Sairopa reports research milestones achieved in partnership with Exelixis, totalling $35 Million from consecutive clinical milestone payments in 2024

On December 17, 2024 Sairopa B.V., reported it has achieved a milestone event in its exclusive clinical development and option agreement with Exelixis, Inc. (Nasdaq: EXEL) involving ADU-1805, an innovative anti-SIRPα antibody with the potential to enhance the immune system’s ability to combat cancer (Press release, Sairopa, DEC 17, 2024, View Source [SID1234649153]).

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Under the terms of the agreement, Exelixis has an exclusive option to license worldwide development and commercialization rights for ADU-1805 and other anti-SIRPα antibodies following the review of data from Sairopa’s phase 1 clinical studies. As part of its collaboration with Exelixis, Sairopa has previously received from Exelixis an upfront payment of $40 million, a $35 million milestone payment upon Investigational New Drug (IND) clearance of ADU-1805 with the U.S. Food and Drug Administration, and $35 million in milestone payments linked to advances within the clinical development of ADU-1805, in monotherapy as well as in combination with a PD-1 inhibitor.

"Today’s operational update signifies a step forward in the partnered effort to develop next-generation therapies for cancer patients worldwide," said Gurvinder S. Chahal, Chief Business Officer of Sairopa. "The advances seen within our clinical program are a testament to the diligent work and innovative science behind our partnership with Exelixis, bringing us closer to realizing our mission of modulating the immune system to improve outcomes for cancer patients."

The safety and pharmacokinetics of ADU-1805 are currently being evaluated in a first-in-human, open-label, multicenter, multi-arm phase 1 study. To date, patients have been enrolled across the U.S. and several European countries, with assessments ongoing in both the ADU-1805 monotherapy and the ADU-1805 plus pembrolizumab dose escalation arms.

This collaboration combines Exelixis’ proven track record in oncology drug development and commercialization with Sairopa’s expertise in generating innovative cancer immunotherapies, setting the stage for potentially transformative treatments in oncology.