Micropapillary lung adenocarcinoma: a distinctive histologic subtype with prognostic significance. Case series.

The aims of the present work were to evaluate the prognostic significance of the micropapillary pattern of lung adenocarcinoma and determine whether there are differences in the behavior of this type of tumor according to its immunohistochemical profile. A series of 191 consecutively resected pulmonary adenocarcinomas were divided into those with (n = 62) and those without (n = 129) micropapillary components. The disease was stage I in 38 and 54 patients, respectively.