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Navaglia F, Fogar P, Greco E, Basso D, Stefani AL, Mazza S, Zambon CF, Habeler W, Altavilla G, Amadori A, Cecchetto A, Plebani M. CD44v10: An Antimetastatic Membrane Glycoprotein for Pancreatic Cancer. Int J Biol Markers 2018; 18:130-8. [PMID: 12841682 DOI: 10.1177/172460080301800206] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Aims The aims of this study were 1) to investigate the mRNA pattern of CD44 variants in three primary (MIA PaCa 2, PANC-1, PSN-1) and two metastatic (CAPAN-1, SUIT-2) pancreatic cancer (PC) cell lines; 2) to ascertain whether the genetic transfer of CD44s and CD44v10 modifies the adhesion of PC cells to the extracellular matrix (ECM) in vitro and their metastatic behavior in vivo. Methods CD44 mRNA analysis was done by means of RT-PCR. Adhesion to ECM the was assessed using coated microtiter plates. For the study of CD44v10 insertion in the CAPAN-1 line, liposome-mediated DNA transfer was used. SCID mice were employed for in vivo experiments. Results CD44v10 mRNA was not expressed by the CAPAN-1 nor by four of the six SUIT-2-derived clones. The stable expression of CD44v10 by modified CAPAN-1 significantly enhanced fibronectin adhesion. Mice without either liver or pancreatic metastases were more frequently found among the animals injected with modified (CD44v10 expressing) than with non-modified CAPAN-1. Conclusions 1) It is possible to differentiate between metastatic and non-metastatic PC cells on the basis of CD44v10 expression; 2) CD44v10 seems to be involved in mediating fibronectin adhesion in vitro and in counteracting metastases in vivo.
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Affiliation(s)
- F Navaglia
- Department of Laboratory Medicine, University of Padua, Padua, Italy
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Kawano Y, Iwama E, Tsuchihashi K, Shibahara D, Harada T, Tanaka K, Nagano O, Saya H, Nakanishi Y, Okamoto I. CD44 variant-dependent regulation of redox balance in EGFR mutation-positive non-small cell lung cancer: A target for treatment. Lung Cancer 2017; 113:72-78. [PMID: 29110853 DOI: 10.1016/j.lungcan.2017.09.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 08/23/2017] [Accepted: 09/14/2017] [Indexed: 01/12/2023]
Abstract
OBJECTIVES The regulation of redox balance in cancer cells is an important factor in tumor development and chemoresistance, with oncogene activation having been shown to induce the generation of reactive oxygen species (ROS). Activating mutations of the epidermal growth factor receptor gene (EGFR) are oncogenic drivers in non-small cell lung cancer (NSCLC), but it has remained unknown whether ligand-independent EGFR signaling conferred by EGFR mutation triggers ROS generation in NSCLC cells. MATERIALS AND METHODS HEK293T cells were transfected with an expression vector for mutant EGFR. The expression of CD44 variant (CD44v) isoforms in NSCLC cell lines was evaluated by flow cytometry. Cells were depleted of CD44v by RNA interference and assayed for ROS and glutathione (GSH) levels. The effect of CD44v on cisplatin sensitivity was evaluated in vitro with the MTS assay. RESULTS EGFR signaling due to EGFR mutation increased ROS levels in transfected HEK293T cells. The expression of CD44v isoforms was found to be inversely correlated with basal ROS levels in EGFR mutation-positive NSCLC cell lines. Knockdown of CD44v induced depletion of intracellular GSH and increased ROS levels in EGFR-mutated NSCLC cells that express CD44v at a high level (CD44vhigh). In addition, depletion of GSH by treatment with buthionine-[S, R]-sulfoximine induced marked accumulation of ROS and enhanced the cytotoxicity of cisplatin in CD44vhighEGFR-mutated NSCLC cells but not in corresponding CD44vlow cells. This enhancement of cisplatin cytotoxicity by GSH depletion was prevented by treatment with the antioxidant N-acetyl-l-cysteine. Knockdown of CD44v also enhanced cisplatin cytotoxicity in CD44vhighEGFR mutation-positive NSCLC cells but not in CD44vlow cells. CONCLUSION Our results thus implicate CD44v in redox adaptation and as a potential target for treatment in CD44vhighEGFR-mutated NSCLC cells.
