Former President Joe Biden has completed a major round of cancer treatment, according to his family, following months of battling an aggressive form of prostate cancer that doctors say had spread to his bones.

The update came directly from Biden’s daughter, Ashley Biden, who shared an emotional message Monday on Instagram. In a short video post, she revealed that her father had finished a critical stage of his treatment, writing, “Rung the bell! Thank you to the incredible doctors, nurses, and staff at Penn Medicine. We are so grateful. Dad has been so damn brave throughout his treatment.”

Ringing the bell is a long-standing tradition among cancer patients to mark the end of a major treatment phase, often signaling hope and perseverance after weeks or months of therapy.

A spokesperson for Biden later confirmed to CNN that the former president recently completed a course of radiation therapy, though his medical team has not yet determined what the next steps in his treatment will be. The update offered cautious optimism but made clear that Biden’s health journey is far from over.Biden’s post-presidential office first disclosed his diagnosis in May, revealing that doctors discovered the cancer after he reported urinary symptoms. Tests later confirmed the disease had metastasized, or spread to his bones—a serious development that significantly complicates treatment.