Erythropoietic Protoporphyria: Spectrum of Three Cases
Bibliographic record
Abstract
Background: Erythropoietic protoporphyria is a rare photodermatosis of childhood, and the diagnosis can be delayed. A deficient ferrochelatase enzyme leads to accumulation of protoporphyrins in the dermis, causing phototoxic burning. Objective: To report three cases with great variability in severity of symptoms and age at diagnosis. We discuss clinical and biochemical findings, mutation analysis, and therapeutic options. Methods: We report three cases with different degrees of photosensitivity, laboratory results, psychosocial impact, and preventive and therapeutic treatments. Results: The diagnosis of erythropoietic protoporphyria was confirmed by both typical elevation of plasma porphyrins and the discovery of a mutated FECH gene. Conclusion: Erythropoietic protoporphyria should be suspected in any cases of childhood photosensitivity. Systemic complications are unusual. Mutation analysis confirms the diagnosis. Photoprotection is the cornerstone of treatment. Renseignements de base: La protoporphyrie érythropoïétique est une photodermatose infantile rare, et le diagnostic peut être retardé. Une déficience de l'enzyme ferrochélatase produit une accumulation de protoporphyrines dans le derme ce qui provoque une réaction phototoxique. Objectif: Présenter trois cas qui illustrent une grande variabilité de la gravité des symptômes et de l'âge au moment du diagnostic. Nous discutons des résultats cliniques et biochimiques, de l'analyse des mutations, et des options thérapeutiques. Méthodes: Nous exposons trois cas qui présentent différents degrés de photosensibilité, les résultats d'examen de laboratoire, l'impact psychosocial, et les traitements préventifs et thérapeutiques. Résultats: Le diagnostic de la protoporphyrie érythropoïétique a été confirmé à la fois par l'élévation caractéristique des porphyrines plasmatiques et par la mise en évidence d'une mutation du gène FECH. Conclusion: La protoporphyrie érythropoïétique doit être soupçonnée dans tous les cas de photosensibilité infantile. Les complications systémiques sont inhabituelles. L'analyse des mutations confirme le diagnostic. La photoprotection est la pierre angulaire du traitement.
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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 | 0.003 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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".