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Affiliation(s)
- Yuko Kawano
- Research Institute for Diseases of the Chest, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Eiji Iwama
- Research Institute for Diseases of the Chest, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Kenji Tsuchihashi
- Department of Medicine and Biosystemic Science, Kyushu University Graduate School of Medical Sciences, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Daisuke Shibahara
- Research Institute for Diseases of the Chest, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Taishi Harada
- Research Institute for Diseases of the Chest, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Kentaro Tanaka
- Research Institute for Diseases of the Chest, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Osamu Nagano
- Division of Gene Regulation, Institute for Advanced Medical Research, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Hideyuki Saya
- Division of Gene Regulation, Institute for Advanced Medical Research, Keio University School of Medicine, 35 Shinano-machi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Yoichi Nakanishi
- Research Institute for Diseases of the Chest, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Isamu Okamoto
- Research Institute for Diseases of the Chest, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
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Wang Y, Liu Y, Xiao B. Rapid and reliable detection of CD44 variants in gastric carcinoma using a nested reverse transcription-polymerase chain reaction. Oncol Lett 2015; 10:2962-2966. [PMID: 26722272 DOI: 10.3892/ol.2015.3664] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Accepted: 03/27/2015] [Indexed: 01/09/2023] Open
Abstract
The present study aimed to establish a rapid and reliable method for detecting the expression of cluster of differentiation 44 variant (CD44v) in gastric carcinoma, and to investigate the significance of CD44v in gastric carcinoma. Using a nested reverse transcription-polymerase chain reaction (RT-PCR) technique, the expression of CD44v and CD44v8-10 was analyzed in gastric cancer tissues (128 cases), precancerous lesions (19 cases of atypical hyperplasia and 6 cases of intestinal metaplasia) and corresponding adjacent non-cancerous tissues (153 cases). The tumor and non-cancerous biopsy samples of 153 patients were analyzed using nested RT-PCR. All the PCR products included bands at 482 bp, demonstrating positive CD44 expression. By contrast, the CD44v band (>600 bp) was observed in 132/153 total tumor samples (86.3%), including 114/128 gastric cancer samples (89.1%), 16/19 atypical hyperplasia samples (84.2%) and 2/6 intestinal metaplasia samples (33.3%). However, 18/153 non-cancerous tissues samples (11.8%) exhibited a CD44v band. Thus, CD44v expression was significantly higher in gastric cancer tissues and precancerous lesions compared with that of adjacent non-cancerous tissues (P<0.05). Furthermore, there was a significant difference in CD44v8-10 expression detected between gastric cancer and adjacent non-cancerous tissue samples (P<0.05). Among the 25 patients with precancerous lesions, 8/19 atypical hyperplasia cases and 1/6 intestinal metaplasia cases were positive for CD44v8-10 expression. The difference in the CD44v8-10 expression rate among the various pathological types of gastric cancer (n=128) cases was not significant (P>0.05). Additionally, immunohistochemical analysis identified CD44v positivity (++) in 59/76 (77.6%) cases of gastric cancer and 5/12 (41.1%) cases of atypical hyperplasia. The CD44v and CD44v8-10 PCR products were confirmed by sequencing analysis. The results of the present study indicated that nested RT-PCR technology may be exploited as a method for gastric carcinoma diagnosis.
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Affiliation(s)
- Yan Wang
- Department of Gastroenterology, Beijing Chao Yang Hospital Affiliated to Capital Medical University, Beijing 100020, P.R. China
| | - Yuhong Liu
- Department of Gastroenterology, Beijing Chao Yang Hospital Affiliated to Capital Medical University, Beijing 100020, P.R. China
| | - Bai Xiao
- Department of Experimental Medicine, Beijing Chao Yang Hospital Affiliated to Capital Medical University, Beijing 100020, P.R. China
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Simpson MA, Lokeshwar VB. Hyaluronan and hyaluronidase in genitourinary tumors. FRONT BIOSCI-LANDMRK 2008; 13:5664-80. [PMID: 18508614 DOI: 10.2741/3108] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Genitourinary cancers are the most frequently diagnosed cancers in men and the fifth most common in women. Management of disease through accurate and cost effective early diagnostic markers, as well as identification of valid prognostic indicators, has contributed significantly to improved treatment outcomes. In this review, we will discuss the function, regulation and clinical utility of hyaluronan (HA), genes encoding its metabolic enzymes and receptors that mediate its cellular effects. Specific HA synthase (HAS) and hyaluronidase (HAase) genes encode the enzymes that produce HA polymers and oligosaccharides, respectively. Differential effects of these enzymes in progression of genitourinary tumors are determined by the relative balance between HAS and HAase levels, as well as the distribution of receptors. The genes are regulated in a complex fashion at the transcriptional and post-translational levels, but also by epigenetic events, alternative mRNA splicing, and subcellular localization. Importantly, the major tumor-derived HAase enzyme, HYAL-1, either alone or together with HA, is an accurate diagnostic and prognostic marker for genitourinary tumors.
