<qa>  What is the last randomized in two arms?MILD study recruits subjects randomized in 2 groups: a control group undergoes to a program of primary prevention with pulmonary function test evaluation and a group to periodic spiral CT associated with primary prevention and pulmonary function test evaluation. The last one is randomized in two arms: yearly low-dose CT vs CT every 2 years. MILD trial comprehensive design combines for the first time primary prevention with early detection and molecular risk profiling representing an innovative research against lung cancer. 