4、mographyassaywasusedtoassesstheactivityofMMP2,9.ResultsNeithertheproliferationnorVEGFexpressionofK562/A02cellswasinfluencedby0.05μM As2O3after24,48and72hours’incubation.Theactivities of MMP2,9werenoteffectedafter24,48hours’incubationwith0.05μMAs2O3(P>0.05), buttheyweresignificantlyin