The purpose of this study is to evaluate the incidence of gastric ulcers following administration of either PN 200 or Naproxen in subjects who are at risk for developing NSAID-associated ulcers.
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The primary efficacy variable is the incidence of gastric ulcers, defined as a mucosal break of at least 3 mm in diameter (measured by close application of open endoscopic biopsy forceps) with depth, at anytime throughout 6 months of study treatment.