SAREUM HOLDINGS PLC

("Sareum" or "the Company")

US Patent Granted for Sareum's SDC-1802 TYK2/JAK1 Inhibitor

Cambridge, UK, 7 October 2021 - Sareum Holdings plc (AIM: SAR), the specialist drug development company delivering targeted small molecule therapeutics to improve the treatment of cancer and autoimmune diseases, announces that, further to its announcement of 30 July 2021, the United States Patent and Trademark Office has now formally approved its patent in respect of an invention associated with Sareum's proprietary SDC-1802 TYK2/JAK1 Kinase Inhibitor Programme (the "SDC-1802 Programme").

The patent (US 11,154,539) will grant on 26 October 2021 and will protect the SDC-1802 molecule and pharmaceutical preparations thereof as a therapeutic to treat cancer selected from pancreatic, colorectal and kidney cancers, melanoma, and B-cell lymphoma by inhibiting TYK2 kinase. This programme is in preclinical development.

Sareum's CSO, Dr John Reader, commented:

"We are pleased to confirm the grant of this US patent for SDC-1802, adding another layer of protection around this promising candidate in key territories. Our SDC-1802 programme is in preclinical development currently and we are designing the translational studies needed to define the optimal cancer application prior to completing toxicology and manufacturing studies. We look forward to providing further updates on progress as we achieve key milestones."

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About Sareum

Sareum is a specialist drug development company delivering targeted small molecule therapeutics to improve the treatment of cancer and autoimmune diseases. The Company aims to generate value through licensing its candidates to international pharmaceutical and biotechnology companies at the preclinical or early clinical trials stage.

Sareum is advancing internal programmes focused on distinct dual tyrosine kinase 2 (TYK2) / Janus kinase 1 (JAK1) inhibitors through preclinical development as therapies for autoimmune diseases, including the 'cytokine storm' immune system overreaction to Covid-19 and other viral infections, (SDC-1801) and cancer immunotherapy (SDC-1802).

Sareum also has an economic interest in SRA737, a clinical-stage oral, selective Checkpoint kinase 1 (Chk1) inhibitor that targets cancer cell replication and DNA damage repair mechanisms. Preliminary Phase 2 and comprehensive preclinical data suggest SRA737 may have broad application in combination with other oncology and immune-oncology drugs in genetically defined patients.

SRA737 was discovered and initially developed by scientists at The Institute of Cancer Research in collaboration with Sareum, and with funding from Sareum and Cancer Research UK. SRA737 was licensed by CRT Pioneer Fund (CPF) to Sierra Oncology Inc. Sierra continues to explore options that would enable the development of SRA737 to advance.

Sareum Holdings plc is listed on the AIM market of the London Stock Exchange, trading under the ticker SAR. For further information, please visit the Company's website at www.sareum.com 

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