Magnetic Resonance Imaging-Guided Laser Interstitial Thermal Therapy for Glioblastoma of the Corpus Callosum.

Background: Glioblastoma of the corpus callosum is particularly difficult to treat, as the morbidity of surgical resection generally outweighs the potential survival benefit. Laser interstitial thermal therapy (LITT) is a safe and effective treatment option for difficult to access malignant gliomas of the thalamus and insula.

Objective: To assess the safety and efficacy of LITT for the treatment of glioblastoma of the corpus callosum.

Methods: We performed a multicenter retrospective analysis of prospectively collected data. The primary endpoint was the safety and efficacy of LITT as a treatment for glioblastoma of the corpus callosum. Secondary endpoints included tumor coverage at thermal damage thresholds, median survival, and change in Karnofsky Performance Scale score 1 mo after treatment.

Results: The study included patients with de novo or recurrent glioblastoma of the corpus callosum (n = 15). Mean patient age was 54.7 yr. Mean pretreatment Karnofsky Performance Scale score was 80.7 and there was no significant difference between subgroups. Mean tumor volume was 18.7 cm3. Hemiparesis occurred in 26.6% of patients. Complications were more frequent in patients with tumors >15 cm3 (RR 6.1, P = .009) and were associated with a 32% decrease in survival postLITT. Median progression-free survival, survival postLITT, and overall survival were 3.4, 7.2, and 18.2 mo, respectively.

Conclusion: LITT is a safe and effective treatment for glioblastoma of the corpus callosum and provides survival benefit comparable to subtotal surgical resection with adjuvant chemoradiation. LITT-associated complications are related to tumor volume and can be nearly eliminated by limiting the procedure to tumors of 15 cm3 or less.