Langerhans Cell Histiocytosis Associated with Oral Cancer. A Case Report of Unusual Association
Bibliographic record
Abstract
Langerhans cell histiocytosis (LCH) is rare, particularly the adult onset. The disease can present with wide-spectrum manifestations, ranging from an isolated lesion to life threatening multisystem involvement. The association of LCH with neoplastic conditions is documented in the literature. However, the co-occurrence of LCH and oral squamous cell carcinoma (SCC) is highly unusual and raises questions about the shared nature of both diseases. Herein, we present a rare case of an unusual co-occurrence of LCH and oral SCC. The patient, who has a long-standing history of smoking, underwent an excision for SCC. Microscopic examination revealed invasive well-differentiated SCC and an adjacent distinct nodule with morphological features and immunohistochemistry expression consistent with LCH. Most adult-onset LCH presents with multisystem involvement at diagnosis, and lesions in the oral cavity may precede evidence of LCH elsewhere. Although Somatic mutations have been identified as having a key role in the pathogenesis, a reactive process is not entirely excluded. Adult-onset isolated LCH lesions should prompt clinicians to look not only for multisystem involvement but also for association with other malignant neoplasia. In addition, the association of oral SCC with LCH raises the possibility of smoking-related pathogenesis.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.003 | 0.002 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.004 | 0.002 |
| Insufficient payload (model declined to judge) | 0.002 | 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".