Stereotactic laser therapy in cerebral gliomas

Area of Science:

• Neurosurgery
• Oncology
• Medical Physics

Background:

• Cerebral tumors pose significant treatment challenges, especially those in functionally critical brain regions.
• Minimally invasive techniques are sought to improve therapeutic outcomes and reduce morbidity.

Purpose of the Study:

• To evaluate the feasibility and preliminary efficacy of stereotactic interstitial laser therapy for cerebral gliomas.
• To characterize laser-tissue interactions and lesion formation in the brain.

Main Methods:

• Utilized a 1.06 micron Nd:YAG laser with an Interstitial Thermo-Therapy (ITT) fiberoptic system for targeted irradiation.
• Conducted experimental rat brain studies to assess laser-tissue effects.
• Treated 5 patients with WHO grade II-III cerebral gliomas in eloquent areas.
• Monitored therapeutic effects using Magnetic Resonance (MR) imaging and Positron Emission Tomography (PET) scans.

Main Results:

• Experimental studies demonstrated central tumor necrosis and sharply demarcated edema at the lesion margins.
• Lesion size was directly correlated with applied energy and exposure duration.
• Pilot patient data revealed irreversible central tumor necrosis and reversible peripheral edema post-treatment.

Conclusions:

• Stereotactic interstitial laser therapy with Nd:YAG laser fibers is a potentially effective method for treating localized cerebral gliomas.
• The technique induces predictable laser-tissue effects, including tumor necrosis.
• Further long-term studies are warranted to establish its role as a supplementary treatment for malignant brain tumors.