Department of Internal Medicine, Seoul National University Hospital, Seoul, South Korea
Yongjun Cha , Yu Jung Kim , Tae Min Kim , Seung Hong Choi , Se-Hoon Lee , Dong-Wan Kim , Chul-Kee Park , Il Han Kim , Jee Hyun Kim , Eunhee Kim , Byung Se Choi , Chae-yong Kim , In Ah Kim , Dae Seog Heo
Background: Bevacizumab (Bev) and irinotecan combination therapy is effective against recurrent malignant glioma. However, post-Bev treatment and its clinical outcomes are not well investigated. Methods: We identified 103 consecutive recurrent malignant glioma patients who received Bev plus irinotecan at our institutions.Clinical records and magnetic resonance images were reviewed. Response and progression were assessed by RANO criteria. Results: Bev and irinotecan treatment produced response rate of 37.9% (95% CI, 29.1-47.5%). At a median follow-up time of 41 weeks, the median progression-free survival (PFS) was 17.1 weeks (95% CI, 14.3-20.0), and 6-month PFS (6M-PFS) was 27.8% (95% CI, 18.4-37.2). The median overall survival (OS) was 33.4 weeks (95% CI, 27.8-39.1). Response predicted for superior PFS (25.0 weeks vs. 11.0 weeks, p < .001) and OS (45.9 weeks vs. 26.7 weeks, p < .001). A total of 93 patients discontinued Bev treatment and the reasons for discontinuation were: disease progression in 59 (63.4%), toxicities in 4 (4.3%), physician’s decision in 5 (5.4%), patient’s refusal to further treatment in 25 (26.9%). The median OS was 26.7 weeks in 59 patients who discontinued Bev due to disease progression, and 45.7 weeks in 34 patients who discontinued Bev for reasons other than disease progression (p < .001). Among 85 patients who progressed after Bev, 42 (49.4%) received further therapy: chemotherapy in 32 (37.6%), radiotherapy in 9 (10.6%), and surgery in 1 (1.2%). Further chemotherapy regimens included temozolomide (31.2%), ACNU/CDDP (25.0%), Bev reintroduction (18.8%), erlotinib (12.5%), PCV (9.4%), and intrathecal methotrexate (3.1%). The median survival time after Bev failure was 15.6 weeks (95% CI, 13.3-17.8). Patients who received further therapy showed longer median OS (18.6 weeks vs. 12.9 weeks, p < .001). In patients who received chemotherapy, the median PFS and OS was 6.6 weeks and 20.6 weeks, respectively. Conclusions: Prognosis after Bev failure was poor. Proper selection of patients who may benefit from further treatment is warranted.
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