Additionally, we systematically investigated the functional links between staphylococci and the occurrence, development, diagnosis, and treatment of breast, skin, oral, colon, and other types of cancers, in terms of surface adhesion molecules, α-hemolysin, PVL, SEs, TSST-1, SpA, and SND1, which provides novel insight into the functional relationship between bacterial infections and tumors. This evidence concerns the gene SND1 and bacterial infectious disease.