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Story summary
- Joseph R. Biden Jr. (D-Del.), 83, is undergoing treatment for stage 4 metastatic prostate cancer that has spread.
- Aides say he is doing well, but friends worry about fatigue.
- Public appearances are limited, fueling questions about health and legacy.
- A book by CNN's Jake Tapper alleges Biden's aides concealed the severity of his health issues.
- Memoirs from former officials criticize his decision to run, arguing it harmed the 2024 Democratic prospects.
