Genetic heterogeneity in patients with multiple neoplastic lung lesions: A report of three cases

Mariëlle I.Gallegos Ruiz, Hester Van Cruijsen, Egbert F. Smit, Katrien Grünberg, Gerrit A. Meijer, José A. Rodriguez, Bauke Ylstra, Giuseppe Giaccone*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

INTRODUCTION: It is important to determine the relation among the various lesions in patients presenting with multiple malignant lung tumors to define the best treatment approach. A better understanding of the molecular alterations present in the different lesions may help in defining this relation. METHODS: We performed a detailed molecular analysis of several tumor specimens obtained from three patients presenting with multiple lung lesions. Tumor specimens were analyzed for epidermal growth factor receptor (EGFR) and k-ras mutations by direct DNA sequencing. In addition, a genome-wide chromosomal copy number analysis was performed on DNA extracted from the various lesions using array-based comparative genomic hybridization. RESULTS: In one case, a deletion of 15 base pairs in exon 19 of EGFR was present in all tumor sites analyzed. Furthermore, a similar pattern of chromosomal aberrations was observed among the various lesions, suggesting that they share the same clonal origin. In the other two cases, in contrast, we identified distinct k-ras genotypes among the various lesions from the same patient. These lesions, moreover, showed different chromosomal aberration patterns, indicating that they may have different underlying pathways of tumorigenesis. CONCLUSION: Our results show that EGFR and k-ras mutation analysis, combined with chromosomal copy number profiling, can help in defining the relationship among different tumors in one patient.

Original languageEnglish
Pages (from-to)12-21
Number of pages10
JournalJournal of Thoracic Oncology
Volume2
Issue number1
Publication statusPublished - 1 Jan 2007

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