NKX2-1 and lung cancer: ,23,24,25Nkx2.1-CreERT2;BrafCA mice represent an alternative and conceptually more suitable lung cancer model by which BRAFV600E-driven tumorigenesis can be monitored stagewise from benign nodules to invasive carcinomas without additional genetic manipulations other than the Nkx2-1 null heterozygous background genotype.