Former U.S. President Joe Biden has commenced radiation therapy as part of his ongoing treatment for prostate cancer, according to a statement from his spokesperson. The 82-year-old is also receiving hormone therapy, though specific details regarding this treatment remain undisclosed. A source familiar with the matter revealed to NBC News that the radiation therapy is expected to last five weeks, marking a significant phase in his medical care. Biden was diagnosed in May with an aggressive form of prostate cancer, which had metastasized to his bones. The diagnosis followed urinary symptoms that prompted medical examinations, leading to the discovery of a small nodule on his prostate. At the time, Biden’s office described the cancer as having a Gleason score of 9 (Grade Group 5), indicating a high-grade, fast-spreading form of the disease. However, the cancer is hormone-sensitive, which allows for effective management. Biden, who left office in January as the oldest serving U.S. president in history, faced persistent health concerns during his first term, ultimately leading him to withdraw from the 2024 re-election campaign. His former vice president, Kamala Harris, subsequently ran as the Democratic presidential candidate but lost to current President Donald Trump.