Arch Bronconeumol. 2013;49(11):462–467 w w w.archbronconeumol.org Original Article The Spanish Society of Pulmonology and Thoracic Surgery Lung Cancer Cooperative Group-II Registry. A Descriptive Study  Julio Sánchez de Cos Escuín, a,b,* Mireia Serra Mitjans, c Jesús Hernández Hernández, d Helena Hernández Rodríguez e , other GCCB-II authors ♦ a Sección de Neumología, Hospital San Pedro de Alcántara, Cáceres, Spain b CIBER de Enfermedades Respiratorias (CIBERES), Spain c Servicio de Cirugía Torácica, Hospital Mutua de Terrassa, Terrassa, Barcelona, Spain d Sección de Neumología, Hospital Nuestra Se˜ nora de Sonsoles, Ávila, Spain e Servicio de Cirugía Torácica, Hospital Universitario de Canarias, La Laguna, Tenerife, Spain a r t i c l e i n f o Article history: Received 1 April 2013 Accepted 15 May 2013 Available online 13 October 2013 Keywords: Lung cancer TNM classification Multicentre registry a b s t r a c t Introduction and objectives: The seventh edition of the TNM classification, together with undeniable advantages, has limitations. The International Association for the Study of Lung Cancer (IASLC) Stag- ing Committee has designed an international prospective study to improve this classification. A group of thoracic surgeons and pulmonologists was established in the Spanish Society of Pulmonology and Tho- racic Surgery (SEPAR) Oncology area, and created a registry of new lung cancer (LC) cases to participate in this project. The aim of this paper is to describe the main characteristics of the patients included. Materials and methods: Prospective, observational, multicentre, multiregional data collection (epidemio- logical, clinical, therapeutic and, especially, anatomical extension) study, according to the IASLC protocol, to analyse its prognostic value. Results: Two thousand, four hundred and nineteen patients (83.6% men) from 28 hospitals were included. Ninety-six percent of the men and 54% of the women were smokers or ex-smokers. Chest/abdominal computed tomography (CT) scanning was performed in over 90% and positron emission tomography (PET)/CT scanning in 51.5% of cases. Among the 1035 patients who underwent surgery, 77% had early stages (ia to iib), and 61.6% of those treated using other methods had stage iv. Respiratory comorbidity was higher in men (47.9% versus 21.4%). The most common histological subtype was adenocarcinoma (34%), especially in non-smoking women (69.5%). Conclusions: The proportion of women and adenocarcinomas, as well as those resected at an early stage, increased among LC cases in Spain. © 2013 SEPAR. Published by Elsevier España, S.L. All rights reserved. Registro del Grupo Cooperativo de Cáncer de Pulmón-II de la Sociedad Espa ˜ nola de Neumología y Cirugía Torácica. Estudio descriptivo Palabras clave: Cáncer de pulmón Clasificación TNM Registro multicéntrico r e s u m e n Introducción y objetivos: La 7. a edición de la clasificación TNM, junto a ventajas indudables, presenta limitaciones. El Comité de Estadificación de la International Association for the Study of Lung Cancer (IASLC) ha dise ˜ nado un estudio prospectivo internacional para perfeccionar esa clasificación. En el área de Oncología de la Sociedad Espa ˜ nola de Neumología y Cirugía Torácica (SEPAR) se constituyó un grupo de cirujanos torácicos y neumólogos que creó un registro de nuevos casos de cáncer de pulmón (CP) para participar en ese proyecto. El objetivo del presente trabajo es describir las características principales de los pacientes incluidos. Material y métodos: Estudio prospectivo, observacional, multicéntrico y multirregional de recogida de datos (epidemiológicos, clínicos, funcionales, terapéuticos y, especialmente, de extensión anatómica), según protocolo de la IASLC, para analizar su valor pronóstico.  Please cite this article as: Sánchez de Cos Escuín J, Serra Mitjans M, Hernández Hernández J, Hernández Rodríguez H, and other GCCB-II authors. Registro del Grupo Cooperativo de Cáncer de Pulmón-II de la Sociedad Espa ˜ nola de Neumología y Cirugía Torácica. Estudio descriptivo. Arch Bronconeumol. 2013;49:462–467. * Corresponding author. E-mail addresses: juli1949@separ.es, jsdce@ya.com (J. Sánchez de Cos Escuín). ♦ See Appendix 1. 1579-2129/$ – see front matter © 2013 SEPAR. Published by Elsevier España, S.L. All rights reserved.