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Affiliation(s)
- Melanie A Simpson
- Department of Biochemistry, University of Nebraska, Lincoln, Nebraska, USA
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Wang G, Szeto CC. Quantification of gene expression in urinary sediment for the study of renal diseases. Nephrology (Carlton) 2007; 12:494-9. [PMID: 17803474 DOI: 10.1111/j.1440-1797.2007.00836.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Urinalysis has been used extensively in clinical practice to aid in the diagnosis of various renal diseases. With the advances in technology of molecular biology, gene expression and proteomic studies are now possible for urinary sediment. In this review article, we focus on the quantification of messenger RNA expression in urinary sediment by reverse-transcription and real-time quantitative polymerase chain reaction. Recently, this technique has been explored for three potential applications: (i) distinguishing the different causes of kidney disease; (ii) assessment of kidney disease activity, progression and response to therapy; and (iii) as a tool to study the pathogenesis. Although the method is simple and non-invasive, it requires further research to define the role in routine clinical practice. At this moment, the technique should only be considered experimental albeit promising.
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Affiliation(s)
- Gang Wang
- Department of Medicine & Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong, China
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Miyake H, Hara I, Kamidono S, Eto H. MULTIFOCAL TRANSITIONAL CELL CARCINOMA OF THE BLADDER AND UPPER URINARY TRACT: MOLECULAR SCREENING OF CLONAL ORIGIN BY CHARACTERIZING CD44 ALTERNATIVE SPLICING PATTERNS. J Urol 2004; 172:1127-9. [PMID: 15311055 DOI: 10.1097/01.ju.0000129541.23460.48] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE CD44 is a widely expressed cell surface adhesion molecule in which various isoforms arise from alternative RNA splicing mechanism during cancer initiation. We assessed whether multifocal transitional cell carcinoma of the urothelium is due to field change and/or intraluminal seeding and implantation. MATERIALS AND METHODS In a series of 24 patients with synchronous and/or metachronous multiple urothelial cancers we performed reverse transcription-polymerase chain reaction analysis using a set of primers capable of amplifying all CD44 splice variant isoforms. After polymerase chain reaction products were electrophoresed band intensities with areas corresponding to the major isoforms (that is CD44s, CD44v10 and CD44v8-10) were quantified, and CD44v10-to-CD44s and CD44v8-10-to-CD44s ratios were calculated. Moreover, p53 gene mutations in exons 4 to 11 were screened by direct DNA sequencing. RESULTS Of these 24 cases 18 showed similar CD44v10-to-CD44s and CD44v8-10-to-CD44s ratios in among multiple urothelial cancers in each case. However, in the remaining 6 cases these ratios were quite different among multiple cancer lesions. Furthermore, different types of p53 mutation were detected among multiple cancer lesions in only 2 of 24 cases, which also indicated different patterns of CD44 alternative splicing. CONCLUSIONS These findings suggest that at least some multiple transitional cell carcinomas of the urothelium seem to be of independent origin based on the analysis of alternative RNA splicing of CD44. Moreover, this hypothesis was further supported by the evaluation of p53 gene mutation.
