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Genet SAAM, van den Wildenberg SAH, Broeren MAC, van Dongen JLJ, Brunsveld L, Scharnhorst V, van de Kerkhof D. Quantification of the lung cancer tumor marker CYFRA 21-1 using protein precipitation, immunoaffinity bottom-up LC-MS/MS. Clin Chem Lab Med 2024; 62:720-728. [PMID: 37886827 DOI: 10.1515/cclm-2023-0795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Accepted: 10/15/2023] [Indexed: 10/28/2023]
Abstract
OBJECTIVES Numerous studies have proven the potential of cytokeratin 19 fragment 21-1 (CYFRA 21-1) detection in the (early) diagnosis and treatment monitoring of non-small cell lung cancer (NSCLC). Conventional immunoassays for CYFRA 21-1 quantification are however prone to interferences and lack diagnostic sensitivity and standardization. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) is an emerging approach based on a different, often superior, detection principle, which may improve the clinical applicability of CYFRA 21-1 in cancer diagnostics. Therefore, we developed and validated a protein precipitation, immunoaffinity (IA) LC-MS/MS assay for quantitative analysis of serum CYFRA 21-1. METHODS Selective sample preparation was performed using ammonium sulfate (AS) precipitation, IA purification, tryptic digestion and LC-MS/MS quantification using a signature peptide and isotopically labeled internal standard. The workflow was optimized and validated according to EMA guidelines and results were compared to a conventional immunoassay. RESULTS Significant interference effects were seen during IA purification, which were sufficiently solved by performing AS precipitation prior to IA purification. A linear calibration curve was obtained in the range of 1.0-100 ng/mL (R2=0.98). Accuracy and precision were well within acceptance criteria. In sera of patients suspected of lung cancer, the method showed good correlation with the immunoassay. CONCLUSIONS A robust AS precipitation-IA LC-MS/MS assay for the quantification of serum CYFRA 21-1 was developed. With this assay, the clinically added value of LC-MS/MS-based detection over immunoassays can be further explored.
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Affiliation(s)
- Sylvia A A M Genet
- Laboratory of Chemical Biology, Department of Biomedical Engineering and Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, The Netherlands
- Expert Center Clinical Chemistry, Eindhoven, The Netherlands
- Catharina Hospital, Eindhoven, The Netherlands
| | - Sebastian A H van den Wildenberg
- Laboratory of Chemical Biology, Department of Biomedical Engineering and Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, The Netherlands
- Expert Center Clinical Chemistry, Eindhoven, The Netherlands
- Catharina Hospital, Eindhoven, The Netherlands
| | - Maarten A C Broeren
- Máxima Medical Center, Eindhoven/Veldhoven, The Netherlands
- Laboratory of Chemical Biology, Department of Biomedical Engineering and Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, The Netherlands
- Expert Center Clinical Chemistry, Eindhoven, The Netherlands
| | - Joost L J van Dongen
- Laboratory of Chemical Biology, Department of Biomedical Engineering and Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, The Netherlands
- Expert Center Clinical Chemistry, Eindhoven, The Netherlands
| | - Luc Brunsveld
- Laboratory of Chemical Biology, Department of Biomedical Engineering and Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, The Netherlands
- Expert Center Clinical Chemistry, Eindhoven, The Netherlands
| | - Volkher Scharnhorst
- Laboratory of Chemical Biology, Department of Biomedical Engineering and Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, The Netherlands
- Expert Center Clinical Chemistry, Eindhoven, The Netherlands
- Catharina Hospital, Eindhoven, The Netherlands
| | - Daan van de Kerkhof
- Máxima Medical Center, Eindhoven/Veldhoven, The Netherlands
- Laboratory of Chemical Biology, Department of Biomedical Engineering and Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, The Netherlands
- Expert Center Clinical Chemistry, Eindhoven, The Netherlands
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Time-Course Changes of Serum Keratin Concentrations after Liver Transplantation: Contrasting Results of Keratin-18 and Keratin-19 Fragments. Case Reports Hepatol 2020; 2020:8895435. [PMID: 33335785 PMCID: PMC7723486 DOI: 10.1155/2020/8895435] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 11/08/2020] [Accepted: 11/16/2020] [Indexed: 11/18/2022] Open
Abstract
Objective Under normal conditions, adult hepatocytes express only keratin-8 (K8) and keratin-18 (K18), whereas cholangiocytes also express K19. In this study, we delineate the pattern of normal time-course changes in serum K19 and K18 levels after liver transplantation. Patients and Methods. Serum levels of the K19 fragment CYFRA 21-1 and the K18 fragments tissue polypeptide specific antigen (TPS) and M30 (a neoepitope that is generated after caspase cleavage during apoptosis) were measured at baseline and at regular intervals (up to 6 months) after liver transplantation in 11 adult patients. Results There was a gradual decrease in serum K19 concentrations from baseline values after transplantation, following a time-course pattern similar to that of serum bilirubin. In contrast, serum concentrations of K18 fragments increased markedly shortly after transplantation and gradually decreased thereafter, following a time-course pattern similar to that of serum transaminases. The increase in TPS tended to occur earlier than that in M30, suggesting an initial predominance of hepatocyte necrosis followed by a predominance of apoptosis in the first days after transplantation. Five patients presented posttransplant complications (acute rejection in three cases and HCV recurrence in two cases). An early increase in serum K19 concentrations was observed in all cases. An increase in serum concentrations of K18 fragments (M30 and TPS) was observed in the two cases with HCV recurrence and was more variable in the three cases with acute rejection. Conclusions Serum concentrations of K19 and K18 fragments follow a dissimilar pattern of time-course changes after liver transplantation. The diagnostic value of variations in these normal patterns should be addressed in future studies.
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Duarte CA, Chávez S, Masforrol Y, Puertas S, Paneque T, Ramirez AC, Casillas D, Puente P, Garay H, Fernández-Ortega C. A competitive ELISA for the quantitative determination of the novel anti-HIV drug candidate CIGB-210 in biological fluids. J Immunoassay Immunochem 2018; 40:193-213. [PMID: 30497338 DOI: 10.1080/15321819.2018.1547975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The synthetic peptide CIGB-210 is a promising anti-HIV drug candidate shown to inhibit HIV replication in MT4 cells at the nanomolar range by triggering the rearrangement of vimentin intermediate filaments. Sensitive and specific analytical methods are required for pharmacological studies of CIBG-210 in animals. In this study, we describe the development of a competitive ELISA for the quantitative determination of CIGB-210 using an anti-CIGB-210 hyperimmune serum. After optimization of all the steps, the assay exhibited a dynamic range from 11.87 to 0.0095 µg/mL. The intra-assay coefficient of variation (CV) was lower than or close to 5% for all the six concentrations of the calibrator, and the inter-assay CV was below 10% in five out of the six concentrations tested. No interference of either murine or human plasma was observed. The analyte was stable in plasma after five freeze-thaw cycles, while the hyperimmune serum maintained its binding capacity after 10 freeze-thaw cycles. Furthermore, the ELISA was able to detect the two main metabolites of CIGB-210, although with a tenfold decrease in sensitivity. Our results demonstrate the utility and feasibility of this analytical method for pharmacological experiments in animals as humans.
