Fig. 4

A long-term inhibitory effect of PSS and PL treatments on 4 breast cancer cell lines tested by colony formation assay. Cisplatin was used as a positive control. A After 72-h treatment and further cell cultivation for 21 days, BC colonies were formed. The percentage of survival cells were calculated and plotted as shown in graph B MCF7, C T47D, D MDA-MB-231, and E MDA-MB-468 cell line. Data represented as mean ± SE; ^*, ^**, ^***, ^**** represented P ≤ 0.05, P ≤ 0.01, P ≤ 0.001, and P ≤ 0.0001 from statistical analysis using Unpaired t-test compared between the untreated cells among the same group