QJM, Vol 91, Issue 7 457-463, Copyright © 1998 by Oxford University Press
V Stefanovic
Aetiology remains the main unanswered problem in Balkan endemic nephropathy
(BEN) despite investigations into the roles of genetic factors,
environmental agents and immune mechanisms. Evidence has accumulated that
BEN is an environmentally-induced disease. Weathering of low-rank coals
near to the villages where BEN is endemic produces water-soluble polycyclic
aromatic hydrocarbons and aromatic amines, similar to metabolic products of
acetaminophen that cause analgesic nephropathy. Many of these compounds are
known to be carcinogenic and could also cause urothelial cancer. Genetic
studies have supported genetic predisposition to BEN. The candidate genes
have been localized to a region between 3q25 and 3q26, the 3q BEN marker
being detected in both BEN patients and in some healthy relatives with
initial morphological changes peculiar to BEN. Three bands with increased
frequencies of spontaneous and induced aberrations contain oncogenes. The
frequent association of BEN and urinary tract tumours (UTT) can be
explained by the chromosomal hypothesis of oncogenesis. The results of
molecular biological investigations will allow the identification of
genetic markers of BEN, permitting early detection of BEN-predisposing
mutations and identification of susceptible individuals who may be at risk
of exposure to the environmental agents. An increased incidence of tumours
of renal pelvis and ureter in patients with BEN and in population from
endemic settlements has been observed. Familial clustering of the UTT was
also reported. The frequency of urinary bladder tumours in BEN-endemic
settlements is also increased compared with the non-endemic villages and
cities. The geographic correlation between BEN and UTT supports the
speculation that these diseases share a common aetiology.
REVIEWS
Balkan endemic nephropathy: a need for novel aetiological approaches
Institute of Nephrology and Haemodialysis, Faculty of Medicine, Nis, Serbia, Yugoslavia.
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