Peng, Q Selective distribution of porphyrins in skin thick basal cell carcinoma after topical application of methyl 5-aminolevulinate. [electronic resource] - Journal of photochemistry and photobiology. B, Biology Sep 2001 - 140-5 p. digital Publication Type: Clinical Trial; Journal Article; Randomized Controlled Trial ISSN: 1011-1344 Standard No.: 10.1016/s1011-1344(01)00173-7 doi Subjects--Topical Terms: Administration, TopicalAgedAged, 80 and overAminolevulinic Acid--adverse effectsAnalysis of VarianceCarcinoma, Basal Cell--drug therapyFemaleHumansMaleMiddle AgedPhotosensitizing Agents--adverse effectsPorphyrins--biosynthesisSkin--metabolismSkin Neoplasms--drug therapy