Fig. 6

Viability of cancerous (MCF-7, human) and non-cancerous (MCF-10A, human) cells exposed to different concentrations of S444 for 15 min, and then kept in the dark or irradiated (660 nm, 4.4 J/cm²). Cell viability was evaluated by the MTT method 24 h after treatment. The CC₅₀ and CC₁₀₀ of S444 after irradiation were 3.0 and 93.0 nM, respectively. *p < 0.05, **p < 0.01, and ***p < 0.001, for dark vs irradiated