Is radiotherapy to prostate useful even after the cancer has escaped from prostate?

Yes, it can be helpful but only in certain circumstances.

Former US President Biden is in the news this week and multiple media outlets reports that Biden is having  radiation therapy to prostate along with hormone therapy.

The news outlets also indicate that Biden has aggressive prostate cancer which has spread to the bones.

Any spread of prostate cancer to bones is classified as stage 4 prostate cancer.

If cancer has NOT spread outside the prostate, the combination of radiation and hormones could be curative .

But, with stage 4 prostate cancer, radiation is generally not curative. This is because once the cancer cells have spread, it is extremely difficult to eradicate those cancer cells permanently. 

A large UK trial ( STAMPEDE trials) found that “Radiotherapy to the prostate did NOT improve overall survival for unselected patients with newly diagnosed metastatic prostate cancer”

So if radiation does not improve survival, why did the oncologists offer radiation therapy to Biden?

Full medical details are not available and so it is difficult to give a definitive answer in Biden’s case.

There are few possibilities.

In the above mentioned STAMPEDE trial , in a smaller select group of patients, Radiation therapy did improve overall survival in men with a low metastatic burden. ( ie fewer cells have spread).

One can only speculate whether that’s been the case with regards to Mr Biden.

References

  1. CNN. Biden starts radiation therapy for aggressive form of prostate cancer. By Kevin Liptak, Fadel Allassa. UPDATED OCT 11, 2025, 11:28 AM PUBLISHED OCT 11, 2025, 10:01 AM
  2. BBC news. Biden receiving radiation therapy for prostate cancer. By Jaroslav Lukiv. Published 11 October 2025.
  3. Lancet. Stampede trial. Radiotherapy to the primary tumour for newly diagnosed, metastatic prostate cancer (STAMPEDE): a randomised controlled phase 3 trial.

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