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L A Kiemeney

Publications and source records attributed to L A Kiemeney.

At least 19 recordsLinked to original sources

Numerous high-risk epithelial lesions in familial breast cancer.

PURPOSE: To assess the occurrence of high-risk epithelial lesions in women of breast cancer families with and without a BRCA mutation. PATIENTS AND METHODS: Prospective study of women at very high risk of breast cancer undergoing prophylactic mastectomy (68 BRCA1 mutation carriers, 14 BRCA2 mutation carriers and 24 non-BRCA mutation carriers). RESULTS: The prevalence of high-risk lesions is equal in women with a BRCA1 or a BRCA2 mutation, but is higher in non-BRCA mutation carriers: all lesions 43% versus 71% (p=0.02), atypical lobular hyperplasia 26% versus 67% (p=0.001), atypical ductal hyperplasia 17% versus 42% (p=0.01), lobular carcinoma-in situ 15% versus 29% (p=0.10) and ductal carcinoma-in situ 9% versus 17% (p=0.25). The presence of high-risk lesions is related to absence of a BRCA mutation and to age over 40 years. CONCLUSION: Women with an autosomal dominant family history for breast cancer, with and without a BRCA mutation are prone to develop high-risk epithelial lesions, especially over 40 years.

Adult↗

Cardiovascular risk among men seeking help for erectile dysfunction.

PURPOSE: The introduction of sildenafil put the risk of cardiovascular disease (CVD) among men with erectile dysfunction (ED) on the agenda of physicians. The question arose, Is EDsentinel to CVD? We sought to answer this question in the present study. METHODS: A historical cohort study was set up using medical records of general practices all over the Netherlands. Incident cases of ED were selected before and after the introduction of sildenafil using a catchment population of 60,000 men aged 35 to 74 years. Two to three men without ED (controls) were, subsequently, matched to each case. Incidence of CVD was determined for cases and controls, respectively. RESULTS: Overall, incidence of ED doubled from 5.3 per 1000 men-years in the period before introduction of sildenafil to 10.1 after the introduction. The relative risk of incident CVD among men with ED compared to controls was 1.7 [95%-CI 0.9-3.3] before the introduction and 1.1 [95%-CI 0.6-1.8] afterwards. CONCLUSIONS: While ED could be seen as a marker for CVD before the introduction of sildenafil, it was clearly not afterwards.

Adult↗

[The risk of cancer in inhabitants of Weurt, the Netherlands].

OBJECTIVE: To analyze the risk of cancer in the population of Weurt, a village near Nijmegen, the Netherlands, using long-term data (13 years). DESIGN: Cluster analysis. METHOD: Anonymous data on newly diagnosed cases of cancer in the years 1989-2001 were obtained from the regional cancer registry. The region had about 1 million inhabitants and 263 postal code areas. The Dutch Central Statistical Office (Statistics Netherlands) provided age- and sex-specific population data for each postal code area. Ratios of observed and expected numbers of cancer cases were calculated (uncorrected standardized mortality ratio; SMR). A Bayesian analysis with a random effects model with spatial correlation was used to adjust the SMRs for cancer incidence in neighbouring postal code areas. RESULTS: In the years 1989-2001, a total number of 167 cases of cancer (97 in males and 70 in females) were diagnosed in Weurt. The number of cancers in the entire area was 58,126. In Weurt the adjusted SMR for all cancers was 1.18 (95% CI: 0.95-1.44) in males and 1.10 (95% CI: 0.86-1.39) in females. For lung cancer the adjusted SMR was 1.35 (95% CI: 0.88-1.94) in males and 1.00 (95% CI: 0.29-2.13) in females. None of the other types of cancer showed a statistically significant increase in incidence in Weurt. CONCLUSIONS: Although based on relatively small numbers of diagnosed cancers, these results are not suggestive of a real cancer cluster in Weurt. Lung cancer incidence was slightly increased in males and not in females, which may indicate that chance, lifestyle or occupational factors were more obvious causes than environmental factors. In general, it is advised to be reluctant to perform cluster analyses. Such analyses may only be valuable if specific hypotheses regarding causes of specific types of cancer are present.

Adult↗

Preliminary European results of local microwave hyperthermia and chemotherapy treatment in intermediate or high risk superficial transitional cell carcinoma of the bladder.

