Joe Biden is undergoing a new phase of treatment after revealing in May he has an aggressive form of prostate cancer.
The ex-US President, 82, received radiation therapy and hormone treatment.
In September, Biden had a procedure known as Mohs surgery to remove cancerous cells from his skin .
A large bandage on his forehead was visible in public appearances at that time.
His spokesman said on Saturday: “As part of a treatment plan for prostate cancer, President Biden is currently undergoing radiation therapy and hormone treatment.”
The Democrat, who turns 83 next month, revealed that he had been diagnosed with metastatic prostate cancer.
His team said the illness was aggressive but hormone-sensitive, meaning it was likely to respond to treatment, and he is “doing well”, according NBC News.
Mr Biden previously said the cancer had “a Gleason score of 9 (Grade Group 5) with metastasis to the bone”, meaning it had spread from the prostate.
The radiation treatment is expected to last five weeks and marks a new stage in his care.
He has already been taking a pill form of hormone medication.
Prostate cancer is very common among men of Mr Biden’s age but many have a low-risk form that only requires monitoring.
His four years in power ended in January when Republican President Donald Trump won the election defeating his would-be successor, Kamala Harris.
Mr Biden’s presidency was beset by concerns over his physical health and mental acuity, culminating in a disastrous TV debate that saw him eventually step back as candidate.
