On August 19, 2019 CStone Pharmaceuticals ("CStone", HKEX: 2616) reported that an abstract on the company’s ongoing CS1001-101 Phase Ib clinical study has been accepted for poster presentation at the upcoming European Society for Medical Oncology (ESMO) (Free ESMO Whitepaper) 2019 Annual Congress (Press release, CStone Pharmaceauticals, AUG 19, 2019, View Source [SID1234538871]).
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CS1001 is an investigational anti-PD-L1 monoclonal antibody developed by CStone, and one of the company’s three backbone immunotherapy assets. CS1001 is currently being evaluated in a number of clinical trials in China, including one multi-arm Phase I study, two registrational Phase II studies, and three Phase III clinical studies.
CS1001-101 is a Phase Ia/Ib open-label, multiple-dose, dose-escalation and expansion study assessing the safety, tolerability, pharmacokinetics and anti-tumor efficacy of CS1001 in patients with advanced solid tumors or lymphomas. The study has already completed its dose-escalations. According to data released at the ASCO (Free ASCO Whitepaper) 2019 Annual Meeting, as of the data cut-off of November 30, 2018, 7 of the 29 enrolled patients showed partial response, with an overall response rate (ORR) of 24% (6 patients are still on treatment). This data demonstrates CS1001’s durable anti-tumor activities in a variety of solid tumors and lymphomas.
The updated data to be presented at the ESMO (Free ESMO Whitepaper) 2019 Annual Congress includes the safety data from the CS1001 Phase Ia/Ib study, and efficacy data of CS1001 in gastric cancer, esophageal cancer, MSI-H cancer and cholangiocarcinoma from the Phase Ib study. It is worth mentioning that, based on previously released data, CS1001 has shown good overall safety and tolerability, and durable anti-tumor activities across different tumor types.
About CS1001
CS1001 is an investigational monoclonal antibody directed against PD-L1 being developed by CStone. Authorized by the U.S. based Ligand Corporation, CS1001 is developed by the OMT transgenic animal platform, which can generate fully human antibodies in one step. As a fully human, full-length anti-PD-L1 monoclonal antibody, CS1001 mirrors natural G-type immune globulin 4 (IgG4) human antibody, which can reduce the risk of immunogenicity and potential toxicities in patients, potentially representing a unique advantage over similar drugs.
CS1001 has completed a Phase I dose-escalation study in China, in which CS1001 showed good tolerability and produced sustained clinical benefits during the Phase Ia stage of the study.
CS1001 is being investigated in a number of ongoing clinical trials, including one Phase I bridging study in the U.S. In China, its clinical program includes one multi-arm Phase Ib study, two pivotal Phase II studies, and three Phase III studies for several tumor types.