G G Kenter

Leids Universitair Medisch Centrum, Leiden, South Holland, Netherlands

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Publications (70)176.26 Total impact

  • Article: Role of IL-12p40 in cervical carcinoma.
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    ABSTRACT: Background:Previously, we have shown that low IL-12p40 mRNA expression by cervical cancer cells is associated with a poor survival of cervical cancer patients. As IL-12p40 is both a subcomponent of interleukin (IL)-12 and IL-23, the aim of this study was to elucidate the role of IL-12p40 in cervical cancer.Methods:We have measured the expression of IL-23p19 mRNA, IL-12p35 mRNA and IL-12p40 mRNA using mRNA in situ hybridisation. The IL-1 and IL-6 were measured by immunohistochemistry.Results:As IL-23 is a component of the IL-17/IL-23 pathway, a pathway induced by IL-1 and IL-6 in humans, we have studied IL-1 and IL-6 expression. Only a high number of stromal IL-6-positive cells was shown to associate with poor disease-specific survival. The worst disease-specific survival was associated with a subgroup of patients that displayed a high number of IL-6-positive cells and low IL-12p40 expression (P<0.001). Both a high number of IL-6-positive cells and a high number of IL-6-positive cells, plus low IL-12p40 expression were shown to be clinicopathological parameters independent of lymph node metastasis, parametrial involvement and Sedlis score (P=0.009 and P=0.007, respectively).Conclusion:Our results with IL-6 and IL-12p40 are in accordance with the hypothesis that the IL-17/IL-23 pathway has a suppressive role in cervical cancer.British Journal of Cancer advance online publication, 25 October 2012; doi:10.1038/bjc.2012.488www.bjcancer.com.
    British Journal of Cancer 10/2012; · 5.04 Impact Factor
  • Article: The Swift operation: a modification of the Leiden nerve-sparing radical hysterectomy
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    ABSTRACT: In 2002, our group introduced an operation to avoid damage to the pelvic autonomous nerves during radical hysterectomy that proved to be feasible, effective and safe. During the last five years, we have adapted our surgical technique to make this procedure easier and safer in terms of radicality. We report on the changes in the surgical approach and the results in the first 15 consecutive patients. The Swift operation is more radical in the area of the uterosacral ligaments than the original operation, and it dissects the hypogastric nerve free under direct vision. In the area of the parametria, it is more radical in the deep lateral part. The vascular parametrial tissue is dissected and separated ventrally from the ureters. From October 2006 to February 2007, 15 consecutive patients with cervical cancer stage IA2 to IB2 underwent the Swift operation. The extra operating time amounted to 20 min, which was similar to the original operation, and with no extra blood loss. The suprapubic catheter was removed after a median of five days. Up until now (February 2008), no recurrences have been seen in these patients. It was concluded that the Swift procedure is easy to perform and that it offers advantages over the original operation in terms of safety and radicality.
    Gynecological Surgery 04/2012; 5(3):193-198.
  • Article: Survival of Patients with Ovarian Cancer due to a Mismatch Repair Defect
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    ABSTRACT: Purpose: Hereditary non-polyposis colorectal cancer (HNPCC, Lynch syndrome) is characterized by the development of cancer of the colorectum, endometrium and other cancers. Cancer of the ovaries (OC) has frequently been reported in HNPCC. Colorectal cancer associated with HNPCC has a better survival chance compared to sporadic colorectal cancer. It is yet unknown whether patients with OC from HNPCC families (OC–HNPCC) also have a better survival. Therefore, the aim of the study was to compare the survival between patients with OC–HNPCC and a control group. Methods: A total of 26 patients with OC were identified from the Dutch HNPCC Registry. A control group (52 cases) matched for age, stage and year of diagnosis was derived from the population-based Eindhoven Cancer Registry. Data on treatment were collected for all patients. Kaplan–Meier analysis was used to calculate the crude survival. Results: The mean age at diagnosis of OC–HNPCC was significantly lower than the age of sporadic OC (49.5 vs 60.9 years). Compared to sporadic OC, OC–HNPCC was diagnosed at an earlier stage. The survival rate was not significantly different between patients with OC–HNPCC and the controls with sporadic OC. The cumulative 5-year-survival rates were 64.2 and 58.1% respectively. Conclusion On the basis of our findings, we recommend to treat OC–HNPCC similar to sporadic OC.
