PMID: 2120404Jul 1, 1990Paper

Chlorins as photosensitizers in biology and medicine

Journal of Photochemistry and Photobiology. B, Biology
J D Spikes

Abstract

The photodynamic therapy (PDT) of tumors involves illumination of the tumorous area following the administration of a tumor-localizing photodynamic sensitizer. Hematoporphyrin derivative (HPD) and Photofrin II (a purified form of HPD), the main sensitizers used clinically for PDT to date, are complex mixtures of porphyrins; furthermore, these preparations absorb light very poorly in the red region of the spectrum (wavelengths greater than 600 nm) where light penetration into mammalian tissues is greatest. Thus there is considerable interest in identifying new sensitizers that localize more effectively in tumors, absorb more strongly at longer wavelengths and can be prepared in high purity. Much of this interest has been directed towards chlorins (reduced porphyrins), which typically absorb strongly in the red. This review summarizes research that has been carried out on selected types of chlorins, some of which may have important applications as sensitizers for PDT.

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