ANXA5 and cancer: To clarify the mechanism underlying the CLEFMA‐induced reduction of HeLa and SiHa cancer cell viability, cell apoptosis was analysed using flow cytometry with fluorescein isothiocyanate–labelled annexin V and PI after treatment with 0, 5, 10, 20, or 40 μM CLEFMA in these cancer cells for 24 h (Figure 2A).