Publication date: Available online 6 November 2017
Source:Cancer/Radiothérapie
Author(s): J.-M. Cosset, G. Créhange
La curiethérapie de rattrapage après une première irradiation prostatique est une technique émergente qui vient enrichir l'arsenal thérapeutique dans ces situations difficiles de patients atteints de rechute locale isolée d'un cancer de prostate potentiellement curable. Ces rechutes occultes sont dépistées actuellement de plus en plus précocement à la progression de l'antigène spécifique de la prostate grâce aux avancées des techniques de biopsies, guidées par l'information des nouvelles imageries par résonance magnétique (IRM) et tomographie par émission de positons (TEP). Bénéficiant de la précision balistique propre à la curiethérapie en général (dosimétrie tridimensionnelle), elle permet d'observer des taux de contrôle tumoral supérieur à 50 % à long terme. Ses taux d'incontinence sont constamment inférieurs à ceux observés avec les techniques concurrentes telles que la prostatectomie radicale de rattrapage, les ultrasons focalisés ou la cryothérapie. Un consensus est aujourd'hui établi sur les critères de sélection des patients susceptibles de bénéficier de la curiethérapie de rattrapage. Le consensus est en revanche encore partiel pour ce qui concerne certains détails techniques : bas ou haut débit de dose ? Quelle dose exacte ? Dans quel volume (partiel ou total) ? En attendant les résultats imminents de deux essais de phases II et compte tenu des résultats hétérogènes de la littérature existante, cette technique, d'ores et déjà considérée comme validée dans certaines recommandations américaines (NCCN version 3.2016), doit continuer à être évaluée, préférentiellement dans le cadre d'essais cliniques contrôlés.Salvage brachytherapy after a first prostate radiation therapy is an emerging technique, which has to be considered in the therapeutic armamentarium in the clinically challenging context of patients with isolated local failure from prostate cancer who may still be considered for cure. These occult failures are more and more frequently diagnosed at an early stage, thanks to targeted biopsies and advances in imaging modalities, such as multiparametric MRI and PET-CT. Salvage brachytherapy benefits from the implantation accuracy of brachytherapy procedures using 3D dosimetry and has resulted in more than 50% tumour control rates with long-term. Incontinence rates are always below those of other salvage treatments such as radical prostatectomy, HIFU or cryotherapy. Today, a consensus has been reached to better define good candidates for salvage brachytherapy with respect to disease characteristics at baseline and at failure. No consensus has been clearly defined yet regarding the choice of the technique (low or high dose rate), the total dose to be delivered, or the volume to be implanted (whole gland or focal). While we await robust data from recently completed phase II studies and given the heterogeneous results in the literature, this technique (although already included in the last 2016 NCCN guidelines) remains to be precisely evaluated, optimally within the frame of controlled trials.
from #ORL-AlexandrosSfakianakis via ola Kala on Inoreader http://ift.tt/2zDz9nB
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