Zusammenfassung
Hintergrund
Das Harnblasenkarzinom ist der dritthäufigste Tumor in Deutschland. Die Resektionstherapie beim oberflächlichen Harnblasenkarzinom (Ta, CIS) sieht derzeit schon die photodynamische Diagnostik (PDD) mit HEXVIX® zur besseren Beurteilung der Tumorausbreitung vor. Versuche, diese Photosensibilisatoren auch zur photodynamischen Therapie (PDT) zu nutzen, haben nur begrenzte Erfolge gezeigt. Insbesondere die zu geringe Gewebepenetration aufgrund der Anregung mit kurzwelligem Licht ist eine wesentliche Einschränkung.
Methode
Im Rahmen eines DFG-Projekts untersuchen wir die Möglichkeiten der PDT mit dem neuen, im nahen Infrarot effektiv anregbarem Photosensibilisator Tetrahydroporphyrin-Tetratosylat (THPTS).
Ergebnisse
Aufgrund des im sog. „phototherapeutischen Fenster“ liegenden Absorptionsmaximums bei 760 nm und der damit möglichen Gewebepenetration von 15 mm ist THPTS auch für die PDT von größeren, soliden Tumoren geeignet, was wir in verschiedenen anderen Tumorentitäten bereits zeigen konnten. Damit könnte die PDT erstmals auch für muskelinvasiv wachsende Harnblasenkarzinome (≥ T2) in Frage kommen. Dies soll in einem orthotopen Rattenharnblasentumormodell überprüft werden.
Abstract
Background
Bladder cancer (BCa) is the third most common tumor in Germany. Currently, resection therapy for superficial BCa (Ta, CIS) includes photodynamic diagnostics (PDD) using HEXVIX® for improved assessment of tumor spread. Trials using these photosensitizers for photodynamic therapy (PDT) showed only limited success. Especially low tissue penetration due to short-wave excitation was a limiting factor.
Methods
This study which was funded by the German Research Foundation (DFG) examined the feasibility of the novel photosensitizer tetrahydroporphyrin-tetratosylate (THPTS) for PDT in a rat bladder cancer model.
Results
As THPTS is very effectively excitable at a near infrared wavelength of 760 nm it is within the so-called phototherapeutic window and allows tissue penetration of up to 15 mm. Thus THPTS can also be used for PDT of larger, solid tumors as was previously demonstrated for other tumor entities. Therefore, effective treatment of even muscle-invasive bladder cancer (≥T2) may become an option using THPTS. In this current study the effectiveness and safety of THPTS-PDT was examined in an orthotopic bladder cancer rat model.
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Danksagung
Dieses Forschungsprojekt wird gefördert von der Deutschen Forschungsgemeinschaft (NE 425/6-1; SCHA 791/3-1). Wir danken Frau Annett Weimann für die exzellente technische Unterstützung.
Einhaltung ethischer Richtlinien
Interessenkonflikt. J. Neuhaus, S. Schastak, M. Berndt, J. Walther, A. Dietel, N. Sieger und J.-U. Stolzenburg geben an, dass kein Interessenkonflikt besteht. Alle nationalen Richtlinien zur Haltung und zum Umgang mit Labortieren wurden eingehalten und die notwendigen Zustimmungen der zuständigen Behörden liegen vor.
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Neuhaus, J., Schastak, S., Berndt, M. et al. Die photodynamische Therapie des Harnblasenkarzinoms. Urologe 52, 1225–1232 (2013). https://doi.org/10.1007/s00120-013-3306-2
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DOI: https://doi.org/10.1007/s00120-013-3306-2