Extended duration light activated cancer therapy

A - Human Necessities – 61 – K

Patent

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Details

A61K 31/40 (2006.01) A61K 41/00 (2006.01)

Patent

CA 2382345

The present invention is drawn to methods and compounds for photodynamic therapy (PDT) of a target tissue or compositions in a mammalian subject, using a light source that preferably transmits light to a treatment site transcutaneously. The method provides for administering to the subject a therapeutically effective amount of a photosensitizing agent. This photosensitizing agent preferentially associates with the target tissue. Light at a wavelength or waveband corresponding to that which is absorbed by the photosensitizing agent is then administered. The light intensity is relatively low, but a high total fluence is employed to ensure the activation of the photosensitizing agent. Transcutaneous PDT is useful in the treatment of specifically selected target tissues, such as vascular endothelial tissue, the abnormal vascular walls of tumors, solid tumors of the head and neck, tumors of the gastrointestinal tract, tumors of the liver, tumors of the breast, tumors of the prostate, tumors of the lung, nonsolid tumors, malignant cells of the hematopoietic and lymphoid tissue and other lesions in the vascular system or bone marrow, and tissue or cells related to autoimmune and inflammatory disease.

La présente invention concerne des techniques et des composés pour la thérapie photodynamique (PDT) d'un tissu ou de compositions cibles chez un mammifère au moyen d'une source lumineuse qui transmet de préférence la lumière jusqu'à un site de traitement par voie transcutanée. Cette méthode consiste à administrer à un sujet une dose efficace au plan thérapeutique d'un agent photosensibilisant. Cet agent s'associe de préférence avec le tissu cible. On projette ensuite une lumière dont la longueur d'onde ou la largeur de bande correspond à celle absorbée par l'agent photsensibilisant. La photosensibilité est relativement faible, mais on utilise une fluence totale élevée pour déclencher l'action de l'agent photsensibilisant. La thérapie photodynamique transcutanée convient pour le traitement de tissus cibles spécifiques tels que le tissu endothélial vasculaire, des parois vasculaires anormales de tumeurs, des tumeurs solides de la tête et du cou, des tumeurs de l'appareil gastro-intestinal, du foie, du sein, de la prostate, du poumon, des tumeurs non solides, des cellules malignes du tissu hémapoïétique et lymphoïde et autres lésions du système vasculaire ou de la moelle osseuse ainsi que des tissus ou des cellules dans le cadre d'une maladie auto-immune ou inflammatoire.

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