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Affiliation(s)
- Carlos A Duarte
- a Pharmaceutical Departments , Centro de Ingeniería Genética y Biotecnología , La Habana , Cuba
| | - Sheila Chávez
- a Pharmaceutical Departments , Centro de Ingeniería Genética y Biotecnología , La Habana , Cuba
| | - Yordanka Masforrol
- b Physical-Chemistry Departments , Centro de Ingeniería Genética y Biotecnología , La Habana , Cuba
| | - Samy Puertas
- c Animal Research Departments , Centro de Ingeniería Genética y Biotecnología , La Habana , Cuba
| | - Taimí Paneque
- a Pharmaceutical Departments , Centro de Ingeniería Genética y Biotecnología , La Habana , Cuba
| | - Anna C Ramirez
- a Pharmaceutical Departments , Centro de Ingeniería Genética y Biotecnología , La Habana , Cuba
| | - Dionne Casillas
- a Pharmaceutical Departments , Centro de Ingeniería Genética y Biotecnología , La Habana , Cuba
| | - Pedro Puente
- c Animal Research Departments , Centro de Ingeniería Genética y Biotecnología , La Habana , Cuba
| | - Hilda Garay
- b Physical-Chemistry Departments , Centro de Ingeniería Genética y Biotecnología , La Habana , Cuba
| | - Celia Fernández-Ortega
- a Pharmaceutical Departments , Centro de Ingeniería Genética y Biotecnología , La Habana , Cuba
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Amer HW, Waguih HM, El-Rouby DH. Development of field cancerization in the clinically normal oral mucosa of shisha smokers. Int J Dent Hyg 2018; 17:39-45. [PMID: 30113759 DOI: 10.1111/idh.12362] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Revised: 06/11/2018] [Accepted: 08/06/2018] [Indexed: 11/30/2022]
Affiliation(s)
- Hatem W. Amer
- Oral and Maxillofacial Pathology Department, Faculty of Dentistry; Cairo University; Cairo Egypt
| | - Hend M. Waguih
- Oral and Maxillofacial Pathology Department, Faculty of Dentistry; Cairo University; Cairo Egypt
| | - Dalia H. El-Rouby
- Oral and Maxillofacial Pathology Department, Faculty of Dentistry; Cairo University; Cairo Egypt
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Increased Cytokeratin 19 Fragment Levels Are Positively Correlated with Adenosine Deaminase Activity in Malignant Pleural Effusions from Adenocarcinomas. DISEASE MARKERS 2018; 2018:2609767. [PMID: 29854023 PMCID: PMC5964487 DOI: 10.1155/2018/2609767] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Accepted: 03/29/2018] [Indexed: 12/12/2022]
Abstract
Adenosine deaminase (ADA) and cytokeratin 19 (CK19) are known pleural biomarkers. Although ADA in humans functions mainly in the immune system, it also appears to be associated with the differentiation of epithelial cells. Keratin filaments are important structural stabilizers of epithelial cells and potent biomarkers in epithelial differentiation. This study aimed to investigate the simultaneous presence of the ADA enzyme and CK19 fragments to assess epithelial differentiation in malignant and benign pleural fluids. Diagnosis of the cause of pleural effusion syndrome was confirmed by means of standard examinations and appropriate surgical procedures. An ADA assay, in which ADA irreversibly catalyzes the conversion of adenosine into inosine, was performed using a commercial kit. The CK19 assay was performed using a CYFRA 21-1 kit, developed to detect quantitative soluble fragments of CK19 using an electrochemiluminescence immunoassay. One hundred nineteen pleural fluid samples were collected from untreated individuals with pleural effusion syndrome due to several causes. ADA levels only correlated with CK19 fragments in adenocarcinomas, with high significance and good correlation (rho = 0.5145, P = 0.0036). However, further studies are required to understand this strong association on epithelial differentiation in metastatic pleural fluids from adenocarcinomas.
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Yu Z, Zhang G, Yang M, Zhang S, Zhao B, Shen G, Chai Y. Systematic review of CYFRA 21-1 as a prognostic indicator and its predictive correlation with clinicopathological features in Non-small Cell Lung Cancer: A meta-analysis. Oncotarget 2018; 8:4043-4050. [PMID: 28008142 PMCID: PMC5354811 DOI: 10.18632/oncotarget.14022] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Accepted: 12/02/2016] [Indexed: 12/14/2022] Open
Abstract
AIM To evaluate the value of Cytokeratin 19 fragment for its survival prognostic indicator and predictive correlation with clinicopathological features in Non-small Cell Lung Cancer. METHODS Eligible studies or databases for articles were retrieved via search systematically. Pooled effect was calculated to evaluate the association between Cytokeratin 19 fragment level and long-term overall survival, as well as the tumor clinicopathological features in Non-small Cell Lung Cancer patients. A fixed-effects or random-effects model was used to calculate the Pooled risk ratios (RRs) and corresponding 95 % confidence intervals (CIs). RESULTS Six studies were up to the selection criteria. This meta-analysis indicated that Cytokeratin 19 fragment high level expression correlated with lower 2-year overall survival (RR =0.47; 95%CI: 0.28-0.79), higher Tumor Node Metastasis stage (II+III+IV) (RR =1.43; 95%CI: 1.15-1.76) in Non-small Cell Lung Cancer. The pooled RR estimates indicated that there is no statistical significance of Cytokeratin 19 fragment level expression in the advanced Non-small Cell Lung Cancer (IIIB+IV) (RR =1.43, 95% CI: 0.85-2.43). CONCLUSION Cytokeratin 19 fragment is a negative prognosis indicator and its high level expression indicates higher Tumor Node Metastasis pathological stage (II+III+IV) in Non-small Cell Lung Cancer. In advanced Non-small Cell Lung Cancer, the level of serum Cytokeratin 19 fragment appears to provide more prognostic information than it does for clinical Tumor Node Metastasis stage information. Further studies are required to confirm our results.
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Affiliation(s)
- Zipu Yu
- Department of Thoracic Surgery, 2nd Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Guofei Zhang
- Department of Thoracic Surgery, 2nd Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Maoying Yang
- Department of Thoracic Surgery, 2nd Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Sai Zhang
- Department of Thoracic Surgery, 2nd Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Baiqin Zhao
- Department of Thoracic Surgery, 2nd Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Gang Shen
- Department of Thoracic Surgery, 2nd Affiliated Hospital, Zhejiang University, Hangzhou, China
| | - Ying Chai
- Department of Thoracic Surgery, 2nd Affiliated Hospital, Zhejiang University, Hangzhou, China
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Tang KD, Kenny L, Perry C, Frazer I, Punyadeera C. The overexpression of salivary cytokeratins as potential diagnostic biomarkers in head and neck squamous cell carcinomas. Oncotarget 2017; 8:72272-72280. [PMID: 29069786 PMCID: PMC5641129 DOI: 10.18632/oncotarget.19731] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Accepted: 06/28/2017] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND Cytokeratin (CK) intermediate filaments are demonstrated to have enormous potential in regulating cellular motility and cancer progression. There are more than 20 divergent CKs that have been identified, of which CK 8, 17, 18 and 19 are reported to be elevated in the tumour biopsies of head and neck cancer squamous cell carcinoma (HNSCC) patients. However, CK expression profiles in the saliva of HNSCC patients have not been investigated. We aim to investigate the mRNA expression profiles of CKs in saliva collected from healthy controls, HPV-negative and -positive HNSCC patients. METHODS Oral rinse samples were collected from 42 cancer-free healthy controls (age-matched) and patients who have been diagnosed with HPV-negative (n = 20) and -positive (n = 48) HNSCC. RESULTS Here, we report that the mRNA expression profiles of CKs differed in saliva collected from healthy controls and HNSCC patients. The mRNA expression levels of CK 8 and 18 were significantly elevated in saliva collected from HPV-negative HNSCC patients; whilst, CK 17 and 19 were expressed at a higher mRNA level in saliva collected from HPV-positive HNSCC patients compared to healthy controls. Importantly, receiver operating characteristic (ROC) analysis showed salivary CK 8 and 18 to have superior sensitivity and specificity in discriminating the HPV-negative HNSCC patients from healthy controls (80% and 86%) as well as between HPV-negative and -positive HNSCC patients (75% and 81%). CONCLUSION In summary, we have demonstrated that an aberrant expression of salivary CKs may serve as a potential non-invasive diagnostic biomarker in HNSCC.
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Affiliation(s)
- Kai Dun Tang
- The School of Biomedical Sciences, Institute of Health and Biomedical Innovation, Queensland University of Technology, Kelvin Grove, Queensland, Australia.,The Translational Research Institute, Woolloongabba, Australia
| | - Liz Kenny
- School of Medicine, University of Queensland, Royal Brisbane and Women's Hospital, Brisbane, Queensland, Australia.,Central Integrated Regional Cancer Service, Queensland Health, Brisbane, Queensland, Australia
| | - Chris Perry
- Department of Otolaryngology, Princess Alexandra Hospital, Woolloongabba, Queensland, Australia
| | - Ian Frazer
- The University of Queensland Diamantina Institute, Translational Research Institute, Woolloongabba, Queensland, Australia
| | - Chamindie Punyadeera
- The School of Biomedical Sciences, Institute of Health and Biomedical Innovation, Queensland University of Technology, Kelvin Grove, Queensland, Australia.,The Translational Research Institute, Woolloongabba, Australia
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History, molecular features, and clinical importance of conventional serum biomarkers in lung cancer. Surg Today 2017; 47:1037-1059. [DOI: 10.1007/s00595-017-1477-y] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Accepted: 01/04/2017] [Indexed: 01/27/2023]
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9
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Malhotra R, Urs AB, Chakravarti A, Kumar S, Gupta VK, Mahajan B. Correlation of Cyfra 21-1 levels in saliva and serum with CK19 mRNA expression in oral squamous cell carcinoma. Tumour Biol 2016; 37:9263-71. [DOI: 10.1007/s13277-016-4809-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Accepted: 01/06/2016] [Indexed: 10/22/2022] Open
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Serum markers of CYFRA 21-1 and C-reactive proteins in oral squamous cell carcinoma. World J Surg Oncol 2015; 13:253. [PMID: 26292957 PMCID: PMC4546149 DOI: 10.1186/s12957-015-0656-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Accepted: 07/20/2015] [Indexed: 12/16/2022] Open
Abstract
Background CYFRA 21-1 (cytokeratin 19 fragment) and C-reactive proteins (CRP) were separately reported to be associated with prognosis of head and neck squamous cell carcinoma. The combined roles of CYFRA 21-1 and CRP levels were rarely investigated in oral squamous cell carcinoma (OSCC). The purpose of the present study was to analyze the relationship between preoperative levels of both CYFRA 21-1 and CRP, with clinicopathological factors and prognosis in OSCC patients. Methods A retrospective study was performed on 130 OSCC patients between December 2010 and June 2013. Their serum CYFRA 21-1 and CRP levels were measured preoperatively. Results CYFRA 21-1 level of ≥3.3 ng/mL and CRP level of ≥5.0 mg/L were significantly associated with pathological tumor status (P < 0.001), tumor depth (>10 vs. ≤10 mm, P = 0.001), bone invasion (P = 0.001), skin invasion (P = 0.006), pathologic nodal metastasis (P = 0.012), and disease-free survival (P = 0.009). Higher CYPFRA 21-1 and CRP levels were also associated with higher risks of distant metastasis (log-rank test, P = 0.013, (HR [95 % CI]) 1.692 [1.097–2.414]). Conclusions Preoperative CYFRA 21-1 and CRP levels are probable candidates as biomarkers for risk stratification in OSCC.
