COL6A1 and glioblastoma: In this study, COL1A1, COL1A2, COL3A1, and COL5A1 expression levels were correlated with all three LOXs in GBM, whereas COL6A1-3 expression levels correlated with LOXL1 and LOXL3 in LGG, and with all three LOXs in GBM.