Anti-CDX2 (Internal) monoclonal antibody, clone 8E0.2

Background: To establish one primary cell line of human liver metastasis of colon cancer. Methods: HCS1220 cell line was derived from one liver metastasis of colon cancer patient's resected tumor sample. The characterization of the cell line was defined by karyotype analysis, short tandem repeat (STR) analysis and mycoplasma contamination. Subcutaneous injection 1 x 10(6) cells to four BALB/c nude mice, the viable tumors were developed and diagnosed (H&E staining). The expression of biomarkers CK20 and CDX2 for colon cancer were determined by immunocytochemistry assay. Results: HCS1220 cell line can grow stably and continuously passage. During the grow process, the contact loss in the growth process and superimposed growth, which could be defined as proliferation of malignant tumor. Chromosome analysis revealed the cells derived from human female. The cells were not contaminated by mycoplasma. By immunohistochemistry, the cell line was proven to express the biomarkers of colon cancer CK20 and CDX2, while a-fetoprotein, hep-1 and glypican-3 were stained negative, which demonstrated that the HCS1220 cell line originating from the intestinal tissue. Conclusions: HCS1220 cell line has the characteristics of primary human liver metastasis of colon cancer. The results of STR have genetically showed that cell line is original, which can provided cell materials for research in vitro and can also help for establishing the mechanism model of liver metastasis of colon cancer and preparing, screening and evaluating anti-tumor drugs.

Background: In colorectal cancer (CRC) patients, pulmonary nodules are usually considered lung metastases (LM). However, approximately 10% of LM is presented as a solitary pulmonary nodule which mimics primary lung cancer (PLC). This study aims to determine the distinguishing characteristics of the two pulmonary nodule types during postoperative surveillance of CRC patients. Methods: Between March 2009 and February 2018, 47 CRC patients with pulmonary nodules from a single institution were retrospectively analyzed. They were divided into two groups, namely CRC with second PLC (CSPLC) and CRC with LM (CRCLM), and their demographic data and clinicopathological features were analyzed. Results: When pulmonary nodules are presented, multiple lesions and serum carcinoembryonic antigen (CEA) level >5 ng/mL indicated a higher probability of CRCLM (p < 0.001 and p = 0.028, respectively). A CK7(-)/CK20(+)/CDX2(+)/TTF-1(-) phenotype on immunohistochemistry (IHC) stain suggested CRCLM. Other clinicopathological features showed no significant between-group differences. The median overall survival was considerably longer in the CSPLC group (not reached) than in the CRCLM group (45.41 months, p = 0.064). Conclusions: The detection of a suspicious isolated pulmonary nodule in CRC patients warrants further workup to distinguish between SPLC and LM. Multiple lesions, serum CEA >5 ng/mL when an isolated pulmonary nodule detected, and initial TNM stage IV CRC are more likely related to LM rather than SPLC. Image-guided needle biopsy and IHC stain can reduce the probability of misdiagnosis and rule out LM. CSPLC may have a favorable prognosis owing to early detection and receiving appropriate treatment. (C) 2018 Asian Surgical Association and Taiwan Robotic Surgery Association. Publishing services by Elsevier B.V.