title: Involvement of 2p23 in pulmonary inflammatory pseudotumors.
abstract: Pulmonary inflammatory pseudotumors (IP) are rare mesenchymal proliferations that have a polymorphic histology and an unpredictable biologic behavior. The histologic spectrum of IP has led to uncertainty as to whether this tumor has a reactive or neoplastic pathogenesis. Reports of extrapulmonary IP have identified clonal chromosomal aberrations involving 2p23 in the region of the ALK gene. Using fluorescence in situ hybridization with a probe flanking the ALK gene at 2p23 and immunostaining for the ALK gene product, we studied formalin-fixed, paraffin-embedded tissues of pulmonary IP and found a subset (33%) with 2p23 aberrations. We suggest that chromosomal rearrangements and ALK immunostaining may be helpful in the diagnosis of a group of pulmonary IP and should be investigated as a potential tool for predicting their future biologic behavior. An association with anaplastic large-cell lymphoma was also observed. HUM PATHOL 32:428-433.
authors.affiliation: Department of Pathology, University of Pittsburgh Medical Center-Presbyterian University Hospital, Pittsburgh, PA 15213, USA.
authors.forename: S A
authors.initials: SA
authors.lastname: Yousem
authors.forename: H
authors.initials: H
authors.lastname: Shaw
authors.forename: K
authors.initials: K
authors.lastname: Cieply
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000077548:Anaplastic Lymphoma Kinase; D002648:Child; D002869:Chromosome Aberrations; D002889:Chromosomes, Human, Pair 2; D005260:Female; D006801:Humans; D008297:Male; D016726:Plasma Cell Granuloma, Pulmonary / Q000235:genetics* / Q000473:pathology; D011505:Protein-Tyrosine Kinases / Q000235:genetics*; D020794:Receptor Protein-Tyrosine Kinases
chemical_list: C000626173:ALK protein, human; D000077548:Anaplastic Lymphoma Kinase; D011505:Protein-Tyrosine Kinases; D020794:Receptor Protein-Tyrosine Kinases