What are the odds of a breast cancer recurrence?

Depends: Tumor factors - based on TNM staging, receptor status, grade etc treatment factors - optimal therapy vs. Not patient factors - genetic predisposition - this is rarely the issue time factor - longer the time lapse since initial therapy, lesser the odds.

Variable: Depends on the stage of the cancer. In general - the node status is most important (assuming that you mean cancer that has not already metastasized). More positive nodes = more likely recurrence. Size of the tumor is important. Tumors that do not have estrogen receptor, those with a high proliferative index (ki-67) and those with her-2-neu markers all have higher recurrence rates.