Assessment of Retinal Microangiopathy in Patients with Balkan Endemic Nephropathy Using Optical Coherence Tomography Angiography-A Pilot Study.

Background and Objectives: It is well known that alterations in microvascular structure and function contribute to the development of ocular, renal, and cardiovascular diseases. Accordingly, the presence of fundus vascular changes in patients suffering from chronic kidney disease (CKD) and Balkan endemic nephropathy (BEN) may provide information of prognostic value regarding the progression of renal disease. This study aimed to examine the associations between clinical characteristics and retinal optical coherence tomography angiography (OCTA) parameters in patients with BEN and compare them with those in CKD. Materials and Methods: This pilot study, conducted from March 2021 to April 2022, included 63 patients who were divided into two groups: the first group consisted of 29 patients suffering from BEN, and the second was a control group of 34 patients with CKD. Demographic, laboratory, clinical, and medication data were noted for all the patients included in this study. Each eye underwent OCT angiography, and the results were interpreted in accordance with the practical guide for the interpretation of OCTA findings. Results: Statistically significantly higher levels of total serum protein and triglycerides were recorded in the BEN group than in the CKD group, while the level of HDL cholesterol was lower. Based on the performed urinalysis, statistically significantly higher values of total protein and creatinine were detected in patients with CKD compared to the BEN group. It was demonstrated that the OCTA vascular plexus density of certain parts of the retina was in significant association with systolic and diastolic blood pressure, creatinine clearance, urinary creatinine, total cholesterol, diabetes mellitus type 2, age, body mass index, total serum and urinary protein, sCRP, and diuretic and antihypertensive treatment. Conclusions: In comparison with CKD, BEN leads to more significant disturbances in retinal vasculature density.

Increased Glomerular Filtration Rate in Early Stage of Balkan Endemic Nephropathy.

Background: A previous study indicated that Balkan endemic nephropathy (BEN) patients in the early stage of the disease had significantly higher creatinine clearance (Ccr) than healthy persons. The aim of the study was to assess whether tubular creatinine secretion affects Ccr in early stages of BEN and to check the applicability of serum creatinine-based glomerular filtration rate (GFR) equations in these patients. Methods: The study involved 21 BEN patients with estimated GFR (eGFR) above 60 mL/min/1.73 m2, excluding any conditions that could affect GFR or tubular creatinine secretion, and 15 healthy controls. In all participants Ccr with and without cimetidine and iohexol clearance (mGFR) were measured and eGFR calculated using Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) and Modification of Diet in Renal Disease Study (MDRD) equations. Glomerular hyperfiltration cutoff (GFR-HF) was calculated. Results: There was no significant difference between the groups in Ccr before and after cimetidine or for eGFR, but mGFR was significantly higher in BEN patients than in controls (122.02 ± 28.03 mL/min/1.73 m2 vs. 101.15 ± 27.32 mL/min/1.73 m2; p = 0.032). Cimetidine administration reduced Ccr by 10% in both groups. The ratio of Ccr to mGFR was significantly above one in seven BEN patients and five controls and their mGFR values were similar. Seven other patients and eight controls had this ratio equal to one, while values below one were recorded for seven more patients and two controls. mGFR of all these 14 patients was significantly higher than that of healthy controls (129.88 ± 27.52 mL/min/1.73 m2 vs. 107.43 ± 19.51 mL/min/1.73 m2; p = 0.009). Mean GFR-HF was significantly higher than mGFR in controls, but these two values were similar in BEN patients. eGFR underestimated mGFR in both BEN patients and controls. Conclusion: The ratio of Ccr to mGFR and mGFR to GFR-HF indicated that elevated mGFR in early stages of BEN could be explained by increased glomerular filtration, but tubular creatinine secretion augmented Ccr in a smaller proportion of patients, who did not differ from healthy subjects.

Differences in Risk Factors and Prevalence of Vascular Calcification between Pre-Dialysis and Hemodialysis Balkan Nephropathy Patients.

