The goal of this clinical study is to learn more about the long-term safety, effectiveness
and prolonged action of Kite study drugs, axicabtagene ciloleucel, brexucabtagene autoleucel,
KITE-222, KITE-363, KITE-439, KITE-585, and KITE-718, in participants of Kite-sponsored
interventional studies.

This is a global, multicenter Phase 1/3 study to evaluate the efficacy and safety of
selinexor plus ruxolitinib in JAK inhibitor (JAKi) treatment-nave myelofibrosis (MF)
participants. The study will be conducted in two phases: Phase 1 (open-label) and Phase 3
(double-blind). Phase 1 (enrollment completed) was an open-label evaluation of the safety and
recommended dose (RD) of selinexor in combination with ruxolitinib and included a dose
escalation using a standard 3+3 design (Phase 1a) and a dose expansion part (Phase 1b). In
Phase 3, JAKi treatment-nave MF participants are enrolled in 2:1 ratio to receive the
combination therapy of selinexor + ruxolitinib or the combination of placebo + ruxolitinib.