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Seufferlein T, Lausser L, Stein A, Arnold D, Prager G, Kasper-Virchow S, Niedermeier M, Müller L, Kubicka S, König A, Büchner-Steudel P, Wille K, Berger AW, Kestler AMR, Kraus JM, Werle SD, Perkhofer L, Ettrich TJ, Kestler HA. Prediction of resistance to bevacizumab plus FOLFOX in metastatic colorectal cancer-Results of the prospective multicenter PERMAD trial. PLoS One 2024; 19:e0304324. [PMID: 38875244 PMCID: PMC11178165 DOI: 10.1371/journal.pone.0304324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Accepted: 05/08/2024] [Indexed: 06/16/2024] Open
Abstract
BACKGROUND Anti-vascular endothelial growth factor (VEGF) monoclonal antibodies (mAbs) are widely used for tumor treatment, including metastatic colorectal cancer (mCRC). So far, there are no biomarkers that reliably predict resistance to anti-VEGF mAbs like bevacizumab. A biomarker-guided strategy for early and accurate assessment of resistance could avoid the use of non-effective treatment and improve patient outcomes. We hypothesized that repeated analysis of multiple cytokines and angiogenic growth factors (CAFs) before and during treatment using machine learning could provide an accurate and earlier, i.e., 100 days before conventional radiologic staging, prediction of resistance to first-line mCRC treatment with FOLFOX plus bevacizumab. PATIENTS AND METHODS 15 German and Austrian centers prospectively recruited 50 mCRC patients receiving FOLFOX plus bevacizumab as first-line treatment. Plasma samples were collected every two weeks until radiologic progression (RECIST 1.1) as determined by CT scans performed every 2 months. 102 pre-selected CAFs were centrally analyzed using a cytokine multiplex assay (Luminex, Myriad RBM). RESULTS Using random forests, we developed a predictive machine learning model that discriminated between the situations of "no progress within 100 days before radiological progress" and "progress within 100 days before radiological progress". We could further identify a combination of ten out of the 102 CAF markers, which fulfilled this task with 78.2% accuracy, 71.8% sensitivity, and 82.5% specificity. CONCLUSIONS We identified a CAF marker combination that indicates treatment resistance to FOLFOX plus bevacizumab in patients with mCRC within 100 days prior to radiologic progress.
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Affiliation(s)
- Thomas Seufferlein
- Department of Internal Medicine I, Ulm University Hospital, Ulm, Germany
| | - Ludwig Lausser
- Institute of Medical Systems Biology, Ulm University, Ulm, Germany
- Faculty of Computer Science, Technische Hochschule Ingolstadt, Ingolstadt, Germany
| | - Alexander Stein
- Hematology-Oncology Practice Eppendorf, University Cancer Center Hamburg, Hamburg, Germany
| | - Dirk Arnold
- Asklepios Cancer Center Hamburg, AK Altona, Hamburg, Germany
| | - Gerald Prager
- Comprehensive Cancer Center Vienna, Medical University of Vienna, Vienna, Austria
| | - Stefan Kasper-Virchow
- Medical Oncology, University Hospital Essen West German Cancer Center, Essen, Germany
| | | | | | - Stefan Kubicka
- Cancer Center Reutlingen, Reutlingen Hospital, Reutlingen, Germany
| | - Alexander König
- Department of Gastroenterology, Gastrointestinal Oncology and Endocrinology, University Medical Center Goettingen, Göttingen, Germany
| | | | - Kai Wille
- Hematology, Oncology, University Hospital Ruhr-University-Bochum, Minden, Germany
| | - Andreas W Berger
- Department of Internal Medicine I, Ulm University Hospital, Ulm, Germany
| | | | - Johann M Kraus
- Institute of Medical Systems Biology, Ulm University, Ulm, Germany
| | - Silke D Werle
- Institute of Medical Systems Biology, Ulm University, Ulm, Germany
| | - Lukas Perkhofer
- Department of Internal Medicine I, Ulm University Hospital, Ulm, Germany
| | - Thomas J Ettrich
- Department of Internal Medicine I, Ulm University Hospital, Ulm, Germany
| | - Hans A Kestler
- Institute of Medical Systems Biology, Ulm University, Ulm, Germany
