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A topically administered metabolic precursor of protoporphyrin IX. After topical administration, aminolevulinic acid hydrochloride (ALA HCl) is converted to protoporphyrin IX (PpIX) which is a photosensitizer. When the proper wavelength of light activates protoporphyrin IX, singlet oxygen is produced, resulting in a local cytotoxic effect. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C1849\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C1849\' NCI Thesaurus)
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