title: [Occurrence of associated tumours in chronic lymphocytic leukemia].
abstract: BACKGROUND
  Chronic lymphocytic leukemia is one of the most common hematologic malignancy.
  
  
  OBJECTIVE
  The aim of the authors was to investigate the characteristics of malignancies associated with chronic lymphocytic leukemia in patients diagnozed between 2000 and 2015.
  
  
  METHODS
  Data of patients with chronic lymphocytic leukemia who had other associated tumours were analysed using the Leukemia/Lymphoma Registry of the Szabolcs-Szatmár-Bereg County, Hungary and patient records.
  
  
  RESULTS
  Between January 1, 2000 and December 31, 2015, 526 patients with chronic lymphocytic leukemia were diagnosed. 95 patients of the 526 patients (18.06%) were diagnosed as having associated other tumours. In 48/95 patients (50.5%) the first diagnosed tumour was chronic lymphocytic leukemia, in 23/95 patients (24.2%) the first recognized malignancy was the associated tumour, whereas in 24/95 patients (25.3%) synchron tumours were diagnosed. The number of patients with more than one associated tumour was 10/95 (10.5%). The total number of tumours was 107. The incidence of chronic lymphoid leukemia increased in the period between 2000 and 2015 as compared to the period between 1983 and 1999 (3.19 vs 5.65/100 000 person/year). The occurrence of associated malignancies increased as well (8.06% vs 18.06%). In addition to the most common tumours (colorectal, breast, lung, prostate), skin squamous cell carcinoma (17/95 patients; 17.9%) and melanoma (6/95 patients; 6.3%) also frequently occurred. The second malignancies were most frequently discovered after the diagnosis of chronic lymphocytic leukemia and synchron tumours accounting for 78.5% (84/107) of all associated tumours. The incidence of second malignancies decreased 10 years after the diagnosis of chronic lymphocytic leukemia.
  
  
  CONCLUSIONS
  The possible reasons for the high frequency of other tumours associated with chronic lymphocytic leukemia are elderly age of patients, immunsuppressed state and, presumably, chemotherapy of patients with chronic lymphocytic leukemia. During the follow up of patients the high risk for the development of associated tumours should be considered. Therapy of patients should be initiated when it is neccessary. Orv. Hetil., 2016, 157(44), 1752-1756.
authors: Hematológiai Osztály, Szabolcs-Szatmár-Bereg Megyei Jósa András Oktatókórház Nyíregyháza, Szent István u. 68., 4400.
authors: László
authors: L
authors: Szerafin
authors: Hematológiai Osztály, Szabolcs-Szatmár-Bereg Megyei Jósa András Oktatókórház Nyíregyháza, Szent István u. 68., 4400.
authors: János
authors: J
authors: Jakó
authors: Hematológiai Osztály, Szabolcs-Szatmár-Bereg Megyei Jósa András Oktatókórház Nyíregyháza, Szent István u. 68., 4400.
authors: Lóránt
authors: L
authors: Varju
mesh_terms: D000367:Age Factors; D001943:Breast Neoplasms / Q000453:epidemiology; D015179:Colorectal Neoplasms / Q000453:epidemiology; D005260:Female; D006801:Humans; D006814:Hungary / Q000453:epidemiology; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000453:epidemiology* / Q000628:therapy*; D008175:Lung Neoplasms / Q000453:epidemiology; D008223:Lymphoma / Q000453:epidemiology; D008297:Male; D009101:Multiple Myeloma / Q000453:epidemiology; D011471:Prostatic Neoplasms / Q000453:epidemiology; D012737:Sex Factors
keywords: associated/second malignancies; chronic lymphocytic leukemia; krónikus lymphoid leukaemia; laphámcarcinoma; squamous cell carcinoma; társuló/másodlagos daganatok