When we investigated the expression levels of Hsp90, Hsp70, and survivin in these cell lines using Western blotting, it was found that the expression of Hsp90 was almost equal between normal and cancer cells, however, survivin was highly expressed in cancer cell lines, and the expression level of Hsp70 was different among these cell lines (Figure 4C). The gene discussed is BIRC5; the disease is cancer.