Association between CD47 expression, clinical characteristics and prognosis in patients with advanced non‐small cell lung cancer oleh Oscar Arrieta, Alejandro Aviles‐Salas, Mario Orozco‐Morales, Norma Hernández‐Pedro, Andrés F. Cardona, Luis Cabrera‐Miranda, Pedro Barrios‐Bernal, Giovanny Soca‐Chafre, Graciela Cruz‐Rico, María de Lourdes Peña‐Torres, Guadalupe Moncada‐Claudio, Laura‐Alejandra Ramirez‐Tirado