An embodiment of the invention provides a cannabis-based flavonoid pharmaceutical composition including any one or more selected, from among the group of Apigenin, Cannflavin. A. Cannflavin B, Cannflavin C, Chrysoeriol, Cosmosiin, Flavocannabiside, Kaempferol, Luteolin, Myricetin, Orientin, Isoorientin (Homoorientin), Quercetin (+)-Taxifolin, Vitexin, and Isovitexin, or their synthases, for the prevention and treatment of certain cancers that can be treated by therapeutically targeting oncogenic factors including kinases, sirtuins, bromodomains, matrix metalloproteinases and BCL-2. Some of the cancers that can be treated by use of cannabis flavonoids based on the inhibition of these therapeutic targets include brain, breast, colon, renal, liver, lung, pancreatic, prostate, leukemia, melanoma as well as any other cancers that overexpress the oncogenic factors inhibited by the cannabis flavonoids identified herein.
