Preface

Lung adenocarcinoma is the most common histological subtype of lung cancer all over the world, accounting for nearly 40% of lung cancer, even in young people and in tumors detected in screening low-dose computed tomography programs. Over the past decade, the great advances in clinical, radiological, molecular biological and pathological aspects have been made in lung cancer field, mainly focusing on lung adenocarcinoma. In order to satisfy the current clinical practice and research communication, the previous 2004 WHO lung adenocarcinoma classification urgently needs to be revised.