Özet:

Abstract Objective: The aim of this study is to evaluate the clinical features, treatment approaches and outcomes of primary malign renal tumors in children. Material and Methods: The oncology charts of children diagnosed and followed up with primary malign renal tumors between 2006 and 2020 were retrospectively analyzed. Demographic and clinical characteristics, treatment approaches and follow-up of the patients were noted. Results: In this period, 49 of 950 children with malignant disease had primary renal kidney tumors (5.2%). The patients' age ranged from three days to 13 years (median, 3 years). The male to female ratio was 25/24. The most common symptom and signs were abdominal mass. Both patients had bilateral disease (4.1%). Pathological diagnoses were Wilms tumor (n = 44, 89.8%), mesoblastic nephroma (n = 2, 4.1%), clear cell sarcoma of the kidney (n = 2, 4.1%), and primary synovial sarcoma of the kidney (n = 1, 2%). Only two of the patients with Wilms tumor had diffuse anaplasia. The risk groups of our patients were low (n=4, 8.3%), intermediate (n=35, 72.9%) and high risk (n=9, 18.8%). Follow-up periods ranged from two months to 15 years (median, 5 years). Overall and event free survival rates were 72.7% and 59.7%, respectively. Overall and event-free survival rates of Wilms tumor were 79% and 63%. Conclusion: Multidisciplinary approaches have increased success rates in primary malignant kidney tumors, especially in Wilms tumor. After that, it should be focused on both increasing the success of the treatment and reducing the treatment-related side effects.

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