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Purple Biotech Reports Potential Biomarker Data Support CM24's Mechanism of Action
Oct 6, 2023

REHOVOT, Israel, Oct. 06, 2023 (GLOBE NEWSWIRE) -- Purple Biotech Ltd. ("Purple Biotech" or "the Company") (NASDAQ/TASE: PPBT), a clinical-stage company developing first-in-class therapies that harness the power of the tumor microenvironment to overcome tumor immune evasion and drug resistance, today reported new biomarker data for its lead oncology drug, CM24, a first-in-class anti-CEACAM1 monoclonal antibody. Data were presented at the American Association for Cancer Research (AACR) Special Conference: Pancreatic Cancer in Boston in a scientific poster titled: "Phase 1 Study of CM24 in Combination with Nivolumab in Patients with Advanced Pancreatic Cancer - Survival, Exploratory Biomarkers and Effect on Neutrophil Extracellular Traps (NETs)".

The poster shows that higher pre-treatment levels of tumor infiltrating lymphocytes that express CEACAM1may associated with longer survival in patients treated with CM24 and nivolumab.

In addition, the poster shows high expression of CEACAM1 on neutrophils and NETs , and enhanced levels of serum NETs in PDAC patients, and demonstrates for the first time that CM24 treatment significantly reduced the level of NET marker in patients' serum.

"These encouraging data, demonstrating increased survival of PDAC patients whose biopsies show higher CEACAM1-positive lymphocytes, are consistent with the CM24 Mechanism of Action (MoA) in suppressing the immune evasion and suggest CEACAM1 expressing lymphocytes as a potential biomarker for CM24 therapy" said Purple Biotech VP R&D, Dr. Hadas Reuveni. "In addition, the significant reduction in the levels of NETs in patients' serum following treatment with CM24 suggests a novel MoA that may reduce NET-related complications, especially relevant in PDAC patients, and may be used as a potential pharmacodynamic marker for CM24."

The CM24 and nivolumab combination has shown in phase 1 encouraging initial activity and safety profile in PDAC patients who have progressed after second-line therapy. CM24's novel target is CEACAM1, which is overexpressed on tumor cells and infiltrating immune cells.

CM24 is now being evaluated in a randomized Phase 2 study (NCT04731467) in combination with Bristol Myers Squib's nivolumab plus standard of care (SoC) chemotherapy, as a second line treatment for pancreatic ductal adenocarcinoma (PDAC). The primary endpoint is overall survival of patients treated with CM24 in combination with nivolumab and SoC chemotherapy vs. SoC chemotherapy alone.

"NETs and CEACAM1 will continue to be monitored and investigated in our ongoing randomized Phase 2 study of CM24 in pancreatic cancer patients," stated Purple Biotech CEO, Gil Efron. "We look forward to reporting data from this study in the near term."

The full poster can be viewed on the Purple Biotech website at

About Purple Biotech

Purple Biotech Ltd. (NASDAQ/TASE: PPBT) is a clinical-stage company developing first-in-class therapies that seek to overcome tumor immune evasion and drug resistance. The Company's oncology pipeline includes NT219, CM24 and IM1240. NT219 is a dual inhibitor, novel small molecule that simultaneously targets IRS1/2 and STAT3. In a Phase 1/2 study of NT219, the Company is currently advancing it in a dose escalation as a monotherapy treatment of solid tumors, and in a dose escalation in combination with cetuximab for the treatment of recurrent and metastatic squamous cell carcinoma of the head and neck (SCCHN) or colorectal adenocarcinoma (CRC). These studies will be followed by an expansion phase of NT219 at its recommended Phase 2 level in combination with cetuximab in patients with recurrent and metastatic SCCHN. CM24 is a humanized monoclonal antibody that blocks CEACAM1, an immune checkpoint protein that supports tumor immune evasion and survival through multiple pathways. The Company is advancing CM24 as a combination therapy with anti-PD-1 checkpoint inhibitors in a Phase 2 study for the treatment of pancreatic ductal adenocarcinoma (PDAC). The Company has entered into a clinical collaboration agreement with Bristol Myers Squibb for the Phase 2 clinical trials to evaluate the combination of CM24 with the PD-1 inhibitor nivolumab in addition to chemotherapy. IM1240 is a preclinical, conditionally-activated tri-specific antibody that engages both T cells and NK cells to mount a strong, localized immune response within the tumor microenvironment. The third arm specifically targets the Tumor Associated Antigen (TAA) 5T4 that is expressed in a variety of solid tumors and is correlated with advanced disease, increased invasiveness and poor clinical outcomes. IM1240 has a cleavable capping technology that confines the compound's therapeutic activity to the local tumor microenvironment, and thereby potentially increases the anticipated therapeutic window in patients. The Company's corporate headquarters are located in Rehovot, Israel. For more information, please visit

