C3 and glioblastoma: However, the C3 level was higher in the anti-GBM + MN group (1.52 ± 0.24 g/L) than in the anti-GBM + ANCA group (1.01 ± 0.31 g/L, p = .004) and the anti-GBM disease group (1.16 ± 0.19 g/L, p = .023).