    Familial Cancer 04/2012; 4(4):301-305. · 1.30 Impact Factor
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    Article: Expression of endoglin (CD105) in cervical cancer.
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    ABSTRACT: In this study, we have investigated the role of endoglin (CD105), a regulator of transforming growth factor (TGF)-beta(1) signalling on endothelial cells, basic fibroblast growth factor (bFGF) and vascular endothelial growth factor-A (VEGF-A) in cervical cancer. We have measured the number and determined the location of both newly formed (CD105-positive) and the overall number of (CD31-positive) blood vessels, and bFGF and VEGF-A expression using immunohistochemistry in 30 cervical carcinoma specimens. Vascular endothelial growth factor-A mRNA expression was determined using RNA-in situ hybridisation. CD105- and CD31-positive vessels and bFGF- and VEGF-A-positive cells were predominantly present in the stroma. The presence of CD105- and CD31-positive vessels in the stroma did neither correlate with the number of VEGF-A-positive cells nor the number of bFGF-positive cells. However, the number of CD105- and CD31-positive vessels was associated with the expression of VEGF-A mRNA in the epithelial cell clusters (P=0.013 and P=0.005, respectively). The presence of CD105-positive and CD31-positive vessels was associated with the expression of alphavbeta6 (a TGF-beta(1) activator; P=0.013 and P=0.006, respectively). Clinically, the number of CD105-positive vessels associated with the number of lymph node metastasis (P<0.001). Furthermore, the presence of CD105-positive vessels within the epithelial cell clusters associated with poor disease-free survival (P=0.007).
    British Journal of Cancer 04/2009; 100(10):1617-26. · 5.04 Impact Factor
  • Article: The Gynaecologic Leiden Questionnaire: psychometric properties of a self-report questionnaire of sexual function and vaginal changes for gynaecological cancer patients.
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    ABSTRACT: The aim of this study was to investigate the psychometric properties of the items concerning sexual functioning of the Gynaecologic Leiden Questionnaire (LQ), which consists of items for post operative morbidity for women with cancer. The total study sample consisted of 198 subjects: 66 patients treated for cervical cancer, 66 patients with sexual complaints and 66 subjects from the general population. By means of factor analysis three subscales were derived: Female Sexual Complaints, Female Sexual Function and Female Orgasm. The reliability of the subscales appeared to be satisfactory. The scores on the three subscales differentiated well between the patients treated for cervical cancer, patients with sexual complaints and the subjects from the general population. Furthermore, the subscales were sensitive to changes within the patients treated for cervical cancer. The convergent and divergent construct validities of the LQ were investigated using other instruments measuring sexual functioning, sexual dissatisfaction, marital distress, general life distress and psychological distress. The LQ subscales were found to represent relatively independent constructs. The results support the reliability and psychometric validity of the LQ in the assessment of sexual functioning and vaginal changes in gynaecological cancer patients.
    Psycho-Oncology 08/2008; 17(7):681-9. · 3.34 Impact Factor
  • Article: Overexpression of the alpha v beta 6 integrin in cervical squamous cell carcinoma is a prognostic factor for decreased survival.
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    ABSTRACT: Cervical squamous cell carcinomas are composed histologically of tumour cell islands surrounded by varying amounts of tumour stroma, the amount and composition of which are influenced by local TGF-beta(1). TGF-beta(1) is secreted in an inactive complex with latency-associated peptide (LAP). Both LAP and the extracellular matrix (ECM) protein fibronectin are important ligands for the integrin receptor alpha v beta 6. While alpha v beta 6 is only weakly expressed by normal epithelia, it is up-regulated in different carcinomas where it generally reflects a more aggressive phenotype. In cervical cancer, the expression of alpha v beta 6 has not thus far been investigated. Given the ability of alpha v beta 6 both to activate TGF-beta(1) and to interact with fibronectin, we studied correlations between the expression of these components and disease parameters in a large cohort of cervical cancer specimens. We analysed alpha v beta 6 expression using immunohistochemistry in primary cervical squamous carcinomas of FIGO stage IA to IIB patients and correlated the findings with formerly investigated fibronectin and TGF-beta(1) expression and clinico-pathological parameters. alpha v beta 6 expression was also examined in cervical intra-epithelial neoplasia (CIN) and lymph node metastases. alpha v beta 6 was only weakly expressed in normal epithelium but clearly up-regulated in CIN lesions. In carcinomas, strong expression of alpha v beta 6 in tumour cells correlated with different clinico-pathological parameters and with worse overall and disease-free survival. Furthermore, alpha v beta 6 expression correlated positively with TGF-beta(1) mRNA expression as well as with fibronectin expression. Overexpression of alpha v beta 6 in cervical squamous carcinomas is an unfavourable prognostic factor. This might reflect an increased capacity of alpha v beta 6-expressing tumour cells to migrate in a fibronectin-rich ECM and/or to activate TGF-beta(1) at the tumour/stroma interface, both of which processes may contribute to cervical cancer progression.
