• To evaluate the safety of single ascending oral doses of AT2220 administered 1 hour before administration of alglucosidase alfa in patients with Pompe disease • To evaluate the effect of single ascending oral doses of AT2220 administered 1 hour before administration of a single intravenous infusion of alglucosidase alfa on the plasma pharmacokinetics of recombinant human acid alpha-glucosidase (rhGAA) in patients with Pompe disease