On July 15, 2022 HUTCHMED (China) Limited ("HUTCHMED") (Nasdaq/AIM:HCM; HKEX:13) reported that it has initiated a Phase I trial in China of HMPL-A83, an investigational novel IgG4-type humanized anti-CD47 monoclonal antibody (Press release, Hutchison China MediTech, JUL 15, 2022, View Source [SID1234616701]). The first patient received their first dose on July 15, 2022.
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The Phase I trial is a multicenter, open-label study to evaluate the safety, tolerability, pharmacokinetics and preliminary efficacy of HMPL-A83 in patients with advanced malignant neoplasms. The primary endpoints are dose-limiting toxicity (DLT), safety, tolerability, recommended phase II dose (RP2D) and maximum tolerated dose (MTD). The secondary endpoints include pharmacokinetics, pharmacodynamics, immunogenicity and preliminary efficacy profile. The lead principal investigators are Dr Ye Guo of Shanghai East Hospital and Dr Yuping Sun of Shandong Cancer Hospital. Additional details may be found at clinicaltrials.gov, using identifier NCT05429008.
Dr Weiguo Su, Chief Executive Officer and Chief Scientific Officer of HUTCHMED, said: "HMPL-A83 marks a new chapter in our large molecule and immunotherapy exploration. It is our thirteenth oncology drug candidate to emerge from our innovative in-house discovery platform and it has significant potential to offer new combination therapy opportunities with our existing small molecule portfolio. This approach forms a key part of our multi-pronged strategy to treat cancer and immunological diseases and we are very excited to advance HMPL-A83’s development."
About HMPL-A83 and CD47
CD47 is a cell surface transmembrane protein that is ubiquitously expressed on virtually all human cells. The overexpression of CD47 is reported in a variety of tumors and is believed to be associated with immune escape from macrophage-mediated phagocytosis.
HMPL-A83 is an investigational IgG4-type humanized anti-CD47 monoclonal antibody that exhibits high affinity for CD47. HMPL-A83 blocks CD47 binding to Signal regulatory protein (SIRP) α and disrupts the "do not eat me" signal that cancer cells use to shield themselves from the immune system.
In preclinical studies, HMPL-A83 demonstrated weak affinity for red blood cells and no induction of hemagglutination, implying low risk of anemia. HMPL-A83 also demonstrated a high affinity for CD47 antigen on tumor cells and strong phagocytosis induction of multiple tumor cells. HMPL-A83 has also demonstrated strong anti-tumor activity in multiple animal models.