Fig. 5.

Viability of MDA-MB-435 and ZR-75-1 breast cancer cells exposed for 72 h to PTX–NSP and corresponding amounts of NSP alone. Cell viability was measured by AlamarBlue^® cell proliferation indicator assay. Cells incubated with PBS and media were used as negative control and treatments data was normalized to these values. The results are expressed as mean value with its standard error (mean ± SD) indicated for 5 measurements of 3 independent experiments.