How focused radiation works for colon cancer that has spread to the brain
Original title: Clinical outcomes of patients with brain metastases from colorectal cancer treated with stereotactic radiosurgery.
How far along is this research?
- Lab cells
- Animals
- Review
- Tested in people
This was tested in people. That is the most reliable kind of research we share.
Focused radiation is a treatment doctors already offer today.
The short version
Focused radiation did not control brain tumors from colon cancer as well as it does for some other cancers.
What was studied. Doctors looked back at the records of 110 people with colon or rectal cancer that had spread to the brain. They had 207 brain tumors in all, and all were treated with focused radiation between 1989 and 2021.
What they found. The treated tumor came back or grew in 9.7% of cases by 3 months, 22% by 6 months, and 25% by 12 months. Of the people treated, 81% were alive at 3 months, 49% at 6 months, and 24% at 12 months. Older age was linked to the tumor coming back, but tumor size and radiation dose were not.
What this means, and what it doesn't
What it could mean: If you have colon cancer that has spread to the brain, focused radiation is still a treatment doctors use. But these tumors may be harder to control with radiation than tumors from some other cancers. You could ask your care team what this means for your own plan.
What it doesn't mean: This does not mean focused radiation will not work for you. The study looked back at past records from one hospital. It did not test anything new. It cannot tell you how any one person will do. It is not a new treatment, and it is not a cure.
Source: PubMed, May 26, 2026 · Read the original
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