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Wu HH, Wang PH, Yeh JY, Chen YJ, Yen MS, Huang RL, Tsai YJ, Yuan CC. Serum cytokeratin-19 fragment (Cyfra 21-1) is a prognostic indicator for epithelial ovarian cancer. Taiwan J Obstet Gynecol 2015; 53:30-4. [PMID: 24767643 DOI: 10.1016/j.tjog.2013.02.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/05/2013] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVES Cytokeratin 19 is significant for indicating cancer cells, and Cyfra 21-1 is a fragment of cytokeratin 19. This retrospective study was designed to define the prognostic value of serum Cyfra 21-1 in epithelial ovarian cancers (EOC). MATERIALS AND METHODS Serum Cyfra 21-1 concentration was obtained from 42 patients with EOC prior to treatment. Various prognostic aspects were examined using univariable and multivariable analyses. The standard serum marker cancer antigen 125 was measured simultaneously and compared in this analysis. RESULTS Serum levels of both Cyfra 21-1 and cancer antigen 125 were associated with positive retroperitoneal lymph nodes and platinum resistance; higher levels of Cyfra 21-1 (3.0 ng/mL as the cut-off) were associated with shorter disease-free survival (16 months vs. 28 months, p = 0.001) and overall survival (29 months vs. 41 months, p = 0.007) than lower levels. Further univariable analysis showed that Cyfra 21-1, poor differentiation, and retroperitoneal lymph node metastasis were related to platinum resistance and mortality. Multivariable analysis indicated retroperitoneal lymph node metastasis and serum Cyfra 21-1 were independent risk factors for both disease-free survival and overall survival. CONCLUSION The pretreatment level of serum Cyfra 21-1 had remarkable prognostic significance for EOC, indicating poor survival when it was elevated above 3.0 ng/mL.
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Affiliation(s)
- Hua-Hsi Wu
- Department of Obstetrics and Gynecology, Taipei Veterans General Hospital and National Yang-Ming University, Taipei, Taiwan; Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan
| | - Peng-Hui Wang
- Department of Obstetrics and Gynecology, Taipei Veterans General Hospital and National Yang-Ming University, Taipei, Taiwan; Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan; Immunology Center, Taipei Veterans General Hospital, Taipei, Taiwan; Department of Medical Research, China Medical University Hospital, Taichung, Taiwan
| | - Jiun-Yih Yeh
- Department of Obstetrics and Gynecology, Taipei Veterans General Hospital and National Yang-Ming University, Taipei, Taiwan
| | - Yi-Jen Chen
- Department of Obstetrics and Gynecology, Taipei Veterans General Hospital and National Yang-Ming University, Taipei, Taiwan; Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan
| | - Ming-Shyen Yen
- Department of Obstetrics and Gynecology, Taipei Veterans General Hospital and National Yang-Ming University, Taipei, Taiwan
| | - Rui-Lan Huang
- Department of Obstetrics and Gynecology, Taipei Medical University-Shuang Ho Hospital, New Taipei City, Taiwan
| | - Yueh-Ju Tsai
- Department of Obstetrics and Gynecology, Taipei Medical University-Shuang Ho Hospital, New Taipei City, Taiwan
| | - Chiou-Chung Yuan
- Department of Obstetrics and Gynecology, Taipei Medical University-Shuang Ho Hospital, New Taipei City, Taiwan.
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Xie S, Ding X, Mo W, Chen J. Serum tissue polypeptide-specific antigen is an independent predictor in breast cancer. Acta Histochem 2014; 116:372-6. [PMID: 24144486 DOI: 10.1016/j.acthis.2013.09.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Revised: 08/31/2013] [Accepted: 09/01/2013] [Indexed: 11/17/2022]
Abstract
Tissue polypeptide-specific antigen (TPS) is a tumor proliferative marker associated with cytokeratin 18. The aim of the study was to investigate the potential relationship between the preoperative serum TPS levels and the outcome in Chinese breast cancer patients. 975 consecutive female patients, affected by invasive breast cancer under investigation from January 2005 to December 2011, had their TPS levels measured with a one-step solid phase radiometric sandwich assay detecting the M3 epitope on cytokeratin 18 fragments. The cut-off value was 80U/L. The average age diagnosed with breast cancer was 48, ranging from 23 to 71. About 19% (185) patients displayed an elevated preoperative TPS level (>80U/L) associated with older age (>45), advanced cancer stage, larger tumor size (>2cm), axillary lymph node metastasis, negative progesterone receptor status, and positive HER2 status. In addition, preoperative TPS levels were also significantly connected with recurrence (p<0.05), particularly distant metastasis and visceral metastasis. The mean preoperative TPS level was 68.4±116.43U/L (range 0-1839U/L). In multivariate analysis, high preoperative TPS level was recognized as an independent prognostic factor for disease-free survival (p<0.001 and overall survival (p=0.023). From these results we conclude that the serum preoperative TPS level may be a valuable and independent marker for breast cancer.
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Affiliation(s)
- Shangnao Xie
- Department of Breast Surgery, Zhejiang Cancer Hospital, Zhejiang, China.
| | - Xiaowen Ding
- Department of Breast Surgery, Zhejiang Cancer Hospital, Zhejiang, China
| | - Wenju Mo
- Department of Breast Surgery, Zhejiang Cancer Hospital, Zhejiang, China
| | - Jie Chen
- Department of Breast Surgery, Zhejiang Cancer Hospital, Zhejiang, China
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Serum markers in small cell lung cancer: opportunities for improvement. Biochim Biophys Acta Rev Cancer 2013; 1836:255-72. [PMID: 23796706 DOI: 10.1016/j.bbcan.2013.06.002] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 06/11/2013] [Accepted: 06/13/2013] [Indexed: 12/11/2022]
Abstract
Lung cancer is one of the leading causes of death from malignancy worldwide. In particular small cell lung cancers, which comprise about 15-20% of all lung cancers, are extremely aggressive and cure rates are extremely low. Therefore, new treatment modalities are needed and detection at an early stage of disease, as well as adequate monitoring of treatment response is essential in order to improve outcome. In this respect, the use of non-invasive tools for screening and monitoring has gained increasing interest and the clinical applicability of reliable, tumor-related substances that can be detected as tumor markers in easily accessible body fluids is subject of intense investigation. Some of these indicators, such as high LDH levels in serum as a reflection of the disease, have been in use for a long time as a general tumor marker. To allow for improved monitoring of the efficacy of new therapeutic modalities and for accurate subtyping, there is a strong need for specific and sensitive markers that are more directly related to the biology and behavior of small cell lung cancer. In this review the current status of these potential markers, like CEA, NSE, ProGRP, CK-BB, SCC, CgA, NCAM and several cytokeratins will be critically analyzed with respect to their performance in blood based assays. Based on known cleavage sites for cytoplasmic and extracellular proteases, a prediction of stable fragments can be obtained and used for optimal test design. Furthermore, insight into the synthesis of specific splice variants and neo-epitopes resulting from protein modification and cleavage, offers further opportunities for improvement of tumor assays. Finally, we discuss the possibility that detection of SCLC related autoantibodies in paraneoplastic disease can be used as a very early indicator of SCLC.
