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He consulted in 1988  for  an  impaired  general  status, and  laboratory  tests  revealed  oliguric acute  renal  failure. Histological  analysis of  renal biopsy  found a necrotizing vasculitis with extracapillary proliferative  glomerulonephritis.  The  patient was  treated  with  corticosteroids  and oral cyclophosphamide. No renal function  improvement  occurred,  and  renal replacement therapy was required until the patient died in 2003. <br></br><br></br>CASE 2 <br></br>A 72-year-old male, a farmer living in a rural  environment.  In  April  2004  he complained  of  cough,  expectoration, fatigue,  and  anorexia.  His  family  history  revealed  that  the  patient  reported as  case  1 was  his  brother. His  parents had  died  at  an  advanced  age,  and  he had two sisters with type 2 diabetes mellitus, one of them with a history of pulmonary tuberculosis. <br></br><br></br>Based on his personal history,  clinical  signs,  and  renal  function  impairment,  a  renal  biopsy  was  performed, <br></br>which confirmed  the presence of PNG in  the  setting  of  a  systemic  vasculitis associated  to  P-ANCA (positive  anti-MPO, titer 442 U/mL). <br></br><br></br>DISCUSSION <br></br>Pauci-immune necrotizing glomerulonephritis with extracapillary proliferation  is  the  renal  pathological  expression of systemic vasculitis. This group of diseases is characterized by inflammation  of  small  and  medium-sized <br></br>blood vessels, and includes Wegener¿s granulomatosis  (WG),  microscopic polyangeitis  (MPA),  Churg-Strauss <br></br>syndrome, or vasculitis  limited  to  the kidney.3 <br></br><br></br>Their etiopathogenesis is unknown. Occurrence of  these diseases  in  several members of a same family has suggested  that genetic  factors could contribute  to  its  occurrence.1 We  report two cases of PNG as a renal manifestation  of  systemic  vasculitis  in  two brothers. In case 2, the disease started when  the  first  patient  had  already died. The presence on the same disease  in  two  brothers  could  support  the genetic component in the etiopathogenesis of vasculitis. <br></br><br></br>Some  researchers have  attempted  to find  associations  of  vasculitis  with HLA genes.1 Recent studies found a positive association with HLA DR1, particularly in patients with WG, and negative  associations  with  HLA DR3, <br></br>particularly  in  Churg-Strauss  granulomatosis and polyarteritis nodosa.1, 4 Our patient  had  the  haplotype A1, B8 B35 Cw4 Cw7 DR3 and DR5 DQ2. Case 1 haplotype  is  unknown  because  the  patient died before the second patient experienced the disease. <br></br><br></br>It has also been suggested that environmental  factors  could  contribute  to disease  development  in  genetically <br></br>predisposed  individuals.2 Patients  reported  here  lived  in  a  rural  environment,  and  some  environmental  component may possibly have contributed to  occurrence  of  the  same  disease  in both patients. <br></br><br></br>In  conclusion,  these  two  cases  of PNG as an expression of systemic vasculitis in two brothers living in a similar environment could support the suggested  hypothesis  of  an  influence  of environmental factors on the etiopathogenesis of vasculitis in genetically predisposed individuals. 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