I-Mab Biopharma (IMAB) Announces Multiple Clinical Advancements of Its Differentiated CD73 Antibody Uliledlimab in China and the U.S.

I-Mab (Nasdaq: IMAB), a clinical stage biopharmaceutical company committed to the discovery, development and commercialization of novel or highly differentiated biologics, today announced multiple clinical advancements for its proprietary and highly differentiated CD73 antibody, uliledlimab (also known as TJD5, or TJ004309) in advanced solid tumors. The Company plans to present detailed clinical results at select scientific conferences this year.

CD73 is implicated in tumor resistance to checkpoint immunotherapies as it plays a critical role in adenosine-mediated immune suppression in tumor microenvironment. Uliledlimab is a humanized CD73 antibody and works effectively on modulating tumor microenvironment through inhibition of the adenosine pathway. Uliledlimab is shown to strongly suppress tumor growth especially when combined with a PD-(L)1 inhibitor in pre-clinical studies. As a differentiated CD73 antibody, uliledlimab interacts with a unique epitope to function through a novel intra-dimer binding mode, thus enabling differentiated and favorable functional properties. Detailed data from the pre-clinical and mechanistic studies have been submitted for presentation at the upcoming American Association of Cancer Research Annual Meeting.

I-Mab has made significant progress in the global clinical development of uliledlimab. In China, I-Mab is advancing the phase 1/2 dose escalation and cohort expansion study of uliledlimab as a single agent and in combination with toripalimab (TUOYI®) in patients with advanced or metastatic cancers who are refractory to or intolerant of available therapies. On February 3, 2021, the first patient in the combination study was dosed.

In the U.S., I-Mab has completed the initial assessment of its clinical study investigating uliledlimab monotherapy lead-in followed by combination with atezolizumab (Tecentriq®) in patients with solid tumors. Topline results from a clinical study under contract with TRACON show that uliledlimab is safe and well tolerated at the dose range evaluated and demonstrate clinical activity in patients with advanced solid tumors. The Company is scheduled to submit an abstract to ASCO for the 2021 annual meeting.

"We are encouraged and very pleased by the clinical results and overall advancements of uliledlimab in both China and the U.S.," said Dr. Joan Shen, CEO of I-Mab. "We believe that the combination of uliledlimab with immune checkpoint inhibitors, such as toripalimab or atezolizumab, has the potential to offer a novel treatment option with intended clinical benefit in cancer patients who do not or poorly respond to current checkpoint immunotherapies."

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