Droese M, Bayer E
Dtsch Med Wochenschr. 1976 Sep 24;101(39):1417-20. doi: 10.1055/s-0028-1104284.
Reliability of cytological classification of tumours from material obtained from sputum or bronchial secretion was tested on 116 histologically confirmed cases of bronchial carcinoma. Squamous-cell carcinoma and small-cell undifferentiated carcinoma were most often correctly classified, results being less good with large-cell undifferentiated carcinoma, adenocarcinoma taking an intermediary position.