ET-12 * PHASE II STUDY OF ONARTUZUMAB PLUS BEVACIZUMAB VERSUS PLACEBO PLUS BEVACIZUMAB IN PATIENTS WITH RECURRENT GLIOBLASTOMA
Bibliographic record
Abstract
BACKGROUND: Glioblastomas are highly vascularized with elevated VEGF expression and have been shown to respond to the anti-VEGF antibody bevacizumab. High MET expression has been associated with shorter progression-free survival (PFS) in glioblastomas (Pierscianek, et al. Brain Pathol 2013). This phase II study investigated the monovalent MET inhibitor, onartuzumab, plus bevacizumab (Ona + Bev) versus placebo plus bevacizumab (Pl + Bev) in recurrent glioblastoma. METHODS: Bevacizumab-naïve patients with glioblastoma at first recurrence following chemoradiation were randomized 1:1 to receive Ona (15mg/kg, q3w) + Bev (15mg/kg, q3w) or Pl + Bev until disease progression. Enrollment onto a third arm, Ona + Pl, was put on hold during assessment of safety data and was subsequently closed due to study conduct concerns (data not presented). Primary endpoint: PFS by RANO criteria (ITT and MET biomarker-positive subpopulations). Secondary endpoints: overall survival, objective response rate, duration of response, and safety. RESULTS: In the 129 patients enrolled (Ona + Bev n = 64, Pl + Bev n = 65) baseline characteristics were balanced; median age was 57 years; 43.4% had Karnofsky performance status 90-100%; 87.6% had measurable disease at baseline. Median number of bevacizumab cycles: 5 for Ona + Bev, 6 for Pl + Bev; median onartuzumab cycles, 4; median placebo cycles, 6. Grade ≥3 adverse events (AEs) were reported in 38.5% of Ona + Bev and 35.9% of Pl + Bev patients; serious AEs were reported in 30.8% and 29.7%, respectively. Grade 5 AEs: Ona + Bev n = 2 intestinal perforation; Pl + Bev n = 1 intracranial hemorrhage. AEs leading to study drug withdrawal were seen in 10.8% of Ona + Bev and 6.3% of Pl + Bev patients. AEs (all grades) with a difference in incidence of ≥10% between arms included peripheral edema (44.6% Ona + Bev, 14.1% Pl + Bev), hypertension (12.3% Ona + Bev, 32.8% Pl + Bev) and hypoalbuminemia (12.3% Ona + Bev, 1.6% Pl + Bev). Efficacy data are pending. CONCLUSION: The AEs observed were consistent with previous safety profiles for onartuzumab and bevacizumab with no new safety signals. Efficacy data will be presented.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".