title: Causes and predisposing factors of de novo tumors in our series of liver transplant recipients.
abstract: BACKGROUND
  Liver transplant recipients suffer a high risk of developing cancer, mainly as a consequence of immunosuppressant treatment, although a variety of other factors are involved. Our purposes were to evaluate the frequency of de novo tumours and to determine predisposing factors.
  
  
  METHODS
  We analyzed all of the transplantations performed during 1990, with a total of almost 700 cases. We analyzed the frequency of de novo tumors, their location, time since transplantation, survival, and recurrence rates and factors that may influence their appearance.
  
  
  RESULTS
  The series included 64 cases in 50 patients with a frequency of 7%. Skin tumors were the most frequent (39.06%), followed by those in the otolaryngologic (ear, nose, and throat) region (15.62%) and the lung (14.06%). The average time to progression between the transplantation and diagnosis was less than 4 years (47.74 months). The recurrence rate was 16%. The factors with the greatest influence on their appearance were age and gender of the recipient, alcohol consumption, and Child-Pugh score. Plasma transfusion was statistically, although not clinically, significant.
  
  
  CONCLUSIONS
  Our frequency of de novo tumors was consistent with that described in the literature. Despite some factors that influence their appearance, the main predisposing factor was immunosuppression and its duration.
authors.affiliation: Liver Transplant and Hepatobiliopancreatic Surgery Unit, General and Gastrointestinal Surgery Department, Hospitales Universitarios Virgen del Rocío, Seville, Spain. ltallona@hotmail.com
authors.forename: L
authors.initials: L
authors.lastname: Tallón Aguilar
authors.forename: L
authors.initials: L
authors.lastname: Barrera Pulido
authors.forename: C
authors.initials: C
authors.lastname: Bernal Bellido
authors.forename: F
authors.initials: F
authors.lastname: Pareja Ciuró
authors.forename: G
authors.initials: G
authors.lastname: Suárez Artacho
authors.forename: J M
authors.initials: JM
authors.lastname: Alamo Martínez
authors.forename: I
authors.initials: I
authors.lastname: García González
authors.forename: M A
authors.initials: MA
authors.lastname: Gómez Bravo
authors.forename: A
authors.initials: A
authors.lastname: Bernardos Rodríguez
mesh_terms: D000367:Age Factors; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D016031:Liver Transplantation / Q000009:adverse effects*; D008175:Lung Neoplasms / Q000453:epidemiology / Q000209:etiology; D008297:Male; D009369:Neoplasms / Q000453:epidemiology* / Q000209:etiology; D010039:Otorhinolaryngologic Neoplasms / Q000453:epidemiology / Q000209:etiology; D012008:Recurrence; D012189:Retrospective Studies; D012727:Sex Characteristics; D012878:Skin Neoplasms / Q000453:epidemiology / Q000209:etiology; D013997:Time Factors