Recent studies show that survival for men with prostate cancer that has spread to the bone is just under two years. But this form of cancer, though aggressive, can sometimes be controlled. Here's what oncologists who treat prostate cancer say are the most common strategies for treating a cancer like Biden's, and some of the challenges.

Former U.S. President Joe Biden has been diagnosed with an "aggressive form" of prostate cancer that has spread to his bones, his office said in a statement on Sunday.