Contrast enhancement in 1p/19q-codeleted anaplastic oligodendrogliomas is associated with 9p loss, genomic instability, and angiogenic gene expression
Authors: German Reyes-Botero, Caroline Dehais, Ahmed Idbaih, Nadine Martin-Duverneuil, Marion Lahutte, Catherine Carpentier, Eric Letouzé, Olivier Chinot, Hugues Loiseau, Jerome Honnorat, Carole Ramirez, Elisabeth Moyal, Dominique Figarella-Branger, François Ducray, Christine Desenclos, Henri Sevestre, Philippe Menei, Sophie Michalak, Edmond Al Nader, Joel Godard, Gabriel Viennet, Antoine Carpentier, Sandrine Eimer, Phong Dam-Hieu, Isabelle Quintin-Roué, Jean-Sebastien Guillamo, Emmanuelle Lechapt-Zalcman, Jean-Louis Kemeny, Pierre Verrelle, Thierry Faillot, Claude Gaultier, Marie Christine Tortel, Christo Christov, Caroline Le Guerinel, Marie-Hélène Aubriot-Lorton, Francois Ghiringhelli, François Berger, Catherine Lacroix, Fabrice Parker, François Dubois, Claude-Alain Maurage, Edouard-Marcel Gueye, Francois Labrousse, Anne Jouvet, Luc Bauchet, Valérie Rigau, Patrick Beauchesne, Jean-Michel Vignaud, Mario Campone, Delphine Loussouarn, Denys Fontaine, Fanny Vandenbos, Chantal Campello, Pascal Roger, Melanie Fesneau, Anne Heitzmann, Jean-Yves Delattre, Selma Elouadhani, Karima Mokhtari, Marc Polivka, Damien Ricard, Pierre-Marie Levillain, Michel Wager, Philippe Colin, Marie-Danièle Diebold, Dan Chiforeanu, Elodie Vauleon, Olivier Langlois, Annie Laquerriere, Marie Janette Motsuo Fotso, Michel Peoc'h, Marie Andraud, Servane Mouton, Marie-Pierre Chenard, Georges Noel, Nicolas Desse, Raoulin Soulard, Alexandra Amiel-Benouaich, Emmanuelle Uro-Coste, Frederic Dhermain
Journal: Neuro-Oncology (2013)

The aim of this study was to correlate MRI features and molecular characteristics in anaplastic oligodendrogliomas (AOs). The MRI characteristics of 50 AO patients enrolled in the French national network for high-grade oligodendroglial tumors were analyzed. The genomic profiles and IDH mutational statuses were assessed using high-resolution single-nucleotide polymorphism arrays and direct sequencing, respectively. The gene expression profiles of 25 1p/19q-codeleted AOs were studied on Affymetrix expression arrays. Most of the cases were frontal lobe contrast-enhanced tumors (52%), but the radiological presentations of these cases were heterogeneous, ranging from low-grade glioma-like aspects (26%) to glioblastoma-like aspects (22%). The 1p/19q codeletion (n = 39) was associated with locations in the frontal lobe (P = .001), with heterogeneous intratumoral signal intensities (P = .003) and with no or nonmeasurable contrast enhancements (P = .01). The IDH wild-type AOs (n = 7) more frequently displayed ringlike contrast enhancements (P = .03) and were more frequently located outside of the frontal lobe (P = .01). However, no specific imaging pattern could be identified for the 1p/19q-codeleted AO or the IDH-mutated AO. Within the 1p/19q-codeleted AO, the contrast enhancement was associated with larger tumor volumes (P = .001), chromosome 9p loss and CDKN2A loss (P = .006), genomic instability (P = .03), and angiogenesis-related gene expression (P < .001), particularly for vascular endothelial growth factor A and angiopoietin 2. In AOs, the 1p/19q codeletion and the IDH mutation are associated with preferential (but not with specific) imaging characteristics. Within 1p/19q-codeleted AO, imaging heterogeneity is related to additional molecular alterations, especially chromosome 9p loss, which is associated with contrast enhancement and larger tumor volume.