Advances in Technology
KRAS testing on colo-rectal carcinoma cytological imprints
Article first published online: 6 JUL 2010
Copyright © 2010 Wiley-Liss, Inc.
Volume 39, Issue 4, pages 274–277, April 2011
How to Cite
Malapelle, U., Bellevicine, C., Russo, A., Salatiello, M., Palombini, L., Troncone, G. (2011), KRAS testing on colo-rectal carcinoma cytological imprints. Diagn. Cytopathol., 39: 274–277. doi: 10.1002/dc.21417
- Issue published online: 17 MAR 2011
- Article first published online: 6 JUL 2010
- Manuscript Accepted: 18 MAR 2010
- Manuscript Received: 29 DEC 2009
- Regione Campania “Nuovi marcatori molecolari nella diagnosi citologica” grant
- colo-rectal cancer;
- polymnerase chain reaction;
Anti-EGFR monoclonal antibodies, cetuximab, and panitumumab, are administrated under the condition that advanced colo-rectal cancer (CRC) carries a wild-type KRAS gene. Thus, clinicians request pathologists to genotype KRAS before treatment. In the near future routine mutation testing at the same time of the surgery may be implemented. The reliability of a rapid KRAS testing on ex vivo cytological samples obtained by direct scraping of the colon tumour tissue is here evaluated. A consecutive series of 20 surgically resected, primary CRC specimens was analysed. Fresh tissue from CRC was scraped with a scalpel blade, smeared on uncoated glass slides, air-dried and Diff–Quik stained to ensure malignant cell presence. The same tissue area was also histologically processed. Exon 2 KRAS gene mutations were evaluated on both cytological and histological specimens by dideoxy sequencing and by the DxS KRAS Mutation Test Kit (DxS, Manchester, England). Data obtained on on imprint cytology and matched histological samples showed full concordance; however, the mutation frequency was slightly higher (35%) by the DxS KRAS Mutation Test Kit than by the dideoxy sequencing (30%). Thus, colon cancer imprint cytology sample is a reliable biospecimen for both dideoxy-sequencing and DxS KRAS Mutation Test Kit analysis and it may be useful to abbreviate the KRAS assay turnaround time. Diagn. Cytopathol. 2011;39:274–277. ©2010 Wiley-Liss, Inc.