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Ahn SK, Moon HG, Ko E, Kim HS, Shin HC, Kim J, You JM, Han W, Noh DY. Preoperative serum tissue polypeptide-specific antigen is a valuable prognostic marker in breast cancer. Int J Cancer 2012; 132:875-81. [DOI: 10.1002/ijc.27727] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2012] [Accepted: 07/02/2012] [Indexed: 11/10/2022]
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15
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Prognostic value of tissue polypeptide antigen in oral squamous cell carcinoma. Oral Oncol 2011; 47:114-20. [DOI: 10.1016/j.oraloncology.2010.11.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2010] [Revised: 11/08/2010] [Accepted: 11/08/2010] [Indexed: 11/22/2022]
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16
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Dive C, Smith RA, Garner E, Ward T, George-Smith SS, Campbell F, Greenhalf W, Ghaneh P, Neoptolemos JP. Considerations for the use of plasma cytokeratin 18 as a biomarker in pancreatic cancer. Br J Cancer 2010; 102:577-82. [PMID: 20051949 PMCID: PMC2822934 DOI: 10.1038/sj.bjc.6605494] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2009] [Revised: 11/16/2009] [Accepted: 11/20/2009] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND Enzyme-linked immunoassays of full-length (M65) and/or caspase-cleaved (M30) cytokeratin 18 (CK18) released from epithelial cells undergoing necrosis and/or apoptosis, respectively, may have prognostic or predictive biomarker utility in a range of solid tumour types. Characterisation of baseline levels of circulating full length and cleaved CK18 specifically in patients with pancreatic cancer. METHODS Plasma samples from 103 patients with pancreatic cancer stored at -80 degrees C were assayed for M65 and M30 levels. The median (inter-quartile range (IQR)) duration of plasma storage was 34 (23-57) months. Patients with metastatic disease (n=19) were found to have greater median (IQR) M65 levels (1145 (739-1698) U l(-1)) compared with the locally advanced (n=20; 748 (406-1150) U l(-1)) and resected (n=64; 612 (331-987) U l(-1)) patients (P=0.002). Elevated M65 levels were associated with poorer overall survival on univariate (P<0.001) but not multivariate (P=0.202) analysis. M65 concentrations also exhibited significant associations with concurrent serum-bilirubin levels (P<0.001) and the duration of plasma storage (P<0.001). CONCLUSIONS Baseline plasma CK18 levels in pancreatic cancer are affected by the presence of obstructive jaundice and prolonged plasma storage. Clinical biomarker studies utilising serial CK18 levels are warranted in pancreatic cancer, provided consideration is given to these potentially confounding factors.
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Affiliation(s)
- C Dive
- Clinical and Experimental Pharmacology Group, Paterson Institute for Cancer Research, University of Manchester, Manchester, UK
| | - R A Smith
- Liverpool Experimental Cancer Medicines Centre and NIHR Pancreas Biomedical Research Unit, Royal Liverpool University Hospital, 5th Floor UCD Building, Daulby St, Liverpool L69 3GA, UK
| | - E Garner
- Liverpool Experimental Cancer Medicines Centre and NIHR Pancreas Biomedical Research Unit, Royal Liverpool University Hospital, 5th Floor UCD Building, Daulby St, Liverpool L69 3GA, UK
| | - T Ward
- Clinical and Experimental Pharmacology Group, Paterson Institute for Cancer Research, University of Manchester, Manchester, UK
| | - S St George-Smith
- Clinical and Experimental Pharmacology Group, Paterson Institute for Cancer Research, University of Manchester, Manchester, UK
| | - F Campbell
- Department of Pathology, Royal Liverpool University Hospital, Prescot St, Liverpool L7 8XP, UK
| | - W Greenhalf
- Liverpool Experimental Cancer Medicines Centre and NIHR Pancreas Biomedical Research Unit, Royal Liverpool University Hospital, 5th Floor UCD Building, Daulby St, Liverpool L69 3GA, UK
| | - P Ghaneh
- Liverpool Experimental Cancer Medicines Centre and NIHR Pancreas Biomedical Research Unit, Royal Liverpool University Hospital, 5th Floor UCD Building, Daulby St, Liverpool L69 3GA, UK
| | - J P Neoptolemos
- Liverpool Experimental Cancer Medicines Centre and NIHR Pancreas Biomedical Research Unit, Royal Liverpool University Hospital, 5th Floor UCD Building, Daulby St, Liverpool L69 3GA, UK
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Circulating Serum Vascular Endothelial Growth Factor is Not a Prognostic Factor of Non-small Cell Lung Cancer. J Thorac Oncol 2008; 3:1119-26. [DOI: 10.1097/jto.0b013e318187464e] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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18
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Cytokeratin fragments in the serum: their utility for the management of oral cancer. Oral Oncol 2008; 44:722-32. [PMID: 18203649 DOI: 10.1016/j.oraloncology.2007.10.008] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2007] [Revised: 10/30/2007] [Accepted: 10/31/2007] [Indexed: 11/23/2022]
Abstract
Head and neck squamous cell carcinoma (HNSCC) is the sixth most common malignancy and is a major cause of cancer morbidity and mortality worldwide. Oral cancer is the most predominant malignancy in the Indian subcontinent due to the widespread habits of chewing tobacco and related products. Patients with oral tumours have a high risk of early locoregional relapse. Early detection of disease progression remains a challenging task mainly due to the lack of adequate early prognostic markers. CEA, SCC Ag, CA-125, serum cytokeratin (CK) fragments, Cyfra 21-1 (CK 19), TPS (CK 18), TPA (CK 8, 18, and 19) etc. are being used as serum markers for the prediction of prognosis of various malignancies. This review presents the available literature on serum CK markers in different malignancies evaluates their utility in the management of oral cancer, and identifies the lacunae which need to be addressed to develop sensitive and specific assays for early detection of recurrence, prognosis, and treatment monitoring.
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19
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Campos-Fernandes JL, Descotes F, André J, Perrin P, Devonec M, Ruffion A. Intérêt des marqueurs urinaires dans le diagnostic et le suivi des tumeurs urothéliales de vessie. Prog Urol 2007; 17:23-34. [PMID: 17373233 DOI: 10.1016/s1166-7087(07)92221-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Urothelial bladder tumours require regular surveillance: cystoscopy associated with urine cytology are reference examinations. Several new markers currently under evaluation or already validated have recently been proposed to replace cytology and potentially reduce or even replace unnecessary cystoscopies. The biological fluid studied for all of these markers is the same as that of urine cytology, i.e. urine. The authors review the results of recent studies on these new urinary markers. The results of these markers demonstrate a better global sensitivity than urine cytology, but often a lower specificity. In the majority of cases, these tests are performed during patient follow-up (NMP22, BTA, CYFRA 21-l., etc.), but do not replace cystoscopy, due to a large number of false-positives. Other techniques, such as FISH, uCyt+ or microsatellites appear to be more promising, especially for the diagnosis of low-grade tumours. The best solution in practice may consist of a combination of several markers to further improve sensitivity and to decrease the false-positive rate responsible for unnecessary cystoscopies.
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20
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Linder S. Cytokeratin Markers Come of Age. Tumour Biol 2007; 28:189-95. [PMID: 17717426 DOI: 10.1159/000107582] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2007] [Accepted: 05/23/2007] [Indexed: 01/06/2023] Open
Abstract
Cytokeratins have been extensively used as serum tumour markers for monitoring of disease progression in cancer patients. The source of cytokeratins in the circulation as well as the mechanisms of release from cells have long been unclear. Recent evidence suggests that cytokeratins present in the circulation of cancer patients are released from apoptotic or necrotic tumour cells. CK18 is cleaved by caspases during apoptosis and a monoclonal antibody (M30) specific to caspase-cleaved forms is available. The molecular form of CK18 released from cells (caspase-cleaved or not) can conveniently be determined by immunoassays (M30-Apoptosense and M65 ELISA assays; Peviva AB, Bromma, Sweden) to determine cell death mode--apoptosis or necrosis. Recent studies where these assays were used to evaluate the response to cytotoxic anticancer drugs using cancer patient serum have been encouraging. CK18 is attracting considerable interest as a response biomarker during clinical trials of anticancer drugs. Properties such as excellent antigen stability and the epithelial specificity of cytokeratins contribute to make this biomarker attractive.
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Affiliation(s)
- Stig Linder
- Cancer Center Karolinska, Department of Oncology and Pathology, Karolinska Institute and Hospital, Stockholm, Sweden.
