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Heterogeneity of gene expression profiles in head and neck cancer

✍ Scribed by Jimmy Pramana; Nuno Pimentel; Ingrid Hofland; Lodewijk F. A. Wessels; Marie-Louise F. van Velthuysen; Douwe Atsma; Coen R. N. Rasch; Michiel W. M. van den Brekel; Adrian C. Begg

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
158 KB
Volume
29
Category
Article
ISSN
1043-3074

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Background.

Results of gene expression profiling studies from different institutes often lack consistency. This could be due to the use of different microarray platforms and protocols, or to intratumoral heterogeneity in mRNA expression. The aim of our study was to quantify intratumoral heterogeneity in head and neck cancer.

Methods.

Forty‐four fresh frozen biopsies were taken from 22 patients, 2 per tumor. RNA was extracted, tested for quality, amplified, labeled, and hybridized to a 35k oligoarray.

Results.

Unsupervised clustering analyses using all genes, the most variable genes, or random gene sets showed that 80% to 90% of biopsy pairs clustered together. A within‐pair‐between‐pair scatter ratio analysis showed that the similarity between matching pairs was significantly greater than that between random pairs (p <.00001).

Conclusions.

Two biopsies from the same tumor show far greater similarity in gene expression than biopsies from different tumors, supporting the use of 1 biopsy for expression profiling. Β© 2007 Wiley Periodicals, Inc. Head Neck 2007

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