Fig. 3. Synergistic effect of small inhibitory RNA (siRNA), interferon beta (IFN-β), and thimerosal to inhibit the growth of human papilloma virus type 18-positive HeLa and C-4I cells. (A) In HeLa cell, the viability decreased the most significantly when Sp-18E6/27 siRNA (5 nM), thimerosal (0.2 mM), and IFN-β (2 mM) were combined. (B) In C-4I cell, the viability decreased the most significantly when Sp-18E6/27 siRNA (5 nM), thimerosal (0.2 mM), and IFN-β (2 mM) were combined. ^*P<0.05.