When Cancer Comes Back: Cancer Recurrence

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What is cancer recurrence?

Cancer recurrence is defined as the return of cancer after treatment and after a period of time during which the cancer cannot be detected. (The length of time is not clearly defined.) The same cancer may come back where it first started or somewhere else in the body. For example, prostate cancer may return in the area of the prostate gland (even if the gland was removed), or it may come back in the bones. In either case it’s a prostate cancer recurrence.

The difference between recurrence and progression

When cancer spreads or gets worse it is called progression. Sometimes it’s hard to tell the difference between recurrence and progression. For example, if the cancer has been gone for only 3 months before it comes back, was it ever really gone? Is this a recurrence or progression?

Chances are this is not really a recurrence. It’s likely 1 of 2 things happen in cases like this: One is that surgery left behind small clusters of cancer cells that could not be seen or found on scans or other tests. Over time they grow large enough to be detected or cause symptoms. These cancers tend to be very aggressive, or fast-growing.

The second possibility is that the cancer may be resistant to treatment. Chemotherapy (chemo) or radiation may have killed most of the cancer cells, but some of them were either not affected or changed enough to survive the treatment. Any cancer cells left behind can then grow and show up again.

The less time between when the cancer was thought to be gone and the time it came back, the more serious the situation. Most doctors would agree that 3 months of appearing to be cancer-free before cancer returns is too short to be considered a recurrence. There’s no standard period of time within the definition of recurrence, but most doctors consider a cancer to be a recurrence if you’ve had no signs of cancer for at least a year. If your cancer has been gone for only 3 months, this would most likely be a progression of your disease. In this case, the doctors would assume that the cancer never went away totally, even though they could not find it with any tests.

Last Medical Review: 07/28/2015
Last Revised: 07/28/2015