible for preclinical activities and for executing development of each target through Phase 1, after which Mallinckrodt will assume responsibility for clinical development and global commercialization. Silence is also eligible to receive tiered double-digit royalties on net sales for each product candidate and up to $2 billion in total milestone payments across all three targets.