肺癌是当今世界上很常见的恶性肿瘤之一,已逐渐成为人类的主要死因。近50多年来,肺癌的发病率在世界各国几乎均呈持续上升之势,其发病率和病死率在许多工业发达国家均已上升为恶性肿瘤的第一位。在我国,男性肺癌的发病率和病死率也已跃居各类恶性肿瘤之首,女性发病率则居第一位,死亡率居第二位,因而对人类的健康构成极大危害。 One of the most common malignancies in the world today, lung cancer has gradually become the leading cause of death in humans. Nearly 50 years, the incidence of lung cancer in almost all countries in the world showed a sustained upward trend, the incidence and mortality rates in many industrialized countries have risen to the first malignant tumor. In China, the incidence of male lung cancer and mortality have also leapt to the first of various types of malignant tumors, the incidence of women ranks first, the second highest mortality, which constitutes a great harm to human health.