In Figure 6, we observed two isoforms of glutathione peroxidase (GPx), GPx3 and GPx7, interacting with matrix metalloproteinase 14 (MMP14), chemokine chemoattractant 1 (CXCL1) and chemokine chemoattractant 21 (CCL21), tissue inhibitor of metalloproteinases 2 (TIMP2), serpin family B member 9 (SERPINB9), and ankyrin repeat domain 1 (ANKRD1), which have been implicated in tumor progression. The gene discussed is CCL21; the disease is neoplasm.