Though there were only four normal samples in GSE43290, the efficacy evaluation results still showed that five genes, including AHCYL2 (AUC = 0.729), FGL2 (AUC = 0.782), ID3 (AUC = 0.926), KCNMA1 (AUC = 0.745), and NMNAT2 (AUC = 0.851), could significantly distinguish meningiomas and normal samples (Figure 7(b)). Here, FGL2 is linked to meningioma.