On April 4, 2018 Siamab Therapeutics, Inc., a biopharmaceutical company developing novel glycan-targeted cancer therapeutics, reported that it will present new research findings for its ST1 monoclonal antibody (mAb) therapeutic program during a poster presentation at the American Association for Cancer Research (AACR) (Free AACR Whitepaper) Annual Meeting 2018, being held April 14-18, 2018, at McCormick Place in Chicago (Press release, Siamab Therapeutics, APR 4, 2018, View Source [SID1234525179]). Myeloid derived suppressor cells (MDSCs) are shown to express Sialyl-Tn (STn) across a wide range of patient tumor samples and may therefore represent an optimal therapeutic target for the ST1 program. MDSCs are major regulators of the tumor anti-immune response that act by suppressing T cells. Ovarian xenograft model data will be presented that further demonstrates the potential for targeting STn+ MDSCs with ST1 in a clinical setting. ST1, Siamab’s lead program, is in late stage preclinical development formatted as an antibody drug conjugate (ADC) for the treatment of STn-expressing solid tumors.
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"We are pleased to present new patient tumor data and ovarian carcinoma xenograft data for our ST1 antibody drug conjugate targeting STn at the AACR (Free AACR Whitepaper) 2018 annual meeting," said Jeff Behrens, president and chief executive officer of Siamab. "These research findings are exciting as they continue to show that STn provides a uniquely glycan-specific target for the treatment of solid tumors. Importantly, the findings demonstrate that our antibody therapeutic targeting STn offers the potential to go beyond tumor targeting to also directly target and deplete immune-suppressive MDSCs, enabling immune system re-engagement and increasing the potential for better patient outcomes."
The poster presentation will highlight new data showing the presence of STn on the surface of MDSCs in a growing body of patient tumor samples, as well as data in patients and xenograft models linking STn expression on MDSCs to tumor cell STn expression. In addition, the poster will highlight data that demonstrates depletion of STn+ MDSCs after treatment with an anti-STn ADC in an ovarian carcinoma xenograft model.
Details for the poster presentation are as follows:
Abstract Title and Number: Myeloid derived suppressor cells (MDSCs) express Sialyl Tn (STn) and are a therapeutic target for anti-STn antibody drug conjugates (#6892)
Date: Wednesday, April 18, 2018
Time: 8:00 a.m.-12:00 p.m. CT
Session Title: Therapeutic Antibodies, including Engineered Antibodies 4
Location: McCormick Place, Poster Section 28
Poster Board Number: 20
Siamab’s proprietary technology platform enables the development of highly specific mAb therapeutics, including ADCs, targeting cancer cell surface glycans called tumor-associated carbohydrate antigens (TACAs). TACAs are an emerging set of tumor specific antigens implicated in immune suppression, chemoresistance and a cancer stem cell (CSC) phenotype. STn, the sialylated version of the carbohydrate Tn antigen, is broadly expressed in human cancers including ovarian, gastric, colon, prostate, pancreatic and lung. The presence of STn in tumors is associated with metastatic disease, poor prognosis, and reduced overall survival. Tumor STn expression is well-established and can be leveraged for targeted cancer therapy; however, its expression on immuno-suppressive tumor infiltrating lymphocytes, such as MDSCs, is a new finding. Siamab has identified and utilized the presence of STn on MDSCs to target and deplete MDSCs in vivo, providing a potential novel therapeutic approach for the treatment of solid tumors.
A copy of the poster will be made available on the company’s website after the presentation.