<![CDATA[Colon cancer is one of the most common death-caused cancer. The high mortality rate indicates that chemotherapy has not overcome cancer disease. Strategies and development of colon cancer treatment should be pursued. Compound 1-(2,5-dihydroxyphenyl)-3-pyridine-2-yl-propenone is the 2ʹ,5ʹ-dihydroxychalcone derivative, of which the B ring was substituted with 2-pyridine ring. Chalcone and its derivatives have been reported to have several biological activities, such as cytotoxic, anti-inflammatory, antiHIV, and as a tyrosine kinase inhibitor. The objectives of this research was to determine the cytotoxic activity on WiDr colon cancer cells of 1-(2,5-dihydroxyphenyl)-3-pyridine-2-yl-propenone. Cytotoxic activity was measured using MTT assay. Compound 1-(2,5-dihydroxyphenyl)-3-pyridine-2-yl-propenone inhibited WiDr cell growth with the IC50 of 16 µM. Morphology of WiDr cell showed that compound 1-(2,5-dihydroxyphenyl)-3-pyridine-2-yl-propenone inhibited cell growth in dose dependent.Keywords: compound 1-(2,5-dihydroxyphenyl)-3-pyridine-2-yl-propenone, WiDr colon cancer cell line, cytotoxic activity]]>
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