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Vizoso FJ, Fagilde MC, Corte MD, Corte MG, Gava R, Bongera M, Allende MT, García-Muñiz JL. Cytosolic Levels of An Estrogen-Induced Breast Cancer-Associated Peptide (TFF1/pS2) in Colorectal Cancer: Clinical Significance and Relationship with Steroid Receptors. Int J Biol Markers 2018; 18:301-10. [PMID: 14756547 DOI: 10.1177/172460080301800409] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Background The Trefoil Factor 1 (TFF1/pS2), a peptide consisting of 60 amino acids, is the most abundant estrogen-induced messenger RNA in MCF-7 breast cancer cells and is also expressed by colorectal carcinomas. The objective of this work was to evaluate the cytosolic TFF1 content in colorectal carcinomas, its possible relationship with estrogen and progesterone receptors as well as with clinicopathological tumor parameters, and its potential prognostic significance. Methods Cytosolic TFF1 levels were examined by immunoradiometric assay in 178 patients with resectable colorectal cancer. The mean follow-up period was 32 months. Results There was a wide variability of cytosolic TFF1 levels in tumor-surrounding mucosa samples (0.09-42.5 ng/mg protein) as well as in tumors (0.01-270 ng/mg protein). Comparison of paired mucosa and carcinoma samples showed significantly higher TFF1 levels in tumors (mean: 17.1 ng/mg protein) than in mucosa samples (10 ng/mg protein) (p=0.027). TFF1 levels were significantly higher in mucosa samples surrounding distal colon and rectal tumors (p=0.0001) and in tumor samples obtained from older patients (p=0.007). However, there were no significant differences in tumor TFF1 levels with respect to clinicopathological parameters such as the patient's sex, tumor location, stage, histological grade, ploidy, S-phase, or tumor estrogen and progesterone receptors. In addition, there was no significant relationship between tumor TFF1 levels and disease outcome. Conclusions TFF1 may play an as yet undetermined role in the tumorigenesis of colorectal carcinomas. However, cytosolic levels of TFF1 do not seem to have any prognostic significance in colorectal carcinomas.
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Affiliation(s)
- F J Vizoso
- Servicio de Cirugía General, Hospital de Jove, , Asturias, Gijón, Spain.
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Mashiko S, Kitatani K, Toyoshima M, Ichimura A, Dan T, Usui T, Ishibashi M, Shigeta S, Nagase S, Miyata T, Yaegashi N. Inhibition of plasminogen activator inhibitor-1 is a potential therapeutic strategy in ovarian cancer. Cancer Biol Ther 2015; 16:253-60. [PMID: 25587663 PMCID: PMC4623014 DOI: 10.1080/15384047.2014.1001271] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Revised: 10/14/2014] [Accepted: 12/18/2014] [Indexed: 10/22/2022] Open
Abstract
Plasminogen activator inhibitor (PAI)-1 is predictive of poor outcome in several types of cancer. The present study investigated the biological role for PAI-1 in ovarian cancer and potential of targeted pharmacotherapeutics. In patients with ovarian cancer, PAI-1 mRNA expression in tumor tissues was positively correlated with poor prognosis. To determine the role of PAI-1 in cell proliferation in ovarian cancer, the effects of PAI-1 inhibition were examined in PAI-1-expressing ovarian cancer cells. PAI-1 knockdown by small interfering RNA resulted in significant suppression of cell growth accompanied with G2/M cell cycle arrest and intrinsic apoptosis. Similarly, treatment with the small molecule PAI-1 inhibitor TM5275 effectively blocked cell proliferation of ovarian cancer cells that highly express PAI-1. Together these results suggest that PAI-1 promotes cell growth in ovarian cancer. Interestingly, expression of PAI-1 was increased in ovarian clear cell carcinoma compared with that in serous tumors. Our results suggest that PAI-1 inhibition promotes cell cycle arrest and apoptosis in ovarian cancer and that PAI-1 inhibitors potentially represent a novel class of anti-tumor agents.
