What are the chances of cancer recurrence?

I was diagnosed last year with Low grade Mucoepidermoid Carcinoma of the salivary gland. It was in an unusual place though, located on the pallet of my mouth. I had oral surgery to remove the pallet and the margins were clear. Now that my mouth has healed quite drastically (leaving only a small fistula) and is somewhat normal I noticed that another growth has reappeared. I am just curious, what are the chances, with it being low grade and all, of recurrence.