Aims: The aim of this study was to compare the risk factors and prevalence of vascular calcification (VC) in pre-dialysis and hemodialysis (HD) patients with Balkan endemic nephropathy (BEN) or other kidney diseases (non-BEN). Materials and Methods: The study involved 115 patients, 32 pre-dialysis and 83 HD patients, separated into groups of BEN and non-BEN patients. In addition to interviews, objective examinations and laboratory analyses, VC was assessed using Adragao score. Results: Patients with BEN were significantly older in both groups, while pre-dialysis BEN patients had significantly lower systolic blood pressure, serum cholesterol and phosphorus levels, but higher urinary excretion of phosphorus than non-BEN patients. These differences were lost in HD groups. In pre-dialysis patients, prevalence of VC was lower in BEN than in non-BEN group and mean VC score differed significantly between them (2.8 (1.7) vs. 4.6 (1.8); p = 0.009). No significant difference in VC score was found between BEN and non-BEN patients on HD. Multivariate analysis showed that in pre-dialysis patients VC score >4 was associated with lower iPTH and higher serum cholesterol level, but in the HD group with higher serum triglyceride level and longer HD vintage. Conclusions: Lower prevalence of risk factors for VC in the BEN than non-BEN patients was found in pre-dialysis but not in HD group and this was reflected in the prevalence and severity of VC in the groups. Prevalence of VC and mean VC score were significantly lower in pre-dialysis BEN than in non-BEN patients but not for those on HD.

Upper Urinary Tract Urothelial Cancer in Croatian and Bosnian Endemic Nephropathy Regions.

OBJECTIVES: Endemic nephropathy (EN) is a chronic tubulointerstitial renal disease associated with increased incidence of upper urinary tract urothelial cancer (UTUC) occurring predominantly in geographically limited areas in villages along big Danube river. Based on results obtained by the research it is confirmed that aristolochic acid is causative agent of endemic nephropathy (EN). AIM: The aim of this study was to determine characteristics of UTUC in two endemic areas and analyze trends in 5-year period. METHODS: This study included all patients with UTUC with or without synchronous/metachronous urothelial cancer in urinary bladder, from Croatian and Bosnian EN and non-EN regions. We analyzed archival data bases from all patients with UTUC who were admitted and operated in Department for surgery and urology, General Hospital Josip Bencevic Slavonski Brod in the time period between 2005 and 2010. Analyzed groups of patients were divided and compared as EN group (that includes patients from Croatian and Bosnian EN region) and non-EN group (that includes patients from Croatian and Bosnian non-EN region). All surgical specimens were processed according to standardized pathological procedures. RESULTS: Comparing patients basic characteristics from Croatian and Bosnian EN region there was no significant difference in gender (females were more frequently affected in both EN regions, p=0.99) or age (p=0.43) of patients. We found higher blood levels of urea and creatinine in group of patients from Croatian EN region when compared with group of patients from Bosnian EN region but the difference was not statistically significant (p=0.79 and p=0.44, respectively). In patients from Croatian EN group Hemoglobin levels were significantly lower than levels from Bosnian EN region patients, p=0.0049. In group of patients from Bosnian EN region ureteral tumors were more frequently observed than in Croatian group of patients, when compared with renal pelvis tumors but the difference was not statistically significant (p=0.258). CONCLUSION: Our data showed some differences in tumor localization between to investigated, relatively nearly situated, EN regions in Croatia and Bosnia. Statistically significant difference in hemoglobin levels between Croatian and Bosnian EN regions that should be further analyzed to give some reasonable explanation.

Balkan nephropathy.

