ARQ 087 is an investigational, oral, multi-kinase inhibitor designed to preferentially inhibit the FGFR family of kinases with demonstrated activity in FGFR2 genetic alterations, including fusions. The drug has demonstrated favorable clinical data in a biomarker-driven Phase 1/2 trial in iCCA targeting patients with FGFR2 fusions. Both the FDA and EMA have granted ArQule orphan drug designation for this disease. We plan to initiate a registrational Phase 3 biomarker-driven trial in this indication in Q3 2017 and subsequently seek breakthrough therapy designation with the FDA.
Fibroblast growth factors and their receptors tightly regulate key cellular behaviors, such as proliferation, cell differentiation, cell migration, cell survival and angiogenesis. In human cancers, FGFRs have been found to be dysregulated by multiple mechanisms, including aberrant expression, mutations, chromosomal rearrangements, and amplifications. FGFR dysregulation has been identified as a driver in a number of cancers, including iCCA, cholangiocarcinoma, bladder, endometrial, breast, gastric, lung and ovarian. Current scientific literature suggests FGFR alterations exists in anywhere from 5% to 40% of these cancers. ARQ 087 is a potent FGFR inhibitor that shows strong anti-proliferative activity in cell lines harboring FGFR2 alterations. In clinical testing the molecule has demonstrated activity in cancerous tumors harboring FGFR2 fusions in iCCA and bladder cancers.
Increased FGFR levels were identified as a potential surrogate marker in the phase 1a trial. In our studies with ARQ 087, FGFR2 dysregulation correlates with efficacy. The translation of results from FGFR2 preclinical models into clinical efficacy in patients with FGFR2 fusion driven intrahepatic cholangiocarcinoma is encouraging and shaped the ongoing phase 2 portion of the clinical trial and the design of the planned phase 3 trial.
Intrahepatic Cholangiocarcinoma (iCCA) (bile duct cancer) is a rare and difficult to treat cancer that occurs in the small, tube-like bile ducts within the liver that carry bile to the gallbladder. Current treatment is based on the patient’s stage of the cancer when diagnosed and include resection, chemoradiation and systemic chemotherapy.