A phase II trial of GSK2256098 and trametinib in patients with advanced pancreatic ductal adenocarcinoma (PDAC) (MOBILITY-002 Trial, NCT02428270).

409Background: MEK (mitogen-activated protein kinase kinase) is activated through mutated KRAS in > 90% of PDAC. Focal adhesion kinase (FAK) integrates signals from integrins and growth factor receptors. MEK and FAK are frequently co-activated in PDAC providing a rationale for dual inhibition with GSK2256098, an oral FAK inhibitor, and trametinib, an oral allosteric MEK1/2 inhibitor. Methods: Patients with advanced PDAC patients who progressed after first line chemotherapy were treated with GSK2256098 250mg twice daily and trametinib 0.5mg once daily in 28 day cycles. The primary endpoint was antitumor activity measured by clinical benefit (CB; complete response, partial response, or stable disease ≥24 weeks) by RECIST 1.1. We planned to enrol 24 patients using a 2-stage minimax design (p0 = 0.15, p1 = 0.40; alpha = 0.05, power 0.86). The combination would be considered active if > 7/24 response-evaluable patients achieved CB; and inactive if 2/12 or fewer patients achieved CB at the end of stage 1. Respo...