PIK3CA mutations are frequent in esophageal squamous cell carcinoma associated with chagasic megaesophagus and are associated with a worse patient outcome by Fernanda Franco Munari, Adriana Cruvinel-Carloni, Croider Franco Lacerda, Antônio Talvane Torres de Oliveira, Cristovam Scapulatempo-Neto, Sandra Regina Morini da Silva, Eduardo Crema, Sheila Jorge Adad, Maria Aparecida Marchesan Rodrigues, Maria Aparecida Coelho Arruda Henry, Denise Peixoto Guimarães, Adhemar Longatto-Filho, Rui Manuel Reis

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