In contrast, in the BD dataset, the expression levels of hub genes were generally decreased compared with the normal group, among which the statistically significant hub genes were ACTB, ASPM, AURKA, BRCA1, BUB1, CCNA2, CCNB1, CENPE, MCM4, PCNA, RFC4, and RHOA (Fig. 7B). The gene discussed is CCNA2; the disease is Behcet disease.