Tetramethylpyrazine inhibits proliferation of colon cancer cells in vitro

Figure 5 Tetramethylpyrazine induces apoptosis of colon cancer cells. A: SW480 and HCT116 cells were induced to have a marked increase in the proportion of apoptosis rate, especially when the concentration of tetramethylpyrazine reached 600 µg/mL. B: The SW480 cells showed early apoptosis, whereas the HCT116 cells showed late apoptosis.