Lung cancer is not a single neoplasm but a group of aggressive
malignant tumors of the lower respiratory tract and are by far the most
lethal of human tumors for men in the world and since 1987 it exceeded
breast cancer as the leading cancer cause of death in women in the U.S.
(68,800 vs. 39,800 respectively in 2004), a fact not well known among
women and many health professionals