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Affiliation(s)
- Hideaki Miyake
- Department of Urology, Hyogo Medical Center for Adults, 13-70 Kitaohji-cho, Akashi 673-8558, Japan
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Omara-Opyene AL, Qiu J, Shah GV, Iczkowski KA. Prostate cancer invasion is influenced more by expression of a CD44 isoform including variant 9 than by Muc18. J Transl Med 2004; 84:894-907. [PMID: 15107804 DOI: 10.1038/labinvest.3700112] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
The standard form of cell adhesion glycoprotein CD44 is a metastasis suppressor in prostate cancer. However, we previously showed by RT-PCR and Western blotting that cancer overexpresses unique CD44 variant v7-v10 isoforms. Muc18 is another cell adhesion marker reportedly overexpressed by prostate cancer. Matched frozen section-confirmed tumor and benign tissues were harvested from 10 prostatectomy specimens and tumor was microdissected from two lymph node metastases. Tissues were homogenized for RNA preparations, and RT-PCR was performed for the CD44v7-v10 sequence. In cultured prostate cancer cells, we caused RNA interference against CD44v9 and/or Muc18. We used PC3M cells and a derivative cell line called G(s)alpha, that constitutively expresses this G-protein and is more invasive. Lipofection was performed for a green fluorescent protein plasmid and for two 22-mer DNA fragments, cloned into a plasmid expression vector to generate hairpin, interfering dsRNA. Assays for invasion into Matrigel, a basement membrane matrix, were performed in 4-5 experiments. RT-PCR demonstrated expression of a 608 bp band representing CD44v7-v10 or a 638 bp band of CD44v6-v10 in prostate cancer tissues and metastases but not benign tissue. Cultured G(s)alpha cells overexpressed CD44v9 by comparison with PC3M cells. At 90 h after 6-hour lipofection, protein silencing was evident by Western blots. Silencing the CD44v9 expression reduced invasiveness into Matrigel to 21.6+/-7.0% in PC3M cells (P<0.001) and 31.2+/-18.3% in G(s)alpha cells (P=0.001), compared to cells exposed to transfection vehicle alone. Silencing Muc18 expression reduced invasiveness to 76.9+/-13.5% of the control value in PC3M cells (P<0.05) and 84.8+/-29.9% in G(s)alpha cells (P=0.18). Prostate cancer invasion is facilitated more by its overexpression of CD44 variant 9 than by Muc18. Its relative overexpression by G(s)alpha cells is a novel finding, suggesting a link between signal transduction and cell adhesion marker expression.
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Affiliation(s)
- Archangel Levi Omara-Opyene
- Department of Pathology, Immunology, and Laboratory Medicine, The University of Florida, Gainesville, FL, USA
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Irié T, Aida T, Aida M, Nagoshi Y, Tsuchiya R, Yamamoto G, Maeda Y, Saito M, Tachikawa T. Laser Pressure Cell Transfer Method: A New Microdissection Technique for Frozen Sections. ACTA ACUST UNITED AC 2004. [DOI: 10.3353/omp.9.53] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Tarou Irié
- Department of Oral Pathology, Showa University School of Dentistry
| | - Tadateru Aida
- Department of Oral Pathology, Showa University School of Dentistry
| | - Mina Aida
- Department of Oral Pathology, Showa University School of Dentistry
| | - Yuki Nagoshi
- Department of Oral Pathology, Showa University School of Dentistry
| | - Reiko Tsuchiya
- Department of Oral Pathology, Showa University School of Dentistry
| | - Gou Yamamoto
- Department of Oral Pathology, Showa University School of Dentistry
| | - Yukiko Maeda
- Department of Oral Pathology, Showa University School of Dentistry
| | - Masako Saito
- Department of Oral Pathology, Showa University School of Dentistry
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Abstract
Although the current system of classifying bladder cancer by stage and histological grade is very useful, it is still difficult to predict the natural progression of the disease either with or without therapy. Cystoscopy and urine cytology are currently the gold standards in the monitoring and diagnosis of bladder cancer. Classical urine cytology is, however, at least in the diagnosis of G1-tumors, characterized by a relatively low sensitivity. In the last few years, the molecular biological investigation of the basic mechanisms involved in carcinogenesis has provided a host of markers which are of potential diagnostic value for bladder cancer. We provide a current, comprehensive review of the literature on bladder tumor markers and summarize their diagnostic and prognostic potential. At present, no diagnostic marker with a comparable sensitivity and specificity to cystoscopy exists, given that cystoscopy has never been evaluated. The combined analysis of several tumor markers seems to be the most promising approach as an adjunct to cystoscopy. Moreover, the increasing simplification of test systems will increase their acceptance by clinicians.
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Affiliation(s)
- I Kausch
- Urologische Klinik und Poliklinik, Medizinische Universität zu Lübeck
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Gohji K, Kitazawa S. Molecular Mechanism of Prostate Cancer Invasion and Metastasis. Prostate Cancer 2003. [DOI: 10.1016/b978-012286981-5/50004-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Abstract
Smoking is directly responsible for approximately 90% of lung cancers and is also strongly associated with cancers of the head and neck, esophagus and urinary bladder. Our growing understanding of the molecular changes that underlie cancer progression has contributed to the development of novel molecular approaches for the detection of cancer. In this study, we review a number of recent studies that have used molecular techniques to detect neoplastic DNA from lung, head and neck, esophagus and bladder cancer. The majority of these approaches are based on polymerase chain reaction (PCR) based assays. These PCR-based techniques can detect a few clonal cancer cells containing a specific DNA mutation, microsatellite alteration, or CpG island methylation among an excess background of normal cells. The ability to accurately detect a small number of malignant cells in a wide range of clinical specimens including sputum, saliva, bronchoalveolar lavage fluid, urine, serum, plasma, or tissue has significant implications for screening high-risk individuals (such as cigarette smokers) for cancer.