    The Journal of Pathology 08/2007; 212(3):316-24. · 6.32 Impact Factor
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    Article: The number of pelvic lymph nodes in the quality control and prognosis of radical hysterectomy for the treatment of cervical cancer.
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    ABSTRACT: To determine if the number of removed lymph nodes in radical hysterectomy with lymphadenectomy (RHL) influences survival of patients with early stage cervical cancer and to analyze the relation of different factors like patient age, tumour size and infiltration depth with the number of nodes examined in node-negative early stage cervical cancer patients. Of consecutive patients, who underwent RHL between January 1984 and April 2005, 331 had negative nodes (group A) without adjuvant therapy and 136 had positive nodes (group B). The Kaplan-Meier method and Cox regression model were used to detect statistical significance. Factors associated with excision of nodes were confirmed with linear regression models. The median number of removed nodes was 19 and 18 for group A and group B, respectively. There was no significant relationship between the number of removed nodes and the cancer specific survival (CSS) or disease free survival (DSF) for patients of group A (p=0.625 and p=0.877, respectively). The number of removed nodes in group B was not significantly associated with the CSS (p=0.084) but it was for the DSF (p=0.014). Factors like patient age, tumour size and infiltration depth were not associated with the number of nodes. No relation was found between the number of negative nodes examined after RHL for the treatment of early stage cervical cancer and CSS or DFS. However, a higher amount of removed lymph nodes leaded to a better DFS for patients with positive nodes. It is suggested that patients with positive nodes benefit from a complete pelvic lymphadenectomy and a sufficient yield of removed nodes.
    European Journal of Surgical Oncology 04/2007; 33(2):216-21. · 2.50 Impact Factor
  • Article: Alterations in the p53 pathway and prognosis in advanced ovarian cancer: a multi-factorial analysis of the EORTC Gynaecological Cancer group (study 55865).
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    ABSTRACT: The study was designed to determine independent prognostic variables in suboptimally debulked advanced ovarian cancer patients entered in the randomised phase III study EORTC 55865. Retrospectively collected paraffin blocks from 169 patients with stages IIb-IV epithelial ovarian cancer, taken at primary debulking surgery, were analysed. All patients were treated with cyclophosphamide and cisplatin (CP), and followed up for a median of 10 years. Expression of p53, bcl-2, P21, Ki-67 and HER-2 status was assessed by immunohistochemistry (IHC). Expression of p21, a downstream effector of the p53 gene, was found to be a favourable prognostic factor for survival (HR 0.58, CI 0.36-0.94, p=0.025) in addition to FIGO stage (HR 1.54, CI 1.08-2.21, p=or<0.02). For progression free survival (PFS), both p21 (HR 0.52) and Ki-67 (HR 0.6) were significant factors. P21 overexpression is a positive prognostic factor for survival and PFS in advanced ovarian carcinoma with residual lesions of more than 1 cm.
    European Journal of Cancer 10/2006; 42(15):2539-48. · 5.54 Impact Factor
  • Article: Postoperative radiation therapy improves prognosis in patients with adverse risk factors in localized, early‐stage cervical cancer: a retrospective comparative study
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    ABSTRACT: The objective of this study was to assess the role of postoperative radiotherapy (RT) in early-stage cervical carcinoma with risk factors other than positive nodes, parametrial invasion, or positive margins and to compare outcomes using the Leiden University Medical Center (LUMC) modification of the Gynecologic Oncology Group (GOG) system with the GOG prognostic scoring system itself. Between January 1984 and April 2005, 402 patients with early-stage cervical cancer underwent radical hysterectomy. A total of 51 patients (13%) had two of the three risk factors and had pathologic tumor size (≥40 mm), invasion (≥15 mm), and capillary lymphatic space involvement, and were identified as the so-called high-risk (HR). We compared 34 patients who received RT based on the LUMC risk profile (67%) with 17 who did not (33%). The GOG score was calculated as well. We compared the GOG scores within the LUMC risk groups: HR+ (two out of three risk factors) and HR− (less than two out of three risk factors). Differences in 5-year cancer-specific survival (CSS) and 5-year disease-free survival (DFS) between the HR group treated with RT (86%, 85%) and without RT (57%; 43%) were statistically significant. The LUMC criteria did not significantly differ from the GOG risk profile, concerning recurrence, CSS, and DFS. HR patients benefit from adjuvant RT. The LUMC modification of the GOG system seems to be simpler and has a slightly higher threshold for the indication for RT but without a difference in outcome.
