On March 25, 2021 Pieris Pharmaceuticals, Inc. (NASDAQ:PIRS), a clinical-stage biotechnology company advancing novel biotherapeutics through its proprietary Anticalin technology platform for respiratory diseases, cancer, and other indications, reported that Seagen has made a strategic equity investment in Pieris as part of an ongoing collaboration between the companies (Press release, Pieris Pharmaceuticals, MAR 25, 2021, https://ir.pieris.com/news/detail/655/pieris-announces-amendment-of-existing-immuno-oncology-multi-target-collaboration-with-seagen-a-clinical-trial-and-supply-agreement-to-evaluate-cinrebafusp-alfa-prs-343-in-combination-with-tukysa-tucatinib-in-gastric-cancer-and-strategic-equity-investment-by-seagen [SID1234577151]). In addition, the companies have entered into a clinical trial collaboration agreement to evaluate the safety and efficacy of combining Pieris’ cinrebafusp alfa (PRS-343), a 4-1BB/HER2 bispecific, with Seagen’s TUKYSA (tucatinib), a small-molecule tyrosine kinase HER2 inhibitor, for the treatment of gastric cancer patients expressing lower HER2 levels (IHC2+/ISH- & IHC1+) as part of the upcoming phase 2 study to be conducted by Pieris. The companies have also amended their existing immuno-oncology collaboration agreement around joint development and commercial rights for the second of up to three products in the alliance.
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The combination of cinrebafusp alfa and TUKYSA could potentially address a high medical need in HER2 low-expressing gastric cancer patients who do not respond to traditional HER2-targeted therapies. Preclinical studies show that TUKYSA synergizes with cinrebafusp alfa to enhance its 4-1BB-mediated immune cell stimulation. This effect was observed across a range of HER2 expressing cell lines (IHC3+, 2+, and 1+), including those where cinrebafusp alfa had limited single-agent activity.
Under the amended and restated agreement, Pieris’ option to co-develop and co-commercialize the second of three programs in the collaboration has been amended to provide it with a co-promotion option in the United States, with Seagen solely responsible for the development and overall commercialization of that program. Under the co-promotion option, Pieris will also be entitled to increased royalties from that program in the event that it chooses to exercise the option. In connection with the amendment, on March 24, 2021, in a private placement transaction, Seagen made an equity investment of $13 million in Pieris through the purchase of 3,706,174 newly issued shares of Pieris common stock at a price of $3.51 per share.
"Seagen continues to be a supportive partner, and we look forward to combining efforts in studying the effects of cinrebafusp alfa with TUKYSA in gastric cancer patients expressing lower HER2-levels, following the generation of compelling preclinical data," said Stephen S. Yoder, President and Chief Executive Officer of Pieris. "We plan to initiate this combination study as part of our phase 2 protocol for cinrebafusp alfa, for which we will be sharing additional details at an upcoming corporate update."
"Preclinical data exploring the combination of cinrebafusp alfa and TUKYSA are encouraging and support evaluating the combination in the planned phase 2 clinical trial," said Marjorie Green, M.D., Senior Vice President, Late-Stage Development of Seagen. "We are pleased to supply drug for Pieris to explore the potential combination of these agents to address an important unmet medical need."
About Cinrebafusp Alfa
Cinrebafusp alfa (PRS-343) is a 4-1BB/HER2 fusion protein comprising a 4-1BB-targeting Anticalin protein and a HER2-targeting antibody. The drug candidate is currently in development for the treatment of HER2-positive solid tumors. Based on encouraging phase 1 study results, which demonstrated clinical benefit as single agent and biomarker data indicative of a 4-1BB-driven mechanism of action, the Company is actively working towards initiating a phase 2 study of cinrebafusp alfa in combination with ramucirumab and paclitaxel for the treatment of HER2-positive gastric cancer and, under the phase 2 protocol, in combination with tucatinib.