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In a small, single-center study, suicidal ideation resolved at last follow-up in 13 of 14 patients with treatment-resistant depression who had suicidal thoughts at the start. Depression scores also fell among evaluable patients, but the study had no sham control and does not establish that radiosurgery caused the improvements or that the procedure is ready for routine care.
A small clinical study found that suicidal ideation had resolved at last follow-up in 13 of 14 patients with treatment-resistant depression who reported suicidal thoughts before receiving radiosurgical capsulotomy, a targeted, incisionless brain procedure. The findings, presented by Mohamed Khattab, MD, at an American Society for Radiation Oncology meeting, are early evidence from one medical center—not proof that the treatment caused the changes or that it should be used as standard care.
The study enrolled 20 people with longstanding treatment-resistant depression; 18 had evaluable depression symptom scores. Their average Beck Depression Inventory (BDI) score was 32.4 before treatment, on a scale from 0 to 63. It was 18.2 at three months, and averaged 15.5 among the 13 patients followed for more than a year. Eleven patients had a decrease of at least 50% in their individual BDI score. The report said all but two of the 20 enrollees had some improvement from baseline.
These figures refer to different groups and follow-up points: 13 of 14 patients with suicidal ideation had resolution at last follow-up, while BDI results were available for 18 patients and the longer-term average came from 13. The study followed participants for as long as 35 months. Half of the enrolled patients also had obsessive-compulsive disorder (OCD); among those 10 patients, the average Yale-Brown Obsessive Compulsive Scale score fell from 30.0 before treatment to 17.7 at three months.
Khattab, who presented the results, said investigators observed no neurologic deficits, cognitive decline, personality changes, hemorrhage or infection after treatment. Cognitive testing used the Montreal Cognitive Assessment. The group’s average score was 26.3 at baseline and ranged from 27 to 29 in assessments at 12 months and later. These observations describe this small study and cannot rule out uncommon or longer-term risks.
Potential for Severe Depression Care
The results draw attention to a possible option for people whose depression has persisted despite multiple treatments. In this study, patients had long histories of illness, averaging 33 years of symptoms. Seven had not responded to transcranial magnetic stimulation, 12 to electroconvulsive therapy and eight to ketamine; these groups may overlap. A procedure that could reduce severe symptoms would matter to patients and clinicians facing limited relief from existing approaches.
But the reported improvements do not establish that capsulotomy is effective or safe for a wider population. Without a sham-controlled comparison, researchers cannot separate a treatment effect from other influences, including changes over time or additional care. The results support further study, not a conclusion that the procedure prevents suicide or is a proven treatment for suicidal ideation.
ASTRO expert Markus Bredel, MD, PhD, of the University of Miami Sylvester Comprehensive Cancer Center, described the reduction in suicidal ideation as striking but said the evidence came from a specialized multidisciplinary program. He said larger studies are needed before the approach can be understood as part of routine care.
brain radiosurgery capsulotomy device
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How Capsulotomy Reached This Trial
Capsulotomy is a procedure that targets a brain pathway involved in mood and obsessive-compulsive behavior. Earlier versions, including surgical and other ablative techniques, have been used for severe psychiatric illness for decades, Khattab said. Stereotactic radiosurgical capsulotomy has been studied mainly for severe, treatment-resistant OCD. It uses focused radiation to target a small area without opening the skull or placing electrodes.
The current study followed an earlier proof-of-principle report involving three patients with treatment-refractory depression. That small report described reduced or resolved suicidal thoughts and no identified cognitive decline or neurologic side effects. The new study expanded the group to 20 patients, all treated at Vanderbilt University Medical Center in Nashville, Tennessee. Khattab said the work was conducted there while he was employed at the institution.
Participants had a median age of 60 and substantial prior treatment histories. The study’s single-center setting means its results reflect one specialized program and should not be assumed to apply to every patient with depression or suicidal thoughts.
“Thirteen of 14 patients with suicidal ideation at presentation — 93% of the patients — had resolution of their suicidal ideation at last follow-up.”
— Mohamed Khattab, MD, the study presenter
Limits of the Patient Evidence
The study was small, conducted at one institution and lacked a sham control. Those limits make it difficult to determine how much of the observed improvement, if any, was caused by radiosurgery. The report does not establish whether outcomes would be similar in a larger, more varied patient group or in settings outside a specialist program.
The follow-up durations varied, and the depression-score averages at later time points came from fewer patients than the initial enrolment. The results also do not settle the procedure’s long-term risks, how it compares with other treatment choices, or which patients might be appropriate candidates. Although investigators reported no cognitive decline or neurologic complications in this group, 20 participants are not enough to assess uncommon harms.
Most importantly, resolution of reported suicidal ideation is not the same as proof of reduced suicide attempts or deaths. The supplied study results do not report those outcomes. The available figures also do not show how participants were selected for the procedure or how concurrent care may have affected symptoms.
Plans for Controlled Follow-Up
Khattab said the research team would like to conduct a randomized, sham-controlled study and incorporate functional imaging. Such a design could better test whether radiosurgery itself accounts for changes in symptoms and help researchers examine how the targeted brain pathway relates to response.
He also said investigators were discussing with psychiatry colleagues how the procedure might fit into the sequence of treatments. No timeline, trial launch date or confirmed next study was provided in the report. Until stronger comparative evidence is available, the results remain an early research finding rather than guidance for clinical use.
Key Questions
What did the study report about suicidal ideation?
Among 14 participants who had suicidal ideation at the start, it had resolved at last follow-up in 13, according to the study presenter. The finding comes from a small study and does not establish that the procedure prevents suicide attempts or deaths.
What is radiosurgical capsulotomy?
It is a stereotactic radiosurgery procedure that targets a small brain area involved in mood and obsessive-compulsive behavior. Khattab said the approach does not require opening the skull or placing electrodes.
How many patients took part?
The study enrolled 20 patients with treatment-resistant depression. Depression scores were evaluable for 18, and 14 participants had suicidal ideation at presentation.
Does this mean the procedure is ready for routine use?
No. The study had a small sample, one center and no sham control. The researchers and an ASTRO expert said larger studies are needed before its role in routine care can be determined.
What research is planned next?
Khattab said the team would like to pursue a randomized, sham-controlled study that also uses functional imaging. The report did not provide a start date or confirm that such a trial has begun.
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