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. 2004 Mar 16;90(8):1660–1665. doi: 10.1038/sj.bjc.6601722

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Copyright © 2004 Cancer Research UK

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Dark and PDT toxicity of ALA and ALA derivatives. Cells were incubated for 3 h in the presence of different amounts of ALA or its derivatives in the dark (A) or exposed to 0.25 (B) and 0.4 J cm⁻² of light (C). The MTT assay was performed after 19 h. Cell survival is expressed as a percentage of the control nonirradiated and exposed to ALA or derivatives.