INTRODUCTION: Superficial bladder cancer can be treated by transurethral resection (TUR) and adjuvant intravesical therapy. Intravesical bacillus Calmette-Guérin (BCG) has been proven to be more efficacious with respect to recurrence prevention than intravesical chemotherapy, although at the cost of more severe side effects. There is a need for a new treatment modality with higher efficacy and less toxicity. The subject of this study is the efficacy of local microwave hyperthermia and chemotherapy treatment in intermediate or high risk superficial transitional cell carcinoma (TCC) of the bladder. PATIENTS AND METHODS: Ninety eligible patients received adjuvant treatment with a combination of mitomycin-C (MMC) and local microwave hyperthermia. All patients had multiple or recurrent Ta or T1 TCC of the bladder and were classified as intermediate or high risk according to EAU criteria. In total, 41 patients were BCG failures. The treatment regimen included 6 to 8 weekly sessions followed by 4 to 6 monthly sessions. Follow-up consisted of video-cystoscopy and urine cytology every 3 months. All patients were observed for 2 years. RESULTS: Kaplan-Meier analyses of the total group (N = 90) indicated that 1 year after treatment only 14.3% (SE 4.5%) of all patients experienced a recurrence. After 2 years of follow-up the risk of recurrence was 24.6% (SE 5.9%). No progression in stage and grade was observed. CONCLUSION: Microwave induced hyperthermia combined with MMC has promising value in intermediate or high risk superficial bladder cancer patients compared to literature data of BCG and/or intravesical chemotherapy, particularly where other treatments, i.e. BCG, have failed.

Adult↗

High prevalence of premalignant lesions in prophylactically removed breasts from women at hereditary risk for breast cancer.

PURPOSE: Women with a hereditary predisposition for breast cancer have an extremely high risk of developing invasive breast carcinoma, and many women consider prophylactic mastectomy to avoid this risk. The use of prophylactic mastectomy is still debated. Identification of frequent premalignant lesions in mastectomy specimens would support the preventive concept of prophylactic mastectomy. PATIENTS AND METHODS: We performed a prospective study of breast specimens from 67 women at extremely high genetic risk of breast cancer, with or without previous breast cancer, who were undergoing prophylactic mastectomy (66% were carriers of a BRCA1 or BRCA2 mutation). Breast specimens were studied by radiographic and macroscopic examination of 5-mm tissue slices, with subsequent histology of suspicious lesions and random samples from each quadrant of the breast and the nipple area. RESULTS: In 57% of the women, one or more different types of high-risk histopathologic lesions were present: 37% atypical lobular hyperplasia, 39% atypical ductal hyperplasia, 25% lobular carcinoma-in-situ, and 15% ductal carcinoma-in-situ. A 4-mm invasive ductal carcinoma was found in one woman with ductal carcinoma-in-situ. None of these lesions was detected at palpation or mammography, which were performed before the mastectomy. The presence of high-risk lesions was independently related to age older than 40 years (odds ratio, 6.6; P =.01) and to bilateral oophorectomy before prophylactic mastectomy (odds ratio, 0.2; P = 0.02). CONCLUSION: Many women at high risk of hereditary breast cancer develop high-risk histopathologic lesions, especially after the age of 40 years. Surveillance does not detect such high-risk histopathologic lesions.

Adult↗

Very low incidence of microsatellite instability in rectal cancers from families at risk for HNPCC.

In families at risk for hereditary non-polyposis colorectal cancer (HNPCC) that do not fulfill all clinical criteria for HNPCC, additional evidence is sought by testing cancer specimens for microsatellite instability (MSI). We investigated whether the location of a colorectal cancer (CRC) predicts the result of MSI-testing in these families. One hundred and seven patients suspected for HNPCC were offered MSI-testing. MSI-testing was positive in 6/7 patients with endometrial carcinoma and in 22/100 patients with CRC. Only one out of 22 (4%) rectal cancers was MSI-positive, and in this patient no mismatch repair (MMR) gene mutation was found. Right-sided colon carcinomas were more likely to be MSI-positive (14/37 or 38%), followed by left-sided colon carcinomas (7/4 or 17%) (p < 0.05), with 6/14 and 4/7 MMR gene mutations, respectively. The likelihood that a tumor would be MSI-positive was 3.3 times greater for right-sided than for left-sided colon cancer (OR 3.3, p < 0.05). Microsatellite instability was 8.1 times more frequent in colon cancers than in rectal cancers (p < 0.05). The presence of MSI was independently related to fulfillment of the Bethesda criteria (OR 7.0, p = 0.01). In families with multiple cases of colorectal cancer, the rectal cancers are only rarely MSI-positive. This indicates that even in families with multiple colorectal cancers, rectal cancers are most commonly of sporadic origin.

