Abstract:
:A new photosensitizing agent 5-aminolevulinic acid (ALA)-based photodynamic therapy (PDT) has been demonstrated as a useful method for treatment of superficial neoplastic lesions. The aim of this study was to determine the effects of topically and systemically ALA-based PDT in neoplastic lesions of the oral cavity. Premalignant and malignant lesions of mouse tongue induced by 4-nitroquinoline-l-oxide (4NQO) were used in this study. At 1, 2 and 3 h after topical application of ALA or 3 h after systemic administration of ALA (250 or 1000 mg/kg), the lesions were irradiated with Nd: YAG dye laser at 630 nm (200 J/cm2). Both premalignant and early malignant lesions showed complete response to systemically ALA-based PDT. In an invasive nodular malignant lesion, however, only the superficial portion was affected. There was no apparent difference in the PDT effect between 250 and 1000 mg/kg doses of ALA. In contrast, topically ALA-based PDT had virtually no effect on most lesions. It was concluded that systemically ALA-based PDT is a useful method for treating premalignant and early malignant lesions in the oral cavity, while topically ALA-based PDT using this preparation may be unsuitable for treatment of oral lesions.
journal_name
Oral Oncoljournal_title
Oral oncologyauthors
Ma G,Ikeda H,Inokuchi T,Sano Kdoi
10.1016/s1368-8375(98)00066-9subject
Has Abstractpub_date
1999-01-01 00:00:00pages
120-4issue
1eissn
1368-8375issn
1879-0593pii
S1368-8375(98)00066-9journal_volume
35pub_type
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