Compass Therapeutics Inc

We are a clinical-stage, oncology-focused biopharmaceutical company developing proprietary antibody-based therapeutics to treat multiple human diseases. Our scientific focus is on the relationship between angiogenesis, the immune system, and tumor growth. Our pipeline of novel product candidates is designed to target multiple critical biological pathways required for an effective anti-tumor response. These include modulation of the microvasculature via angiogenesis-targeted agents, induction of a potent immune response via activators on effector cells in the tumor microenvironment, and alleviation of immunosuppressive mechanisms used by tumors to evade immune surveillance. We plan to advance our product candidates through clinical development and commercialization as both standalone therapies and in combination with proprietary pipeline antibodies based on supportive clinical and nonclinical data.

Our pipeline consists of four clinical product candidates. Our lead product candidate, tovecimig (formerly known as CTX-009), is a bispecific antibody targeting Delta-like ligand 4 ("DLL4"), a ligand of Notch-1, and vascular endothelial growth factor A ("VEGF-A"). Simultaneous blockade of the VEGF-A and the Notch pathways is known to turn productive angiogenesis into non-productive angiogenesis, which leads to tumor shrinkage and apoptosis. Our second program, CTX-471, is an agonistic antibody targeting a member of the tumor necrosis factor receptor superfamily member 9 (TNFRSF9), also known as CD-137 or 4-1BB, a co-stimulatory receptor which is mostly expressed on activated, but not on resting, T-cells and NK cells. Our third program, CTX-8371, is a bispecific antibody targeting the programmed cell death protein-1 ("PD-1"), an inhibitory immune checkpoint receptor, and its ligand PD-L1, two validated immune-oncology targets. Our fourth program, CTX-10726, is a bispecific antibody targeting PD-1 and VEFG-A.

Tovecimig (CTX-009), our bispecific antibody targeting DLL4 and VEGF-A, is currently being evaluated in a randomized Phase 2/3 trial in the United States in combination with paclitaxel in patients with biliary tract cancer ("BTC") who received one prior treatment regimen. The trial met its primary endpoint with an overall response rate ("ORR") of 17.1% for tovecimig in combination with paclitaxel, including one complete response, compared to a 5.3% ORR for paclitaxel alone. This difference was statistically significant with p=0.031. In the Phase 2/3 trial, the prespecified event threshold of 80% overall survival (OS) events was reached in Q1 2026; therefore, the analyses of progression-free survival (PFS) and OS are expected to be reported in April 2026.

Further, an ongoing Investigator Sponsored Trial ("IST") is evaluating tovecimig in the front-line setting for patients with BTC, combining tovecimig with the standard first-line regimen of gemcitabine, cisplatin, and durvalumab.