A Phase 1 Dose Escalation Study of GC4419 in Combination With Chemoradiation for Squamous Cell Cancer of the Head & Neck

GC4419 is a novel, highly stable manganese-containing macrocyclic ligand complex with a molecular weight of 483, whose activity mimics that of naturally occurring superoxide dismutase (SOD) enzymes. It is therefore a prototype of a new class of drugs termed selective SOD mimetics. GC4419 selectively removes superoxide anions without reacting with other reactive oxygen species, including nitric oxide, hydrogen peroxide, and peroxynitrite.