IGHG3 and glioblastoma: A renal pathology of 60 patients with atypical anti-GBM disease revealed that all patients exhibited visible linear deposits of IgG along GBM, with IgG1 being the predominant subclass (45.8%), followed by IgG2 (35.6%), IgG4 (18.6%) and IgG3 (11.9%) [3].