Introduction One of the most important health problems today is cancer. The aim of this study was to investigate the in vitro effect of yarrow (Y) with known anticarcinogenic effect on Ehrlich ascites tumor (EAT). Materials and Methods The above-ground part (300 g) of Y was macerated with water and extracted three times for 24 hours at 37°C in a shaking water bath. In the study, EAT cells were divided into control, DMSO group 5-FU, 50, 100, 200, 400 and 800 μg/ml YP groups. Results At the end

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... the hour, it was observed that total apoptosis increased significantly in Y groups (especially 50 μg/ml) compared to the control group (p<0.05). It was observed that Y slowed the division of EAT cells (especially 800 μg/ml) by stopping the cell cycle at the G0/G1 stage. It was concluded that Y (especially at high doses) triggered apoptosis by significantly increasing the percentage of total depolarized cells (p<0.001) in all three time periods. Conclusions The results obtained showed that Y extract may have an antitumoral effect on EAT cells. It is thought that this study will contribute to studies on cancer treatment.