ES104 (CTX-009/ABL001) Clinical Data Presented at the 2021 AACR-NCI-EORTC International Conference
September 10,2021 PDF Version

1. ES104 was well tolerated and demonstrated single agent activity in heavily pre-treated patients with solid tumor who are resistant to anti-VEGF therapies, mostly of colorectal and gastric origins;

2. The structural differences between ES104 and other bispecifics targeting these pathways, as well as the affinities and avidities to their targets, may be the drivers for the differentiated safety and efficacy data observed;

3. The maximum tolerated dose (MTD) was not reached, and the recommended Phase 2 doses (RP2D) of ES104 were determined to be 10.0 and 12.5 mg/kg biweekly;

4. Overall response rate (ORR) of ES104 as a monotherapy across all doses tested (0.3 - 17.5 mg/kg) was 8% and the disease control rate (DCR) was 62% in patients treated at the 3rd and 4th line settings;

5. Treatment with ES104 at the RP2D (10.0 mg/kg and 12.5 mg/kg) led to 19% (n=3/16) ORR, not including an additional unconfirmed partial response, and a 69% DCR (n=11/16);

6. A Phase 1b study of ES104 in combination with chemotherapy and a Phase 2 study are underway.  


BOSTON, Mass, USA, SEONGNAM, S. Korea, SHANGHAI/SUZHOU, China,  Oct. 8th, 2021. Elpiscience Biopharma, Compass Therapeutics, Inc. (OTC:CMPX) and ABL Bio (KOSDAQ: 298380) presented today clinical trial data for ES104 (CTX-009/ABL001), a dual anti-angiogenic bispecific antibody targeting DLL4 and VEGF-A, at an oral plenary session during the AACR-NCI-EORTC International Conference on Molecular Targets and Cancer Therapeutics (Abstract Number: 4749; Session Title: Plenary Session 2: New Drugs on the Horizon I).


The first in human Phase 1 single agent dose escalation and expansion study evaluated ES104 across nine dose levels. The study enrolled 45 heavily pre-treated patients with cancers primarily of colorectal and gastric origin. ES104 was well tolerated across all doses evaluated, with no dose-limiting toxicities reported. The most frequent treatment related adverse event was hypertension, observed in 17 patients of the 45 patients enrolled. Among those, 7 patients reported Grade 3 hypertension and the rest had Grade 1 or Grade 2. Only 4 mild cases of pulmonary hypertension were reported that were all reversible, and ES104 demonstrated significant clinical activity as a stand-alone therapy. The majority (87%) of the patients enrolled in the study had ECOG performance status of 1; 42% (n=19) were patients with gastric cancer and 40% (n=18) were patients with colorectal cancer with a median of three prior lines of systemic anticancer therapies. Importantly, 62% of the patients enrolled were previously treated with anti-VEGF antibodies containing regimens. There were 4 partial responses (including three partial responses confirmed by RECIST 1.1 and one partial response which was unconfirmed) and 20 stable diseases among 39 evaluable patients. The confirmed overall response rate (ORR) across all dose levels tested (0.3 – 17.5mg/kg) was 8%, not including 1 unconfirmed partial response, and the disease control rate (DCR) across all dose levels was 62%. The ORR at the recommended phase 2 doses (RP2D) of 10.0-12.5 mg/kg was 19% (n=3/16) not including one unconfirmed partial response, and the DCR at the RP2D was 69% (n=11/16).


“We are happy to see the next frontier of anti-angiogenic therapies, ES104 showing promising anti-tumor activity in a Phase 1 study as monotherapy,” said Steve Chin, MD, CMO of Elpiscience Biopharma, “We look forward to initiating the clinical trials in China to explore its therapeutic potential in the heavily pre-treated digestive tract cancer patients.”


“This is a significant clinical result because current approved anti-angiogenic drugs have little efficacy as a monotherapy. Furthermore, 94% of the colorectal patients and 58% of the gastric patients in this study were previously treated with Avastin® (bevacizumab) or Cyramza® (ramucirumab), respectively; the response rate is almost three times that seen for current 3rd and 4th line therapies in patients with colorectal and gastric cancers.” said Jeeyun Lee, MD, a Professor at the Samsung Medical Center, Seoul, South Korea and the principal investigator of the study.


