Breakthrough in Finding Prostate Cancer Cells in Body?

Just saw this article in the New York Times titled "New Scan finds Prostate Cancer Cells hiding in the Body":

After doctors found cancer in Dr. Mark Samberg’s prostate last spring, the 70-year-old retired urologist prepared to have his prostate removed. He knew that the surgery would cure him, assuming the cancer was confined to the organ.

But his doctors had a nagging concern — the cancer cells seen on the biopsy were aggressive and may already have escaped from his prostate. If so, the operation would not cure him. The problem for Dr. Samberg, and for many men with aggressive prostate cancer, was this: If there are cancer cells outside the prostate, how can they be found?

Now the Food and Drug Administration has approved a test that can locate prostate cancer cells wherever they are. Exuberant cancer specialists said the test would alter treatment for patients nationwide

“It’s the most exciting thing in prostate cancer in my lifetime,” said Dr. Kirsten Greene, chair of the urology department at the University of Virginia School of Medicine.

The test relies on a radioactive tag attached to a molecule that homes in on prostate cancer cells that have spread to other locations in the body and may seed new tumors. Once tagged, the clusters of cells appear as bright spots on PET scans....