Plate Nº 84 · recorded October 10, 2026
Health & Medicine ResearchReported finding
Focused Brain Radiation Eases Severe Depression in Small Trial
In a 20-patient trial, 89% of patients with treatment-resistant depression improved after incision-free brain radiation. Symptom scores dropped 53% on average and benefits lasted a median of three years.
By Priya Raman3 min read542 words
In brief
- 89% of 20 participants with severe, treatment-resistant depression improved after stereotactic radiosurgical capsulotomy.
- Suicidal thoughts receded in 13 of 14 participants who had experienced them before treatment.
- Symptom scores fell 53% on average among the 18 patients assessed after the procedure.
- Benefits appeared to last a median of three years, according to the 2026 study.
- About 30% of people with depression do not respond to at least two antidepressant treatments.
A small clinical trial of 20 patients with severe, hard-to-treat depression found that 89% of participants showed improvement after receiving focused, incision-free brain radiation, researchers reported at the American Society for Radiation Oncology (ASTRO) annual meeting in Boston.
The procedure, called stereotactic radiosurgical capsulotomy, uses focused radiation beams to create a tiny lesion in a brain circuit involved in mood and obsessive-compulsive disorders. It requires no cutting, no skull opening, and no implanted electrodes.
What did the trial find?
Of the 20 participants, 14 had depression severe enough to cause suicidal thoughts. After treatment, those thoughts receded in all but one of those patients, according to lead author Dr. Mohamed Khattab, a radiation oncologist at the University of South Florida and Tampa General Hospital.
Eighteen of the 20 patients completed follow-up depression assessments. Their symptom scores dropped by an average of 53% on a standard test. Benefits appeared to last a median of three years, meaning half of participants maintained gains for longer periods and half did not.
Ten participants also had obsessive-compulsive disorder (OCD), a condition involving intrusive thoughts and repetitive behaviors, alongside their depression.
How does the technique work?
Stereotactic radiosurgery already treats certain cancers and OCD. Its use against treatment-resistant depression is new.
Doctors aim converging beams of radiation at a small target deep in the brain. The beams form a precise lesion that disrupts an overactive mood circuit while sparing nearby tissue.
The Florida team first tested the approach in three patients in 2022 with encouraging results.
What about side effects?
The procedure caused few notable problems:
- Three participants developed mild headache or dizziness.
- Two showed larger-than-expected tissue changes, resolved after steroid treatment.
- None showed cognitive decline, neurological deficits, apathy, or personality changes.
"The preservation of cognitive function was one of the most important findings," Khattab said. "People understandably worry about whether a procedure involving the brain could change how they think or function."
What are the limits of this study?
The trial enrolled only 20 patients and lacked a comparison group receiving either no treatment or a sham procedure. Without that control, researchers cannot link the symptom improvements to the radiation with certainty.
Findings presented at medical meetings are preliminary until they appear in a peer-reviewed journal. This study was published in the International Journal of Radiation OncologyBiologyPhysics.
Participants had already tried multiple other treatments, including cognitive therapy, several medications, ketamine, transcranial magnetic stimulation, electroconvulsive ("shock") therapy, and invasive brain procedures such as ablation.
Why does this matter?
About 30% of people with depression do not respond to at least two antidepressant treatments, a category known as treatment-resistant depression.
Existing brain-targeted options, including electroconvulsive therapy and surgical ablation, can carry significant side effects.
Dr. Markus Bredel, co-chair of ASTRO's Functional Radiation Medicine Task Force and a professor of radiation oncology at the University of Miami Sylvester Comprehensive Cancer Center, called the work valuable but cautioned that broader trials are needed.
"This study evaluates a highly targeted, incisionless approach in patients who had already tried multiple therapies, while also tracking cognition and safety over time," Bredel said. He added that larger studies must come before this approach becomes part of routine care.
via Medical Xpress (Source)
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Senior reporter covering industry trends and analytics at SciBeat.
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