tailieunhanh - Báo cáo hóa học: "One Step Nucleic Acid Amplification (OSNA) - a new method for lymph node staging in colorectal carcinomas"

One Step Nucleic Acid Amplification (OSNA) - a new method for lymph node staging in colorectal carcinomas | Croner et al. Journal of Translational Medicine 2010 8 83 http content 8 1 83 JOURNAL OF TRANSLATIONAL MEDICINE METHODOLOGY Open Access One Step Nucleic Acid Amplification OSNA - a new method for lymph node staging in colorectal carcinomas 1 1 1 1 2 Roland S Croner Vera Schellerer Helene Demund Claus Schildberg Thomas Papadopulos E I i r k z-xt- l I r r ZZI r3 C f i I r-71 3 I 1 -s I I r E s4- 7 - 1 A xmnr I_I p r p xr A E z p I p K lzz A r 1 14 Elisabeth Naschberger Michael Sturzl Klaus E Matzel Werner Hohenberger Anne schlabraKowsKi Abstract Background Accurate histopathological evaluation of resected lymph nodes LN is essential for the reliable staging of colorectal carcinomas CRC . With conventional sectioning and staining techniques usually only parts of the LN are examined which might lead to incorrect tumor staging. A molecular method called OSNA One Step Nucleic Acid Amplification may be suitable to determine the metastatic status of the complete LN and therefore improve staging. Methods OSNA is based on a short homogenisation step and subsequent automated amplification of cytoKeratin 19 CK19 mRNA directly from the sample lysate with result available in 30-40 minutes. In this study 184 frozen LN from 184 patients with CRC were investigated by both OSNA and histology Haematoxylin Eosin staining and CK19 immunohistochemistry with half of the LN used for each method. Samples with discordant results were further analysed by RT-PCR for CK19 and carcinoembryonic antigen CEA . Results The concordance rate between histology and OSNA was . Three LN were histology OSNA- and 5 LN histology- OSNA . RT-PCR supported the OSNA result in 3 discordant cases suggesting that metastases were exclusively located in either the tissue analysed by OSNA or the tissue used for histology. If these samples were excluded the concordance was the sensitivity and the specificity . Three patients 3 staged as UICC I or II by routine .

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