Rebuttal from Professor Sanja Dacic

First of all, I would like to thank Dr. Helmut Popper for his discussion on controversial areas in the 2015 WHO classification of mucinous lung adenocarcinomas. Many points are related to the fact that mucinous adenocarcinomas are less common than non-mucinous lung adenocarcinoma and our knowledge about this subset of lung carcinoma is still relatively limited.