Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.ejpb.2008.02.013
Title: Improved formulation of photosensitizer chlorin e6 polyvinylpyrrolidone for fluorescence diagnostic imaging and photodynamic therapy of human cancer
Authors: Chin, W.W.L.
Heng, P.W.S. 
Thong, P.S.P.
Bhuvaneswari, R.
Hirt, W.
Kuenzel, S.
Soo, K.C.
Olivo, M. 
Keywords: Biodistribution
Chlorin e6
Fluorescence diagnosis
Formulation
Imaging
Photodynamic therapy
Photosensitizer
Polyvinylpyrrolidone
Issue Date: Aug-2008
Citation: Chin, W.W.L., Heng, P.W.S., Thong, P.S.P., Bhuvaneswari, R., Hirt, W., Kuenzel, S., Soo, K.C., Olivo, M. (2008-08). Improved formulation of photosensitizer chlorin e6 polyvinylpyrrolidone for fluorescence diagnostic imaging and photodynamic therapy of human cancer. European Journal of Pharmaceutics and Biopharmaceutics 69 (3) : 1083-1093. ScholarBank@NUS Repository. https://doi.org/10.1016/j.ejpb.2008.02.013
Abstract: An improved formulation of the photosensitizer chlorin e6 (Ce6) in combination with the hydrophilic polymer polyvinylpyrrolidone (PVP) was investigated for its potential clinical applications in fluorescence diagnosis and photodynamic therapy (PDT) of cancer. This study reports the comparative preclinical biodistribution and efficacy of Ce6 delivered with or without PVP versus dimethyl sulfoxide (DMSO). The safety and fluorescence pharmacokinetics of Ce6-PVP in humans was also accessed. Biodistribution results showed that Ce6-PVP had higher tumor to normal tissue ratio compared to the other formulations. The sensitivity and specificity derived from the area under the receiver operating characteristics curves showed that the formulations were able to discriminate tumor from peritumoral muscle in the following order: Ce6-PVP > Ce6 > Ce6-DMSO. In vitro PDT results showed that Ce6-PVP was found to induce selective phototoxicity in leukemic cells compared to peripheral mononuclear blood cells. In addition, in vivo light irradiation at 1 h after Ce6-PVP was found to induce greater tumor necrosis without causing animal toxicity. In patients, preferential accumulation of Ce6-PVP was observed in angiosarcoma lesions compared to normal skin following intravenous administration. In conclusion, PVP significantly enhanced the Ce6 concentration in tumors compared with Ce6 alone and increased the therapeutic index of PDT without any side effects in animal model. No serious adverse events were observed in human as well. © 2008 Elsevier B.V. All rights reserved.
Source Title: European Journal of Pharmaceutics and Biopharmaceutics
URI: http://scholarbank.nus.edu.sg/handle/10635/106029
ISSN: 09396411
DOI: 10.1016/j.ejpb.2008.02.013
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