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.

Prostate cancer is one of the most common types of cancer in men and grows very slowly, says NLM. Chances of a diagnosis increases with age.