PYCARD and ganglioneuroma: Subtype-specific analysis identified 131 differentially expressed genes (DEGs), while 143 DEGs distinguished ANCA-GN from controls.Intersection analysis and machine learning prioritized two hub genes, <i>PYCARD</i> and <i>IFI30</i>, which exhibited strong diagnostic accuracy (AUC >0.9) and correlated with CD8+ T-cell infiltration.