en Nephrology Nephrology Original Research Original Research Renal transplantation is considered one of the best long-term therapies for chronic renal failure, but unfortunately the incidence of malignancy significantly increases in renal transplant recipients. We analyzed nine cases of malignancy in 200 renal transplant recipients occurring in a 12-year follow-up in Imam hospital of Tehran University, Tehran, Iran. According to this study, the organ most commonly affected with malignancy in our series was the skin and the mean time of neoplasm occurrence after kidney transplantation was 2.9 years. Kidney transplantation; malignancy; immunosuppression. 33 36 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-298-350&slc_lang=en&sid=1 FARAHNAZ FALLAHIAN 20031947532846004483 20031947532846004483 Yes From the Nephrology and Kidney Transplantation Section, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, I.R.lran. MOHAMMAD REZA KHATAMI 20031947532846004484 20031947532846004484 No PARVIZ JABAL AMELI 20031947532846004485 20031947532846004485 No ABAS RAHIMI 20031947532846004486 20031947532846004486 No