NEW YORK, May 20 (Xinhua) -- Former U.S. President Joe Biden has been diagnosed with an aggressive form of prostate cancer that has spread to the bone, and doctors not involved in his care said his diagnosis showed the nuance and challenges of screening for prostate cancer, reported USA Today on Tuesday.
Some have suggested that Biden likely knew about his cancer for a long time, but it's possible, several doctors said, that his tumor was missed or that he has a particularly aggressive form of cancer that was unlikely to be detected by routine testing.
