Lung cancer in non-smokers (LCINS) is an increasing public health problem. The BioCAST (IFCT-1002) study, promoted by Intergroupe Francophone de Cancérologie Thoracique (IFCT), focuses on this entity. It is a national, multicentric, prospective epidemiological study. Main objective is to describe the clinical and molecular epidemiology of LCINS in a large French cohort composed by cases newly diagnosed in participating centres (around to 1000 patients expected). The clinical component of the study is based on collecting data directly from the patient through a standardized questionnaire during a telephone interview with a health professional. The biologic component includes a blood sample collection. A large genomic-wide association study and an epigenetic study are also planned. BioCAST hopes to provide concrete answers to clinicians and patients questions about this new and frequent entity.