Former President Joe Biden is undergoing a new phase of treatment for an aggressive form of cancer that was diagnosed in May, a spokesperson said on Saturday.

“As part of a treatment plan for prostate cancer, President Biden is currently undergoing radiation therapy and hormone treatment,” according to the spokesperson for the former president.

The radiation treatment is expected to span five weeks and marks a new point in his care, the spokesperson said. He has already been taking a pill form of hormone medication, they added.

Last month, Biden also had a skin cancer treatment known as Mohs surgery. A large bandage on his forehead was visible in public appearances at that time.

The former president announced in May that he had been diagnosed with an aggressive form of prostate cancer that had already metastasized to his bones.

His office said at the time that he was pursuing several treatment options to ensure “effective management” of the illness.

The former president, who turns 83 next month, is said to be “doing well.”