C-myc mRNA Expression in Epithelial Ovarian Carcinomas in Relation to Estrogen Receptor Status, Metastatic Spread, Survival Time, FIGO Stage, and His…

1998

Recently, it has been suggested that c-myc expression might correlate with estrogen receptor (ER) status and metastatic spread in ovarian cancer. In this study, expression of c-myc mRNA in 90 epithelial ovarian carcinomas was determined using the S1 nuclease protection assay. Expression of c-myc mRNA was detectable in 27 of 90 tumors. There was no significant association between c-myc mRNA expression and metastatic spread, survival time, FIGO stage, or histologic grade and type. C-myc mRNA was expressed in 45% of ER-positive tumors but only 24% of ER-negative tumors (p = 0.094; Fisher's exact test). Similarly, 44% of progesterone receptor (PR)-positive and 23% of PR-negative tumors expresse…

Evaluation of c-erbB-2-oncogene expression as a prognostic factor in ovarian cancer

1995

Analysis of DNA single-strand breaks in human venous blood: a technique which does not require isolation of white blood cells.

1997

For DNA strand break analysis in human white blood cells, usually metrizoate-Ficoll centrifugation is used to isolate mononuclear cells. This procedure is time-consuming and requires at least 20 ml of blood per sample. Therefore, we developed a technique which does not require isolation of white blood cells prior to DNA strand break analysis by alkaline elution (direct method). The sensitivity of this new technique was compared to that of the standard method, which includes isolation of mononuclear blood cells. A statistically significant increase in sensitivity was observed using the direct method. After in vitro gamma-irradiation of venous blood, an increase in the elusion rate of 7.7 × 1…

mdm2 mRNA expression is associated with survival in ovarian cancer

1997

Expression of mdm-2 mRNA was measured in 90 ovarian-cancer tissue specimens using the S1 nuclease assay, to investigate a possible association between MDM2 expression and prognosis. mdm-2 mRNA expression was an independent prognostic factor for patients with primary ovarian cancer, FIGO (International Federation of Gynecology and Obstetrics) stages III and IV (n = 57), who all received chemotherapy with carboplatin or cisplatin and cyclophosphamide. Median survival time for patients (FIGO stages III and IV) with no detectable expression of mdm-2 mRNA (n = 14) was 171 days, as compared with 839 days for patients (n = 43) with detectable mdm-2 mRNA (p = 0.0194; log-rank test). However, no ass…

ErbB-3 predicts survival in ovarian cancer.

2006

Background HER3 (erbB-3) is a member of the epidermal growth factor receptor (EGFR) family. After dimerization with other members of the EGFR family several signal transduction cascades can be activated, including phosphoinosite 3′-kinase (PI3-K)/Akt and extracellular signal-regulated kinase (ERK1/2). Here, we studied a possible association between HER3 expression and prognosis in patients with ovarian cancer. Methods Tumor tissue of 116 consecutive patients diagnosed with primary epithelial ovarian cancer between 1986 and 1995 was analyzed immunohistochemically for HER3 expression. A possible influence of HER3 expression on survival was studied by multivariate Cox regression adjusting for …

Prognostic significance of c-erB-2 mRNA in ovarian carcinoma.

1996

The oncogene specific mRNA of c-erbB-2 was detected by the S1 nuclease protection assay in 95 ovarian cancer specimens. In 79 primary carcinomas, we found 16 (20%) with strong expression, 13 (17%) with weak expression, 4 (5%) with very weak expression, and 46 (58%) with no expression. In 3 of 16 recurrencies (19%) a strong expression of c-erbB-2 mRNA was detected, in 2 (12%) weak expression was detected, and in 11 (69%) no expression of c-erbB-2 mRNA was detected. Kaplan-Meier analysis revealed no significant association between strong expression of c-erbB-2 mRNA and survival of the 79 patients with primary cancer. However, in the subgroup of patients with FIGO (International Federation of …

(A)symptomatic necrotizing arteritis of the female genital tract.