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21
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Ueno T, Toi M, Linder S. Detection of epithelial cell death in the body by cytokeratin 18 measurement. Biomed Pharmacother 2006; 59 Suppl 2:S359-62. [PMID: 16507409 DOI: 10.1016/s0753-3322(05)80078-2] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Cell death is as important as cell division in both physiological and pathological processes. Three major types of cell death have been described: apoptosis, autophagy and necrosis. Apoptosis is a form of programmed cell death, mediated by caspases. Autophagy is an evolutionarily conserved process involving lysosomes, implicated in both cell survival and death. Necrosis is believed to be an unregulated process, followed by release of intracellular components. The epithelial-specific intermediate filament cytokeratin 18 (Kl8) has different fates depending on the type of cell death. During apoptosis, K18 is cleaved at two sites into three fragments, one of which is specifically recognized by the monoclonal antibody, M30. During autophagy K18 is reported to stay uncleaved. Necrotic cells are considered to release K18. Thus, serum levels of different forms of K18 would reflect the type of cell death occurring in the body. Two enzyme-linked immunosorbent assays have been developed: one for the cleaved fragments of K18 and the other for total K18. Detection of serum levels of cleaved and total K18 showed that the ratios between cleaved and total K18 were highly variable among patients with endometrial cancer. Monitoring serum levels of cleaved and total K18 during chemotherapy showed an association between increases in total K18 levels and clinical responses. Monitoring serum levels of K18 may be a promising approach for early detection of therapeutic effects and the levels of different forms of K18 might indicate the mode of cell death occurring in the body.
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Affiliation(s)
- T Ueno
- Cancer Center Karolinska, Department of Oncology-Pathology, Karolinska Institute and Hospital, Stockholm, Sweden.
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22
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Chen Z, Chen J, Weng T, Jin N, Liu L. Identification of rat lung--prominent genes by a parallel DNA microarray hybridization. BMC Genomics 2006; 7:47. [PMID: 16533406 PMCID: PMC1523215 DOI: 10.1186/1471-2164-7-47] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2005] [Accepted: 03/13/2006] [Indexed: 11/10/2022] Open
Abstract
Background The comparison of organ transcriptomes is an important strategy for understanding gene functions. In the present study, we attempted to identify lung-prominent genes by comparing the normal transcriptomes of rat lung, heart, kidney, liver, spleen, and brain. To increase the efficiency and reproducibility, we first developed a novel parallel hybridization system, in which 6 samples could be hybridized onto a single slide at the same time. Results We identified the genes prominently expressed in the lung (147) or co-expressed in lung-heart (23), lung-liver (37), lung-spleen (203), and lung-kidney (98). The known functions of the lung-prominent genes mainly fell into 5 categories: ligand binding, signal transducer, cell communication, development, and metabolism. Real-time PCR confirmed 13 lung-prominent genes, including 5 genes that have not been investigated in the lung, vitamin D-dependent calcium binding protein (Calb3), mitogen activated protein kinase 13 (Mapk13), solute carrier family 29 transporters, member 1 (Slc29a1), corticotropin releasing hormone receptor (Crhr1), and lipocalin 2 (Lcn2). Conclusion The lung-prominent genes identified in this study may provide an important clue for further investigation of pulmonary functions.
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Affiliation(s)
- Zhongming Chen
- Department of Physiological Sciences, Oklahoma State University, Stillwater, Oklahoma 74078, USA
| | - Jiwang Chen
- Department of Physiological Sciences, Oklahoma State University, Stillwater, Oklahoma 74078, USA
| | - Tingting Weng
- Department of Physiological Sciences, Oklahoma State University, Stillwater, Oklahoma 74078, USA
| | - Nili Jin
- Department of Physiological Sciences, Oklahoma State University, Stillwater, Oklahoma 74078, USA
| | - Lin Liu
- Department of Physiological Sciences, Oklahoma State University, Stillwater, Oklahoma 74078, USA
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23
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Gonzalez-Quintela A, García J, Campos J, Perez LF, Alende MR, Otero E, Abdulkader I, Tomé S. Serum cytokeratins in alcoholic liver disease: contrasting levels of cytokeratin-18 and cytokeratin-19. Alcohol 2006; 38:45-9. [PMID: 16762691 DOI: 10.1016/j.alcohol.2006.01.003] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2005] [Revised: 01/20/2006] [Accepted: 01/20/2006] [Indexed: 01/21/2023]
Abstract
Serum cytokeratin (CK) levels are widely used as tumor markers. Serum levels of CK-18, a tumor marker also known as tissue polypeptide specific antigen (TPS), are increased in patients with alcoholic liver disease. Cytokeratin-18 is the main component of Mallory bodies, a hallmark of alcoholic hepatitis, which may also contain CK-19. Serum levels of CK-18 and CK-19, a tumor marker also known as CYtokeratin FRAgment 21-1 (CYFRA 21-1) were investigated in (a) heavy drinkers with alcoholic liver disease (n=15), (b) patients with malignancy (n=22), and (c) healthy controls (n=10). Serum levels of CYFRA 21-1 (CK-19) were markedly increased in patients with malignancy, but were similar in heavy drinkers and healthy controls. In contrast, serum levels of TPS (CK-18) in heavy drinkers were higher than those of healthy controls, and even tended to be higher than those of patients with malignancy. Both CK-19 and CK-18 levels were higher in cases of alcoholic hepatitis than in cases of fatty liver. Correlation with hepatocyte CK inclusions was stronger for serum TPS (CK-18) than for CYFRA 21-1 (CK-19). In conclusion, serum CYFRA 21-1 (CK-19) and TPS (CK-18) show a different pattern of increase that could reflect the composition of the altered hepatocyte CK network in alcoholic liver disease. Their usefulness as tumor markers, particularly that of serum TPS (CK-18), may be limited in patients with alcoholic liver disease.
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Affiliation(s)
- A Gonzalez-Quintela
- Department of Internal Medicine, Complejo Hospitalario Universitario de Santiago, Spain.
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24
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Barak V, Goike H, Panaretakis KW, Einarsson R. Clinical utility of cytokeratins as tumor markers. Clin Biochem 2005; 37:529-40. [PMID: 15234234 DOI: 10.1016/j.clinbiochem.2004.05.009] [Citation(s) in RCA: 226] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/04/2004] [Indexed: 12/22/2022]
Abstract
Cytokeratins, belonging to the intermediate filament (IF) protein family, are particularly useful tools in oncology diagnostics. At present, more than 20 different cytokeratins have been identified, of which cytokeratins 8, 18, and 19 are the most abundant in simple epithelial cells. Upon release from proliferating or apoptotic cells, cytokeratins provide useful markers for epithelial malignancies, distinctly reflecting ongoing cell activity. It appears that motifs in certain cytokeratins make them likely substrates for caspase degradation, and their subsequent release occurs during the intermediate events in apoptosis. The clinical value of determining soluble cytokeratin protein fragments in body fluids lies in the early detection of recurrence and the fast assessment of the efficacy of therapy response in epithelial cell carcinomas. The three most applied cytokeratin markers used in the clinic are tissue polypeptide antigen (TPA), tissue polypeptide specific antigen (TPS), and CYFRA 21-1. TPA is a broad spectrum test that measures cytokeratins 8, 18, and 19. TPS and CYFRA 21-1 assays are more specific and measure cytokeratin 18 and cytokeratin 19, respectively. By following patients with repeated testing during management, the oncologist may obtain critical information regarding the growth activity in symptomatic patients. Although their main use is to monitor treatment and evaluate response to therapy, early prognostic information particularly on tumor progression and metastasis formation is also provided for several types of cancers. Cytokeratin tumor markers can accurately predict disease status before conventional methods and offer a simple, noninvasive, cheap, and reliable tool for more efficient management.
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Affiliation(s)
- Vivian Barak
- Immunology Laboratory for Tumor Diagnosis, Oncology Department, Hadassah University Hospital, Jerusalem, Israel
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25
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Abstract
In cancer, apoptotic processes occur both spontaneously and induced by antitumor therapies. Qualitative and quantitative changes in cancer cell death along with proliferative alterations are essential determinants in the pathogenesis and progression of malignant disease and its responsiveness to therapy. Besides detecting apoptosis by invasive means in tumor tissue, apoptotic products can be quantified in the circulation. Although circulating apoptotic products usually lack organ and tumor specificity, they contribute in the assessment of disease extent or aggressiveness. The ease of drawing blood facilitates the serial measurement of circulating apoptotic markers to monitor antitumor treatment and predict early response to therapy. This review describes the features of apoptotic and necrotic cell death along with the role the balance between the rates of cell death and cell proliferation plays in the progression of malignancy. The intracellular pathways mediating apoptosis are next summarized. The focus then shifts to the apoptotic markers found in the circulation and their diagnostic, prognostic, predictive, and management utility in cancer.