Balkan endemic nephropathy (BN), frequently associated to upper urothelial cancer, is a familial chronic tubulointerstitial disease with insidious onset and slow progression to end-stage renal disease. After 60 years of research, its cause remains the major unanswered question. Etiology assumes polygenic susceptibility to the disease in interaction with multiple environmental factors. Chronic intoxication with Aristolochia is the major environmental risk factor for this disease. The mycotoxin hypothesis considers that BN is produced by ochratoxin A. The Pliocene lignite hypothesis assumes that the disease is caused by long-term exposure to organic toxins leached from coal nearby the endemic villages. Exome sequencing of 22,000 genes revealed that mutant genes (CELA1, HSPG2, and KCNK5) in BN patients encode proteins involved in basement membrane/extracellular matrix and vascular tone, which are tightly connected to the process of angiogenesis. SEC61G, IL17RA, and HDAC11 proved to be differently methylated throughout all patient-control pairs. The acetylation of histone lysine residues was detected and found increased at specific sites of H3 and total H4 histones isolated from urothelial cells of patients with BN. The results of molecular biological research will allow the discovery of genetic markers of BN and associated urothelial cancer, permitting early detection of BN-predisposing mutations and identification of susceptible individuals who might be at risk of exposure to environmental agents. The research of gene-gene and gene-environment interactions could lead to further studies to determine the precise risk for BN.

Familial versus environmental factors in Balkan endemic nephropathy in Mehedinti county, Romania, by means of albuminuria and tubular biomarkers: preliminary study.

INTRODUCTION AND AIMS: Balkan endemic nephropathy (BEN), a regional tubulointerstitial kidney disease encountered in South-Eastern Europe, with still undefined etiology and inexorable evolution towards end stage renal disease, raises the question of the relative contribution of family and environmental factors in its etiology. In order to evaluate the intervention of these factors, markers of tubular injury have been assessed, this lesion being considered an early renal involvement in BEN. METHODS: The paper studies relatives of BEN patients currently included in dialysis programmes (for involvement of the family factor) and their neighbors (for involvement of environmental factors) and analyzes them with regard to tubular injury by means of tubular biomarkers (N-acetyl-beta-d-glucosaminidase-NAG and alpha-1-microglobulin), and albuminuria. At the same time, glomerular filtration rate (GFR) (CKD-EPI) was measured. It is considered that, in order to acquire the disease, one should have lived for 20 years in the BEN area. The relatives have been classified according to this criterion. RESULTS: More evident tubular injury was found in the neighbors of BEN patients living for more than 20 years in the endemic area, which argues in favor of environmental factors. Higher levels of urinary alpha-1-microglobulin and albumin in relatives of BEN patients who had been living for more than 20 years in the area than in relatives with a residence under 20 years, plead for the same hypothesis. GFR was lower in persons who had been living for more than 20 years in the BEN area (neighbors and relatives). CONCLUSIONS: Environmental factors could be more important in BEN than family factors.

Renal cell carcinomas of chronic kidney disease patients harbor the mutational signature of carcinogenic aristolochic acid.

Aristolochic acid (AA) is a potent dietary cytotoxin and carcinogen, and an established etiological agent underlying severe human nephropathies and associated upper urinary tract urothelial cancers, collectively designated aristolochic acid nephropathy (AAN). Its genome-wide mutational signature, marked by predominant A:T > T:A transversions occurring in the 5'-CpApG-3' trinucleotide context and enriched on the nontranscribed gene strand, has been identified in human upper urinary tract urothelial carcinomas from East Asian patients and in experimental systems. Here we report a whole-exome sequencing screen performed on DNA from formalin-fixed, paraffin-embedded renal cell carcinomas (RCC) arising in chronic renal disease patients from a Balkan endemic nephropathy (EN) region. In the EN regions, the disease results from the consumption of bread made from wheat contaminated by seeds of Aristolochia clematitis, an AA-containing plant. In five of eight (62.5%) tested RCC tumor specimens, we observed the characteristic global mutational signature consistent with the mutagenic effects of AA. This signature was absent in the control RCC samples obtained from patients from a nonendemic, metropolitan region. By identifying a new tumor type associated with the AA-driven genome-wide mutagenic process in the context of renal disease, our results suggest new epidemiological and public health implications for the RCC incidence worldwide, particularly for the high-risk regions with unregulated use of AA-containing traditional herbal medicines.

[Epidemiology and risk factors of upper urinary tract tumors: literature review for the yearly scientific report of the French National Association of Urology]. / Épidémiologie et facteurs de risque des tumeurs de la voie excrétrice urinaire supérieure: revue de la littérature pour le rapport annuel de l'Association française d'urologie.

