Radioactive iodine treatment may also be used to treat thyroid cancer that recurs after treatment or that spreads to other areas of the body.

CNN: Thyroid cancer

The Drumcree stand-off is not central to the fraught peace process, but it recurs as a kind of barometer of unionist public opinion.

ECONOMIST: Green, orange, 10% black

Later studies showed that when breast cancer recurs, it comes back about 90% of the time close to where the original tumor was.

WSJ: New Scrutiny for Popular Breast-Cancer Treatment