The embryotoxic properties of letrozole hold a promise in the treatment of ectopic pregnancy: a systematic review and metanalysis of the literature
Bibliographic record
Abstract
Ectopic pregnancy (EP) represents a severe risk to the health of pregnant women. Recently, the aromatase inhibitor letrozole has been explored as a potential novel treatment for managing EP. The aim of the present metanalysis is to pool the current data regarding the potential contribution of letrozole in treating EP, compared to methotrexate (MTX), in terms of serum beta-human chorionic gonadotropin (β-hCG) reduction. A systematic search of the relevant literature published in PubMed, Science direct and Google Scholar was conducted. Original studies that directly compared letrozole with methotrexate (MTX) for the treatment of ectopic pregnancy (EP) were selected. Articles not written in English, those without a control group, or those whose control group did not involve pharmacological treatment with MTX were excluded. The Newcastle-Ottawa Scale instrument was used in order to assess the quality of non-randomized studies, while the quality of randomized-controlled trials (RCTs) was assessed in accordance with the Cochrane Risk Assessment Tool. The raw mean difference (MD) is used as outcome measure and the summary estimates along with the corresponding 95% confidence intervals (CI) by using a random effects model were calculated. Six studies have been included in the present metanalysis. A total of 373 women diagnosed with EP have been analyzed, 166 of them were treated with letrozole, while 207 women received MTX. The overall result indicates a faster and significant decrement of β-hCG levels in the letrozole group (MD -98.68; 95% CI [-162.38 -34.99], p-value = 0.0024; high heterogeneity I 2 = 95.95%, Q = 105.84, p-value < 0.0001), in comparison to MTX. The present data suggest that letrozole may represent a promising novel treatment for EP. However, the differences in study designs, small sample sizes, and the lack of comprehensive information regarding the short- and long-term safety of letrozole administered to patients with EP underscore the need for further research.
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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 | 0.001 |
| 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".