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Published on: February 14, 2021
Development and clinical application of a histopathology-based pathological scoring system for IgG4-related disease
Huimin Ni1, Yao Xu2, Guoxiang Xu1
1Department of Pathology, The First Affiliated Hospital of Wannan Medical University (Yijishan Hospital of Wannan Medical University), Wuhu, Anhui, 241001, China.
Insights
A new scoring system for IgG4-related disease (IgG4-RD) improves diagnosis by quantifying key pathological features. This quantitative approach enhances accuracy and consistency in identifying IgG4-RD, aiding clinical practice.
Area of Science:
- Pathology
- Immunology
- Rheumatology
Background:
- Diagnosis of IgG4-related disease (IgG4-RD) is challenging due to subjective histopathological interpretation.
- Need for objective and reproducible diagnostic tools in IgG4-RD.
Purpose of the Study:
- To develop and internally evaluate a quantitative pathological scoring system for IgG4-RD.
- To improve the diagnostic accuracy and consistency of IgG4-RD identification.
Main Methods:
- Retrospective review of 96 patients (47 IgG4-RD, 49 non-IgG4-RD) diagnosed between 2012-2024.
- Quantification of eight histopathological parameters including IgG4+ plasma cell counts, fibrosis, and inflammation.
- Development of a weighted scoring system and evaluation using ROC curve analysis.
Main Results:
- All quantified parameters, except lymphoplasmacytic infiltration, showed significant differences between IgG4-RD and non-IgG4-RD groups (P < 0.05).
- A 12-point scoring system achieved high diagnostic accuracy (AUC 0.996), with 95.74% sensitivity and 100% specificity.
- A simplified four-parameter version also demonstrated excellent performance (AUC 0.994).
Conclusions:
- The novel histopathology-based scoring system offers a standardized and reproducible method for IgG4-RD diagnosis.
- This tool enhances objectivity in pathological assessment, complementing existing diagnostic criteria.
- The scoring system is valuable for routine clinical practice in diagnosing IgG4-related disease.
Abstract:
IgG4-related disease (IgG4-RD) diagnosis remains challenging due to subjective histopathological interpretation. This study aimed to develop and internally evaluate a quantitative pathological scoring system to improve diagnostic accuracy. We retrospectively reviewed 96 patients with marked lymphoplasmacytic infiltration diagnosed between 2012 and 2024, classified as IgG4-RD (n = 47) or non-IgG4-RD (n = 49) according to the 2019 ACR/EULAR criteria. Eight histopathological parameters were quantified, including IgG4+/CD138+ ratio, IgG4+ plasma cell count/high-power field, storiform fibrosis, obliterative venulitis, perineural inflammation, tertiary lymphoid structures, nerve bundles, and eosinophilic infiltration. Mann-Whitney U test, ROC curve analyses, subgroup analyses, and calibration curve were performed. A weighted scoring system was constructed based on parameter diagnostic performance. Significant intergroup differences were observed in all parameters except lymphoplasmacytic infiltration (all P < 0.05). The 12-point scoring system (≥5.5-point threshold) demonstrated excellent diagnostic accuracy (AUC 0.996, 95% CI: 0.988-1.000), with 95.74% sensitivity and 100.00% specificity. A simplified four-parameter version achieved an AUC of 0.994 (0.986-1.000), sensitivity 93.62%, and specificity 100.00%. This novel histopathology-based scoring system provides a standardized, reproducible tool for IgG4-RD diagnosis, enhancing objectivity and consistency in pathological assessment, and serves as a valuable complement to existing diagnostic frameworks for routine clinical practice.
