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We evaluated 11 adenocarcinoma samples, all of which demonstrated neoplastic cell enrichment using touch imprint. Eleven adenocarcinomas with known KRAS oncogene mutations were studied: 2 primary colorectal http://www.selleckchem.com/products/Metformin-hydrochloride(Glucophage).html carcinomas (CRCs), 3 liver metastases of CRCs, 1 lung metastasis of a CRC, 2 adenocarcinomas of the lung, and 3 ductal adenocarcinomas of the pancreas. Tumor specimens were processed under a waiver of authorization approved by the Memorial Sloan-Kettering Cancer Center Institutional Review Board. A single 1.0 cm �� 1.0 cm �� 0.3 cm fresh tumor sample was cut, avoiding surrounding normal tissue and necrotic areas (if possible). Two sets of 10 touch imprint slides were prepared as follows. Each of the 20 slides was prepared by dabbing the cut surface of the tissue against uncharged glass slides to cover at least 60% of the slide surface. The slide was immediately immersed in cold 95% ethanol, and after the last slide was prepared, they were fixed in ethanol for 5 minutes. The first and the last slide in each set (ie, slides 1 and 10) were stained with hematoxylin and eosin (H&E) to ensure the presence of tumor cells, and the remaining 8 slides (ie, slides 2-9) were air-dried and saved to be used for DNA extraction. Touch imprint slides were stored at room temperature for 1 to 8 months before DNA extraction. A matched fresh tumor sample (without major areas of normal tissue) was embedded in OCT, frozen in liquid nitrogen, and stored at ?20 C degrees to be used to prepare 1 control http://www.selleckchem.com/products/BIBF1120.html H&E slide and for DNA extraction. Frozen tissue was diced with a blade into pieces measuring? http://www.selleck.cn/products/carfilzomib-pr-171.html 12 and 13 were detected by standard polymerase chain reaction (PCR) sequencing. PCR amplification of a 224-base pair fragment including the entire coding region of exon 2 was performed using HotStar Taq DNA polymerase (Qiagen) and appropriate primers (KRAS2/E2intF: 5��-GTG TGA CAT GTT CTA ATA TAG TCA-3�� and KRAS2/E2extR: 5��-CTG TAT CAA AGA ATG GTC CTG CAC-3��).[10] In case 11, a PCR was also performed using standard primers in conjunction with a 10-mer locked nucleic acid (LNA) oligonucleotide to suppress amplification of the wild-type DNA, as previously described.[11] All PCR amplifications were run in duplicate for each sample. The PCR products were sequenced using the BigDye Terminator v3.