2000

Abstract Aims: The vasculitides represent a heterogenous set of disorders that differ in prognosis and response to therapy. Beside systemic vasculitides, the development of localized forms of arteritis is well known though uncommon and the etiopathogenesis is not yet definitely clear. Methods: Patients with necrotizing arteritis of the female genital tract proven by histology are studied in a retrospective analysis. Results: Three cases of necrotizing arteritis with histological features of panarteritis nodosa apparently confined to the female genital tract are presented. None of these patients had prior history of systemic vasculitis. The acute necrotizing vasculitis was confined only to t…

CD8+CD45RA+CD27-CD28-T-cell subset in PBL of cervical cancer patients representing CD8+T-cells being able to recognize cervical cancer associated ant…

2003

Objective In response to antigenic stimulation, naive MHC-class I restricted and antigen-specific CD8+CD45RA+CD28+T-cells undergo clonal expansion and differentiate into CD8+CD45RO+ memory T-cells. Upon re- encounter with the nominal antigen, CD45RO+ T-cells are able to convert to CD8+CD45RA+CD28-T-cells displaying potent immune effector functions, including TNF-alpha production. This T-cell subpopulation constitutes a minor population in healthy individuals. In the present study we are currently evaluating whether this particular T-cell subset in PBL represents CD8+T-cells which may be able to recognize cervical cancer associated antigens provided by HPV 16 E7. Material and methods Flow-cy…

Human papillomavirus (HPV) DNA in primary cervical cancer and in cancer free pelvic lymph nodes--correlation with clinico-pathological parameters and…

2001

OBJECTIVE To assess whether the presence of human papilloma virus (HPV) DNA and/or several genotypes of HPV DNA in primary cervical cancer and cancer free pelvic lymph nodes are correlated with several clinicopathological parameters of well-defined prognostic significance and whether virological parameters are predictors of long-term survival in cancer patients. PATIENTS AND METHODS 223 cases of cervical cancer patients included in this retrospective study underwent follow-up evaluation. Survival and cause of death were examined for 204 (91.4%) patients, with a mean follow-up time of 4.4 years. HPV DNA was detected using the high sensitive polymerase chain reaction (PCR) method followed by …

SPOC1, a novel PHD-finger protein: association with residual disease and survival in ovarian cancer.

2005

We report the identification of a novel human gene (SPOC1) which encodes a protein with a PHD-finger domain. The gene is located in chromosomal region 1p36.23, a region implicated in tumor development and progression. RNA in situ hybridization experiments showed strong SPOC1 expression in some rapidly proliferating cell types, such as spermatogonia, but not in nonproliferating mature spermatocytes. In addition, high SPOC1 mRNA expression was observed in several ovarian cancer cell lines. This prompted us to systematically examine SPOC1 expression in ovarian cancer in relation to prognosis. SPOC1 mRNA expression was quantified in tumor tissue of 103 patients with epithelial ovarian cancer. I…

Nuclear expression of apurinic/apyrimidinic endonuclease increases with progression of ovarian carcinomas.

2003

Apurinic/apyrimidinic endonuclease (APE alias Ref-1) is a key enzyme in the base excision repair pathway. Besides its function in DNA repair, APE serves to maintain several transcription factors in an active reduced state such as c-Fos, c-Jun, NF-kappaB, p53 and HIF-1alpha, all of which have been shown to play a role in tumorigenesis. Because of the importance of APE in maintaining genomic stability and gene regulation, we examined whether APE expression is associated with survival and histopathological parameters of patients with ovarian cancer.Tissue sections of primary epithelial ovarian carcinomas from 141 patients were immunostained using a monoclonal antibody directed against APE.Nucl…

Glutathione S-transferase T1 and M1 gene defects in ovarian carcinoma

1998

Glutathione S-transferases (GSTs) M1 and T1 are known to be polymorphic in humans. Both polymorphisms are due to gene deletions, which are responsible for the existence of null genotypes. The gene defect of GSTT1 has been reported to be associated with an increased risk of myelodysplastic syndromes, astrocytoma and meningioma. A lack of GSTM1 was associated with tobacco smoke-induced lung and bladder cancer. In this study we examined whether the GSTT1 and/or GSTM1 homozygous null genotypes were associated with an increased risk of ovarian cancer using a multiplex polymerase chain reaction protocol. The GSTT1 null genotype was observed in 14% of the control subjects that had never suffered f…

The presence of HPV DNA in cervical cancer: correlation with clinico-pathologic parameters and prognostic significance: 10 years experience at the De…

2001

The objective of this study was to assess whether the presence of human papillomavirus (HPV) DNA and/or several genotypes of HPV DNA in cervical cancer are correlated with several clinicopathologic parameters of well-defined prognostic significance and whether virologic parameters are predictors of long-term survival in cancer patients. Two hundred twenty three cases of cervical cancer patients included in this retrospective study underwent follow-up evaluation. Survival and cause of death were examined for 204 (91.4%) patients, with a mean follow-up time of 4.4 years. HPV DNA was detected using the highly sensitive polymerase chain reaction (PCR) method followed by HPV DNA sequencing for H…

Expression of tenascin in human cervical cancer--association of tenascin expression with clinicopathological parameters.