Adult↗

Superficial and metachronous invasive bladder carcinomas are clonally related.

Synchronous and metachronous tumors are frequently observed in the urinary tract and may be explained by the concept of 'field cancerization,' i.e., exposure to carcinogens leading to the independent transformation of many urothelial cells resulting in oncogenetically unrelated tumors. Increasing evidence, however, supports the concept of clonality, i.e., the progeny of a single transformed cell spreads through the urinary system resulting in genetically related tumors. The aim of our study was to investigate the putative clonal origin of invasive urothelial cell carcinomas (UCCs) of the bladder from a prior superficial tumor. We selected 6 patients (5 males and 1 female) with superficial and subsequent invasive UCC tumors. All patients were previously diagnosed with a p53 mutation in their invasive tumor. At least 1 superficial and 1 invasive tumor of the same patient were analyzed for mutations in the p53 tumor suppressor gene by PCR-SSCP and, in case of a band shift, followed by direct sequencing. In all patients the same p53 mutation was found in the superficial and subsequent invasive tumor(s). All tumors arose from the same progenitor cell. These results support the concept of a clonal origin of superficial and metachronous invasive bladder UCCs.

Aged↗

[Erectile dysfunction: prevalence and effect on the quality of life; Boxmeer study].

OBJECTIVE: To assess the prevalence of erectile dysfunction (ED), and its influence on both the quality of life, and health care seeking behaviour. METHOD: An age-stratified random sample was drawn from men aged 40-79 years in Boxmeer, the Netherlands (n = 1771), together with their partners. A questionnaire was mailed to the study population to collect data on ED, and the quality of life, both general and disorder related. The prevalence of ED was measured with the direct question 'Do you have problems getting an erection?'. The influence of ED on sexual function was measured with the Dutch version of the Sexual Function Inventory questionnaire. RESULTS: Seventy percent of all men (n = 1233) and 73% of their partners (n = 1071) responded to the questionnaire. The prevalence of ED increased with age class. To the question regarding problems to get an erection, 13% (95% confidence interval: 11-15%) of all men answered affirmatively (40-49 years: 6%; 50-59: 9%; 60-69: 22%; 70-79: 38%). All men aged 40-49 years of age with ED and 16% of men aged 70-79 with ED considered their ED as bothersome. Amongst 40 to 49 year old men with ED, 64% considered their ED as a big or rather a big problem. Amongst older men this percentage was much smaller: 50-59 years: 38%; 60-69: 37%, and 70-79: 27%. Thirty-four percent of all men with ED and 16% of their spouses were dissatisfied with their sex life. Twenty-five percent of men with ED consulted a doctor, with a mean delay of 13 months. ED bore a strong correlation with the general quality of life and comorbidity. CONCLUSION: ED was a common disorder within the population. Its prevalence was higher among older age groups, but they regarded ED as less of a problem than the younger age groups. Only a quarter of all men with ED consulted a physician.

Adult↗

The relationship between disease activity, joint destruction, and functional capacity over the course of rheumatoid arthritis.

