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In the omics era, the development of high-throughput technologies that permit the solution of deciphering cancer from higher dimensionality provides a knowledge base that changes the face of cancer understanding and therapeutics (Cho, 2010b). Serum is one of the most easily procured patient specimens and it is perceived to contain many of the molecules that might indicate systemic function. Thus, serum is the sample source that is most often profiled in the hopes of identifying sets of biomarkers for clinical use (Gilbert et al, 2004). In this study, proteomic analyses of serum samples from patients with lung cancer and controls have identified SAA as an elevated biomarker in lung cancer (as shown by SELDI analysis and confirmed by immunoassay). It is known that SAA is secreted during the acute phase of inflammation; the conservation of this protein throughout invertebrates and vertebrates suggests that SAA has an essential role in all animals including humans (Manley et al, 2006). There are several functions of SAA protein, describedin the context of inflammation, that are compatible with the mechanism of tumour invasion and metastasis. These properties place SAA as an extracellular matrix-associated adhesion protein with a potential role in tumour pathogenesis. The SAA mRNA expression in epithelial cells was gradually increased as they progressed through different stages of dysplasia to overt carcinoma (Gutfeld et al, 2006). Accumulating evidence has suggested that SAA might be used to detect a pattern of physiological events that reflect the growth of malignancy and host response. Elevated SAA may be a primary product of tumour lesions, but can also be the product of hepatocytes. Further investigation to determine whether cancer tissue-derived cytokines stimulate SAA synthesis in liver or epithelial cells will be interesting (Malle et al, 2009). Overexpression of SAA has been reported in nasopharyngeal, renal, gastric, hepatocellular, melanoma, breast, and endometrial cancers (Cho et al, 2004; Tolson et al, 2004; Chan et al, 2007; He et al, 2008; Findeisen et al, 2009; Pierce et al, 2009; Ramankulov et al, 2008; Cocco et al, 2009, 2010; Sasazuki et al, 2010; Vermaat et al, 2010). Our study not only detected increased SAA level in the serum of lung cancer patients but also identified that elevated SAA level may be a non-invasive biomarker, useful for the prediction of lung cancer prognosis. As far as we know, the association of SAA with the survival of lung cancer patients has never been reported. Moreover, a number of SELDI peaks were found to be significantly differentiated between the serum of cancer patients and controls, as well as between the poor prognosis patients and good prognosis patients. Further identification of these peaks is awaiting. Recently, the US Food and Drug Administration has approved an ovarian cancer triage test called OVA1, containing CA125 and four biomarkers (b2-microglobulin, transferrin, apolipoprotein A1, and transthyretin) identified by SELDI-TOF-MS (Fung, 2010). This marks an encouraging step of translating biomarker discovery from laboratory to clinic. It showed that having identified biomarkers by primary screening, a standard assay may then be developed and finally converted into clinically applicable measures. Our results reveal that the level of SAA is highly elevated in lung cancer and in the patients with poor prognosis, thus warranting further studies investigating this candidate biomarker as part of a multimarker test for the diagnosis and prognosis of lung cancer. 医学系論文の一部です。 わかるところだけでも翻訳いただけると助かります。
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これは論文のイントロですか?。ところで全訳が必要なのでしょうか?全訳は回答者の負担になるため、何のために翻訳が必要であるか等も記載がないと協力やアドバイスも難しいように思われます。目的によっては、かなり大雑把な意訳でもいいわけで、極端なことを言えばこれからSAAが肺がんのバイオマーカーとして有用であるというデータの提示がなされるということだけ理解できればいいわけです。あとは、SAAに関しての過去の報告例えばSAA が炎症やがんの悪性度の進展に関わることなどを押さえていればよいかと思います。