Table 1. Cytotoxicity of 4EGI-1 isomers on breast CSCs and breast cancer cells.

BCSCs and breast cancer cells	IC50 of [E]-4EGI-1(μM)	IC50 of [Z]-4EGI-1(μM)
SKBR-3	30±1.5	29±1.3
MCF-7	30±0.9	30±1.1
MDA-MB-231	32±1.2	30±1.4
Non-BCSCs of HMLER(CD44high/CD24low)SA	24±1.1	22±0.7
BCSCs of HMLER(CD44high/CD24low)FA	11±0.8	10±0.6

Note: IC₅₀ means inhibitory concentration that leads to 50% cell viability decrease.