Research Area: Cancer Biological Activity: Tanshinone I is isolated from Danshen. Tanshinone I, cryptotanshinone and dihydrotanshinone, are structurally similar to tanshinone IIA and may possess similar cytotoxic effects on tumor cells. In preliminary data, tanshinone I possesses the strongest inhibitory effect on tumor necrosis factor-α (TNF-α)-induced adhesion molecules. [1]