AIM: To describe the epidemiology, the risk and genetic factors involved in carcinogenesis pathways of upper urinary tumors UTUCs. MATERIAL: A systematic review of the scientific literature was performed from the database Medline (National Library of Medicine, PubMed) and websites of the HAS and the ANSM using the following keywords: epidemiology; risk factor; tobacco; aristolochic acid; urothelial carcinoma; ureter; renal pelvis. The search was focused on the characteristics, the mode of action, the efficiency and the side effects of the various drugs concerned. RESULTS: The estimated UTUC incidence is 1.2 cases/100,000 inhabitant per year in Europe. The incidence of renal pelvis tumor has been stable for 30years, while the frequency of ureteric locations has increased over time. Locally advanced stage and high grade are more frequent at the time of diagnosis. The median age for diagnosis is 70-years-old. Male-to-female ratio is nearly 2. Main carcinogenic factors are tobacco consumption and occupational exposure. There are specific risk factors for UTUC such acid aristolochic (balkan's nephropathy and Chinese herbs nephropathy). Familial cases are distinct from sporadic cases. UTUCs belong to the HNPCC syndrome and they rank third in its tumor spectrum. CONCLUSION: UTUCs are scarce tumors with specific epidemiologic characteristics. UTUCs share common risk factors with other urothelial carcinomas such as bladder tumors but have also specific risk factors that clinicians should know.

The assessment of arterial stiffness in endemic (Balkan) nephropathy patients undergoing haemodialysis.

Cardiovascular (CV) complications are the most important cause of morbidity and mortality in patients with advanced chronic kidney disease (CKD). Arterial stiffness (AS) has been recognized as a strong and independent predictor for CV events in CKD. Our aim was to assess indices of AS in a group of Endemic (Balkan) Nephropathy (EN) patients undergoing haemodialysis (HD). Hypertenison was not considered an importnat feauture in earlier stages of the disease, and therefore we presumed that those patients would have lower AS. Interestingly, we found AS to be even higher in this group of EN patients. This result should be confirmed in a larger cohort of EN patients.

What do we know about the Balkan endemic nephropathy and the uroepithelial tumors?

Balkan endemic nephropathy (BEN), a familial chronic tubulo interstitial disease with a slow progression to terminal renal failure, affects people living in the alluvial plains along the tributaries of the Danube River. One of its most peculiar characteristics is a strong association with upper urothelial cancer. An increased incidence of upper urinary tract (UUT) transitional cell cancer (TCC) was discovered among the inhabitants of endemic settlements and in families affected by BEN. In areas where BEN is endemic, the incidence of upper tract TCC is significantly higher, even 100 times, than in non-endemic regions. Until now, several hypotheses have been introduced about the etiopathogenesis of BEN. Only the toxic effect aristolochia clematidis has been confirmed as a factor in the occurrence of the disease. We don't have specific biomarkers for an early diagnosis of BEN and UUT-TCC. With application of modern molecular and genetic methods in investigation of etiopathogenesis and diagnosis of BEN and UUT-TCC we should expect improvement in the study of BEN.

Urinary protein patterns in patients with Balkan endemic nephropathy.