    International Journal of Gynecological Cancer 04/2006; 16(3):1112 - 1118. · 1.65 Impact Factor
  • Article: An observational longitudinal study to evaluate miction, defecation, and sexual function after radical hysterectomy with pelvic lymphadenectomy for early‐stage cervical cancer
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    ABSTRACT: The objective of this study was to evaluate the problems with miction, defecation, and sexuality after a radical hysterectomy with or without adjuvant radiotherapy for the treatment of cervical cancer stage I–IIA. This study included an observational longitudinal study of self-reported bladder, defecation, and sexual problems with a baseline score. Ninety-four women were included in the study. An age-matched control group consisted of 224 women. The patients showed significantly more negative effects on sexual function compared with both the controls and their situation before the treatment throughout 24 months of follow-up. The problems included less lubrication, a narrow and short vagina, senseless areas around the labia, dyspareunia, and sexual dissatisfaction. Up to 12 months after the treatment, the patients complained significantly more of little or no urge to urinate and diarrhea as compared with the controls. Adjuvant radiotherapy did not increase the risk of bladder dysfunction, colorectal motility disorders, and sexual functions. We conclude that a radical hysterectomy for the treatment of early-stage cervical carcinoma is associated with adverse effects mainly on sexual functioning.
    International Journal of Gynecological Cancer 04/2006; 16(3):1119 - 1129. · 1.65 Impact Factor
  • Article: The absence of CCL2 expression in cervical carcinoma is associated with increased survival and loss of heterozygosity at 17q11.2.
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    ABSTRACT: To determine whether CCL2 mRNA expression is beneficial or detrimental for cervical cancer patients, the association between the expression of this molecule by cervical tumour cells, the number of tumour-associated macrophages, and clinicopathological parameters such as recurrence, relapse-free survival, and overall patient survival was investigated. In cervical cancer samples from 93 untreated cervical cancer patients, the CCL2 mRNA expression level was quantified using RNA in situ hybridization and verified using real-time quantitative RT-PCR. The number of tumour-associated macrophages was determined using immunohistochemistry. Furthermore, the study investigated whether lack of CCL2 expression was due to genetic alterations near the 17q11.2 (CCL2 genomic) region. CCL2 mRNA expression by cervical tumour cells was associated with the number of tumour-associated macrophages (p < 0.001). Lack of CCL2 mRNA expression (15 samples; 16%) was associated with increased cumulative relapse-free survival (log rank test, p = 0.030), increased cumulative overall survival (log rank test, p = 0.024), less post-operative surgery, reduced local and distant recurrence, reduced vascular invasion, and smaller tumour size (<40 mm). The absence of CCL2 mRNA expression corresponded with loss of heterozygosity (LOH) at 17q11.2 in five of six samples. The increased cumulative relapse-free survival and cumulative overall survival of cervical cancer patients lacking tumour cell-associated CCL2 mRNA suggest that the tumour-associated macrophages support tumour progression, presumably by promoting angiogenesis and production of growth factors.