1999

Tenascin is an extracellular matrix glycoprotein, relevant for embryonal and fetal development, which is reexpressed in the stroma of benign and malignant tumors. Little is known about the molecular interaction of tenascin during neoplastic transformation and tumor progression in cervical cancer.We studied the expression of tenascin in normal tissue of the cervix uteri, cervical carcinoma in situ, and invasive cervical carcinoma in paraffin sections by immunohistochemistry using a monoclonal antibody. Tenascin immunoreactivity was compared with various prognostic parameters.In normal cervical tissue (n = 5) and in cervical carcinoma in situ (n = 10) only vessel walls showed a weak tenascin …

Activity of O(6)-methylguanine-DNA methyltransferase in relation to p53 status and therapeutic response in ovarian cancer.

1999

The DNA-repair protein O(6)-methylguanine-DNA methyltransferase (alkyltransferase; MGMT) is a major determinant of resistance of cells to various alkylating cytostatic drugs. Its expression in tissues is highly variable, indicating complex regulatory mechanisms involved. Transfection-mediated expression of wild-type p53 has been shown to negatively regulate basal promoter activity of MGMT in vitro. To elucidate whether p53 is involved in regulation of MGMT in tumor tissue, we examined MGMT expression and the p53 status of 140 primary ovarian carcinomas and analyzed the data as to the correlation between MGMT and p53, as well as the survival response of the patients after chemotherapy. We sh…

Induction of DNA crosslinks and DNA strand lesions by cyclophosphamide after activation by cytochrome P450 2B1

1997

Cyclophosphamide requires metabolic activation by cytochrome P450 to exert its genotoxic effects. Therefore in vitro studies on its mechanism of action have been limited to the use of self-activating derivatives of cyclophosphamide or to hepatocytes as an activating system. In this study we used a cell line of Chinese hamster lung fibroblasts (V79 cells), genetically engineered to express active cytochrome P450 2B1 as the sole observable cytochrome P450 (SD1 cells). An increase in DNA strand lesions (SL: DNA single-strand breaks and alkali labile sites) was observed between 0.5 and 1.5 mM cyclophosphamide (24 h incubation) which could be classified as alkali labile sites using a modified al…

Hepatocytes cultured in alginate microspheres: an optimized technique to study enzyme induction.

2004

An important application of hepatocyte cultures is identification of drugs acting as inducers of biotransformation enzymes that alter metabolic clearance of other therapeutic agents. In the present study we optimized an in vitro system with hepatocytes cultured in alginate microspheres that allow studies of enzyme induction with excellent sensitivity. Induction factors obtained with standard inducers, such as 3-methylcholanthrene or phenobarbital, were higher compared to those with conventional hepatocyte co-cultures on collagen coated dishes. This is illustrated by activities of 7-ethoxyresorufin-O-deethylase (EROD) after incubation with 5 microM 3-methylcholanthrene (3-MC), a standard ind…

Evaluation of DNA ploidy and degree of DNA abnormality in benign and malignant melanocytic lesions of the skin using video imaging.

2000

BACKGROUND Making a morphologic distinction between benign and malignant melanocytic tumors of the skin is frequently difficult, especially because “gray zones” between these lesions often exist. DNA image cytometry as an adjuvant method for the diagnosis and prognostic prediction of premalignant lesions and malignant tumors of many other organs is already well established. The aim of this study was to determine whether DNA image cytometry is helpful in distinguishing benign from malignant melanocytic lesions and whether cytometry would give valid information with which to predict the prognoses associated with malignant melanomas. METHODS DNA image cytometry was performed on 127 benign and …

4-Epidoxycycline: an alternative to doxycycline to control gene expression in conditional mouse models

2004

Since the pioneering work by Gossen and Bujard in 1992 demonstrating the usefulness of the Escherichia coli derived tet resistance operon for regulating gene expression a large collection of doxycycline-controlled transgenic mice has been established. Gene switching in eukaryotic tissue culture cells or mice requires administration of tetracycline, anhydrotetracycline or doxycycline to efficiently inactivate the transactivator protein tTA (TET-OFF system) or alternatively to activate the reverse transactivator protein rtTA (TET-ON system). However, the antibiotic activity of doxycycline can create an imbalance of the intestinal flora, resulting in diarrhoea and in a smaller number of animal…

