title: Renal Tumor in Allogeneic Kidney Transplant Recipient.
abstract: BACKGROUND
  Malignancies will be a leading cause of mortality in renal transplant recipients in the next 20 years. Renal cell cancer (RCC) is the most common urologic cancer in kidney transplant recipients. The risk of RCC development in kidney transplant recipients is 15-100 times higher than in the general population. The purpose of the current retrospective study was to assess the frequency of nephrectomies performed because of renal tumors in the native kidneys in kidney transplant recipients in the Department of General and Transplantation Surgery at the Medical University of Warsaw between 2010 and 2014 year; the identification of kidney recipients diagnosed with RCC; and epidemiologic, clinical, and histopathological aspects associated with RCC.
  
  
  METHODS
  A total of 319 nephrectomies were performed in the Department of General and Transplantation Surgery at the Medical University of Warsaw between 2010 and 2014 year. Renal tumors were diagnosed in 25 renal transplant recipients.
  
  
  RESULTS
  Among malignant tumors, 13 cases of RCC and 1 case of post-transplant lymphoproliferative disorder (PTLD) were observed. There was no significant difference between age and duration of pretransplantation dialysis in patients with RCC and patients with benign tumors (P = .14 and P = .91, respectively). Body mass index was significantly higher in patients with RCC than in patients with benign tumors (P = .04).
  
  
  CONCLUSIONS
  Renal cell cancer is more common among male kidney recipients. There is a good Polish screening system allowing detection of kidney cancer in native kidney. We recommend performing periodic screening for kidney cancers to obtain an early diagnosis.
authors: Department of General and Transplantation Surgery, Medical University of Warsaw, Warsaw, Poland. Electronic address: monicabien@o2.pl.
authors: M
authors: M
authors: Bieniasz
authors: Department of General and Transplantation Surgery, Medical University of Warsaw, Warsaw, Poland.
authors: A
authors: A
authors: Chmura
authors: Department of General and Transplantation Surgery, Medical University of Warsaw, Warsaw, Poland.
authors: M
authors: M
authors: Kwapisz
authors: Department of General and Transplantation Surgery, Medical University of Warsaw, Warsaw, Poland.
authors: M
authors: M
authors: Czerwińska
authors: Department of General and Transplantation Surgery, Medical University of Warsaw, Warsaw, Poland.
authors: R
authors: R
authors: Kieszek
authors: Department of General and Transplantation Surgery, Medical University of Warsaw, Warsaw, Poland.
authors: P
authors: P
authors: Domagała
authors: Department of General and Transplantation Surgery, Medical University of Warsaw, Warsaw, Poland.
authors: M
authors: M
authors: Wszoła
authors: Department of General and Transplantation Surgery, Medical University of Warsaw, Warsaw, Poland.
authors: M
authors: M
authors: Serwańska-Świętek
authors: Department of Pathology, Medical University of Warsaw, Warsaw, Poland.
authors: B
authors: B
authors: Górnicka
authors: Department of Transplantation Medicine and Nephrology, Medical University of Warsaw, Warsaw, Poland.
authors: M
authors: M
authors: Durlik
authors: Department of Immunology, Transplantology and Internal Diseases, Medical University of Warsaw, Warsaw, Poland.
authors: L
authors: L
authors: Pączek
authors: Department of General and Transplantation Surgery, Medical University of Warsaw, Warsaw, Poland.
authors: A
authors: A
authors: Kwiatkowski
mesh_terms: D000328:Adult; D000368:Aged; D002292:Carcinoma, Renal Cell / Q000453:epidemiology* / Q000601:surgery; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000453:epidemiology* / Q000601:surgery; D016030:Kidney Transplantation / Q000009:adverse effects; D008297:Male; D008875:Middle Aged; D006435:Renal Dialysis / Q000009:adverse effects; D012189:Retrospective Studies; D012306:Risk; D066027:Transplant Recipients