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• W2179772909 abstract "The effectiveness of four different photosensitizers for intracranial photodynamic therapy (PDT) of normal brain tissues and an intracranial tumor was investigated in rabbits, using the photodynamic threshold model.PDT is currently being investigated as an adjuvant treatment to surgical resection and/or radio chemotherapy of intracranial neoplasms. While possible neurotoxic side effects of the treatment have been noted, only limited preclinical data quantifying the response of intracranial normal and tumor tissues following PDT are available.The photodynamic threshold dose values for the four photosensitizers, Photofrin, 5-aminolevulinic acid (ALA)-induced Protoporphyrin IX (PpIX), Tin Ethyl Etiopurpurin (SnET2), and chloroaluminum phthalocyanine (AlClPc), were determined using measured light fluence distributions, photosensitizer concentration in tissue, and histologically-determined extent of necrosis following PDT. These measurements were made in normal rabbit brain and in an intracranially-implanted carcinoma (VX2).For Photofrin, AlClPc, and SnET2 (in an emulsion delivery vehicle) normal grey and white matter were very sensitive to PDT, showing a significantly lower threshold dose value than VX2-tumor. For ALA-induced PpIX and SnET2 (in liposome) very little or no white matter damage was observed. Additionally, ALA-PpIX showed significantly lower concentration in white matter than in cortex and tumor. Normal brain structures lacking a blood-brain barrier showed high uptake of all photosensitizers and, hence, are at risk of collateral damage during PDT.For clinical PDT of most adult intracranial neoplasms ALA-induced PpIX appears to be promising, and SnET2 (liposomal) has potential for selective tumor destruction with relative sparing of white matter. Other normal brain structures and, for the other photosensitizers, also white matter are at risk of collateral damage, if exposed to light during PDT." @default.
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• W2179772909 date "1998-04-01" @default.
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• W2179772909 title "Photodynamic Therapy of Intracranial Tissues: A Preclinical Comparative Study of Four Different Photosensitizers" @default.
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• W2179772909 doi "https://doi.org/10.1089/clm.1998.16.81" @default.
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