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Real-time control of photobleaching trajectory during photodynamic therapy

Identifieur interne : 000972 ( Hal/Curation ); précédent : 000971; suivant : 000973

Real-time control of photobleaching trajectory during photodynamic therapy

Auteurs : Jean-Baptiste Tylcz [France] ; Thierry Bastogne [France] ; Alexia Bourguignon [France] ; Sophie Pinel [France] ; Magali Toussaint [France] ; Céline Frochot [France] ; Muriel Barberi-Heyob [France]

Source :

RBID : Hal:hal-01078940

Abstract

Introduction: obstacles and challenges to the clinical use of the photodynamic therapy (PDT) are numerous: large inter-individual variability, heterogeneity of therapeutic predictability, lack of in vivo monitoring concerning the reactive oxygen species (ROS) production, etc. All of these factors affect in their ways the therapeutic response of the treatment and can lead to a wild uncertainty on its efficiency. Objective: to deal with these variability sources, we have designed and developed an innovative technology able to adapt in realtime the width of light impulses during the photodynamic therapy. The first objective is to accurately control the photobleaching trajectory of the photosensitizer during the treatment with a subsequent goal to improve the efficacy and reproducibility of this therapy.Methods: in this approach, the physician a priori defines the expected trajectory to be tracked by the photosensitizer photobleaching during the treatment. The photobleaching state of the PS is regularly measured during the treatment session and is used to change in real-time the illumination signal. This adaptive scheme of the photodynamic therapy has been implemented, tested and validated during in vitro tests.Results: these tests show that controlling the photobleaching trajectory is possible, confirming the technical feasibility of such an approach to deal with inter-individual variabilities in PDT. These results open new perspectives since the illumination signal can be different from a patient to another according to his individual response.Conclusions: this study has proven its interest by showing promising results in an in vitro context, which has to be confirmed by the current in vivo experiments. However, it is fair to say that in a near future, the proposed solution could lead, in fine, to an optimized and personalized PDT.

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<div type="abstract" xml:lang="en">Introduction: obstacles and challenges to the clinical use of the photodynamic therapy (PDT) are numerous: large inter-individual variability, heterogeneity of therapeutic predictability, lack of in vivo monitoring concerning the reactive oxygen species (ROS) production, etc. All of these factors affect in their ways the therapeutic response of the treatment and can lead to a wild uncertainty on its efficiency. Objective: to deal with these variability sources, we have designed and developed an innovative technology able to adapt in realtime the width of light impulses during the photodynamic therapy. The first objective is to accurately control the photobleaching trajectory of the photosensitizer during the treatment with a subsequent goal to improve the efficacy and reproducibility of this therapy.Methods: in this approach, the physician a priori defines the expected trajectory to be tracked by the photosensitizer photobleaching during the treatment. The photobleaching state of the PS is regularly measured during the treatment session and is used to change in real-time the illumination signal. This adaptive scheme of the photodynamic therapy has been implemented, tested and validated during in vitro tests.Results: these tests show that controlling the photobleaching trajectory is possible, confirming the technical feasibility of such an approach to deal with inter-individual variabilities in PDT. These results open new perspectives since the illumination signal can be different from a patient to another according to his individual response.Conclusions: this study has proven its interest by showing promising results in an in vitro context, which has to be confirmed by the current in vivo experiments. However, it is fair to say that in a near future, the proposed solution could lead, in fine, to an optimized and personalized PDT.</div>
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<forename type="first">Alexia</forename>
<surname>Bourguignon</surname>
</persName>
<idno type="halAuthorId">1092458</idno>
<affiliation ref="#struct-185180"></affiliation>
</author>
<author role="aut">
<persName>
<forename type="first">Sophie</forename>
<surname>Pinel</surname>
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<idno type="halAuthorId">89498</idno>
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<author role="aut">
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<forename type="first">Magali</forename>
<surname>Toussaint</surname>
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<idno type="halAuthorId">773584</idno>
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<author role="aut">
<persName>
<forename type="first">Céline</forename>
<surname>Frochot</surname>
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<idno type="halAuthorId">133064</idno>
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<forename type="first">Muriel</forename>
<surname>Barberi-Heyob</surname>
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<idno type="halAuthorId">89501</idno>
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<affiliation ref="#struct-73720"></affiliation>
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<idno type="localRef">SBS</idno>
<idno type="localRef">INRIA BIGS</idno>
<meeting>
<title>International Congress on Photodynamic Applications, ICPA 2014</title>
<date type="start">2014-05-25</date>
<date type="end">2014-05-28</date>
<settlement>Dundee</settlement>
<country key="GB">United Kingdom</country>
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<imprint>
<date type="datePub">2014-05-25</date>
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<classCode scheme="halDomain" n="sdv.can">Life Sciences [q-bio]/Cancer</classCode>
<classCode scheme="halTypology" n="COMM">Conference papers</classCode>
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<abstract xml:lang="en">Introduction: obstacles and challenges to the clinical use of the photodynamic therapy (PDT) are numerous: large inter-individual variability, heterogeneity of therapeutic predictability, lack of in vivo monitoring concerning the reactive oxygen species (ROS) production, etc. All of these factors affect in their ways the therapeutic response of the treatment and can lead to a wild uncertainty on its efficiency. Objective: to deal with these variability sources, we have designed and developed an innovative technology able to adapt in realtime the width of light impulses during the photodynamic therapy. The first objective is to accurately control the photobleaching trajectory of the photosensitizer during the treatment with a subsequent goal to improve the efficacy and reproducibility of this therapy.Methods: in this approach, the physician a priori defines the expected trajectory to be tracked by the photosensitizer photobleaching during the treatment. The photobleaching state of the PS is regularly measured during the treatment session and is used to change in real-time the illumination signal. This adaptive scheme of the photodynamic therapy has been implemented, tested and validated during in vitro tests.Results: these tests show that controlling the photobleaching trajectory is possible, confirming the technical feasibility of such an approach to deal with inter-individual variabilities in PDT. These results open new perspectives since the illumination signal can be different from a patient to another according to his individual response.Conclusions: this study has proven its interest by showing promising results in an in vitro context, which has to be confirmed by the current in vivo experiments. However, it is fair to say that in a near future, the proposed solution could lead, in fine, to an optimized and personalized PDT.</abstract>
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