OBJECTIVE: To investigate the relationship between functional capacity, disease activity, and joint destruction over the course of rheumatoid arthritis (RA). METHODS: The followup data on 378 patients with early RA (duration <1 year), included in an open, prospective study since 1985 at the Department of Rheumatology of the University Medical Center Nijmegen, were used. Functional capacity, disease activity, and joint destruction were assessed using the Health Assessment Questionnaire disability index (HAQ DI), the Disease Activity Score (DAS), and a modification of the sharp radiographic damage score, respectively. Multiple linear regression was used to model the data collected at 0, 3, 6, and 9 years after study start, to investigate which variables influenced functional capacity during the disease course. A general linear mixed model for longitudinal data, which included the variables identified as significant in the multiple linear regression models and several interaction terms between the variables, was run. RESULTS: On average, the functional capacity of the patients, as measured by the HAQ DI, worsened over the course of the disease after an initial improvement. After an initial reduction in the extent of disease activity, the mean DAS remained more or less stable over the course of the disease. The mean modified sharp joint damage score worsened over the course of the disease, with a slower progression rate later in the disease. In the multiple linear regression at 0, 3, and 6 years after study start, disease activity was found to be an important factor influencing functional capacity, and at 6 and 9 years, joint damage had an important effect on functional capacity. Furthermore, at 6 and 9 years, there was an interaction effect of joint destruction with disease activity. In the general linear mixed model, disease activity, joint damage, and an interaction effect of disease activity and joint damage were the main factors explaining functional capacity. CONCLUSION: The effect of disease activity and joint destruction on functional capacity changes over the course of the disease. In early RA, functional capacity is most associated with disease activity, and in late disease, with joint damage.

Adult↗

Autosomal dominant inheritance of prostate cancer: a confirmatory study.

OBJECTIVES: To confirm, in a study of a large, independent cohort of families with prostate cancer, the findings of three segregation analyses that have suggested the existence of an inherited form of prostate cancer with an autosomal dominant inheritance mode. METHODS: Between January 1991 and December 1993, 1199 pedigrees were ascertained through single, unrelated, prostate cancer probands who presented for radical prostatectomy at the Division of Urologic Surgery, Washington University Medical Center in St. Louis, Missouri. Maximum likelihood segregation analysis was used to test specifically for mendelian inheritance of prostate cancer. RESULTS: Segregation analyses revealed that the familial aggregation of prostate cancer can be best explained by the autosomal dominant inheritance of a rare (q = 0.0037) high-risk allele. According to the best-fitting autosomal dominant model, 97% of all carriers will be affected by 85 years of age compared with 10% of noncarriers. Furthermore, the autosomal dominant model predicts that the high-risk allele accounts for a large proportion (65%) of all patients diagnosed with prostate cancer before 56 years of age. However, of all prostate cancer cases, a relatively small proportion is inherited (8% by 85 years old). CONCLUSIONS: These results are in agreement with earlier reports of segregation analyses of prostate cancer and strengthen the evidence that prostate cancer is inherited in a mendelian fashion within a subset of families.

Age Factors↗

Absence of karyotype abnormalities in patients with familial urothelial cell carcinoma.

OBJECTIVES: In a previous pilot study, a constitutional balanced translocation t(5;20)(p15;q11) was identified in a family with urothelial cell carcinoma (UCC). The purpose of this study was to find (additional) constitutional chromosomal abnormalities in selected families to obtain an indication for genome location(s) of UCC susceptibility gene(s). METHODS: UCC families were selected through an ongoing study on familial clustering of UCC, the largest study on this subject ever performed. This study included 1193 new patients with UCC of the bladder, ureter, and renal pelvis, identified from the population-based cancer registries of the Dutch Comprehensive Cancer Centers East and South. Information on demographic factors, smoking habits, and family history of UCC was collected by postal questionnaires. UCC in the families was verified with pathology reports. Thirty families were selected in which 2 or 3 individuals were affected, preferably diagnosed at a relatively young age. Blood samples were obtained from all probands, and routine cytogenetic analysis was performed on 23 male and 7 female UCC patients. Subsequent spectral karyotyping was performed in 4 patients from families, which were most suggestive for an inherited etiology. RESULTS: No aberrant chromosomal features were found by either classical or spectral karyotype analyses. CONCLUSIONS: It is conceivable that genetic germline abnormalities do exist in the patients in our study but are below the detection limit of the explorative methods used in this study.

Adult↗

Cancer incidence in relatives of patients with testicular cancer in the eastern part of The Netherlands.