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Affiliation(s)
- Satsuki Mashiko
- Department of Obstetrics and Gynecology; Tohoku University Graduate School of Medicine; Sendai, Japan
| | - Kazuyuki Kitatani
- Department of Obstetrics and Gynecology; Tohoku University Graduate School of Medicine; Sendai, Japan
- Tohoku Medical Megabank Organization; Tohoku University; Sendai, Japan
| | - Masafumi Toyoshima
- Department of Obstetrics and Gynecology; Tohoku University Graduate School of Medicine; Sendai, Japan
| | - Atsuhiko Ichimura
- Division of Molecular Medicine and Therapy, United Centers for Advanced Research and Translational Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Takashi Dan
- Division of Molecular Medicine and Therapy, United Centers for Advanced Research and Translational Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Toshinori Usui
- Department of Obstetrics and Gynecology; Tohoku University Graduate School of Medicine; Sendai, Japan
- Tohoku Medical Megabank Organization; Tohoku University; Sendai, Japan
| | - Masumi Ishibashi
- Department of Obstetrics and Gynecology; Tohoku University Graduate School of Medicine; Sendai, Japan
| | - Shogo Shigeta
- Department of Obstetrics and Gynecology; Yamagata University Faculty of Medicine; Yamagata, Japan
| | - Satoru Nagase
- Department of Obstetrics and Gynecology; Tohoku University Graduate School of Medicine; Sendai, Japan
| | - Toshio Miyata
- Division of Molecular Medicine and Therapy, United Centers for Advanced Research and Translational Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Nobuo Yaegashi
- Department of Obstetrics and Gynecology; Tohoku University Graduate School of Medicine; Sendai, Japan
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del Casar JM, Corte MD, Alvarez A, García I, Bongera M, González LO, García-Muñiz JL, Allende MT, Astudillo A, Vizoso FJ. Lymphatic and/or blood vessel invasion in gastric cancer: relationship with clinicopathological parameters, biological factors and prognostic significance. J Cancer Res Clin Oncol 2007; 134:153-61. [PMID: 17628829 DOI: 10.1007/s00432-007-0264-3] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2007] [Accepted: 06/07/2007] [Indexed: 02/06/2023]
Abstract
BACKGROUND Lymphatic and/or blood vessel tumoral invasion (LBVI) is a common histopathologic finding of gastric carcinomas, which could make it an additional cost efficient marker and help in the detection of patients at risk for recurrence. MATERIALS AND METHODS The subjects of this study were 144 patients with primary gastric adenocarcinoma, who consecutively underwent surgery. LBVI was evaluated by H&E staining and complementary with immunohistochemical staining with anti-CD34. Intratumoral levels of EGFR were analyzed with a radioligand technique, whereas c-erbB-2 and tPA were determined by ELISA methods; pS2, cathepsin D and hyaluronic acid by immunoradiometric assays; and VEGFR-1 and -2 by immunohistochemical assays. The mean follow-up period for these patients was 33.1 months. RESULTS LBVI was present in 46 patients (31.9%). The presence of LBVI correlated significantly with tumor stage, lymph node involvement, surgical resectability, histological type and histological grade, being present in a higher percentage among II-IV tumor stage (P = 0.0001), poorly differentiated (P = 0.01), diffuse type (P = 0.009), R1-R2 (P = 0.002) and lymph node-positive (P = 0.005) tumors. In addition, statistical analysis demonstrated that LBVI was significantly associated with a poorer overall patients' survival in the univariate analysis (P = 0.0001) as well as in the multivariate analysis (P = 0.009). However, our results failed to show any significant relationship between LBVI and any of the intratumoral biological parameters studied. CONCLUSION LBVI provides additional useful information that could be applied to identify gastric cancer patients at risk for recurrence, who might be candidates for further adjuvant therapies.
