Evaluation of the efficacy and tolerability of bevacizumab-based treatments in recurrent primary brain tumors: a multicenter real-world Turkish Oncology Group (TOG) study
Year: 2026
Type: article
Study design: Observational Study
Abstract: BACKGROUND: Bevacizumab is widely used for recurrent high-grade glioma, but the real-world effectiveness of bevacizumab with or without irinotecan remains uncertain. We evaluated outcomes of bevacizumab-based regimens in a large multicenter Turkish cohort. METHODS: In this retrospective study from 30 centers, adults with recurrent glioblastoma or other primary brain tumors treated with a bevacizumab-containing regimen at first or second progression were included. Patients received bevacizumab monotherapy, bevacizumab plus low-dose weekly irinotecan, or bevacizumab plus standard-dose irinotecan every 14 days. Tumor response, progression-free survival (PFS), overall survival (OS), and toxicity were assessed. Prognostic factors were analyzed using Cox regression. RESULTS: A total of 437 patients were included; 78.0% had glioblastoma. Treatment consisted of bevacizumab monotherapy in 9.4%, bevacizumab plus weekly irinotecan in 8.5%, and bevacizumab plus irinotecan every 14 days in 82.2% of patients. The objective response rate was 41.6%, and the disease control rate was 80.1%. Median OS was 10.77, 7.37 and 9.77 months (log-rank p = 0.024), and median PFS was 5.77, 3.93 and 6.43 months (p = 0.005), respectively. On multivariable analysis, glioblastoma histology independently predicted shorter PFS and OS, whereas a higher number of treatment cycles and antiepileptic drug use were associated with longer PFS. For OS, the irinotecan-bevacizumab every-14-day regimen and a higher number of treatment cycles were associated with improved survival compared with bevacizumab monotherapy, while baseline corticosteroid use and discontinuation of bevacizumab-containing therapy were independent adverse prognostic factors. CONCLUSIONS: In this large real-world cohort, bevacizumab-based therapy achieved meaningful disease control and survival in recurrent primary brain tumors. An irinotecan-bevacizumab regimen administered every 14 days was associated with superior OS at the expense of increased but manageable chemotherapy-related toxicity, supporting its use in appropriately selected patients.
Source: BMC Cancer
Authors: Zehra Sucuoğlu İşleyen, Şaban Seçmeler, Abdullah Sakin, Şener Cihan, Mehmet Beşiroğlu, Seda Kahraman, Melek Karakurt Eryılmaz, Esra Zeynelgil, Eda Çalışkan Yıldırım, Engin Kut, Nilay Şengül, Fatma Paksoy Türköz, Özkan Alan, Özlem Özkul, Selver Işık, Feride Yılmaz, Ahmet Gülmez, Sema Türker, Gökhan Karakaya, Meral Günaldı, Leyla Özer, Asude Aksoy, Fatih Karataş, Teoman Sakalar, Derya Demirtaş Esmer, Fatih Teker, Necla Demir, Özgecan Dülgar, Serdar Turhal, Hacı Mehmet Türk, Kayhan Ertürk, Emir Çelik, M. Mustafa Atcı
Institutions: Istanbul Medipol University, Istinye University, Ankara Yıldırım Beyazıt University, Ankara Bilkent City Hospital, Necmettin Erbakan University, Ankara Etlik City Hospital, Dokuz Eylül University, Bahçeşehir University, Istanbul University-Cerrahpaşa, Marmara University, Samsun University, Liv Hospital, Karabük University, Kahramanmaraş Sütçü İmam University, Ümraniye Eğitim ve Araştırma Hastanesi, Bezmiâlem Vakıf Üniversitesi
Language: English
Subfield: Genetics
Field: Medicine
Domain: Health Sciences
Open Access status: gold
Estimated APC paid: $3,390
OpenAlex ID: W7128928754