Phase 1b extension study of cancer stemness inhibitor BB608 (napabucasin) administered in combination with FOLFIRI +/- bevacizumab (Bev) in patients (pts) with advanced colorectal cancer (CRC).
Bibliographic record
Abstract
3564 Background: BB608 (aka Napabucasin, BBI-608) is an oral first-in-class cancer stemness inhibitor targeting Stat3-driven gene transcription. Anti-tumor activity was observed in vitro and in vivo. BB608 showed safety and encouraging signs of anti-cancer activity in phase I/II studies. Methods: A phase Ib extension multi-center study in pts with advanced CRC was undertaken to confirm the RP2D and signs of anti-cancer activity of BB608 in combination with FOLFIRI +/- Bev. BB608 was administered continuously at 240 mg BID in combination with FOLFIRI (5-FU 400 mg/m2 bolus with 2400 mg/m2, irinotecan 180 mg/m2, and leucovorin 400 mg/m2 infusion) +/- Bev 5 mg/kg, administered bi-weekly until disease progression, unacceptable toxicity, or other discontinuation criterion. Results: 46 pretreated CRC pts who had failed an average of > 2 prior lines of therapy were enrolled; including 20 pts (43.5%) previously progressed on FOLFIRI +/- Bev. Of the 46 pts, 14 received FOLFIRI and 32 FOLFIRI with Bev in combination with BB608. There was no dose-limiting or unexpected toxicity or significant pharmacokinetic interactions. Most common adverse events (AEs) included grade 1/2 diarrhea, nausea, vomiting and fatigue. Grade 3 AEs observed in 15 pts included diarrhea (9), fatigue (3), dehydration/hyponatremia (1), hypokalemia (1) and burning in rectum (1) resolved with dose reduction and/or supportive care. Disease control (PR+SD) was observed in 37 of 40 evaluable pts (93%), with partial response (PR) in 11 pts (28%) (RECIST 1.1 30-65% regression), and stable disease with tumor regression in 21 pts (53%). Among 19 pts who had progressed on FOLFIRI +/- Bev previously and were evaluable for tumor assessment, disease control (PR+SD) was observed in 17 pts (90%), tumor regression was observed in 15 pts (80%) of which 6 pts achieved PR (32%). Conclusions: This phase Ib extension study confirmed that BB608 can be safely combined with FOLFIRI +/- Bev, and shows encouraging signs of anti-tumor activity in CRC pts, including pts who had previously progressed on FOLFIRI +/- Bev. Clinical trial information: NCT02024607.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".