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Affiliation(s)
- Ying Chuan Hu
- Department of Surgery, University of Rochester, 601 Elmwood Avenue, Rochester, New York, NY 14642, USA
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MIYAKE HIDEAKI, ETO HIROSHI, ARAKAWA SOICHI, KAMIDONO SADAO, HARA ISAO. OVER EXPRESSION OF CD44V8-10 IN URINARY EXFOLIATED CELLS AS AN INDEPENDENT PROGNOSTIC PREDICTOR IN PATIENTS WITH UROTHELIAL CANCER. J Urol 2002. [DOI: 10.1016/s0022-5347(05)65282-2] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- HIDEAKI MIYAKE
- From the Department of Urology, Kobe University School of Medicine, Kobe, Japan
| | - HIROSHI ETO
- From the Department of Urology, Kobe University School of Medicine, Kobe, Japan
| | - SOICHI ARAKAWA
- From the Department of Urology, Kobe University School of Medicine, Kobe, Japan
| | - SADAO KAMIDONO
- From the Department of Urology, Kobe University School of Medicine, Kobe, Japan
| | - ISAO HARA
- From the Department of Urology, Kobe University School of Medicine, Kobe, Japan
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OVER EXPRESSION OF CD44V8-10 IN URINARY EXFOLIATED CELLS AS AN INDEPENDENT PROGNOSTIC PREDICTOR IN PATIENTS WITH UROTHELIAL CANCER. J Urol 2002. [DOI: 10.1097/00005392-200203000-00017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Abstract
Recent research has revealed the existence of specific mutations in cancer. These mutations are being investigated as targets to find subjects at high risk for cancer, to detect early cancer, to detect the early recurrence of established cancer, and to find micrometastasis. These mutations are reviewed for the major anatomic sites. Some of the clinical issues related to the application of these mutations and the limitations of using molecular targets are also considered. Current methods for determining the risk of cancer are reviewed. Risk assessment is essential for defining cohorts for chemoprevention and other interventions. The concept of using surrogate anatomic and functional sites for estimating risk is introduced. Finally, the increasing complexity of molecular genetic analysis and the biologic heterogeneity of cancer are discussed in relation to early detection.
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Affiliation(s)
- D E Henson
- Cancer Biomarkers Research Group, Division of Cancer Prevention, National Cancer Institute, Bethesda, Maryland 20892, USA
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Hara I, Miyake H, Yamanaka K, Hara S, Arakawa S, Kamidono S. Expression of CD44 adhesion molecules in nonpapillary renal cell carcinoma and normal kidneys. Urology 1999; 54:562-6. [PMID: 10475374 DOI: 10.1016/s0090-4295(99)00177-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVES To analyze the relationship between the alterations in the expression of the CD44 gene in nonpapillary renal cell carcinoma (RCC) and several clinicopathologic factors. METHODS The expression of the CD44 gene in 10 human RCC cell lines, 60 nonpapillary RCC tumor samples, and 15 normal kidney samples was investigated by reverse-transcription polymerase chain reaction (RT-PCR) using a set of primers capable of amplifying all CD44 variant isoforms. The results were analyzed with respect to several clinicopathologic factors. RESULTS Nine of the 10 human RCC cell lines predominantly expressed the standard CD44 isoform (CD44s); CD44v10 was the major isoform in the 10th RCC cell line. The 15 normal kidney samples revealed the identical CD44 gene expression pattern; that is, CD44s, CD44v8-10, and CD44v10 were detectable in normal kidneys, and among them, CD44s was expressed most dominantly. In the 60 nonpapillary RCC samples, CD44s, CD44v8-10, and CD44v10 were the major isoforms in 46 (77%), 11 (18%), and 3 (5%) cases, respectively. Furthermore, the incidence of the predominant expression of CD44v8-10 in high-stage RCC was significantly higher than that in low-stage RCC. CD44s was more frequently expressed as a major isoform in clear cell RCC than in other histologic types of RCC. CONCLUSIONS The results of this study show that the alternative splicing pattern of CD44 gene in RCC is different in each histologic type of RCC and suggest that CD44v8-10 upregulation in the progression of nonpapillary RCC is important.
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Affiliation(s)
- I Hara
- Department of Urology, Kobe University School of Medicine, Japan
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