ROC analyses showed that the AUC values for DJ-1 and GDF15 were below 0.7, with p-values above 0.05, whereas the MFGE8 gene demonstrated an AUC value above 0.7 with a p-value below 0.05, indicating that only MFGE8 has potential diagnostic discriminatory power for tumour diameter in meningioma (Figure 3C,D). Here, GDF15 is linked to meningioma.