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Affiliation(s)
- S Holdenrieder
- Institute of Clinical Chemistry, University Hospital Munich-Grosshadern, D-81377 Munich, Germany
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26
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Pujol JL, Molinier O, Ebert W, Daurès JP, Barlesi F, Buccheri G, Paesmans M, Quoix E, Moro-Sibilot D, Szturmowicz M, Bréchot JM, Muley T, Grenier J. CYFRA 21-1 is a prognostic determinant in non-small-cell lung cancer: results of a meta-analysis in 2063 patients. Br J Cancer 2004; 90:2097-105. [PMID: 15150567 PMCID: PMC2409493 DOI: 10.1038/sj.bjc.6601851] [Citation(s) in RCA: 130] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The purpose of this study was to determine the prognostic significance of a high pretreatment serum CYFRA 21-1 level (a cytokeratin 19 fragment) adjusted for the effects of well-known co-variables in non-small-cell lung cancer (NSCLC). This meta-analysis based on individual updated data gathered comprehensive databases from published or unpublished controlled studies dealing with the prognostic effect of serum CYFRA 21-1 level at presentation in NSCLC of any stage (nine institutions, 2063 patients). Multivariate regression was carried out with the Cox model. The proportional hazard assumption for each of the selected variables retained in the final model was originally checked by log minus log plots baseline hazard ratio. The follow-up ranged from 25 to 78 months. A total of 1616 events were recorded. In the multivariate analysis performed at the 1-year end point, a high pretreatment CYFRA 21-1 level was an unfavourable prognostic determinant in all centres except one (Hazard ratio (95% confidence interval): 1.88 (1.64–2.15), P<10−4). Other significant variables were stage of the disease, age and performance status. Within the first 18 months, the procedure disclosed a nearly similar hazard ratio for patients having a high pretreatment serum CYFRA 21-1 level (1.62 (1.42–1.86), P<10−4). For patients who did not undergo surgery, the hazard ratio during the first year of follow-up was 1.78 (1.54–2.07), P<10−4. Finally, in the surgically treated population, at the 2-year end point, a high pretreatment CYFRA 21-1 and a locally advanced stage remained unfavourable prognostic determinants. In conclusion CYFRA 21-1 might be regarded as a putative co-variable in analysing NSCLC outcome inasmuch as a high serum level is a significant determinant of poor prognosis whatever the planned treatment.
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Affiliation(s)
- J-L Pujol
- Montpellier Academic Hospital, Hôpital Arnaud de Villeneuve, Avenue du Doyen Giraud, 34295 Montpellier Cedex 5, France.
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27
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Abstract
Simple epithelial keratins K8 and K18 are components of the intracellular cytoskeleton in the cells of the single-layered sheet tissues inside the body. As members of the intermediate filament family of proteins, their function has been a matter for debate since they were first discovered. Whilst there is an indisputable case for a structural cell-reinforcing function for keratins in the mutilayered squamous epithelia of external barrier tissues, some very different stress-protective features now seem to be emerging for the simple epithelial keratins. Even the emerging evidence of pathological mutations in K8/K18 looks very different from mutations in stratified epithelial keratins. K8/K18-like keratins were probably the first to evolve and, whilst stratified epithelial (keratinocyte) keratins have diversified into a large group of keratins highly specialised for providing mechanical stability, the simple epithelial keratins have retained early features that may protect the internal epithelia from a broader range of stresses, including osmotic stress and chemical toxicity.
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Affiliation(s)
- Dewi W Owens
- Cancer Research UK Cell Structure Research Group, School of Life Sciences, University of Dundee, Scotland.
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28
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Sheard MA, Vojtesek B, Simickova M, Valik D. Release of cytokeratin-18 and -19 fragments (TPS and CYFRA 21-1) into the extracellular space during apoptosis. J Cell Biochem 2002; 85:670-7. [PMID: 11968007 DOI: 10.1002/jcb.10173] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Serum fragments of cytokeratins-18 and -19 (measured as TPS and CYFRA 21-1, respectively) have traditionally been considered as markers of tumor proliferation, although the evidence is scarce for a causative relationship between proliferation and levels of TPS and CYFRA 21-1. We examined whether apoptosis might produce TPS and CYFRA 21-1 fragments. MCF-7 breast cancer cells were treated with mitomycin C or agonistic anti-CD95 antibody, and levels of TPS and CYFRA 21-1 in tissue culture supernatants were compared with the frequency of cells exhibiting the following markers of cell death: intracellular cytokeratin-18 cleavage, surface staining with annexin-V, propidium iodide uptake, DNA fragmentation. Twenty-four hours after inducing apoptosis, levels of TPS and CYFRA 21-1 were elevated > or = 4-fold in culture supernatants. Elevations in TPS and CYFRA 21-1 coincided with apoptosis measured by the first three cell death markers but preceded DNA fragmentation. These mitomycin C- and CD95-mediated elevations were completely inhibited by co-incubation with the caspase inhibitors Z-VAD.fmk and Z-IETD.fmk, respectively. We conclude that TPS and CYFRA 21-1 can be abundantly released into the extracellular space during the intermediate stage of epithelial cell apoptosis.
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Affiliation(s)
- Michael A Sheard
- Laboratory of Apoptosis Research, Masaryk Memorial Cancer Institute, Zluty Kopec 7, 656 53 Brno, Czech Republic.
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29
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Ditzel HJ, Strik MCM, Larsen MK, Willis AC, Waseem A, Kejling K, Jensenius JC. Cancer-associated cleavage of cytokeratin 8/18 heterotypic complexes exposes a neoepitope in human adenocarcinomas. J Biol Chem 2002; 277:21712-22. [PMID: 11923318 DOI: 10.1074/jbc.m202140200] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The intermediate filament network in simple glandular epithelial cells predominantly consists of heterotypic complexes of cytokeratin 8 (K8) and cytokeratin 18 (K18). In contrast to other cytokeratins, K8 and K18 are persistently expressed during malignant transformation, but changes in cell morphology are accompanied by alterations in the intermediate filament network. To study molecular changes, K8 and K18 were purified from surgically removed colon cancer and normal epithelia tissues. Western blotting and amino acid sequencing revealed the presence of abundant K8 and K18 fragments, truncated at the N terminus, from cancerous, but not normal, epithelial cells. The fragmentation pattern indicates proteolysis mediated by several enzymes, including trypsin-like enzymes. The cancer-associated forms of K8 and K18 are specifically recognized by the human antibody, COU-1, cloned from the B cells of a cancer patient. We demonstrate that COU-1 recognizes a unique conformational epitope presented only by a complex between K8 and K18. The epitope is revealed after proteolytic removal of the head domain of either K8 or K18. A large panel of recombinant K8 and K18 fragments, deleted N- or C-terminally, allowed for the localization of the COU-1 epitope to the N-terminal part of the rod domains. Using surface plasmon resonance, the affinity of COU-1 for this epitope was determined to be 10(9) x m(-1), i.e. more than 2 orders of magnitude higher than for intact heterotypic K8/K18 complexes. The cellular distribution of truncated K8/K18 heterotypic complexes in viable adenocarcinomas cells was probed using COU-1 showing small fibrillar structures distinct from those of intact K8/K18 complexes. Previously we demonstrated the binding and subsequent internalization of recombinant Fab COU-1 to live cancer cells. We have thus characterized a cancer neoepitope recognized by the humoral immune system. The results have biological as well as clinical implications.
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MESH Headings
- Adenocarcinoma/metabolism
- Amino Acid Sequence
- Antibodies, Monoclonal/metabolism
- Antibodies, Monoclonal, Humanized
- Blotting, Western
- Dose-Response Relationship, Drug
- Electrophoresis, Polyacrylamide Gel
- Enzyme-Linked Immunosorbent Assay
- Epitopes
- Gene Deletion
- Humans
- Immunoglobulin Fab Fragments/metabolism
- Keratins/chemistry
- Keratins/metabolism
- Microscopy, Confocal
- Models, Biological
- Molecular Sequence Data
- Protein Binding
- Protein Structure, Tertiary
- Recombinant Proteins/chemistry
- Recombinant Proteins/metabolism
- Surface Plasmon Resonance
- Temperature
- Tumor Cells, Cultured
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Affiliation(s)
- Henrik J Ditzel
- Department of Immunology, The Scripps Research Institute, La Jolla, California 92037, USA.
