Papaverine Enhances the Oncolytic Effects of Newcastle Disease Virus on Breast Cancer In Vitro and In Vivo

Figure 4

A combination of NDV and papaverine showed an insignificant cytotoxic effect as the monotherapies in the normal cell line which was treated with NDV (0.1, 1, and 2 MOI) and (10, 25, and 50 μm/ml) papaverine, and then the cell viability was measured by the MTT assay (a). (b-c) Illustrations of the dose–effect curve and normalized isobologram of nonconstant combination ratios were measured by the Chou–Talalay method, where the CI value quantitatively defines synergism. (CI < 0.9), additive effect (CI = 0.9–1.1), and antagonism (CI > 1.1). All data shown are the mean ± SEM.

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