Joe Biden has started radiation therapy as part of his treatment for prostate cancer.

"As part of a treatment plan for prostate cancer, President Biden is currently undergoing radiation therapy and hormone treatment," a spokesperson for the former president told CNN.

The news was first reported by NBC News .

A spokesperson for the former president, who turns 83 next month, did not give a timeline for the treatment.

A source told CNN he began the treatment a few weeks ago.

Biden's personal office revealed in May that he had been diagnosed with an "aggressive form" of prostate cancer that had spread to his bones.

"The expectation is we're going to be able to beat this," Biden told CNN in his first comments about the diagnosis two weeks after he received it.

"It's not in any o

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