OBJECTIVES: To investigate the incidence of malignant tumors in first-degree relatives of patients with testicular cancer. METHODS: Information about the occurrence of cancer in relatives of patients treated for testicular germ cell cancer (TC) at the Department of Urology of the University Medical Centre Nijmegen from 1986 to 1997 was collected using postal questionnaires from 379 (72%) of 524 patients. The expected numbers of cancers in relatives were computed from age- and sex-specific incidence data in the Netherlands Cancer Registry. The observed/expected (O/E) ratios with 95% confidence intervals (CIs) were calculated using Byar's approximation of the exact Poisson test. RESULTS: The O/E ratio for developing cancer in the families of patients with TC was 1.2 (95% CI 1.0 to 1.3). Among first-degree relatives of patients with TC, more TC was observed than expected (O/E 3.3; 95% CI 1.4 to 6.9). The risk for brothers of patients with TC increased 5.9-fold (95% CI 2.2 to 12.8). Both the risk of developing lung cancer (O/E 1.5) and malignancy of the female genital tract in sisters (O/E 2.8) was slightly increased. In contrast, the risk of urinary tract malignancies (O/E 0.3) and other and unknown primary tumors (O/E 0.2) had a lower incidence among relatives. However, both the increased and decreased risk of nontesticular cancer for first-degree relatives may have been caused by misclassification. CONCLUSIONS: TC clusters in families were more pronounced among brothers than among fathers and sons. This study supports previous reports that families of patients with TC do not seem to be prone to nontesticular cancer. Additional investigations in families with TC are recommended to map candidate genes for TC.

Adolescent↗

Diagnostic efficacy of the ImmunoCyt test to detect superficial bladder cancer recurrence.

OBJECTIVES: To study the diagnostic performance of the ImmunoCyt test in patients in follow-up for superficial urothelial cell carcinoma (UCC) of the bladder. METHODS: Voided urine samples were collected from all included patients. Samples were processed with the ImmunoCyt test. The ImmunoCyt slides were scored under a fluorescence microscope by 3 observers. The ImmunoCyt test was considered positive if one or more observers scored the test positive. Urethrocystoscopy (and additional histologic examination in the case of suspicious cystoscopic findings) was used as the reference standard. To investigate the validity of ImmunoCyt, sensitivity, specificity, positive predictive value, negative predictive value, area under the receiver operating characteristic curve, and diagnostic odds ratios were determined. To investigate the reproducibility of ImmunoCyt, kappa values (measure of agreement) were computed. The observers' findings were analyzed in pairs. RESULTS: One hundred four patients in follow-up after primary superficial UCC of the bladder were included. Samples of 18 patients had to be excluded because of low cellularity (ie, insufficient assessable urothelial cells). Tumor recurrence was found in 22 of the remaining 86 patients (17 pTa, 3 pT1, 1 carcinoma in situ, 1 pT2 or higher). The test had a sensitivity of 50%, specificity of 73%, positive predictive value of 39%, and negative predictive value of 81%. The diagnostic odds ratio was 2.8 (95% confidence interval 1.0 to 7.5). The area under the curve for the different observers varied between 0.54 and 0.60. The kappa values were low (0.05 to 0.45), representing high interobserver variability. CONCLUSIONS: The promising results from other studies could not be confirmed in this specific group of patients in follow-up for superficial UCC of the bladder. The validity of ImmunoCyt was insufficient to justify the omission of cystoscopy in patients in follow-up for superficial UCC.

Adult↗

Routine follow-up examinations in breast cancer patients have minimal impact on life expectancy: a simulation study.

BACKGROUND: Little is known about the effects of routine follow-up examinations on life expectancy in cancer patients. Lately, the benefits of follow-up examinations have been debated, which has given rise to less extensive, though still frequent, follow-up strategies. In this study, a simulation model was applied to evaluate the impact of different follow-up strategies on life expectancy in breast cancer patients. MATERIALS AND METHODS: A five-state Markov chain model was developed, with which various follow-up strategies with regard to frequency and elaborateness were simulated. Calculations were based on a hypothetical population of breast cancer patients treated with curative intent. Medical aspects were studied, such as life expectancy and the proportion of patients who died from breast cancer. Social and psychological aspects and quality of life were not taken into account. Data from the literature were used to estimate the parameters needed for the model. RESULTS: The gain in life expectancy with standard follow-up compared to no follow-up examination, was about 2 months in breast cancer patients aged 50 years treated with curative intent. The percentage of patients who died from breast cancer was 45.4% with standard follow-up, versus 45.8% without follow-up. In older women, the gain was even less. Sensitivity analyses showed that the effects on life expectancy were robust. CONCLUSIONS: Our model showed that standard follow-up had minimal impact on the prognosis of breast cancer patients. It may be unnecessary to continue standard follow-up by medical specialists after the end of the surveillance period of the primary therapy, provided that the patients continue to have easy access to health care facilities in the case of symptoms or concern. However, future research is needed to study quality of life aspects of follow-up.