Forward-Looking Statements and Safe Harbor Statement

Certain statements in this press release that are forward-looking and not statements of historical fact are forward-looking statements within the meaning of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements include, but are not limited to, statements that are not statements of historical fact, and may be identified by words such as "believe", "expect", "intend", "plan", "may", "should", "could", "might", "seek", "target", "will", "project", "forecast", "continue" or "anticipate" or their negatives or variations of these words or other comparable words or by the fact that these statements do not relate strictly to historical matters. You should not place undue reliance on these forward-looking statements, which are not guarantees of future performance. Forward-looking statements reflect our current views, expectations, beliefs or intentions with respect to future events, and are subject to a number of assumptions, involve known and unknown risks, many of which are beyond our control, as well as uncertainties and other factors that may cause our actual results, performance or achievements to be significantly different from any future results, performance or achievements expressed or implied by the forward-looking statements. Important factors that could cause or contribute to such differences include, among others, risks relating to: the plans, strategies and objectives of management for future operations; product development for NT219, CM24 and IM1240; the process by which such early stage therapeutic candidates could potentially lead to an approved drug product is long and subject to highly significant risks, particularly with respect to a joint development collaboration; the fact that drug development and commercialization involves a lengthy and expensive process with uncertain outcomes; our ability to successfully develop and commercialize our pharmaceutical products; the expense, length, progress and results of any clinical trials; the impact of any changes in regulation and legislation that could affect the pharmaceutical industry; the difficulty in receiving the regulatory approvals necessary in order to commercialize our products; the difficulty of predicting actions of the U.S. Food and Drug Administration or any other applicable regulator of pharmaceutical products; the regulatory environment and changes in the health policies and regimes in the countries in which we operate; the uncertainty surrounding the actual market reception to our pharmaceutical products once cleared for marketing in a particular market; the introduction of competing products; patents obtained by competitors; dependence on the effectiveness of our patents and other protections for innovative products; our ability to obtain, maintain and defend issued patents; the commencement of any patent interference or infringement action against our patents, and our ability to prevail, obtain a favorable decision or recover damages in any such action; and the exposure to litigation, including patent litigation, and/or regulatory actions, and other factors that are discussed in our Annual Report on Form 20-F for the year ended December 31, 2022 and in our other filings with the U.S. Securities and Exchange Commission ("SEC"), including our cautionary discussion of risks and uncertainties under "Risk Factors" in our Registration Statements and Annual Reports. These are factors that we believe could cause our actual results to differ materially from expected results. Other factors besides those we have listed could also adversely affect us. Any forward-looking statement in this press release speaks only as of the date which it is made. We disclaim any intention or obligation to publicly update or revise any forward-looking statement or other information contained herein, whether as a result of new information, future events or otherwise, except as required by applicable law. You are advised, however, to consult any additional disclosures we make in our reports to the SEC, which are available on the SEC's website,


Company Contact:
Lior Fhima
Chief Financial Officer

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