title: Papillary adenocarcinoma of the lung is a more advanced adenocarcinoma than bronchioloalveolar carcinoma that is composed of two distinct histological subtypes.
abstract: To clarify the clinicopathological nature of papillary adenocarcinoma (PA) of the lung, 20 cases of PA were collected consecutively from resected adenocarcinoma of the lung, studied immunohistochemically and, using molecular techniques, compared with bronchioloalveolar carcinoma (BAC). Clinicopathologically, PA occurred in 7.4% and dominantly in female patients. Morphologically, PA was divided into two subtypes according to the presence of residual alveolar structures, detected by elastica van Gieson stain. One of these subtypes was closely related to the morphology of BAC and might be diagnosed as adenocarcinoma with mixed subtypes. The other PA subtype was composed of tall columnar cells and grew compressively, which was similar to type F adenocarcinoma previously reported by Noguchi et al. Immunohistochemical studies using lung tissue-specific antigens, progression markers and tumor suppressor products found that PA seemed a more advanced adenocarcinoma than BAC, but no differences were observed among PA subtypes. Molecular biological analysis using three microsatellite markers at chromosome 3p revealed more frequent loss of heterozygosity in PA than BAC, with no differences among PA subtypes. These findings suggest that PA is a more advanced adenocarcinoma subtype than BAC. Further investigations are needed to clarify true PA as clinicopathologically and biologically independent from other histological subtypes of adenocarcinoma of the lung.
authors.affiliation: Department of Tumor Pathology, Gunma University Graduate School of Medicine, Maebashi, Japan.
authors.forename: Zhang
authors.initials: Z
authors.lastname: Jian
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Tomizawa
authors.forename: Noriko
authors.initials: N
authors.lastname: Yanagitani
authors.forename: Hironobu
authors.initials: H
authors.lastname: Iijima
authors.forename: Takaaki
authors.initials: T
authors.lastname: Sano
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakajima
mesh_terms: D002282:Adenocarcinoma, Bronchiolo-Alveolar / Q000737:chemistry / Q000145:classification / Q000235:genetics / Q000473:pathology*; D000231:Adenocarcinoma, Papillary / Q000737:chemistry / Q000145:classification / Q000235:genetics / Q000473:pathology*; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000032:analysis; D002893:Chromosomes, Human, Pair 3 / Q000235:genetics; D004273:DNA, Neoplasm / Q000032:analysis; D005260:Female; D005819:Genetic Markers / Q000235:genetics; D006801:Humans; D007124:Immunoenzyme Techniques; D019656:Loss of Heterozygosity; D008175:Lung Neoplasms / Q000737:chemistry / Q000235:genetics / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011013:Pneumonectomy; D016133:Polymerase Chain Reaction
chemical_list: D014408:Biomarkers, Tumor; D004273:DNA, Neoplasm; D005819:Genetic Markers