    The Journal of Pathology 03/2006; 208(4):507-17. · 6.32 Impact Factor
  • Article: Efficacy of screening women at high risk of hereditary ovarian cancer: results of an 11‐year cohort study
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    ABSTRACT: Gaarenstroom KN, van der Hiel B, Tollenaar RAEM, Vink GR, Jansen FW, van Asperen CJ, Kenter GG. Efficacy of screening women at high risk of hereditary ovarian cancer: results of an 11-year cohort study. Int J Gynecol Cancer 2006;16(Suppl. 1):54–59.The outcome of screening and prophylactic surgery in 269 women at high risk of hereditary ovarian cancer is reported. Screening was performed using transvaginal ultrasound and serum CA125 testing. Mean follow-up was 26 months (583 person-years). A total of 113 (42%) of 269 women had a pathogenic BRCA1 or BRCA2 mutation, and 127 (47%) of 269 women underwent salpingo-oophorectomy. No occult cancers were found. In eight women having both elevated CA125 levels and abnormal ultrasound findings, a malignancy was found. Four of these cancers (one borderline, one stage Ia, one stage IIIb, and one stage IIIc ovarian or peritoneal cancer) were detected at the first screening visit. One stage IIIb and one stage IIIc cancer were detected at the second screening visit after 12 months, and two interval stage IIIc and IV cancers were detected 8 and 10 months after the first screening visit. No peritoneal carcinoma was found among those 114 women who underwent bilateral salpingo-oophorectomy with normal or benign pathology results, after a mean follow-up of 16 months (152 person-years). We conclude that the efficacy of screening women at high risk of ovarian cancer seems poor because the majority of cancers were detected at an advanced stage.
    International Journal of Gynecological Cancer 01/2006; 16(S1):54 - 59. · 1.65 Impact Factor
  • Article: Survival of patients with ovarian cancer due to a mismatch repair defect.
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    ABSTRACT: Hereditary non-polyposis colorectal cancer (HNPCC, Lynch syndrome) is characterized by the development of cancer of the colorectum, endometrium and other cancers. Cancer of the ovaries (OC) has frequently been reported in HNPCC. Colorectal cancer associated with HNPCC has a better survival chance compared to sporadic colorectal cancer. It is yet unknown whether patients with OC from HNPCC families (OC-HNPCC) also have a better survival. Therefore, the aim of the study was to compare the survival between patients with OC-HNPCC and a control group. A total of 26 patients with OC were identified from the Dutch HNPCC Registry. A control group (52 cases) matched for age, stage and year of diagnosis was derived from the population-based Eindhoven Cancer Registry. Data on treatment were collected for all patients. Kaplan-Meier analysis was used to calculate the crude survival. The mean age at diagnosis of OC-HNPCC was significantly lower than the age of sporadic OC (49.5 vs 60.9 years). Compared to sporadic OC, OC-HNPCC was diagnosed at an earlier stage. The survival rate was not significantly different between patients with OC-HNPCC and the controls with sporadic OC. The cumulative 5-year-survival rates were 64.2 and 58.1% respectively. On the basis of our findings, we recommend to treat OC-HNPCC similar to sporadic OC.
    Familial Cancer 02/2005; 4(4):301-5. · 1.30 Impact Factor
  • Article: Prognostic difference of surgical treatment of exophytic versus barrel-shaped bulky cervical cancer.
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    ABSTRACT: The aim of the study was to evaluate the prognostic significance of tumor geography, defined as exophytic or barrel-shaped growth, in bulky (>4 cm) cervical cancer. Four hundred women with cervical cancer, treated by primary radical hysterectomy between January 1984 and November 2000, were followed in a prospective cohort study. Clinical and pathology data were stored in a databank and the clinical protocol was unchanged during the study except for the amendment of additional indications of postoperative radiation in 1997. The assessment of tumor geography was based on pelvic examination at the time of tumor staging or radical hysterectomy or from the pathology report. Survival probabilities were calculated by the Kaplan-Meier method and compared with the log-rank test. The mean age of the patients was 45 years and the mean follow-up duration 48 months. Tumors were of squamous cell type in 291 patients (73%). Lymph node metastases were present in 91 patients (24%) and postoperative radiation was given in 179 patients (45%). In 291 patients, tumor diameter was <4 cm; in 58 patients, the tumor was defined as bulky exophytic and in 51 patients as bulky barrel shaped. There were no differences among these three groups in terms of operating time, blood loss during surgery or complications at 3 or 6 months postoperatively. Bulky exophytic tumors had an identical overall survival as compared to small-diameter (<4 cm) tumors. The overall survival (OS) of bulky barrel-shaped tumors was significantly worse (P < 10(-4)). The same was found for disease-free survival (DFS). Bulky exophytic cervical cancer has an identical surgical morbidity, overall and disease-free survival as compared to nonbulky (<4 cm) cervical cancer. In view of these identical characteristics, primary surgical treatment should be considered for patients with bulky exophytic cervical cancer.
    Gynecologic Oncology 11/2004; 95(1):77-81. · 3.89 Impact Factor
  • Article: Objective assessment of sexual arousal in women with a history of hysterectomy.