Vascular endothelial growth factor gene polymorphisms in ovarian cancer

2007

Abstract Background. Polymorphisms within the vascular endothelial growth factor (VEGF) gene, the most important regulator of angiogenesis and vascular permeability, were shown to be independently associated with an impaired prognosis in various malignancies. No data have been reported in ovarian cancer. Methods. In the present multi-center study, we examined three common polymorphisms within the VEGF gene ( VEGF +405G/C, VEGF −460C/T, and VEGF +936C/T) in 553 Caucasian patients with ovarian cancer using pyrosequencing. Results. The three investigated polymorphisms did not correlate with any of the investigated clinico-pathological parameters. In univariate and multivariate models, only FIG…

Antigen-Driven T-Cell Selection in Patients with Cervical Cancer as Evidenced by T-Cell Receptor Analysis and Recognition of Autologous Tumor

2002

ABSTRACTWe characterized the T-cell receptor (TCR) repertoire in freshly harvested tumor lesions, in short-term-expanded CD4+tumor infiltrating lymphocytes (TIL) as well as in CD4+and CD8+peripheral blood lymphocytes (PBL) from three patients with cervical cancer. Skewing of the T-cell repertoire as defined by measuring the length of the complementarity-determining region 3 (CDR3) of the TCR VA and VB chains was observed in CD8+PBL, in freshly harvested tumor tissue, as well as in CD4+TIL. Comparative analysis of the TCR repertoire revealed unique monoclonal TCR transcripts within the tumor lesion which were not present in PBL, suggesting selection of TCR clonotypes due to antigenic stimula…

Metallothionein expression in ovarian cancer in relation to histopathological parameters and molecular markers of prognosis

2001

Metallothioneins (MTs) and glutathione constitute the major fractions of intracellular thiol factors. Abundant nucleophilic sulfhydryl groups can interact with many electrophilic substances, including several anti-neoplastic agents, participate in controlling intracellular redox potential, and act as scavengers of reactive oxygen species. In the present study, we examined the relation of MTs (alone and in combination with glutathione) to histopathological parameters and survival time of ovarian cancer patients. Expression of the major MT isoforms (MT-1 and MT-2) was determined by immunohistochemistry on paraffin-embedded tumor specimens from 189 patients, 151 suffering from primary epitheli…

Role of the progesterone receptor for paclitaxel resistance in primary breast cancer

2007

Paclitaxel plays an important role in the treatment of primary breast cancer. However, a substantial proportion of patients treated with paclitaxel does not appear to derive any benefit from this therapy. We performed a prospective study using tumour cells isolated from 50 primary breast carcinomas. Sensitivity of primary tumour cells to paclitaxel was determined in a clinically relevant range of concentrations (0.85-27.2 microg ml(-1) paclitaxel) using an ATP assay. Chemosensitivity data were used to study a possible association with immunohistochemically determined oestrogen and progesterone receptor (ER and PR) status, as well as histopathological parameters. Progesterone receptor (PR) m…

Induction of DNA single-strand breaks by 131I and 99mTc in human mononuclear blood cells in vitro and extrapolation to the in vivo situation.

2000

The radionuclides (131)I and (99m)Tc are frequently used for therapy of benign and malignant thyroid disease ((131)I) and for diagnosis of thyroid and other diseases ((99m)Tc). However, the levels of DNA single-strand breaks (SSBs) induced in cells of patients after administration of (131)I and (99m)Tc are not known. In this study, we measured the number of SSBs per cell induced by (131)I and (99m)Tc in vitro, extrapolated the results to the clinical situation, and assessed their biological relevance by comparing levels of SSBs induced after therapeutic administration of (131)I and (99m)Tc to those induced by endogenous processes or by occupational exposure to genotoxic substances. A linear…

Multivariate independent prognostic factors in endometrial carcinoma: A clinicopathologic study in 181 patients

2003

The aim of this study was to evaluate the biologic outcome of endometrial carcinomas as compared to clinical and pathologic parameters and to identify multivariate independent prognostic factors. Charts were abstracted from patients with endometrial carcinoma from 1985 to 1995. Data on clinicopathologic variables, adjuvant treatment, site of recurrence, and survival were collected. χ2 test was used to test association between variables. Kaplan-Maier method was used for survival analysis and Cox proportional hazards model for multiple regression analysis. Univariate analysis revealed that FIGO stage, tumor grade, depth of myometrial invasion, biochemical analysis of progesterone receptor sta…

Dephosphorylation of p-ERK1/2 in relation to tumor remission after HER-2 and Raf1 blocking therapy in a conditional mouse tumor model

