Results: Significant (P<0.01) or very significant (P<0.0001) differences were observed in comparison to negative controls at all tested doses (5-1000 μg/ml). In all studied cancer cells, PSE reduced the cell viability to values below 23%, even at the lowest doses. In all cases, IC50 was determined at doses below 5 μg/ml. In this regard, SKOV3 ovarian cancer cells were the most responsive to antiproliferative effects of PSE with a maximum mean growth inhibition of 86.8% vs. 82.8%, 81.4% and 80.0% in MCF-7, PC-3 and A549 cells,respectively.
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