Cancer Res Treat.  2017 Jan;49(1):129-140. 10.4143/crt.2015.466.

Post-bevacizumab Clinical Outcomes and the Impact of Early Discontinuation of Bevacizumab in Patients with Recurrent Malignant Glioma

Affiliations
  • 1Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea. sehoon.lee119@gmail.com
  • 2Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
  • 3Division of Hematology/Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
  • 4Department of Radiology, Seoul National University Hospital, Seoul, Korea.
  • 5Department of Neurosurgery, Seoul National University Hospital, Seoul, Korea.
  • 6Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea.
  • 7Department of Radiology, Seoul National University Bundang Hospital, Seongnam, Korea.
  • 8Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Korea.
  • 9Department of Radiation Oncology, Seoul National University Bundang Hospital, Seongnam, Korea.

Abstract

PURPOSE
Bevacizumab±irinotecan is effective for treatment of recurrent malignant gliomas. However, the optimal duration of treatment has not been established.
MATERIALS AND METHODS
Ninety-four consecutive patients with recurrent malignant glioma who were treated with bevacizumab at our institutions were identified. Patients who continued bevacizumab until tumor progression were enrolled in a late discontinuation (LD) group, while those who stopped bevacizumab before tumor progression were enrolled in an early discontinuation (ED) group. Landmark analyses were performed at weeks 9, 18, and 26 for comparison of patient survival between the two groups.
RESULTS
Among 89 assessable patients, 62 (69.7%) and 27 (30.3%) patients were categorized as the LD and ED groups, respectively. According to landmark analysis, survival times from weeks 9, 18, and 26 were not significantly different between the two groups in the overall population. However, the LD group showed a trend toward increased survival compared to the ED group among responders. In the ED group, the median time from discontinuation to disease progression was 11.4 weeks, and none of the patients showed a definite rebound phenomenon. Similar median survival times after disease progression were observed between groups (14.4 weeks vs. 15.7 weeks, p=0.251). Of 83 patients, 38 (45.8%) received further therapy at progression, and those who received further therapy showed longer survival in both the LD and ED groups.
CONCLUSION
In recurrent malignant glioma, duration of bevacizumab was not associated with survival time in the overall population. However, ED of bevacizumab in responding patients might be associated with decreased survival.

Keyword

Bevacizumab; Glioma; High-grade glioma; Glioblastoma

MeSH Terms

Bevacizumab*
Disease Progression
Glioblastoma
Glioma*
Humans
Bevacizumab

Figure

  • Fig. 1. Kaplan-Meier curves for overall survival in late discontinuation (LD) and early discontinuation (ED) groups from each landmark (A, week 9; B, week 18; C, week 26). The residual survival times from all three landmarks were not significantly different between the LD and the ED group. p-values were determined by log-rank tests.

  • Fig. 2. Kaplan-Meier curves for overall survival in late discontinuation (LD) and early discontinuation (ED) groups from each landmark among patients with complete response/partial response (A-C) and stable disease (D-F). The residual survival times from all three landmarks were not significantly different between the LD and the ED group. p-values were determined by log-rank tests.

  • Fig. 3. Kaplan-Meier curves for overall survival after bevacizumab failure are shown in late discontinuation (LD) and early discontinuation (ED) groups according to post-bevacizumab treatment. Patients who received salvage therapy showed significantly longer survival times in both groups. p-values were determined by log-rank tests.


Reference

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