GCT-17. EXPLORING NEW THRESHOLDS FOR BETA-HCG IN CENTRAL NERVOUS SYSTEM GERMINOMA
Bibliographic record
Abstract
Abstract BACKGROUND Human chorionic gonadotropin (beta-HCG) levels in serum and cerebrospinal fluid (CSF) are critical in the management of patients with germinoma. The threshold for beta-HCG diagnosis is a topic of debate and differs in Europe, ≤50 IU/L, North America ≤100 IU/L, and ≤200 IU/L in Brazil/Japan. METHODS We conducted a meta-analysis of English-language publications (1990-2023) to assess how beta-HCG cut-off levels impact treatment outcomes. Standard descriptive statistics summarized all data. RESULTS Forty-nine patients with biopsied germinoma were identified. Eighteen had beta-HCG level of 50-100 IU/L (cohort 1), 21 had 100-200 IU/L (cohort 2), and 10 had >200 IU/L (cohort 3). In cohort 1, treatment with chemotherapy plus radiotherapy was administered to 9 patients. Eight of them received radiotherapy like germinoma treatment (≤30Gy), primarily employing whole ventricle irradiation (WVI). Nine patients received radiotherapy alone with total dose 30-59.6Gy. Fifteen patients in cohort 2 received chemotherapy plus radiotherapy. Eight of them received radiotherapy ≤30Gy for different fields [WVI – 4, whole brain (WB) – 3, cerebrospinal irradiation (CSI) – 1). In 7 patients the dose of radiotherapy exceeded 30Gy (local radiotherapy – 4, CSI – 3). Radiotherapy alone was used in 5 patients, chemotherapy alone – 1 patient. In cohort 3, radiotherapy only was primarily used. Six patients received CSI (50-54Gy), one – CSI+WB+local radiotherapy (12.8Gy+27.2Gy+50.6Gy). One patient received combined treatment and 2 patients received chemotherapy alone. Relapses occurred in each cohort. In cohort 1 – 2 metastatic relapses (1 after WVI 24Gy, 1 after radiotherapy >30Gy). Three children from cohort 2, who received chemotherapy plus radiotherapy were diagnosed with relapse (1 after WB 23.4Gy, 2 after radiotherapy >30Gy). In cohort 3 two metastatic relapses were diagnosed – only after chemotherapy. CONCLUSIONS Relapse rates across all beta-HCG level are similar. However, study groups are small and treatment regimens vary, warranting further investigation.
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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 | 0.019 | 0.022 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.004 | 0.013 |
| Bibliometrics | 0.003 | 0.005 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.003 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 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".