In endoscopy done for my Mom, we found some polyps in her stomach. She has been using PPI's for about 3 yrs now. Is there possibility for cancer?

Unlikely. Polyps in the Stomach are commonly not cancerous. But depending on the size of the polyp, either a needle biopsy or removal may be considered. What did your doctor do... and advise you for future monitoring or treatment for this polyp???