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Scicolone G, Sanchez V, Vauthay L, Fuentes F, Scicolone A, Scicolone L, Rapacioli M, Flores V. Tissue-type plasminogen activator activity in morphologically normal tissues adjacent to gastrointestinal carcinomas is associated with the degree of tumor progression. J Cancer Res Clin Oncol 2005; 132:309-19. [PMID: 16369808 DOI: 10.1007/s00432-005-0066-4] [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] [Received: 04/19/2005] [Accepted: 11/29/2005] [Indexed: 10/25/2022]
Abstract
PURPOSE To investigate whether the level of plasminogen activator (PA) activity assayed in gastrointestinal carcinomas and the "morphologically normal tissues" adjacent to them is associated with the degree of tumor progression. METHODS Tumor and "normal tissues" were obtained from gastrointestinal surgical samples to assess urokinase-type (u-PA) and tissue-type plasminogen activator (t-PA) activities by radial caseinolytic assay and the expression of PA inhibitor-1 (PAI-1) by ELISA. We compared the PA system between the tumor and "normal tissues" and we investigated the existence of correlations between: (a) PA production in the tumor and "normal tissues", (b) different components of the PA system, and (c) PA system and the degree of tumor progression. RESULTS (1) Total PA activity, u-PA activity and PAI-1 expression are significantly higher in tumor than in "normal tissues", whereas t-PA activity does not differ between them. (2) Total PA activity mainly correlates with u-PA activity in tumor tissues and similarly with u-PA and t-PA activities in "normal tissues". (3) There is a significant association between t-PA activity in tumor and "normal tissues" and the degree of tumor progression. CONCLUSIONS "Morphologically normal tissues" adjacent to carcinomas present abnormal t-PA activity that is associated with the degree of tumor progression. Assaying of this activity could be useful as a predictive parameter.
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Affiliation(s)
- Gabriel Scicolone
- School of Medicine, Institute of Cell Biology and Neurosciences, Prof E De Robertis, University of Buenos Aires, Paraguay 2155, 1121, Buenos Aires, Argentina.
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Corte MD, Vérez P, Rodríguez JC, Roibás A, Domínguez ML, Lamelas ML, Vázquez J, García Muñiz JL, Allende MT, González LO, Fueyo A, Vizoso F. Tissue-type plasminogen activator (tPA) in breast cancer: relationship with clinicopathological parameters and prognostic significance. Breast Cancer Res Treat 2005; 90:33-40. [PMID: 15770524 DOI: 10.1007/s10549-004-2624-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
BACKGROUND Tissue-type plasminogen activator (tPA) is a serine protease primarily involved in the intravascular dissolution of blood clots. High intratumoral tPA levels are associated with prognosis in several human tumors. In addition, tPA has been shown to be an estrogen-inducible protein in human breast cancer cell lines. The aim of the present study was to analyze the cytosolic tPA content in primary breast carcinomas and its potential clinical value. MATERIALS AND METHODS tPA was measured by a solid-phase enzyme immunoassay in tumor cytosol samples obtained from 800 patients with breast cancer. The median follow-up period was of 49.2 months. RESULTS Cytosolic tPA levels ranged widely in breast carcinomas (median: 3.9; range: 0.1- 315.3 ng/mg protein). tPA levels were significantly lower in large tumors, as well as in those showing poor differentiation, estrogen (ER) or PgR-negativity, aneuploidy, or a high S-phase fraction. In addition, low tPA intratumoral levels were associated with a high probability of both shortened relapse-free and overall survival in all patients and in the subgroup with node-negative tumors. However, our results did not show any significant relationship between intratumoral tPA levels and prognosis in the different subgroups of patients, stratified according to the type of systemic adjuvant therapy received (chemotherapy, tamoxifen or chemotherapy plus sequential tamoxifen). CONCLUSION The results of the present investigation indicate that low intratumoral tPA levels are associated with aggressiveness and poor prognosis in breast cancer patients. However, the study suggests that tPA levels do not predict response to systemic adjuvant therapy.
