Schedule- and dose-dependency of CPX-351, a synergistic fixed ratio cytarabine:daunorubicin formulation, in consolidation treatment against human leukemia xenografts
Bibliographic record
Abstract
CPX-351, a liposomal formulation co-encapsulating cytarabine (Cyt) and daunorubicin (Daun), has been developed, which delivers synergistic Cyt:Daun molar ratios to bone marrow. CPX-351 has demonstrated markedly superior anti-leukemic activity over free Cyt:Daun drug cocktails in preclinical models. Given the prolonged plasma lifetime of CPX-351, we examined the relationship between therapeutic efficacy and the frequency of treatment in the consolidation setting using a bone marrow-engrafting human leukemia xenograft model. Adding a day 1,3,5 consolidation treatment course for CPX-351 therapy improved the increase in lifespan (ILS) from 116% and no cures for a single induction course, to 268% plus a 33% cure rate for an induction plus consolidation course. In contrast, free Cyt:Daun cocktail treatment provided much lower ILS values with no cures. Administering CPX-351 as consolidation therapy starting on day 42 using a day 1,3, day 1,5, or day 1,7 schedule yielded ILS values of 154%, 185%, and 108%, respectively. The increased efficacy observed for the day 1,3 and day 1,5 consolidation schedules was associated with elevated bone marrow drug accumulation for the second doses. The enhanced efficacy obtained for intermediate dosing frequency in the consolidation setting suggests that the anti-leukemic activity of synergistic drug ratios is dependent on both duration of exposure and maintenance above a therapeutic threshold.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| 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".