MR-based biomarkers in the diagnosis and the evaluation of the therapeutic response to radiotherapy (ETRR) in prostatic carcinoma (PCa): Implementation of clinical and experimental approaches

Autor: Alexandre Cochet, Xavier Tizon, Philippe Maingon, Sébastien Parfait, Paul Walker, Gilles Créhange, Olivier Duchamp, Peggy Provent, François Brunotte
Přispěvatelé: Centre Régional de Lutte contre le cancer - Centre Georges-François Leclerc ( CRLCC - CGFL ), Laboratoire Electronique, Informatique et Image ( Le2i ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ) -AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, Oncodesign Inc., Oncodesign Biotechnology®, Centre Régional de Lutte contre le cancer Georges-François Leclerc [Dijon] (UNICANCER/CRLCC-CGFL), UNICANCER, Laboratoire Electronique, Informatique et Image [UMR6306] (Le2i), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, Oncodesign [Dijon], Walker, Paul
Rok vydání: 2009
Předmět:
Zdroj: Journal of Clinical Oncology
JOURNAL OF CLINICAL ONCOLOGY
45th Annual Meeting of the American-Society-of-Clinical-Oncology
45th Annual Meeting of the American-Society-of-Clinical-Oncology, May 2009, Orlando, United States. 27 (15), pp.e16136, 2009
45th Annual Meeting of the American-Society-of-Clinical-Oncology, May 2009, Orlando, United States. pp.e16136
ISSN: 1527-7755
0732-183X
DOI: 10.1200/jco.2009.27.15_suppl.e16136
Popis: e16136 Background: ETRR in PCa remains a challenging task. New biomarkers in the form of metabolites, detected with Proton Magnetic Resonance Spectroscopy (1H-MRS), and quantitative Apparent Diffusion Coefficient (ADC), determined with Diffusion-Weighted Magnetic Resonance Imaging, could be of value in the ETRR for PCa. Methods: Twenty-one men with biopsy proven localized PCa were examined before external radiotherapy. 3D-1H-MRS was performed at 3.0T without endorectal coils. The delivered radiotherapy dose was 78 Gy in 39 fractions with 6 MV photons. MR follow-up examinations up to 36 months post-radiotherapy were performed. For the pre-clinical study, healthy rat prostate was studied in 3 nude rats. PC3-MM2 and PAC-120 tumors were subcutaneously (SC) and orthotopically (OT) xenografted in 5 nude rats, respectively. Radiotherapy anti-tumor efficacy administered as HDR-brachytherapy (SC) or X6 external beam irradiation (OT) delivering 10 Gy/5 fractions was evaluated. 1H-MRS was performed at 4.7 T using SVS. Results: Twelve men received the 3-month examination, 8 patients are at 6-months, 4 are at 9 months and 1 has been followed for 1 year. At baseline, healthy prostate shows a low Choline (Cho)/Citrate ratio, whereas the presence of cancer considerably increases this ratio. At 3 months, we observed metabolic atrophy except for Cho. Although, higher ADC values are normally found in peripheral zone than in central gland, these differences disappear after radiotherapy. In healthy rat prostate high levels of Cho without citrate were noted. Cho and free lipids were detected in PC3-MM2 and PAC120 SC-grafted tumors, with a higher Cho content in PC3-MM2. Radiotherapy induced significant antitumor activity in PC3-MM2 (SC) (T/C% = 38%) and OT (ILS% = 58%) tumors, but was not efficient in PAC120 SC-grafted tumors (T/C% = 90%). Radiotherapy slightly modified Cho content 4 days after the end of treatment but no modification on overall metabolic profile was observed before, during and after radiotherapy. Conclusions: Combined ADC and Cho are powerful biomarkers for the detection of PCa in men and could be useful for ETRR.The use of Cho in ETRR for PCa in rats appears to be promising. No significant financial relationships to disclose.
Databáze: OpenAIRE
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