Former President Joe Biden has completed a round of radiation therapy to treat an aggressive form of prostate cancer — an encouraging sign of progress — but one that does not signal the end of his treatment.

A Biden spokeswoman confirmed to CBS News Monday that the former president, who turns 83 next month, finished several weeks of radiation therapy treatment Monday at Penn Medicine Radiation Oncology in Philadelphia. His office first announced Oct. 11 that the former president had been undergoing radiation treatment for prostate cancer for several weeks.

"He rang the bell today," Biden spokeswoman Kelly Scully said.

Ashley Biden, the daughter of the former president, posted on Instagram a quick video clip of her father ringing the bell, with the caption, "Rung the bell! Thank

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