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30
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Nisman B, Barak V, Shapiro A, Golijanin D, Peretz T, Pode D. Evaluation of urine CYFRA 21-1 for the detection of primary and recurrent bladder carcinoma. Cancer 2002; 94:2914-22. [PMID: 12115379 DOI: 10.1002/cncr.10565] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND The urinary concentration of soluble cytokeratin 19 fragments, measured by the CYFRA 21-1 assay, may be used for the noninvasive, early detection of bladder carcinoma. METHODS This prospective study examined urine samples from 325 patients. The authors included 152 patients who presented with hematuria or irritative voiding symptoms (Group 1), 107 patients who were under surveillance after undergoing transurethral resection of bladder carcinoma (Group 2), 46 patients with urinary tract pathology other than bladder carcinoma (Group 3), and 20 healthy participants (Group 4). The urine concentration of CYFRA 21-1 was measured by an immunoradiometric assay. The patients in Groups 1 and 2 underwent cytoscopy and urine cytopathology. Biopsies were obtained if a tumor was seen on cytoscopy or if there was a suspicion of carcinoma in situ (CIS). RESULTS The optimal cut-off concentration for the detection of primary bladder tumors, 4.9 microg/L, resulted in a sensitivity of 79.3% and a specificity of 88.6%. The optimal threshold for the detection of recurrent bladder tumors (excluding patients who had been treated with intravesical bacillus Calmette-Guerin [BCG]), 4.04 microg/L, resulted in a sensitivity of 76.2% and a specificity of 84.2%. There was no significant advantage for centrifugation of the urine samples or for determination of the creatinine concentration in the urine samples. The CYFRA 21-1 assay of urine samples provided a three-fold greater sensitivity compared with the sensitivity of cytology for detecting Grade 1 transitional cell tumors. CYFRA 21-1 detected 91.9% of Grade 3 tumors, 100% of CIS, and 92.8% of invasive bladder tumors (T2 or higher classification). The CYFRA 21-1 assay detected all tumors that had positive cytology with the exception of only one tumor. Conversely, the assay identified 71% of primary tumors and 65% of recurrent tumors that were missed by cytopathology. Urinary stones, infection, and previous intravesical BCG immunotherapy caused many false positive results. CONCLUSIONS The urinary CYFRA 21-1 assay is a useful test for the noninvasive detection of bladder carcinoma and for surveillance of patients who were not treated previously with BCG. It may be used in combination with urine cytology and bladder ultrasound. Multi-institutional trials are required to compare the accuracy as well as the cost of this combination of tests with cystoscopy.
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Affiliation(s)
- Benjamin Nisman
- Department of Oncology, Hadassah University Hospital, Jerusalem, Israel.
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31
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Fujita J, Dohmoto K, Hojo S, Ueda Y, Bandoh S, Yang Y, Yamaji Y, Ohtsuki Y, Ishida T. The point mutation in the promoter region and the single nucleotide polymorphism in exon 1 of the cytokeratin 19 gene in human lung cancer cell lines. Lung Cancer 2001; 34:387-94. [PMID: 11714536 DOI: 10.1016/s0169-5002(01)00271-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The CYFRA 21-1 assay which detects the cytokeratin 19 (CK19) fragment is widely used as a tumor marker for lung cancer. We previously suggested that the failure of PCR amplification of exon 1 is closely related to the inability of the expression of mRNA for CK19, and hypothesized that point mutations might exist within exon 1. In order to prove this, sequence analysis of the promoter region and exon 1 was performed in 14 human lung cancer cell lines. Among the 14 lung cancer cell lines evaluated, point mutations within the promoter region (at -99, G-->C) of the CK19 gene were demonstrated in two cell lines (Lu135 and HI1017). In addition, point mutations within exon 1 (at 90, T-->C, Ala-->Ala and at 179, G-->C, Gly-->Ala) were also demonstrated in three cell lines (LU135, HI1017, and LC2/AD). Point mutations within the promoter region of CK19 (at -99) and within exon 1 (at 179) were confirmed by analysis of digestion by specific restriction enzymes. Since the same point mutation within exon 1 (at 179) was observed in genomes of normal volunteers, this mutation was considered as a single nucleotide polymorphism. In contrast, there were no mutations within the promoter region of exon 1 in genomes of normal volunteers. After a computer search, it was demonstrated that several transcription factors bind to the sense primer sequence which was designed for amplification of exon 1. In addition, after point mutations within the promoter region occurred (at -99), new sequences appeared to which known transcription factors (AP2) bind. In conclusion, analysis of genomic DNA for CK19 suggested that expression of mRNA for CK19 was regulated by several transcription factors which bound to the specific sequence with the promoter region of the CK19 gene. It was also suggested that the mutation in the promoter region of the CK19 gene down-regulated the expression of mRNA for CK19.
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Affiliation(s)
- J Fujita
- First Department of Internal Medicine, Kagawa Medical University, 1750-1, Miki-cho, Kita-gun, Kagawa 761-0793, Japan.
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Dohmoto K, Hojo S, Fujita J, Yang Y, Ueda Y, Bandoh S, Yamaji Y, Ohtsuki Y, Dobashi N, Ishida T, Takahara J. The role of caspase 3 in producing cytokeratin 19 fragment (CYFRA21-1) in human lung cancer cell lines. Int J Cancer 2001; 91:468-73. [PMID: 11251967 DOI: 10.1002/1097-0215(200002)9999:9999<::aid-ijc1082>3.0.co;2-t] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The CYFRA 21-1 assay, which detects cytokeratin 19 (CK19) fragment, is widely used as a tumor marker for lung cancer, particularly non-small cell lung cancer. However, the reason that some lung cancer cell lines release CYFRA 21-1 in culture supernatants and others do not remains unclear. We hypothesized that the release of CYFRA 21-1 might be related to the expression of CK19 and caspase 3. In order to prove this, the quantities of mRNA for CK19 were evaluated by the competitive reverse transcriptase-polymerase chain reaction (RT-PCR). CK19 protein synthesis was also evaluated by Western blotting and immunohistochemistry, and the levels of CYFRA 21-1 in the culture supernatant were measured by an immunoradiometric assay. The expression of mRNA for caspase 3 was evaluated by the RT-PCR, and caspase 3 protein synthesis was also evaluated by immunohistochemistry. In 13 lung cancer cell lines, the amounts of mRNA for CK19 correlated with the levels of CYFRA 21-1 in culture supernatants, results of Western blotting for CK19, and positivities of immunohistochemistry for CK19. In 5 cell lines that produced a significant amount of CYFRA 21-1, the level of CYFRA 21-1 correlated with the positivity of RT-PCR for caspase 3 and immunohistochmistry for caspase 3. This suggests that caspase 3 played a role in the formation of CYFRA 21-1. In addition, the specific inhibitor of caspase 3 significantly inhibited the release of CYFRA 21-1 in culture supernatants. In conclusion, we demonstrate that caspase 3, which cleaves several intermediate filaments and carries out cell apoptosis, played an important role in producing CYFRA 21-1 in human lung cancer cell lines.
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Affiliation(s)
- K Dohmoto
- First Department of Internal Medicine, Kagawa Medical University, 1750-1, Miki-cho, Kita-gun, Kagawa, 761-0793, Japan
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Dohmoto K, Hojo S, Fujita J, Ueda Y, Bandoh S, Yamaji Y, Ohtsuki Y, Dobashi N, Takahara J. Mechanisms of the release of CYFRA21-1 in human lung cancer cell lines. Lung Cancer 2000; 30:55-63. [PMID: 11008010 DOI: 10.1016/s0169-5002(00)00125-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The CYFRA 21-1 assay which detects cytokeratin 19 (CK19) fragment is widely used as a tumor marker for lung cancer. However, the reason why some lung cancer cell lines release CK19 fragment in culture supernatants and others do not, remains unclear. It was hypothesized that the release of CK19 fragment may be elucidated by the expression of mRNA for CK19. In order to prove this, the mRNA for CK19 was quantitatively evaluated by the competitive reverse transcriptase-polymerase chain reaction (competitive RT-PCR). The level of CYFRA 21-1 in the culture supernatant was measured by an immunoradiometric assay. CK19 protein synthesis was evaluated by a Western blotting and immunohistochemistry. Fourteen lung cancer cell lines were evaluated, and the amount of mRNA correlated well with the level of CYFRA 21-1 in culture supernatants. Analysis of genomic DNA for CK19 demonstrated that three cell lines which could not produce CYFRA 21-1, conjectured that some abnormalities in exon 1 or the 5'-region upstream from exon 1. In conclusion, it was demonstrated that the release of CK19 fragment was closely related to the expression of mRNA for CK19, and the possibility that genomic change of CK19 DNA down-regulated the expression of mRNA for CK19 was suggested.