Adult↗

Increased serum FSH in female fragile X premutation carriers with either regular menstrual cycles or on oral contraceptives.

Fragile X premutations are known to be a risk factor for diminished ovarian function at a relatively young age. We studied endocrine profiles of female fragile X family members (n = 79) at risk of premature ovarian failure (POF). Of these 79 women aged <40 years, 45 had menstrual cycles, and 34 were using oral contraceptives. Of the women with menstrual cycles, the premutation carriers had higher serum FSH concentrations than women who were not carrying the premutation. Even premutation carriers with regular cycles showed increased serum FSH concentrations. Moreover, premutation carriers using oral contraceptives also demonstrated increased serum FSH concentrations. Irrespective of whether oral contraceptives were used, a serum FSH concentration of > or =15 IU/l was more common in the premutation carriers than in the other women. One premutation carrier using oral contraceptives had a serum FSH concentration of >40 IU/l, the threshold that defines POF. We confirmed that premutation carriers with menstrual cycles demonstrate premature ovarian dysfunction. However, we also found endocrine signs of unrecognized ovarian dysfunction in premutation carriers using oral contraceptives, despite endocrine alterations by oral contraceptives. Premutation carriers may have a poorer prognosis for future pregnancy, either achieved spontaneously or by assisted reproductive technology. We recommend that premutation carriers should be counselled not to wait too long if they wish to start a family.

Adult↗

alpha-Blockade improves symptoms suggestive of bladder outlet obstruction but fails to relieve it.

PURPOSE: We investigated the effect of the alpha-blockers alfuzosin, terazosin and tamsulosin on urodynamic parameters after 6 months of therapy. MATERIALS AND METHODS: Between February 1992 and June 1998, 163 patients with lower urinary tract symptoms suggestive of bladder outlet obstruction were treated with alfuzosin (60), terazosin (66) and tamsulosin (37). Patients were evaluated with urodynamic studies, including pressure flow analysis, before treatment and after 6 months of therapy. Initially, all patients were also assessed by the International Prostate Symptom Score questionnaire and measurement of urinary flow rate. RESULTS: The majority of patients had no clear improvement in obstructive parameters, regardless of the alpha-blocker used, as urethral resistance factor and detrusor pressure maximum flow rate decreased by only 4 cm. H2O. There was a clear subjective and statistically significant decrease in International Prostate Symptom Score and quality of life scores of 6 and 2 points, respectively. No relevant statistical difference was noted among the effects of the 3 alpha-blockers on relieving symptoms or improving urodynamic parameters of obstruction. CONCLUSIONS: The alpha-blockers are effective for treating symptoms suggestive of bladder outlet obstruction in patients presenting with lower urinary tract symptoms but not for treating the obstruction.

Adrenergic alpha-Antagonists↗

Posterior tibial nerve stimulation as neuromodulative treatment of lower urinary tract dysfunction.

PURPOSE: Recently, intermittent percutaneous posterior tibial nerve stimulation was introduced as a treatment modality filling the gap between conservative and surgical therapies in patients with certain types of lower urinary tract dysfunction. MATERIALS AND METHODS: In a prospective multicenter trial posterior tibial nerve stimulation was evaluated in 37 patients who presented with symptoms of bladder overactivity, that is the urgency and frequency syndrome and/or urge incontinence, and 12 with nonobstructive urinary retention. Results were recorded in voiding diaries and on quality of life questionnaires before and after treatment. Patients were classified as responders, including those in whom therapy was successful and chose to continue treatment after the initial 12 weeks, and nonresponders, those who chose to stop treatment. RESULTS: Overall, a positive response was seen in 60% of all patients. In patients with bladder overactivity a statistically significant decrease was observed in leakage episodes, number of pads used, voiding frequency and nocturia, and an equal increase in mean and smallest volume voided. Improvements were also seen in nonobstructive urinary retention, including number of catheterizations, total and mean volume catheterized, and total and mean volume voided. Disease specific quality of life and some domains of general quality of life improved, especially of bladder overactivity. Only mild side effects were observed. CONCLUSIONS: Posterior tibial nerve stimulation is a minimally invasive and successful treatment option for patients with certain types of lower urinary tract dysfunction.

Adult↗