The percentages of the SNA-binding fraction in total IgG for the different groups were as follows: 9.23 ± 5.63% (for 5 healthy blood donors), 10.06 ± 2.39% (for 10 patients with anti-MPO antibodies), 8.53 ± 2.49% (for 6 patients with both anti-GBM antibodies and anti-MPO antibodies), 11.60 ± 5.95% (for 6 patients with anti-GBM antibodies and without anti-MPO antibodies) and 10.38 ± 6.11% (for 5 patients with anti-PR3 antibodies). This evidence concerns the gene MPO and glioblastoma.