Identification of carboxypeptidase E and γ-glutamyl hydrolase as biomarkers for pulmonary neuroendocrine tumors by cDNA microarray

Ping He, Lyuba Varticovski, Elise D. Bowman, Junya Fukuoka, Judith A. Welsh, Koh Miura, Jin Jen, Edward Gabrielson, Elisabeth Brambilla, William D. Travis, Curtis C. Harris

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Pulmonary neuroendocrine tumors vary dramatically in their malignant behavior. Their classification, based on histological examination, is often difficult. In search of molecular and prognostic markers for these tumors, we used cDNA microarray analysis of human transcripts against reference RNA from a well-characterized immortalized bronchial epithelial cell line, BEAS-2B. Tumor cells were isolated by laser-capture microdissection from primary tumors of 17 typical carcinoids, small cell lung cancers, and large cell neuroendocrine carcinomas. An unsupervised, hierarchical clustering algorithm resulted in a precise classification of each tumor subtype according to the proposed histological classification. Selection of genes, using supervised analysis, resulted in the identification of 198 statistically significant genes (P <.004) that also accurately discriminated between 3 predefined tumor subtypes. Two-by-two comparisons of these genes identified classifier genes that distinguished each tumor subtype from the others. Changes in expression of selected differentially expressed genes for each tumor subtype were internally validated by real-time reverse-transcription polymerase chain reaction. Expression of 2 potential classifier gene products, carboxypeptidase E (CPE) and γ-glutamyl hydrolase (GGH), was validated by immunohistochemistry and cross-validated on additional archival samples of pulmonary neuroendocrine tumors. Kaplan-Meier survival analysis revealed that immunostaining for CPE was a statistically significant predictor of good prognosis, whereas GGH expression correlated with poor prognosis. Thus, cDNA microarray analysis led to the identification of 2 novel biomarkers that should facilitate molecular diagnosis and further study of pulmonary neuroendocrine tumors.

Original languageEnglish (US)
Pages (from-to)1196-1209
Number of pages14
JournalHuman Pathology
Volume35
Issue number10
DOIs
StatePublished - Oct 2004
Externally publishedYes

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Carboxypeptidase H
Neuroendocrine Tumors
Hydrolases
Oligonucleotide Array Sequence Analysis
Biomarkers
Lung
Genes
Neoplasms
Microarray Analysis
Laser Capture Microdissection
Neuroendocrine Carcinoma
Large Cell Carcinoma
Small Cell Lung Carcinoma
Carcinoid Tumor
Kaplan-Meier Estimate
Survival Analysis
Tumor Biomarkers
Reverse Transcription
Cluster Analysis
Epithelial Cells

Keywords

  • γ-glutamyl hydrolase
  • ABC
  • AC
  • atypical carcinoid
  • avidin-biotin-peroxidase complex
  • biomarkers
  • carboxypeptidase E
  • CPE
  • gene pulmonary neuroendocrine tumors
  • GGH
  • IHC
  • immunohistochemistry

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

Cite this

Identification of carboxypeptidase E and γ-glutamyl hydrolase as biomarkers for pulmonary neuroendocrine tumors by cDNA microarray. / He, Ping; Varticovski, Lyuba; Bowman, Elise D.; Fukuoka, Junya; Welsh, Judith A.; Miura, Koh; Jen, Jin; Gabrielson, Edward; Brambilla, Elisabeth; Travis, William D.; Harris, Curtis C.

In: Human Pathology, Vol. 35, No. 10, 10.2004, p. 1196-1209.

Research output: Contribution to journalArticle

He, P, Varticovski, L, Bowman, ED, Fukuoka, J, Welsh, JA, Miura, K, Jen, J, Gabrielson, E, Brambilla, E, Travis, WD & Harris, CC 2004, 'Identification of carboxypeptidase E and γ-glutamyl hydrolase as biomarkers for pulmonary neuroendocrine tumors by cDNA microarray', Human Pathology, vol. 35, no. 10, pp. 1196-1209. https://doi.org/10.1016/j.humpath.2004.06.014
He, Ping ; Varticovski, Lyuba ; Bowman, Elise D. ; Fukuoka, Junya ; Welsh, Judith A. ; Miura, Koh ; Jen, Jin ; Gabrielson, Edward ; Brambilla, Elisabeth ; Travis, William D. ; Harris, Curtis C. / Identification of carboxypeptidase E and γ-glutamyl hydrolase as biomarkers for pulmonary neuroendocrine tumors by cDNA microarray. In: Human Pathology. 2004 ; Vol. 35, No. 10. pp. 1196-1209.
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AU - Welsh, Judith A.

AU - Miura, Koh

AU - Jen, Jin

AU - Gabrielson, Edward

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AU - Travis, William D.

AU - Harris, Curtis C.

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