Pieris Pharmaceuticals Announces Milestone Achievement for Boston Pharmaceuticals’ Initiation of Phase 1/2 Study of BOS-342, a 4-1BB/GPC3 Immuno-Oncology Bispecific

Excerpt from the Press Release:

BOSTON, MA / ACCESSWIRE / August 17, 2023 / Pieris Pharmaceuticals, Inc. (NASDAQ:PIRS), a clinical-stage biotechnology company focused on novel biotherapeutics through its proprietary Anticalin^® technology platform for respiratory diseases and cancer, today announced that the Company has achieved an undisclosed milestone payment from Boston Pharmaceuticals. The milestone is based on dosing the first patient in a Boston Pharmaceutical-sponsored phase 1/2 study of BOS-342 (formerly PRS-342), a 4-1BB/GPC3 immuno-oncology antibody-Anticalin fusion (Mabcalin™) bispecific protein, which was discovered by Pieris and licensed to Boston Pharmaceuticals and designed to provide a potent costimulatory bridge to exert tumor killing activity through the recruitment of T-cells.

The open-label phase 1/2 study is designed to evaluate the safety, tolerability, pharmacokinetics, and efficacy of BOS-342. The Phase 1 dose escalation portion of the study is expected to enroll adults with hepatocellular carcinoma (HCC) that progressed on at least one prior treatment and establish a recommended Phase 2 dose. If pursued, the Phase 2 portion of the study will evaluate efficacy, as measured by overall response rate.

The study is funded and conducted by Boston Pharmaceuticals, who exclusively licensed worldwide rights to BOS-342 in April 2021. In addition to the milestone announced today, Pieris could potentially be entitled to receive up to approximately $350 million in development, regulatory and sales-based milestone payments, and tiered royalties on sales of BOS-342.

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