“The responses to ES104 (CTX-009/ABL001) as a monotherapy in this refractory patient population combined with the excellent tolerability profile suggests that ES104 (CTX-009/ABL001) can become an important drug for a broad range of solid tumors” said Thomas Schuetz, MD, PhD, CEO and scientific Founder of Compass Therapeutics. “We look forward to developing ES104 (CTX-009/ABL001) in the United States and other geographies and to unlocking its full potential”. Compass Therapeutics of Boston, Massachusetts holds the global rights to ES104 (CTX-009/ABL001) with the exception of S. Korea (rights held by Handok) and China (rights were out-licensed to Elpiscience Biopharma).


“We are pleased to present the clinical data of ES104 (CTX-009/ABL001) for the first time at a prominent international conference,” said Sang Hoon Lee, PhD, CEO of ABL Bio. “ES104 (CTX-009/ABL001) has demonstrated its potential to benefit cancer patients, especially those that have been unable to experience improvements with standard treatments. We expect to further validate the therapeutic value of ES104 (CTX-009/ABL001) as it progresses through clinical trials in the U.S., China and South Korea.”


About ES104:

ES104 (CTX-009/ABL001) is a bispecific antibody that simultaneously blocks Delta-like ligand 4/Notch (DLL4) and vascular endothelial growth factor A (VEGF-A) signaling pathways, which are critical to angiogenesis and tumor vascularization.  Pre-clinical and early clinical data of ES104 suggests that blockade of both pathways provides robust anti-tumor activity across several solid tumors, including colorectal, gastric, cholangiocarcinoma, pancreatic and non-small cell lung cancer. Partial responses to ES104 as a monotherapy have been observed in heavily pre-treated cancer patients, who were resistant to currently approved anti-VEGF therapies. ES104 has completed a Phase 1 monotherapy dose escalation and expansion study. Phase 1b and Phase 2 combination studies are ongoing.


About Elpiscience Biopharma:

Elpiscience is a clinical stage biopharmaceutical company focusing on innovating and developing the next generation of cancer immunotherapy. Elpiscience has developed a pipeline of globally innovative molecules, covering a wide range of targets with a particular focus on turning “cold” tumors “hot”.  The company has four assets in clinical stage (ES101, ES102, ES104 and ES002). Elpiscience’s sustainable pipeline forms a strong cornerstone for developing the next generation and more effective immunotherapies. Founded and managed by seasoned executives in the biopharma industry, Elpiscience is backed by renowned investors such as Lilly Asia Ventures, Hillhouse Capital, Hyfinity Investments, Greater Bay Area Homeland Development Fund, CDH, Cormorant Asset Management and Superstring Capital. Elpiscience endeavors to advance at least one world-class molecule into the clinic each year, providing clinical benefits to cancer patients worldwide.


About Compass Therapeutics:

Compass Therapeutics, Inc. is a clinical-stage, oncology-focused biopharmaceutical company developing proprietary antibody-based therapeutics to treat multiple human diseases. Compass’ scientific focus is on the relationship between angiogenesis, the immune system, and tumor growth. The company 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. Compass plans to advance its product candidates through clinical development as both standalone therapies and in combination with proprietary pipeline antibodies based on supportive clinical and nonclinical data. The company was founded in 2014 and is headquartered in Boston, Massachusetts.


About ABL Bio:

ABL Bio, Inc. (KOSDAQ: 298380) is a clinical-stage biotechnology company developing antibody therapeutics for immune-oncology and neurodegenerative diseases. With internal R&D and global partnerships, ABL has developed multiple bispecific antibody platforms, such as ‘Grabody-T,’ ‘Grabody-I’ and ‘Grabody-B’ and built an innovative pipeline of multiple clinical and pre-clinical stage drug candidates. In the oncology area, ABL has developed Grabody-T, a modular 4-1BB engaging platform that has demonstrated superior efficacy and safety. In the neurodegenerative disorder space, ABL has developed Grabody-B, which is designed to maximize blood-brain barrier (BBB) penetration. Grabody-B is applicable to various CNS targets across a plethora of neurological disorders, potentially providing a breakthrough to address the high unmet medical needs in neurodegeneration.

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