My mom has 6mm uterine polyp discovered today after little spotting. Her age is 56. What is the % risk of cancer in numbers. She ll take it & test it?

What did her gyn say. She needs it sampled and also the endometrium sampled that is not a polyp, she needs her doc to do a hysteroscopy and polyp removal and endometrial sampling I do almost all of mine in office odds are in her favor that it is not cancer but if could be precancerous so it needs to be removed.