Intratumoral methotrexate kinetics in a patient with intracranial anaplastic ependymoma
Bibliographic record
Abstract
Little is known about intratumoral anticancer drug concentration in childhood brain tumors. We were able to measure methotrexate (MTX) tumor concentrations directly in a cystic anaplastic ependymoma. Cyst fluid was obtained by puncture of a subgaleal Rickham reservoir connected to a catheter in the tumor cyst. MTX concentrations were determined by fluorescence polarization immunoassay and compared to serum concentrations. Maximum MTX concentrations in tumor and CSF were found at the end of MTX infusion. Twenty-four hour after MTX infusion the mean tumor concentration was significantly higher than in the serum indicating MTX retention and accumulation in the tumor cyst. An AUC(tumor)/AUC(serum) ratio of 1.95 was obtained. In response to the applied multiagent chemotherapy the clinical condition of our patient improved and the tumor showed partial response on MRI. Cystic ependymomas might benefit from high dose MTX especially because of drug retention in the tumor cyst.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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 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".