RECURRENT GLIOBLASTOMA MANAGEMENT USING STEREOTACTIC RADIOSURGERY AND SYSTEMIC TREATMENT
Abstract
Glioblastoma multiforme (GBM) is the most common primary malignant tumor of the central nervous system in adults. Dismal survival rates and poor prognosis for recurrent GBM patients still remains a challenging problem. Despite aggressive initial treatment, above 100 % GBM patients have development of recurrent diseases. Management of GBM recurrence is still debatable. The multimodality approaches using combination of stereotactic radiosurgery (SRS), cytostatic agents (Тemozolomide (TMZ)) and antiangiogenic therapy (bevacizumab (BEV)) are often beneficial for such patients and may achieve survival improving.
Aim of research: to assess the efficacy and toxicity of combination therapy approach using stereotactic radiosurgery (SRS) and systemic treatment (chemotherapy and antiangiogenic therapy) in glioblastoma multiforme recurrence treatment.
Materials and methods: at the State Institution “Institute of Neurosurgery named after acad. A.P. Romodanov of NAMS of Ukraine” (Kyiv, Ukraine) 21 patients (pts) with GBM recurrence were treated (8 females and 11 men; median age at time of diagnosis 52.4 (29.7–69.3) from January 2014 till December 2017. The initial surgical treatment as gross total tumor resection was performed in 12 pts (57.1 %), subtotal resection – 5 pts (23.9 %), biopsy – 4 pts (19 %). 12 pts (57.1 %) were MGMT methylated and 9 pts (42.9 %) were MGMT unmethylated. In all cases adjuvant radiation therapy (60 Gy in 30 fractions) were used, 12 pts of them (57.1 %) – in combination with TMZ followed by 6-12 courses of chemotherapy (TMZ) according Stupp protocol. Recurrent disease was treated by SRS followed by TMZ + BEV. SRS was performed by means of “Trilogy” LINAC (“Varian”, USA) with a median dose and fractions of 19.2 Gy (range, 12.0–36.0) in 1 to 5 fractions.
Results: median survival after initial diagnosis was 18.3 months, and 1- and 2-year survival rates of 85.7 % (18 from 21 pts) and 38.1 % (8 from 21 pts) respectively. The median survival from the time of recurrence treatment was 8.3 months. The 6‐ and 12‐months overall survival from SRS were 95.2 % (20 from 21 pts) and 23.8 % (5 from 21 pts), respectively. Adverse radiation effects were noted in 6 (28.6 %) pts and were controlled with corticosteroids. Adverse events grade 1-2 related to the systemic therapy included hematological complications, fatigue, hypertension and proteinuria were observed in 23.8 % (5 from 21 pts) without the occurrence of grade 3 events.
Conclusion: recurrent GBM management using combination of SRS, chemotherapy and antiangiogenic therapy is a promising multimodal treatment approach providing survival improving whereas appropriate toxicity ratio. Further studies of combined treatment of GBM relapse are needed.
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