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BACKGROUND TTFields combined with TMZ chemotherapy demonstrated significantly improved PFS, OS and long-term survival in newly diagnosed glioblastoma (ndGBM) patients in the EF-14 trial; independent of MGMT-promoter methylation-status, age, grade of resection, and performance status. Recently, improved efficacy of lomustine/TMZ compared to TMZ monotherapy in ndGBM patients with MGMT-promotor methylation was reported in the CeTeG trial. As TTFields demonstrated a favorable safety profile as well as a high potential for being combined with other modalities and the encouraging results for methylated MGMT-promoter GBM patients in the CeTeG trial, there is a strong rationale for combining these treatment regimens. Here, we present a case series of patients receiving a combination of TTFields and lomustine/TMZ. METHODS Patients with ndGBM and MGMT-promoter methylation underwent combined therapy of TTFields plus lomustine/TMZ after surgery and radiochemotherapy. MGMT-promoter status was measured by pyrosequencing. Safety, feasibility, and first efficacy results are reported at data cut-off (April 26, 2019). RESULTS Sixteen patients with MGMT-promoter methylated ndGBM (median, range: age 50, 27–70; KPS 90, 60–100) have been treated with a combination of TTFields plus lomustine/TMZ. The analysis included patients with complete resection (n=7), partial resection (n=8), as well as biopsy (n=1). CTCAE grade 3 hematotoxicity was observed in seven patients (44%) but was unlikely related to the addition of TTFields to lomustine/TMZ. Medical device site reactions (low-grade skin reactions) were detected in six patients (38%). At data cut-off, the analyzed patient population demonstrated a median PFS of 20 months; the median OS was not yet reached. CONCLUSION The results of this analysis indicate that the combination of TTFields/lomustine/TMZ is safe and feasible. Moreover, the observed survival outcomes point to preliminary beneficial effects of the triple combination. Additional follow-up and increased sample size are required and planned for further safety and efficacy assessment of this treatment regimen.

neuro-oncology

RARE-39. COMBINATION OF TUMOR TREATING FIELDS (TTFIELDS) WITH LOMUSTINE (CCNU) AND TEMOZOLOMIDE (TMZ) IN NEWLY DIAGNOSED GLIOBLASTOMA (GBM) PATIENTS - A BI-CENTRIC ANALYSIS