Here's a long (but I think good) article I just ran across....
http://theoncologist.alphamedpress.org/cgi...nt/full/9/6/606
It says that presence of lymph nodes is the biggest predictor, then how many, then size of tumor. That doesn't mean grade isn't a predictor, just not as big as the others. Also, I will highlight one quote from the article:
"In conclusion, tumor grade does have prognostic significance and is primarily used to make decisions for lymph node-negative patients with borderline tumor sizes. "