The expression of miR-15b and IGF1R was decreased in glioblastoma cell lines. a According to Pearson’s correlation analysis, the expression of IGF1R was inversely associated with the expression of miR-15b (r
2 = −0.886; p < 0.001). b The expression of miR-15b and IGF1R in glioblastoma cell lines including U87, U373, U251, and A172, and NHA cells was detected using qRT-PCR. *p < 0.001 vs normal NHA cells