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Endobronchial ultrasound-guidance for interstitial photodynamic therapy of locally advanced lung cancer-a new interventional concept.

Recent advances in interventional pulmonology led to a significant expansion of the diagnostic and therapeutic role of endobronchial ultrasound. In this paper, we describe a new concept for using endobronchial ultrasound to guide interstitial photodynamic therapy (PDT). For this purpose, we conducted in vitro and in vivo experiments using a phantom and animal models, respectively. A new 0.5 mm optical fiber, with cylindrical diffuser end, was used to deliver the therapeutic light through the 21-gauge endobronchial ultrasound needle. The animal experiments were performed under real-time ultrasonography guidance in mice and rabbits' tumor models. Safe and effective fiber placements and tumor illumination was accomplished. In addition, computer simulation of light propagation suggests that locally advanced lung cancer tumor can be illuminated. This study demonstrates the potential feasibility of this new therapeutic modality approach, justifying further investigation in the treatment of locally advanced lung cancers.

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