Linked Life Data

18788887

Source:http://linkedlifedata.com/resource/pubmed/id/18788887

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2009-10-5
pubmed:abstractText
Immunohistochemical staining for anaplastic lymphoma kinase (ALK) has been described in rhabdomyosarcomas (RMS), especially the alveolar subtype. Previous studies have yielded conflicting results regarding the pattern of staining (nuclear versus cytoplasmic), and there has been no correlation with PAX3-7/FKHR fusion status. This study was undertaken to evaluate ALK receptor protein expression in a large series of RMS; to correlate these results with fusion status; and to investigate the possibility of 2p23 amplification or translocation using fluorescence in situ hybridization (FISH). Sixty-nine cases of RMS were examined and classified as alveolar RMS (ARMS), embryonal RMS (ERMS), or unclassifiable RMS (URMS) subtypes. Anaplastic lymphoma kinase immunohistochemistry was performed using anti-human CD246 antibody; cases were considered positive when more than 50% of cells had moderate or intense cytoplasmic and/or nuclear staining. There were 30 ARMS, 37 ERMS, and 2 URMS subtypes. Reverse transcription-polymerase chain reaction for PAX3/PAX7-FKHR fusion analysis had been done in all cases of ARMS, in 27 of 37 cases of ERMS, and in both URMS cases. Anaplastic lymphoma kinase staining was positive in 16 of 30 ARMS (53%) and 9 of 39 nonalveolar RMS (23%) cases (P < 0.05). Of the 21 ARMS cases with PAX3-FKHR fusion, 10 of 21 (48%) were positive for ALK staining; of the 6 ARMS cases with PAX7-FKHR fusion, 3 of 6 (50%) were positive for ALK staining; and 3 of 3 (100%) of the fusion-negative ARMS were positive with ALK staining. When comparing each of the ARMS subtypes, statistical significance was not reached. All positive cases showed dot-like cytoplasmic staining; nuclear staining was not seen. Of a subset of 6 ALK-positive ARMS submitted for break-apart FISH for the ALK locus, there was no evidence of a translocation; 1 case had ALK amplification and 2 had low-level gains of the ALK gene. We conclude that there is ALK overexpression in RMS, more commonly in ARMS than in ERMS, most likely independent of fusion status. Amplification or upregulation of ALK may underlie ALK protein overexpression.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1093-5266
pubmed:author
pubmed:issnType
Print
pubmed:volume
12
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
275-83
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed-meshheading:18788887-Adolescent, pubmed-meshheading:18788887-Child, pubmed-meshheading:18788887-Child, Preschool, pubmed-meshheading:18788887-Female, pubmed-meshheading:18788887-Gene Expression, pubmed-meshheading:18788887-Humans, pubmed-meshheading:18788887-Immunohistochemistry, pubmed-meshheading:18788887-In Situ Hybridization, Fluorescence, pubmed-meshheading:18788887-Infant, pubmed-meshheading:18788887-Male, pubmed-meshheading:18788887-Oncogene Proteins, Fusion, pubmed-meshheading:18788887-PAX7 Transcription Factor, pubmed-meshheading:18788887-Protein-Tyrosine Kinases, pubmed-meshheading:18788887-Receptor Protein-Tyrosine Kinases, pubmed-meshheading:18788887-Reverse Transcriptase Polymerase Chain Reaction, pubmed-meshheading:18788887-Rhabdomyosarcoma, Alveolar, pubmed-meshheading:18788887-Rhabdomyosarcoma, Embryonal, pubmed-meshheading:18788887-Tumor Markers, Biological
pubmed:articleTitle
ALK expression in rhabdomyosarcomas: correlation with histologic subtype and fusion status.
pubmed:affiliation
Department of Pathology, A. I. DuPont Hospital for Children, Wilmington, DE, USA. dcorao@nemours.org
pubmed:publicationType
Journal Article