Confirmed Systemic Mastocytosis in a Pediatric Patient With Widespread Cutaneous Symptoms
Bibliographic record
Abstract
Mastocytosis is characterized by the clonal expansion of mast cells, with deposition into various organs and variable clinical presentation depending on subtype. It generally results from a mutation in the KIT gene, which encodes for production of receptor tyrosine kinases, the constitutive activity of which results in abnormal cell growth and proliferation. In pediatric patients, the cutaneous mastocytosis (CM) form predominates, and systemic mastocytosis (SM) is rarely reported. Accordingly, clinical course and management are not well described. We describe a case of SM in a 10-year-old child who was initially suspected of having widespread CM. The child had initially minimal systemic symptoms that are usually described in SM. Peripheral testing for the most common KIT mutation associated with constitutive activity, c-KIT D816V, in which aspartic acid is substituted for valine at position 816, was negative. Rising serum tryptase and increasing systemic symptoms of histamine release led to bone marrow biopsy, which was positive for the c-KIT D816V mutation and confirmed the diagnosis of indolent SM. The patient's response to treatment is briefly described, with exploration of treatment modalities described in previously reported cases. The case illustrates that, even in the absence of classic systemic symptoms, an index of suspicion for SM should be maintained, and highlights that peripheral testing for the c-KIT D816V mutation may be represent a false negative. Finally, we discuss that although antihistamines have historically formed the backbone of treatment in pediatric SM, the increasing availability of biological agents present possible new treatments with some success reported in the literature.
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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) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.003 | 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".