TTF1 and esophageal adenocarcinoma: We detected TTF-1 positivity in 5 out of 125 cases of esophageal adenocarcinoma (4%), which corresponds to the results of the study by Möller et al., who observed a 3.1% prevalence of TTF-1-positive esophageal adenocarcinomas in their large study on TTF-1 expression in >17,000 tumors of various origins.