Transcriptional profiling of oral squamous cell carcinoma using formalin-fixed paraffin-embedded samples

Saleh, A.; Zain, R.B.; Hussaini, H.; Ng, F.; Tanavde, V.; Hamid, S.; Chow, A.T.; Lim, G.S.; Abraham, M.T.; Teo, S.H.; Cheong, S.C. (2010) Transcriptional profiling of oral squamous cell carcinoma using formalin-fixed paraffin-embedded samples. Oral Oncology, 46 (5). pp. 379-386. ISSN 1368-8375

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      Despite the advances in cancer treatment, the 5-year survival rate for oral cancer has not changed significantly for the past 40 years and still remains among the worst of all anatomic sites. Gene expression microarrays have been used successfully in the identification of genetic alterations in cancer development, however, these have hitherto been limited by the need for specimens with good quality intact RNA. Here, we demonstrated the use of formalin-fixed paraffin-embedded tissues in microarray experiments to identify genes differentially expressed between cancerous and normal oral tissues. Forty-three tissue samples were macrodissected and gene expression analyses were conducted using the Illumina DASL assay. We report RNA yield of 2.4 and 0.8 μg/mm3 from tumour and normal tissues, respectively and this correlated directly with the tissue volume used for RNA extraction. Using unsupervised hierarchical clustering, distinct gene expression profiles for tumour and normal samples could be generated, and differentially expressed genes could be identified. The majority of these genes were involved in regulation of apoptosis and cell cycle, metastasis and cell adhesion including BCL2A1, BIRC5, MMP1, MMP9 and ITGB4. Representative genes were further validated in independent samples suggesting that these genes may be directly associated with oral cancer development. The ability to conduct microarrays on formalin-fixed paraffin-embedded specimens represents a significant advancement that could open up avenues for finding genes that could be used as prognostication and predictive tools for cancer. © 2010 Elsevier Ltd. All rights reserved.

      Item Type: Article
      1. Saleh, A.
      2. Zain, R.B.(Department of Oral Pathology and Oral Medicine and Periodontology, Faculty of Dentistry, University of Malaya)
      3. Hussaini, H.
      4. Ng, F.
      5. Tanavde, V.
      6. Hamid, S.
      7. Chow, A.T.
      8. Lim, G.S.
      9. Abraham, M.T.
      10. Teo, S.H.
      11. Cheong, S.C.
      Journal or Publication Title: Oral Oncology
      Additional Information: Cited By (since 1996): 6 Export Date: 7 December 2011 Source: Scopus Times Cited: 7 Saleh, A. Zain, R. B. Hussaini, H. Ng, F. Tanavde, V. Hamid, S. Chow, A. T. Lim, G. S. Abraham, M. T. Teo, S. H. Cheong, S. C.
      Uncontrolled Keywords: Formalin-fixed paraffin-embedded tissues ; Gene expression profiling ; Microarray ; Oral squamous cell carcinoma
      Subjects: R Medicine > RK Dentistry > Oral surger
      Divisions: Faculty of Dentistry > Dept of Oral Pathology & Oral Medicine & Periodontology
      Depositing User: Prof. Dr. Rosnah Mohd Zain
      Date Deposited: 02 Feb 2012 17:11
      Last Modified: 10 Dec 2013 13:07

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