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    ABSTRACT: The potential contribution of psychological and anatomical changes to sexual dysfunction following hysterectomy is not clear. Radical hysterectomy for cervical cancer causes surgical damage to the autonomic nerves which are responsible for the increased vaginal blood flow during sexual arousal. Simple hysterectomy causes more limited nerve disruption. Photoplethysmographic assessment of vaginal pulse amplitude objectively measures vaginal blood flow during sexual arousal. We hypothesised that damage of the autonomic nerves results in a disrupted vaginal blood flow response during sexual stimulation. Between-groups comparison of vaginal pulse amplitude. University hospital. Twelve women with a history of radical hysterectomy, 12 women with a history of simple abdomonal hysterectomy and 17 aged-matched controls. Photoplethysmographic assessment of vaginal pulse amplitude during sexual stimulation by erotic films. Self-reported ratings of subjective sexual arousal were collected after each erotic stimulus condition. Maximum vaginal pulse amplitude. Maximum vaginal pulse amplitude differed between the three groups (P= 0.043). Women with a history of radical hysterectomy had a lower response than controls (P= 0.015). Women in the radical hysterectomy group and controls reported an equally strong subjective arousal. Women with a history of simple hysterectomy showed an intermediate maximum vaginal pulse amplitude. Radical hysterectomy seems associated with a disturbed vaginal blood flow response during sexual arousal. This cannot be explained solely by uteric extirpation, since it was not observed to the same extent after simple hysterectomy, but might be related to a denervation of the vagina which increases with increasing radicality of surgery.
    BJOG An International Journal of Obstetrics & Gynaecology 06/2004; 111(5):456-62. · 3.41 Impact Factor
  • Article: Nerve sparing radical hysterectomy: latest developments and historical perspective.
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    ABSTRACT: Autonomic nerve damage during surgery is thought to play a crucial role in the aetiology of bladder dysfunction, sexual dysfunction and colorectal motility disorders which are seen in patients after radical hysterectomy. In order to prevent these complications, Japanese gynaecologists introduced a surgical technique with preservation of the pelvic autonomic nerves in the 1960s. In the 1980s the first English paper was published. Since then several surgical approaches have been described, i.e. liposuction, electrical stimulation to locate nerves intra-operatively and laparoscopically assisted techniques. Recently, more attention is being paid to the importance of sparing the sympathetic hypogastric nerve. All authors report results on small cohorts of patients. The incidence of urinary dysfunction seems very low after nerve sparing. Sparing the autonomic nerves during radical hysterectomy seems feasible and safe in both Japanese and Western patients. Literature review does not provide strong clues for a compromised radicality and cure due to nerve sparing. Future larger clinical trials will have to decide whether the technique of nerve sparing radical hysterectomy could be implemented as a standard treatment for cervical cancer patients.
    Critical Reviews in Oncology/Hematology 01/2004; 48(3):271-9. · 4.41 Impact Factor
  • Article: [Nerve sparing radical hysterectomy in the case of cervical cancer].
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    ABSTRACT: Autonomous pelvic nerves are essential for bladder and rectum function as well as sexuality. These nerves are usually permanent damaged during radical oncological surgery and this results in urological, sexual and proctological morbidity. Japanese surgeons have paved the way for surgical approaches to dissect these nerves during surgery and leave them intact. At the Department of Gynaecology of the Leiden University Medical Center, the Netherlands, a new surgical technique has been developed to spare the autonomous pelvic nerves during radical hysterectomy. In this procedure the lateral parts of the sacro-uterine ligament, through which the N. hypogastricus passes bilaterally, are left intact. The initial results of this nerve-sparing surgical technique during radical hysterectomy seem to be promising. The operation was easy to perform, with almost no extra blood loss and an extra operating time of just 10-15 minutes. Postoperative recovery of the bladder function occurred after a mean period of 9 days.
    Nederlands tijdschrift voor geneeskunde 08/2003; 147(28):1344-7.
  • Article: [Recommendations for the management of women with an increased genetic risk of gynaecological cancer].
