Moreover, Lu et al. (Lu et al., 2021) found 5 key genes, namely, Hyaluronan-Mediated Motility Receptor (HMMR), Cyclin B1(CCNB1), C-X-C motif chemokine ligand 8 (CXCL8), mitotic arrest deficient 2 like 1 (MAD2L1), and Cyclin A2 (CCNA2), in GC patients with poor prognosis using the datasets from GEO database. This evidence concerns the gene CCNA2 and gastric cancer.