Lung Cancer Is Nation's Top Cancer Killer

(Undated) -- Lung cancer is the nation's most lethal disease. Doctor Peter Mazzone says getting a CT scan can help catch lung cancer early. Most lung cancer is found once it's in its later stages, and at that point it may be treatable but not curable. People between the ages of 55 and 74 who smoked two-packs-a-day for at least 15 years are considered to be at high risk for lung cancer and should be screened.