Abstract On CStone’s CS1001-101 Trial Accepted For Poster Presentation At ESMO 2019 Annual Congress

CStone Pharmaceuticals (“CStone”, HKEX: 2616) today announced 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) 2019 Annual Congress.

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 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 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. – Bio Space

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