recurrence

(ree-KER-ents) Cancer that has recurred (come back), usually after a period of time during which the cancer could not be detected. The cancer may come back to the same place as the original (primary) tumor or to another place in the body. Also called recurrent cancer.

When cancer comes back after a period when no cancer could be found.

Used especially in reference to the recurrence of physical parameters every 27 days (the rotation period of the sun)