title: Vitamin A levels in lung cancer patients. A case-control study.
mesh_terms: D000328:Adult; D000368:Aged; D001835:Body Weight; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000097:blood*; D008297:Male; D008875:Middle Aged; D012907:Smoking; D013223:Statistics as Topic; D014801:Vitamin A / Q000097:blood*
chemical_list: D014801:Vitamin A