. The Boyden chamber method with slight modifications was used to study the inhibitory effects of EOs on the invasion of HCT 116 cells. A total of 50 μL of Matrigel (5 mg/mL, diluted with RMPI 1:1) was loaded into each well of a 96-well plate and allowed to polymerize for 45 min at 37 °C in an incubator. A total of 5 × 103 cells in 150 μL of RPMI medium containing 25, 50, and 90 μg/mL of EOs (IC25, IC50, and IC90) were added to each well separately and incubated for 24 h. Cells with 0.5% DMSO in media and 5-FU (5 μg/mL) were used as the negative and positive control, respectively.