PDPN and glioblastoma: Furthermore, based on the operative specimens from five GBM patients (MGH26, MGH28, MGH29, MGH30, and MGH31), we identified significantly strong positive correlations between PDPN and DNA repair (R = 0.41, p < 0.01), invasion (R = 0.33, p < 0.01), stemness (R = 0.32, p < 0.01), metastasis (R = 0.33, p < 0.05).