I suppose you frame the question in a more objective way. Like what is the product, what cell line and inhibition of which property. As far as I understand, you are interested in evaluating anticancer properties of some plant extract that you call a natural product. An perhaps you are evaluating its effects on cell growth and division (and presumably markers of metastasis) in some cancer cell line.
Could you please give names to all those things that I have made bold in the text. That will help us to help you better.
As you understand, I am interested in the anticancer activities of molecules derived from plants used in traditional medicine harvested in Tunisia flora, I have already evaluated their effects on the growth of cancer cells of the hep-2 and k562 type by in vitro models, currently I will like to go forward and study the signaling pathways involved!