Study of WST11 in Patients With Localized Prostate Cancer

This trial is designed as a multicentre, phase II, open-labeled, single intra-venous (IV) dose study. The patient is to receive general anesthesia. WST11-mediated VTP will consist of the combination of a single IV administration of WST11 at doses of 2 mg/Kg,4mg/Kg or 6 mg/kg, using 753 nm laser light at a fixed power (150mW/cm) and energy (200 J/cm) delivered through transperineal interstitial optical fibers. If deemed necessary and in consideration of the results of the patients treated with 200 J/cm, alternate power (200mW/cm) and alternate energy (300 J/cm) might be applied after Sponsor, Steering Committee and DSMB approval.The fibers are introduced into transparent needles that are positioned in the prostate under ultra sound image guidance (using a brachytherapy like template). The tumor location is established using transrectal biopsy and MR imaging. The number of fibers and the total light energy will be adapted to each patient, taking into account the tumor localization and the volume of the prostate.