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[Descriptive and epidemiologic characteristics of patients with malignant upper urothelial tumors in the endemic area of Lazarevac].

Although there is permanent increase in incidence of malignant upper urothelial tumours [1, 2], these malignancies are rare neoplasms in relation to both all malignant tumours and urotract tumours. Upper urothelial tumours, i.e. tumours of the renal pelvis and ureter are more frequent in the regions affected by endemic nephropathy [3-5]. The aim of this paper was to describe the main epidemiological characteristics in patients with upper urothelial tumours (UUT) in endemic nephropathic (EN) foci in Lazarevac. We analyzed 73 patients treated at the Institute of Endemic Nephropathy, Lazarevac and the Institute of Urology and Nephrology, Belgrade, from January 1, 1992 to December 31, 1994. The descriptive-epidemiological methods was used. The characteristics in patients with histopathologically confirmed upper urothelial tumours were examined. The diagnosis was made on the basis of the clinical picture, echo-sonographic and radioscopic examinations, intravenous and infusion urography and retrograde pielography. With genealogic analysis, a genealogical tree as far as the fourth degree of kinship for each patient, was made both for urothelial tumours and endemic nephropathy. The average age of the patients at the time of diagnosis was 64.2 years, and the majority of the patients (59%) was in the seventh decade of life (Figure 1). Our results are in accordance with the results of other authors who examined the patients with upper urothelial tumours in the regions with endemic nephropathy and out of them [7, 8, 12, 14]. Females were more affected than males (1.4:1). These results are in accordance with the results of other authors who studied the endemic regions [7, 11, 13]. Foreign authors found that males were more affected by upper urothelial tumours [9, 10]. In view of anatomic localization of tumours (Table 2) our results are in accordance with results of the studies carried out in endemic [11, 12, 15, 19] and non-endemic regions [8]. The majority of patients were rural population and lived in villages known as endemic foci (89%) (Table 1). Agriculture was their main or additional occupation. A large number of UUT patients (67%) had endemic nephropathy as well. The other authors from our country found that farmers were most affected [17, 18]. In foreign studies, there are no data on the fact that farming is risk for the appearance of upper urothelial tumours. The family agglomeration of UUT and EN in UUT patients has been observed in all degrees of relation, especially in the second and third generations (Table 3). The obtained results are comparable with hypotheses on a possible mutual or the same aetiological factor for both diseases, which is in accordance with the results of other authors who studied the endemic regions [6, 7, 12, 13].