The aggressiveness of a cancer is based on several factors, including the tumor's grade and stage, and the cells' genetic fingerprint.

Joe Biden’s cancer diagnosis has raised big questions about his health and future. At 82, the former president is battling metastatic prostate cancer, which doctors say has already spread to his bones.

Former U.S. President Joe Biden had not received a test for prostate cancer, known as a PSA, for more than a decade before he was diagnosed with an advanced form of the disease last week, a spokesperson said on Tuesday.