Former US President Joe Biden's office confirmed on Sunday that he has been diagnosed with prostate cancer. Earlier, a small nodule was found in his prostate gland, however, not much had been revealed about his medical evaluation.It was last week when Biden went to see the doctors after urinary symptoms and prostate nodule was found. He was then diagnosed with prostate cancer on Friday, and the cancer cells have spread to the bone.“While this represents a more aggressive form of the disease, the cancer appears to be hormone-sensitive which allows for effective management," his office said. "The President and his family are reviewing treatment options with his physicians.”How Is the Aggressiveness Of Prostate Cancer Graded?The aggressiveness of prostate cancers is graded on the basis of Gleason scores. These scores range between 2 to 10, with 8,9,and 10 behaving more aggressively. Biden's office confirmed that his score was 9, suggesting that his cancer is the most aggressive.The Gleason score works on the basis of the lower scores indicating slower growth and spread, and higher scores suggesting more aggressive disease.Like Biden's cancer cells have spread to his bones, it is common for prostate cancer to spread to other parts of the body, especially to bones. Metastasized cancer is more difficult to treat than localized cancer because it's challenging for medication to reach every tumor and eliminate the disease entirely.However, in cases like President Biden’s, where prostate cancer relies on hormones to grow, treatments that block or reduce hormone levels can be effective in targeting the tumors.Dr Matthew Smith of Massachusetts General Brigham Cancer Center told the US News, "It is very treatable, but not curable. Most men in this situation would be treated with drugs and would not be advised to have either surgery or radiation therapy."At the age of 82, Biden's health has been a topic of concern. During his presidency, he had a 'cancerous' skin lesion removed from his chest. In February 2023, the White House in a statement said that the skin tissue was removed and after biopsy it was revealed to be cancerous.How Common Is Prostate Cancer In Men?As per the American Cancer Society, about 1 in 8 men will be diagnosed with prostate cancer during their lifetime. The National Institutes of Health notes that 50% of men between 70 to 80 years of age also showed histological evidence of malignancy.While it is not clear what causes prostate cancer, healthcare professional have often found that age, obesity and a family history of prostate cancer could increase the chances of being diagnosed with it.What Happens In Prostate Cancer?As per Urology Care Foundation, prostate cancer develops when abnormal cells form and grow in the prostate gland. Not all abnormal growths, also called tumors, are cancerous. Some are benign growth and are not life threatening. They also do not spread to nearby tissue or other parts of the body.Whereas cancerous growths can spread to nearby organs and tissues, as in the case of Biden.What Have Been The Reaction On Biden's Diagnosis?The current US President and a long time opponent Donald Trump posted on social media that he was saddened by the news and "we wish Joe a fast and successful recovery."Kamala Harris also posted on social media that she was keeping him and in her family's "hearts and prayers during this time." She wrote: "Joe is a fighter — and I know he will face this challenge with the same strength, resilience, and optimism that have always defined his life and leadership."