2006

Several studies have shown that HER-2/neu (erbB-2) blocking therapy strategies can cause tumor remission. However, the responsible molecular mechanisms are not yet known. Both ERK1/2 and Akt/PKB are critical for HER-2-mediated signal transduction. Therefore, we used a mouse tumor model that allows downregulation of HER-2 in tumor tissue by administration of anhydrotetracycline (ATc). Switching-off HER-2 caused a rapid tumor remission by more than 95% within 7 d of ATc administration compared to the volume before switching-off HER-2. Interestingly, HER-2 downregulation caused a dephosphorylation of p-ERK1/2 by more than 80% already before tumor remission occurred. Levels of total ERK protein…

Resistance factors in colon cancer tissue and the adjacent normal colon tissue: glutathione S-transferases alpha and pi, glutathione and aldehyde deh…

1998

Abstract Glutathione S -transferases (GST) α and π , glutathione (GSH) and aldehyde dehydrogenase (ADH) were determined in colorectal cancer tissue specimens and in the adjacent normal colon tissue. The median contents in normal and cancer tissue were 8.1 (2.3–30.3) (5–95% quantiles) and 15.1 (5.3–50.3) μ g/mg protein for GST π ( P =0.035), 0.0 (0.0–1.4) and 0.4 (0.0–3.5) μ g/mg protein for GST α ( P =0.019), 7.3 (1.3–22.7) and 5.6 (2.3–26.0) μ g/mg protein for GSH ( P =0.171) and 30.8 (13.0–42.0) and 23.2 (9.0–32.9) μ g/mg protein for ADH ( P =0.0017), respectively. Thus, the mean GST α and π both significantly increased in colon cancer compared to the adjacent normal tissue, which underli…

Glutathione, GlutathioneS-Transferase α and π, and Aldehyde Dehydrogenase Content in Relationship to Drug Resistance in Ovarian Cancer

1997

Glutathione, glutathione S-transferases alpha and pi, and aldehyde dehydrogenase are associated with resistance to carboplatin and/or cyclophosphamide in cell lines. Therefore, we examined whether the expression of these factors in ovarian cancer tissue specimens is associated with resistance of the patients to combination chemotherapy with cyclophosphamide/carboplatin. Ovarian cancer tissue specimens were taken intraoperatively from 139 patients and frozen in liquid nitrogen, and the contents of glutathione S-transferases alpha and pi, total glutathione, and aldehyde dehydrogenase activity were determined. No association between the levels of glutathione S-transferases alpha and pi or alde…

Improved assessment of T-cell receptor (TCR) VB repertoire in clinical specimens: combination of TCR-CDR3 spectratyping with flow cytometry-based TCR…

2002

ABSTRACTAntigen-specific T-cell responses may be described by combining three categories: (i) the specificity and effector functions of a T-cell population, (ii) the quantity of T-cell responses (i.e., the number of responding T cells within the CD4/CD8 population), and (iii) the “quality” of T cells (defined by the T-cell receptor [TCR] structure). Several methods to measure T-cell responses are now available including evaluation of T-cell precursors using limiting dilution, the enzyme-linked immunospot assay, ex vivo TCR variable (v)-segment analysis determined by flow cytometry, and TCR-CDR3 length analysis (spectratyping), as well as identification of peptide-specific T cells using majo…

C-erbB-2-oncogene expression in breast carcinoma: Analysis by S1 nuclease protection assay and immunohistochemistry in relation to clinical parameters

1992

The c-erbB-2 mRNA was detected by the S1 nuclease protection assay and Northern blotting in breast cancer tissues. In contrast to the Northern blot analysis which has been used in all recent publications concerning c-erbB-2 expression on the level of RNA, the S1-nuclease protection assay has distinct advantages with respect to sensitivity, reproducibility, and handling of radioactive probes. We compared the expression of c-erbB-2 in 120 breast carcinomas which were operated in the years 1989-1990 on the level of the mRNA (S1 nuclease protection assay) and the protein (immunohistochemistry), respectively. In general, results obtained with both methods were in good agreement. Only minor diffe…

Multivariate independent prognostic factors in endometrial carcinoma: A clinicopathologic study in 181 patients: 10 years experience at the Departmen…

2003

The aim of this study was to evaluate the biologic outcome of endometrial carcinomas as compared to clinical and pathologic parameters and to identify multivariate independent prognostic factors. Charts were abstracted from patients with endometrial carcinoma from 1985 to 1995. Data on clinicopathologic variables, adjuvant treatment, site of recurrence, and survival were collected. chi2 test was used to test association between variables. Kaplan-Maier method was used for survival analysis and Cox proportional hazards model for multiple regression analysis. Univariate analysis revealed that FIGO stage, tumor grade, depth of myometrial invasion, biochemical analysis of progesterone receptor s…