PURPOSE: Urinary excretion of beta2-microglobulin (beta2-MG), albumin, immunoglobulin G (IgG) and protein was examined in patients with Balkan endemic nephropathy (BEN), glomerulonephritis (GN) and healthy controls. METHODS: The proteins were measured in morning urine samples from 74 patients with BEN, 50 healthy persons and 22 patients with GN. RESULTS: In BEN patients, median values for albumin, beta2-MG and protein were above upper normal limits, but median IgG was inside normal range. All patients with GN had microalbuminuria (MAU) and half of them had increased urinary beta2-MG, which was also found in eleven patients with increased urinary IgG. In BEN patients, there were significant negative correlations between eGFR and all measured urinary proteins, the composition of which changed during the course of BEN. In patients with eGFR > 60 ml/min/1.73 m(2) isolated beta2-MG was the most frequent finding (10/12 patients), but MAU was present in 4/12 patients. In BEN patients with eGFR between 30 and 59 ml/min/1.73 m(2), beta2-MG appeared as often as the combination of beta2-MG and albumin and isolated MAU. Out of 49 BEN patients with eGFR > 30 ml/min/1.73 m(2) 15 had increased urinary IgG either alone (1) or together with beta2-MG (3) or albumin (3) or beta2-MG and albumin (8). In BEN patients with GFR < 30 ml/min/1.73 m(2) only 1/25 had isolated beta2-MG but increased urinary IgG with increased beta2-MG, and albumin was the most frequent. CONCLUSION: Although low-molecular weight proteinuria was the most frequent urinary finding in BEN patients, MAU was frequently detected in advanced stages of BEN but also in some patients with eGFR > 60 ml/min/1.73 m(2). IgG was increasingly found as eGFR decreased.

[Higher dose of erythropoietin for anemia correction in balkan endemic nephropathy patients].

INTRODUCTION: Balkan endemic nephropathy (BEN) patients maintained with hemodialysis have more severe anemia than patients with other kidney diseases. OBJECTIVE: The aim of the study was to compare the improvement of anemia in BEN patients and those with other kidney diseases during treatment with human recombinant erythropoietin (rHuEpo). METHODS: The study involved 240 patients on regular hemodialysis for more than one year. Out of them 146 had BEN and 94 other kidney diseases (21 glomerulonephritis, 20 hypertension, 18 diabetes, 10 policystic kidney disease, 5 obstructive nephropathy, 18 other diseases). Treatment with rHuEpo was carried out according to European guidelines for the management of anemia. RESULTS: Patients with BEN were older and were less frequently treated with ACEi than patients with other kidney diseases. At the onset of the study mean hemoglobin level (109.6 +/- 22.3 vs. 112.7 +/- 11.3 g/l) was significantly lower, but serum ferritin level and rHuEpo dose (65.4 +/- 22.3 vs. 57.5 +/- 22.5 U/kg/week) were significantly higher in BEN patients than in others. In prospective four months study these differences in hemoglobin levels and rHuEpo doses maintained.The rate of anemia improvement was examined in 15 BEN patients and 10 patients with other kidney diseases at the beginning of rHuEpo treatment. No difference in the rate of anemia improvement was found between the two groups but higher rHuEpo doses were used in BEN patients. CONCLUSION: Patients with BEN on regular hemodialysis had more severe anemia and required higher rHuEpo doses for maintaining target hemoglobin level.

High prevalence of risk factors for chronic kidney disease in Balkan endemic nephropathy foci.

BACKGROUND/AIMS: The aim of this study was to find out the prevalence of the most frequent risk factors for chronic kidney disease (CKD) and the prevalence of urinary abnormalities in adult inhabitants of three Balkan endemic nephropathy (BEN) villages near Bijeljina, Bosnia and Herzegovina. METHODS: The survey consisted of an interview, blood pressure measurement, and urine dipstick test for proteinuria, hematuria, and glycosuria. RESULTS: The study involved 1625 (739 males, aged 51 ± 16 years) subjects: 319 (19.6%) with positive family history for BEN, 585 (36%) with hypertension, 604 (37.2%) above 60 years, 146 (9%) with diabetes, and 566 (34.8%) with none of these risk factors. Proteinuria was present in 6.2-7.1% of the subjects with risk factors for CKD but in 3.4% of those without risk factors. Systolic blood pressure and BEN in brother/sister were found to be significant variables associated with proteinuria, but female gender and history of kidney disease with hematuria. CONCLUSION: In addition to a family burden for BEN, other risk factors for CKD were highly prevalent in BEN villages of the Bijeljina municipality. The frequency of proteinuria was higher in the at-risk group than in the group without risk factors and increased with the number of risk factors.

Pro- and antiapoptotic markers in upper tract urothelial carcinoma associated with Balkan endemic nephropathy.

