SUZHOU, China, Nov. 19, 2019 /PRNewswire/ -- CStone Pharmaceuticals ("CStone" or the "Company", HKEX: 2616) today announced that the first patient has been dosed in the Phase I bridging registrational study of ivosidenib (TIBSOVO®) in China. This stand-alone trial is designed to validate the efficacy, safety, and pharmacokinetics of ivosidenib in patients with IDH1 mutant relapsed or refractory acute myeloid leukemia (R/R AML). Developed by CStone's partner, Agios Pharmaceuticals (NASDAQ: AGIO), ivosidenib was approved by the U.S. FDA in July 2018 for the treatment of adult patients with R/R AML with a susceptible IDH1 mutation as detected by an FDA-approved test. In May 2019, CStone submitted a new drug application (NDA) for ivosidenib in Taiwan for the treatment of adult patients with IDH1 mutant R/R AML. Current standard of care treatment for newly diagnosed AML patients mainly includes intensive induction chemotherapy (IC), followed by consolidation therapy such as allogeneic hematopoietic stem cell transplantation (Allo-HSCT) in order to attain durable remission. Approximately 35% to 40% of those treated patients achieve complete remission, while only about 25% achieve 3 years or longer survival. The majority of AML patients develop acquired resistance to treatment or eventually relapse, leading to R/R AML, which has a very poor prognosis in the absence of standard of care treatment options globally. With the emergence of DNA sequencing technology, the detection of genetic mutations has presented new opportunities and challenges in AML treatment. IDH1 mutations are associated with around 6% to 10% of all AML cases.