Table I.

Inhibitory effects of 9(11)-DHEP on cell viability of different cell lines.

Cell line	IC50 (µg/ml)
A375	9.462±1.78
Colo201	13.02±0.34
SW620	32.87±0.76
MCF-7	16.89±1.40
MCF-10A-2	67.89±2.64
Hs68	40.46±1.39

Cells were treated with various concentrations of the steroid for 72 h; and cell viability was determined by the MTT assay. The IC₅₀ concentrations represented the concentration of the steroid, which resulted in 50% inhibition of cell viability in relation to control after incubation. Results are expressed as mean value of three independent experiments. The IC₅₀ values were obtained from linear regression of analysis (r²>0.97). 9(11)-DHEP, 9,11-dehydroergosterol peroxide.