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Affiliation(s)
- K Dohmoto
- First Department of Internal Medicine, Kagawa Medical University, Miki-cho, Kita-gun, Japan
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Nisman B, Lafair J, Heching N, Lyass O, Baras M, Peretz T, Barak V. Evaluation of tissue polypeptide specific antigen, CYFRA 21-1, and carcinoembryonic antigen in nonsmall cell lung carcinoma: does the combined use of cytokeratin markers give any additional information? Cancer 1998; 82:1850-9. [PMID: 9587116 DOI: 10.1002/(sici)1097-0142(19980515)82:10<1850::aid-cncr6>3.0.co;2-r] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND Recently developed tissue polypeptide specific antigen (TPS) and CYFRA 21-1 assays determine the soluble cytokeratin 18 and 19 fragments, respectively, in serum. The authors compared the value of TPS, CYFRA 21-1, and carcinoembryonic antigen (CEA) for the diagnosis, staging, prognosis, and monitoring of patients with nonsmall cell lung carcinoma (NSCLC). METHODS The study included 85 patients with benign lung diseases and 94 patients with NSCLC. TPS, CYFRA 21-1, and CEA serum levels were measured with commercial kits. RESULTS The following were demonstrated: 1) CYFRA 21-1 and TPS levels, but not CEA levels, differed significantly between NSCLC patients with operable disease (Stages I-IIIA) and those with inoperable disease (Stages IIIB-IV). 2) The correlation coefficient between CYFRA 21-1 and TPS increased with the progression of NSCLC from Stages I-IIIA (r = 0.41, P = 0.04) to Stages IIIB-IV (r = 0.70, P < 0.001). 3) Multivariate analysis identified TPS and CYFRA 21-1 as significant predictors of survival, with relative risks of 2.57 (P = 0.001) and 2.05 (P = 0.01), respectively. For cases in which both cytokeratin markers were positive, the relative risk was 6.4 (P < 0.0001) compared with cases in which both were negative. 4) For the group with inoperable disease, the combined use of TPS and CYFRA 21-1 allowed for the definition of 3 sets of patients with significantly different median survival times (14.3 months vs. 7.4 months vs. 2.6 months). 5) The percentages of marker evaluations concordant with results of clinical assessments of response to therapy were 75.0%, 72.2%, and 61.1% for CYFRA 21-1, TPS, and CEA, respectively. CONCLUSIONS These findings suggest that, for NSCLC patients, CYFRA 21-1 and TPS are significant prognostic factors and effective monitors of therapy. The combined use of these cytokeratin markers may provide additional information for prognosis.
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Affiliation(s)
- B Nisman
- Oncology Department, Hadassah University Hospital, Jerusalem, Israel
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Höchtlen-Vollmar W, Gruber R, Bodenmüller H, Felber E, Lindemann F, Passlick B, Schlimok G, Pantel K, Riethmüller G. Occult epithelial tumor cells detected in bone marrow by an enzyme immunoassay specific for cytokeratin 19. Int J Cancer 1997; 70:396-400. [PMID: 9033645 DOI: 10.1002/(sici)1097-0215(19970207)70:4<396::aid-ijc4>3.0.co;2-r] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The presence of isolated carcinoma cells detected immunocytochemically in bone marrow has been shown to be of prognostic relevance for cancer patients. Unfortunately, the immunocytochemical method (ICC) is laborious and depends on the subjective interpretation of the individual investigator. Therefore, an immunoassay was designed for detection of cytokeratin 19 (CK19). By analyzing blood samples from 52 healthy volunteers and 40 bone-marrow aspirates from control patients, a cut-off point of 250 pg/ml CK19 was determined. Application of this cut-off point enabled a specificity of 95% to be shown for bone marrow and of nearly 100% for venous blood. The assay detected 10 HT-29 colon-carcinoma cells among 5 x 10(6) peripheral-blood leukocytes. In comparison with controls, bone-marrow samples of cancer patients were found to have significantly elevated levels of CK19 (p < 0.05). In the analysis of 386 marrow aspirates of cancer patients, a significant concordance of ELISA and ICC was observed (chi 2 = 18.3; p < 0.001). Both procedures, nevertheless, differed in 147 (38%) samples, of which more than two thirds (101) were only ELISA-positive. The CK status detected by ELISA did not correlate with the TNM stage and the histological grading. The established immunoassay allowed sensitive and specific detection of disseminated epithelial tumor cells and appeared to be faster, less laborious and more objective than ICC. Follow-up studies are required to assess the prognostic relevance of this ELISA before it can be applied as a routine method for monitoring of minimal residual epithelial cancer.
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Abstract
One major obstacle to the successful treatment of epithelial derived tumors, such as breast and prostate carcinoma, is the presence of a multiple drug resistance phenotype. The drug resistance which is observed in growing epithelial derived cancer cells could either be an intrinsic, selected and/or an acquired characteristic. A survey of the survival data from several laboratories suggests that epithelial derived tumor cells, which have never been challenged with damaging agents, are in some cases 10 to 2,000 times more resistant to various chemotherapeutic agents as compared to hematopoietic cell lines. An intrinsic characteristic of epithelial cells is their resistance to the lethal effects of multiple types of damaging agents. A major feature of epithelial derived tumors is the expression of the intermediate filament type proteins known as cytokeratin. The simplest cytokeratin combination, cytokeratin 8 and 18, is a major cytoplasmic element within the cells of epithelial derived tumors. Earlier work showed that cytokeratin could be modified by mitoxantrone, a chemotherapeutic agent used in the treatment of breast cancer. Increasing data indicates that the intrinsic drug resistance phenotype is due in part to the presence of continued expression of the cytokeratin 8 and 18. The cytokeratin dependent drug resistance (C-MDR) has been observed in two different cell types that were engineered to contain cytokeratin 8 and 18 expression. The cytokeratin monomers are known to self assemble into intermediate filament networks as shown by numerous basic studies. Experiments using transfected cell lines which are unable to assemble networks indicated that C-MDR does not depend upon the formation of an intermediate filament network. Selection of cytokeratin network defective tumor cells did not increase their sensitivity to chemotherapeutic agents. These data are interesting since it suggests that the C-MDR phenotype is not dependent upon the structural nature (i.e. network forming ability) of the cytokeratin. Our current working hypothesis is that the interaction of the damaging agent with cytokeratin may initiate signaling response(s) for cell survival.
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Affiliation(s)
- A E Cress
- Department of Radiation Oncology, Arizona Cancer Center, University of Arizona, Tucson 85724, USA
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Böttger V, Stasiak PC, Harrison DL, Mellerick DM, Lane EB. Epitope mapping of monoclonal antibodies to keratin 19 using keratin fragments, synthetic peptides and phage peptide libraries. EUROPEAN JOURNAL OF BIOCHEMISTRY 1995; 231:475-85. [PMID: 7543411 DOI: 10.1111/j.1432-1033.1995.tb20721.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
To generate tools for monitoring processing and folding in keratin intermediate filaments, a group of monoclonal antibodies reacting with the intermediate filament protein keratin 19 were studied using different approaches to define the structure and localization of their epitopes. The binding pattern to bacterially expressed human keratin 19 fragments allowed the definition of minimal amino acid sequences required for antibody binding. The screening of overlapping 15-residue peptides confirmed and further specified the epitope locations for a subset of the tested antibodies. In addition, the epitope of an antibody with apparent species-restricted specificity (LE64) was revealed by isolating and characterizing a full-length keratin 19 clone from a PtK2 cDNA library. Taken together with species cross-reactivity of individual antibodies and sequence information obtained by probing a phage display library, specific amino acid residues could be highlighted as likely to be involved in the antibody binding.
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Affiliation(s)
- V Böttger
- Department of Anatomy and Physiology, University of Dundee, Scotland
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Abstract
Soluble forms of keratins in human sera seem to be useful analytes for the monitoring of cancer patients. CYFRA 21-1 is a new test measuring keratin 19 in human blood. The test was developed as sandwich ELISA based on two monoclonal antibodies, both reacting with keratin 19. The epitopes recognised by the antibodies are located on the rod region of the molecule. In sera from malignant patients CYFRA 21-1 detects immunoreactive compounds which appear to be larger than keratin 19 itself, indicating the presence of oligomers in these sera. In a comparison study the reactivity of other keratin tests (TPA, TPS, TPAcyk) with the keratins 8, 18 and 19 were measured both in solution and on immunoblots. The reactivity pattern was found to be different what may explain the different diagnostic properties of the individual tests.
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Affiliation(s)
- H Bodenmüller
- Boehringer Mannheim GmbH, Research Center Tutzing, Germany
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