Xspray Pharma AB (publ) announced the online publication of its abstract titled "Frequency of comedyication of Proton Pump Inhibitors with Crystalline Dasatinib in Chronic Myeloid Leukemia and Effects on TKI-Bioavailability" for presentation at the upcoming American Society of Clinical Oncology (ASCO) Annual Meeting in Chicago on June 3rd, 2024 at 9-12 AM, Poster nr. 120. While Tyrosine Kinase Inhibitors (TKI), including dasatinib, have profoundly improved clinical outcomes in patients with chronic myeloid leukemia (CML), the bioavailability and systematic exposure of the crystalline formulation of dasatinib is reduced by comedication with acid reducing agents which may affect the clinical response and comedication with proton pump inhibitors, such as omeprazole, should be avoided.

The collaborative analysis with Uppsala University and the Karolinska Institute and University Hospital demonstrates that 54% of CML patients identified in the Swedish CML-register were prescribed at least one PPI and 34% of TKI-treated patients were comedicated with a PPI. Of those prescribed a PPI, 66% of the prescriptions were by a different healthcare provider. Further, the presentation provides new information on the bioavailability of crystalline dasatinib when comedicated with a PPI, demonstrating a substantially higher than previously reported impact of PPIs on the bioavailability of crystaline dasatinib, with Cmax and AUC24 being reduced by 96% and 88% respectively.