Former president Joe Biden marked the end of a major round of cancer treatment, ringing a bell after completing weeks of radiation therapy for an aggressive form of prostate cancer.

“I can confirm that he has completed a course of radiation therapy,” Biden spokesperson Kelly Scully said in a statement, adding that the former president “rang the bell” at Penn Medicine Radiation Oncology in Philadelphia.

Ringing the bell is a long-standing ritual for patients finishing a course of treatment and symbolizes progress in a patient’s treatment.

Biden’s office first announced his diagnosis in May, revealing that the cancer had spread to his bones but was responding to hormone therapy, which doctors said allowed for “effective management.”

The 82-year-old also underwent surgery last month to

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