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Affiliation(s)
- M Daniela Corte
- Instituto Universitario de Oncología del Principado de Asturias, Oviedo, Spain
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7
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Borgfeldt C, Bendahl PO, Fernö M, Casslén B. High preoperative plasma concentration of tissue plasminogen activator (tPA) is an independent marker for shorter overall survival in patients with ovarian cancer. Gynecol Oncol 2003; 91:112-7. [PMID: 14529669 DOI: 10.1016/s0090-8258(03)00493-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
OBJECTIVE The objective was to evaluate the preoperative blood concentration of tissue plasminogen activator (tPA) as a discriminator between malignant and benign ovarian tumors, and as a potential marker of postoperative prognosis in patients with ovarian cancer. METHODS AND MATERIAL The concentration of tPA was assayed with ELISA (Imulyse Biopool) in preoperative plasma samples obtained from 111 patients with adnexal lesions. Tumors were classified as benign (n = 25), borderline malignant (n = 11), well-differentiated (G1, n = 22), moderately differentiated (G2, n = 11), and poorly differentiated malignant (G3, n = 42). The median follow-up time of patients with malignant tumors was 5.6 years (range 2.1-13.2 years) and 37 patients died during the follow-up period. RESULTS Patients with moderately and poorly differentiated tumors had higher levels of plasma tPA compared to those with well-differentiated tumors (P = 0.004 and P = 0.005). No significant differences in the plasma tPA levels were observed between patients with benign, borderline, and well-differentiated tumors. The tPA levels were not different between stages nor within stage Ia-c. In a multivariate Cox proportional hazards model including stage, grade, age, and plasma tPA dichotomized at the median (> or =9 vs <9 ng/mL), high levels of tPA were significantly associated with shorter survival: HR = 4.4 (95% CI 2.0-9.8, P = 0.0003). In the univariate analyze high levels of tPA showed HR = 4.5 (95% CI 2.1-9.6, P = 0.0003). CONCLUSIONS High concentration of plasma tPA was an independent marker for poor prognosis in patients with ovarian cancer in our study. Plasma tPA did, however, not discriminate between benign and malignant adnexal lesions.
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Affiliation(s)
- Christer Borgfeldt
- Department of Obstetrics and Gynecology, University Hospital Lund, Sweden.
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Graziano F, Cascinu S. Prognostic molecular markers for planning adjuvant chemotherapy trials in Dukes' B colorectal cancer patients: how much evidence is enough? Ann Oncol 2003; 14:1026-38. [PMID: 12853343 DOI: 10.1093/annonc/mdg284] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The benefit of postoperative adjuvant chemotherapy in patients with Dukes' B colorectal cancer is still uncertain and its routine use is not recommended. Prognostic biomarkers may be useful for identifying high-risk patients with resected, node-negative disease, and this stratification may represent an innovative strategy for designing adjuvant chemotherapy trials. Featured prognostic molecular markers can be divided into the following categories: cell proliferation indices (Ki-67, Mib-1, proliferating cell nuclear antigen); oncogenes/tumor suppressor genes [p53, K-ras, Deleted in Colorectal Cancer (DCC), Bcl-2, c-erbB2]; DNA repair (microsatellite instability); markers of angiogenesis (vascular count, vascular endothelial growth factor); markers of invasion/metastasis (plasminogen-related molecules, matrix metalloproteinases); and biochemical markers (thymidylate synthase). Studies that have investigated their prognostic role in Dukes' B colorectal cancer patients are reviewed here. Current data do not provide sufficient evidence for the incorporation of available prognostic biomarkers into clinical practice. However, a biomarker-based approach could be an effective strategy for improving results of postoperative adjuvant treatments in high-risk Dukes' B colorectal cancer patients. Markers of altered DCC function have shown promising prognostic role and sufficient prevalence in retrospective investigations and they deserve further assessment in prospective studies.
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Affiliation(s)
- F Graziano
- Medical Oncology Unit, Hospital of Urbino, Urbino, Italy.
