P1497INCIDSENCE OF CANCER IN HEMODIALYSIS-TREATED PATIENTS

Abstract

Abstract Background and Aims In recent decades, there has been an increase in the incidence and prevalence of patients with end stage renal disease (ESRD) worldwide. Previous studies have shown an increased incidence of malignancies among ESRD patients, compared to age-matched controls, although it was unclear whether different etiologies of ESRD ( diabetes, hypertension, cystic disease) confer different risk ratio. Our present study intends to re-examine relationships between ESRD, classified according to the etiology of renal disease, cancer incidence and types of malignancies in hemodialysis treated patients. Method We conducted a retrospective study, analyzing hemodialysis (HD) treated patients over the age of 18 at the Wolfson Medical Center in Holon, Israel, from 2008-2017. Patients diagnosed with cancer prior to dialysis or with history of transplantation were excluded. Data on etiology of chronic kidney disease and ESRD, comorbidities and cancer diagnosis was collected from patients' files and verified using the Israeli National Cancer Registry. A single, multivariate survival analysis was conducted to examine the relationship between the various predictors and the incidence of cancer. Results The study included 333 patients, 211 (63.4%) were males, mean age 67.2±13.1 years. The median follow was 4 years (95% CI: 2-6.5). Twenty eight (8.4%), developed primary malignancy during hemodialysis, annual rate: 2.1%, Vs 0.35% age-adjusted annual rate in Israeli general population. The average age of all patients diagnosed with cancer over the study period was higher than that of patients without cancer (72.3±7.7 Vs 66.7±13.4 years. P=0.001). The most common sites of malignancy were colon (33%), bladder (16.7%), kidney (10%) and prostate (10%). Older age was the only risk factor associated with the onset of malignancy. No statistically significant relationship was found between ESRD etiology, comorbidities and occurrence of malignancy. Conclusion Among our cohort of patients on chronic hemodialysis, annual cancer incidence rate is 6 times higher than age matched controls in the Israeli general population. Older age is a risk factor associated with onset of malignancy. We did not found associations between ESRD etiology, comorbidities and cancer incidence. This study constitutes a platform for a longer period multicenter study.