The role of aristolochic acid in the etiology of Balkan endemic nephropathy (BEN) and associated upper-tract urothelial carcinoma (UTUC) has been recently confirmed. The aim of this study was to determine apoptosis-related marker(s) specific for BEN-associated UTUC. Present investigation included 105 patients with UTUC, 44 from BEN region and 61 control tumors. Altered expression of Survivin was more often present in BEN UTUC with high grade and solid growth (P < 0.005; P < 0.05) than in control tumors. Significantly lower expression of proapoptotic marker Bax was found in BEN tumors with high grade, high stage, necrosis, and without metaplastic change (P < 0.05; 0.05; 0.05; 0.05) compared to control tumors with the same features. Group (BEN-related/control), stage, growth pattern, and caspase 3 activity were significantly associated with the expression of Bax (P = 0.002, 0.034, 0.047, 0.028, resp.,). This investigation identifies Bax as specific marker of BEN-associated UTUC. Decrease of pro-apoptotic protein Bax together with alteration of Survivin may be indicative for specific disturbances of intrinsic apoptotic pathway in UTUC arising in endemic areas.

Urothelial carcinoma associated with Balkan endemic nephropathy. A worldwide disease.

Balkan endemic nephropathy (BEN), a familial chronic tubulo-interstitial disease with a slow progression to terminal renal failure, affects people living in the alluvial plains along the tributaries of the Danube River. One of its most peculiar characteristics is a strong association with upper urothelial cancer. An increased incidence of upper urinary tract (UUT) transitional cell cancer (TCC) was discovered among the inhabitants of endemic settlements and in families affected by BEN. In areas where BEN is endemic, the incidence of upper tract TCC is significantly higher, even 100 times, than in non-endemic regions. A high incidence of urothelial cancer in end-stage BEN patients strongly suggests preventive nephro-ureterectomy in all end-stage patients with BEN treated with either transplantation or dialysis. Better understanding of the molecular mechanisms involved in carcinogenesis and tumor progression, has provided a large number of molecular markers of TCC, with a potential diagnostic and prognostic value. Markers that distinguish among TCC, normal urothelium, and benign urothelial conditions are potentially diagnostic, prognostic, and therapeutic targets. The geographic correlation and presence of AA-DNA adducts in both BEN and associated urothelial cancer, support the speculation that these diseases share a common etiology. Dietary exposure to AA is a significant risk factor for BEN and its attendant transitional cell cancer. These are cases of well-known AA induced urothelial carcinoma, and could be detected worldwide. The presence of more than one risk factors is possible and it is important to test etiological hypotheses in different endemic foci, preferably as a multicentric research.

Upper urothelial carcinoma in Balkan endemic nephropathy and non-endemic regions: a comparative study of pathological features.

Upper urothelial carcinoma (UUC), a rare neoplasm, occurs more frequently in some regions of Balkan countries than in other areas in the world. The aim of this study is to compare phenotypic morphological characteristics of UUC in Balkan endemic nephropathy (BEN) region and control rural and city populations free of BEN, and to determine the characteristic(s) that could discriminate tumors in endemic and non-endemic regions. The authors analyzed biopsies from 88 patients with UUC, 40 patients who live in Balkan endemic (BEN) settlements and 48 control subjects. The histological sections were used to assess morphological variables: histologic grade, pathologic stage (pT), growth pattern, pattern of invasion, lympho-vascular invasion (LVI), presence of necrosis and metaplastic changes (squamous or glandular) within the tumor. Statistically significant differences between the groups were found concerning tumor grade, pattern of invasion, growth pattern and metaplastic changes. High-grade tumors and trabecular/infiltrative patterns of invasion were more frequent in the group of BEN tumors (chi(2)=4.583, p<0.05; chi(2)=8.064, p<0.05). Moreover, solid growth and metaplastic changes are significant in BEN tumor, chi(2)=9.696, p<0.01; chi(2)=9.35, p<0.01, respectively. Discriminant analysis of morphological variables had indicated that BEN and control tumors are significantly different (Wilks' lambda=0.833, chi(2)=15.044 and p<0.05). The best characteristic that differentiated them was growth pattern; i.e., solid growth for BEN tumors and papillary for control tumors.

