The expression association between TGFBI and miR-21 was shown to be significant with a P value of lower than 0.05 either in the NCI-60 cells (Figure 6C) or in 6 brain cancer cell lines (including SF-268, SF-295, SF-539, SNB-19, SNB-75 and U251 cell lines, Figure 6D). The gene discussed is TGFBI; the disease is brain cancer.