Orphanet Journal of Rare Diseases | Evaluation of GED-C Point Scoring System for Early Diagnosis of Gaucher Disease in Korea

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This study is the first to evaluate the applicability of the Gaucher Earlier Diagnosis Consensus Point Scoring System (GED-C PSS) in the Korean population, confirming its high sensitivity and specificity in children and young adults. The system helps non-specialist physicians enhance diagnostic awareness of Gaucher disease, facilitating early recognition and intervention.

 

Literature Overview
The article titled 'The Gaucher Earlier Diagnosis Consensus point-scoring system (GED-C PSS) for children and young adults: a retrospective and prospective evaluation in Korea', published in Orphanet Journal of Rare Diseases, reviews and summarizes the evaluation of the GED-C PSS as an early diagnostic tool for Gaucher disease (GD) in Korea. It demonstrates the diagnostic value of the scoring system in clinical practice, particularly in pediatric and young adult patients, supporting its potential as an early screening tool. The study data indicate that the scoring system has high sensitivity and specificity, which can aid in improving the early diagnosis rate of Gaucher disease.

Background Knowledge
Gaucher disease (GD) is an autosomal recessive lysosomal storage disorder caused by deficient activity of β-glucocerebrosidase encoded by the GBA1 gene. This deficiency leads to the accumulation of glucosylceramide in macrophages, forming the characteristic Gaucher cells. The disease mainly presents with hepatosplenomegaly, anemia, thrombocytopenia, bone disease, and some subtypes involve neurological involvement. Over 400 GBA1 pathogenic variants have been identified globally, and the clinical manifestations vary significantly across phenotypes (Types 1–3). Early diagnosis is crucial for delaying disease progression and optimizing treatment, but due to its rarity and non-specific symptoms, GD is often misdiagnosed or diagnosed with delay. Korea is a low-incidence region for GD, and previous registry data indicate a very low annual incidence, with newborn screening not yet widely implemented. This study evaluates the performance of GED-C PSS in the Korean population to optimize screening thresholds and validate its diagnostic performance in clinical practice, providing empirical support for improving early detection of Gaucher disease.

 

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Research Methods and Experiments
This study combines retrospective and prospective approaches, recruiting patients meeting the GED-C PSS criteria from 13 hospitals and 14 centers in Korea. Blood samples were collected and PSS scores analyzed. A total of 513 participants were enrolled, including 162 retrospectively and 351 prospectively. The PSS scoring system assigns points based on symptoms and covariates (3 points, 2 points, 1 point, 0.5 points), with a total score ≥ 2 qualifying for enrollment. ROC curve analysis was used to determine the optimal diagnostic threshold, and the Youden index was calculated to assess sensitivity and specificity.

Key Findings and Perspectives

• ROC analysis showed that GED-C PSS had an AUC of 0.9883 (95% CI: 0.9677–1), with a sensitivity of 1.0 and specificity of 0.97 when the diagnostic threshold was set at 6.5, indicating excellent diagnostic discrimination in the Korean population.
• Two GD patients were successfully diagnosed during the prospective enrollment phase, with PSS scores of 6.5 and 11.5, significantly higher than those of non-GD patients, demonstrating the system’s capability to identify GD in real clinical settings.
• The study also found that Korean GD patients exhibited symptom combinations similar to those in Western populations, such as splenomegaly, thrombocytopenia, and hepatomegaly. However, covariates like family history and Ashkenazi Jewish ancestry were not observed in Korean patients, suggesting that PSS scoring should be adapted according to regional population characteristics.

Significance and Future Directions
This study is the first prospective evaluation of GED-C PSS in the Korean population, supporting its high clinical applicability in pediatric and young adult settings. Future work could integrate the system with electronic health records to further optimize automated assessment and improve early recognition efficiency. Additionally, the study emphasizes the importance of actively using scoring systems in regions without newborn screening to identify potential cases and reduce diagnostic delays.

 

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Conclusion
Gaucher disease is a rare but treatable lysosomal storage disorder, and early diagnosis is vital for improving patient outcomes. This study validates the diagnostic performance of GED-C PSS in the Korean population, showing high sensitivity and specificity in children and young adults. The findings support the broader application of the scoring system in clinical practice, especially in non-specialist clinics and primary healthcare settings, to enhance early detection rates. Although the number of confirmed cases is small, the study provides a reliable PSS threshold through ROC analysis, laying the theoretical foundation for future large-scale screening and integration with electronic health records. This work provides preliminary evidence for the application of Gaucher disease early diagnostic tools in Asian populations, and further large-scale multicenter studies are needed to confirm its generalizability.

 

Seung Min Hahn, Minseok Kim, Youna Kim, Chung Mo Nam, and Chuhl Joo Lyu. The Gaucher Earlier Diagnosis Consensus point-scoring system for children and young adults: a retrospective and prospective evaluation in Korea. Orphanet Journal of Rare Diseases.