Balkan nephropathy: evolution of our knowledge.

Balkan endemic nephropathy (BEN), originally described in the late 1950s as a chronic tubulointerstitial kidney disease, is identified by its unique epidemiological features. The most remarkable characteristic of BEN is the focal topographical nature that characterizes its occurrence at the global, national, and even household level. BEN affects only certain endemic rural foci along tributaries of the Danube River in the Balkan countries of Bosnia, Bulgaria, Croatia, Romania, and Serbia. The spatial distribution has remained astonishingly unchanged with time because the disease affects the same endemic clusters as 50 years ago. The natural course of the disease is characterized by universal development of end-stage renal disease and the frequent development of upper urinary tract tumors, posing a substantial disease burden to the afflicted areas. The greatest challenge in the study of BEN has been the elucidation of its cause. The unique features of the disease, in particular its endemic nature and the long incubation period required for the disease to develop, have led to the proposal that BEN represents a unique environmental disease. The quest for the responsible environmental factor has been long and diverse, and although no definitive answer has been provided to date, converging lines of evidence support the theory that long-term consumption of food contaminated with aristolochic acid underlies the pathogenesis of BEN. The present review describes the evolution of our knowledge of BEN in relation to the development of the main theories for its pathogenesis.

Balkan endemic nephropathy and associated urothelial cancer.

Balkan endemic nephropathy (BEN) is a chronic tubulointerstitial disease described only in some rural parts of southeastern Europe. One of its most peculiar characteristics is a strong association with upper urothelial cancer (UUC). BEN-related UUC has the same histological features as other forms of UUC in general, but is more frequently bilateral, less frequently affects the bladder and has a sex ratio close to 1. BEN and BEN-associated UUC share the same etiology. Over time, incidence of these conditions has been declining. Since BEN was first described, around half a century ago, socioeconomic changes (in housing, farming, living standards, etc.) have been profound and have obscured the factors responsible for the observed reduction in incidence. Whatever the causes of BEN, the disease might not be restricted only to southeastern Europe. Rather, the intensity of exposure to risk factors for BEN and, consequently, clustering of cases has more likely determined our knowledge of topographical distribution of an etiological entity that is much more widespread, or that might even be ubiquitous in its sporadic form.

Urothelial cancer in patients with Endemic Balkan Nephropathy (EN) after renal transplantation.

GOAL: Analysis of the incidence of urothelial cancer and outcome of treatment in patients with Endemic Balkan Nephropathy (EN) after renal transplantation. METHODS: From January 1985 until October 2006, 550 kidney transplantations (389 cadaveric) and 5 combined kidney and pancreas transplantations were performed in University Hospital Center Rijeka. In only 6 (1.1%) of 555 transplant recipients, EN was diagnosed as the original kidney disease, based on medical history, clinical findings, and laboratory results, but without pathohistologic verification. All patients with EN received the first renal transplant from a cadaver. Patients' mean age at transplantation was 50.3 +/-15.9 yrs, five patients (83.3%) were male. The incidence of malignant tumors in all 555 transplant recipients was analyzed, with an emphasis on the incidence of urothelial cancer and outcome of treatment in the group of patients with EN. RESULTS: During posttransplant follow-up period, malignancy was diagnosed in 27 (4.9%) out of 555 transplant recipients. Skin cancer was diagnosed in 7 patients (1.3%), followed by cancer of the urinary tract in 6 patients (1.1%) and breast cancer in 3 patients (0.5%). In 3 of 6 patients with EN, urothelial cancer was diagnosed, resulting in the death in two patients. In the third patient, urothelial cancer showed a high affinity for recurrence, and besides the strong reduction of immunosuppressive therapy, repeated surgical treatment was needed. CONCLUSIONS: Patients with EN show a high incidence of urothelial cancer after renal transplantation. A thorough nephro-urological evaluation is needed before transplantation, and a careful follow-up is required afterward to ensure an early diagnosis of malignancy. Preventive nephroureterectomy is recommended.