REGISTRI: Regorafenib in first-line of KIT/PDGFRA wild type metastatic GIST: a collaborative Spanish (GEIS), Italian (ISG) and French Sarcoma Group (FSG) phase II trial oleh Javier Martin-Broto, Claudia Valverde, Nadia Hindi, Bruno Vincenzi, Javier Martinez-Trufero, Giovanni Grignani, Antoine Italiano, Javier Lavernia, Ana Vallejo, Paolo Dei Tos, Francois Le Loarer, Ricardo Gonzalez-Campora, Rafael Ramos, Diana Hernández-Jover, Antonio Gutierrez, Cesar Serrano, Maria Monteagudo, Rocio Letón, Mercedes Robledo, David S. Moura, Marta Martin-Ruiz, Jose A. López-Guerrero, Julia Cruz, Antonio Fernandez-Serra, Jean-Yves Blay, Elena Fumagalli, Virginia Martinez-Marin