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Sanz L, Vizoso F, Vérez P, Allende MT, Corte MG, Abdel-Lah O, Martín A, García-Muñíz JL. Prognostic significance of tissue-type plasminogen activator (tPA) content in gastric cancer and surrounding mucosa. Int J Biol Markers 2002; 17:169-76. [PMID: 12408467 DOI: 10.1177/172460080201700305] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AIMS We analyzed the tPA content in primary gastric carcinomas and surrounding mucosa in order to assess the relationship between tPA content, clinicopathological tumor characteristics, and estrogen and progesterone receptor content. We evaluated the prognostic value of this serine protease in gastric cancer patients. PATIENTS AND METHODS 122 resected gastric neoplasms and 95 adjacent mucosa samples were studied. The tPA content was measured in cytosol by an ELISA method. Cytosolic ER and PgR were measured with a solid phase enzyme immunoassay. RESULTS Cytosolic tPA levels in neoplastic tissues (median 1.0 ng/mg prot) were significantly lower (p=0.002) than those found in paired mucosa samples (median 2.3 ng/mg prot). There was no significant association between tPA levels and clinicopathological parameters or PgR content, but tPA levels were significantly correlated with ER content. The intermediate-tPA-content group, corresponding to samples with between 0.3 and 1.70 ng/mg protein, proved to have a significantly high risk of relapse. CONCLUSIONS We found a wide variability in tPA levels in gastric carcinoma and adjacent mucosa samples, with significantly decreased levels in tumors and a significantly positive relationship between tPA levels and ER status. There was a non-monotonic relationship between tPA levels and prognosis in patients with gastric cancer.
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Affiliation(s)
- L Sanz
- General Surgery Service, Hospital Central de Asturias, Oviedo, Spain.
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Ruibal A, Núñez MI, Del Río MC, Rodríguez J, Alvarez De Linera JF. [Usefulness of cytosolic tissue-type plasminogen activator levels in lung adenocarcinomas]. Med Clin (Barc) 2002; 119:1-3. [PMID: 12061997 DOI: 10.1016/s0025-7753(02)73295-8] [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: 11/24/2022]
Abstract
BACKGROUND We aimed at studying the behavior of cytosol tissue-type plasminogen activator (t-PA) levels in lung adenocarcinomas and their correlation with other clinical and biological parameters. MATERIAL AND METHOD t-PA cytosol levels were determined using EIA (Boehringer Mannheim. Germany) in 59 samples of lung adenocarcinoma and in 16 samples of normal lung tissue from the same patients. Cathepsin D, CA125, pS2, hyaluronic acid (HA), free beta subunit of chorionic gonadotropin hormone and neuron specific enolase (NSE) cytosol concentrations were determined. We also determined the concentrations of HA, erbB2 oncoprotein, epidermal growth factor receptor (EGFR), CD44s, CD44v5 and CD44v6 in cell surfaces. The following parameters were considered: clinical stage, ploidy, cellular S-phase fraction and histological grade. RESULTS In adenocarcinomas, t-PA cytosol levels ranged from 0.1 to 14.6 ng/mg prot. (median, 1.4). These levels were lower than those in normal lung tissue (r, 0.1-18.6; median, 2.95 ng/mg prot.) but did not reach statistical significance. On the other hand, t-PA concentrations decreased as the clinical stage increased and were higher in stage I than stage II-III (p = 0.080) and stage III (p = 0.0622). No significant differences of t-PA levels were observed when the histological grade, ploidy and S-phase were considered. Adenocarcinomas with high t-PA values (> 3.7 ng/mg prot., representing the 75th percentile of the whole group), had lower CA125 (p = 0.015) and erbB2 oncoprotein (p = 0.087) concentrations. CONCLUSIONS These results suggest that cytosol t-PA levels are negatively correlated with tumor size in lung adenocarcinomas. However, the usefulness of t-PA as a prognostic factor needs to be clarified in further studies.
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Affiliation(s)
- Alvaro Ruibal
- Laboratorio de Biología Tumoral Fundación Jiménez Díaz, Departamento de Medicina Nuclear, Fundación Jiménez Díaz, Madrid, Spain
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