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    ABSTRACT: About 5% of all ovarian-cancer cases are caused by a genetic predisposition, in particular as a component of the autosomal dominant hereditary breast-ovarian-cancer syndrome. This syndrome is usually due to germline mutations in the BRCA1- or BRCA2-gene. Ovarian and endometrial cancer also occur in families with hereditary non-polyposis colorectal cancer (HNPCC). This syndrome is caused by germline mutations in DNA mismatch-repair genes. Women at high risk of gynaecological cancer based upon familial clustering of disease or a demonstrated pathogenic germ-line mutation are candidates for surveillance: annual gynaecological examinations, including vaginal echoscopy and serum carcinoma antigen CA125 testing. Prophylactic surgery in the form of adnexectomy leads to a marked, but not complete, reduction of ovarian-cancer risk in high-risk cases. There is insufficient evidence to advise against the use of oral contraceptives or hormonal substitution after adnexectomy for healthy women with a genetic predisposition to breast cancer. Recommendations for surveillance and prevention should only be given after genetic-risk counselling, based on a detailed family study and DNA-based diagnosis.
    Nederlands tijdschrift voor geneeskunde 01/2003; 146(50):2414-8.
  • Article: [The Dutch College of General Practitioners' practice guideline, "Vaginal bleeding"; reaction from a gynaecological perspective].
    G G Kenter
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    ABSTRACT: The Dutch College of General Practitioners' practice guideline 'Vaginal bleeding' is a useful instrument for general practitioners. The changes in the present version are based on recent developments in diagnostic and therapeutic possibilities, such as (hydro-)ultrasonography to diagnose intracavitary abnormalities, progesterone-containing 'intra-uterine devices' (IUDs) and endoscopic techniques for destroying the endometrium. The recommendation to prescribe cyclical progestogens in the case of hypermenorrhoea is not supported by randomised studies. On balance, this guideline provides clear and useful advice for the treatment of abnormal vaginal blood loss.
    Nederlands tijdschrift voor geneeskunde 12/2002; 146(46):2177-9.
  • Article: Tumor diameter and volume assessed by magnetic resonance imaging in the prediction of outcome for invasive cervical cancer.
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    ABSTRACT: The aim of this study was to evaluate the predictive value of pretherapeutic magnetic resonance imaging (MRI)-based measurements of tumor diameter and volume with regard to recurrent disease. MRI on 0.5- or 1.5-T scanners was performed in 126 consecutive women with invasive carcinoma of the uterine cervix. Initial tumor diameter and volume were determined on T(2)-weighted images; volume was calculated by the standard technique of multiplying the sum of the areas by the slice thickness. Patients were treated by radical surgery, radiotherapy, or a combined approach based on clinical International Federation of Gynecology and Obstetrics (FIGO) stage and individual patient criteria. Clinical data (patient age and FIGO stage), MRI-derived tumor dimensions (diameter and volume), and histological findings (tumor invasion depth and lymph-node involvement) were associated and linked to patient outcome. MRI-based tumor diameter correlated strongly with histological tumor invasion depth and lymph-node status (P < 0.01 and P = 0.01) while tumor volume on MRI was significantly associated only with tumor invasion depth into adjacent tissues (P < 0.01). Univariate analysis demonstrated graphically that MRI-derived tumor diameter and volume and clinical FIGO stage are associated with progression-free survival. Correlation analysis showed a strong association between MRI-derived tumor diameter and volume on MRI (r = 68%, P < 0.01) and also demonstrated a correlation between tumor diameter on MRI and FIGO stage Ib (Ib1 versus Ib2) cervical tumors (r = 46.7%, P < 0.01). Tumor diameter and volume, determined by pretreatment MRI examinations, predict progression-free survival for patients with invasive cervical carcinoma. This study demonstrates the value of MRI as an adjunct to clinical evaluation of invasive cervical cancer, providing more complete assessment of morphological risk factors important in patient prognosis and treatment planning.
    Gynecologic Oncology 10/2001; 82(3):474-82. · 3.89 Impact Factor

Institutions

  • 1996–2012
    • Leids Universitair Medisch Centrum
      • • Department of Gynaecology
      • • Department of Pathology
      Leiden, South Holland, Netherlands
  • 1990–2012
    • Universiteit Leiden
      Leiden, South Holland, Netherlands
  • 1988–2012
    • Netherlands Cancer Institute
      • Department of Gynecology
      Amsterdam, North Holland, Netherlands
  • 2006
    • Universitair Medisch Centrum Utrecht
      • Department of Gynecology
      Utrecht, Provincie Utrecht, Netherlands
  • 2003
    • VU medisch centrum
      Amsterdam, North Holland, Netherlands