For example, a lung cancer biopsy showing “carcinoma” on the H&E section is typically stained for a set of markers to determine whether it is best classified as adenocarcinoma or squamous carcinoma, as most adenocarcinomas will be positive for TTF1 and NapsinA, but negative for p63, and vice versa (Inamura, 2018). This evidence concerns the gene TTF1 and adenocarcinoma.