Abstract:

Objective: To present the postoperative and oncological outcomes of patients diagnosed with unclassified renal cell carcinoma (uRCC). Materials and Methods: Radiological and pathological data of patients who underwent radical nephrectomy for renal tumour diagnosed with uRCC according to histopathologic evaluation were investigated between 2006 and 2013. Follow-up data, such as metastasis-free and overall survivals, were also evaluated. Patients’ characteristics and data were compared between localised tumour (T1-T2) and locally invasive tumour (T3-T4) groups and metastasis positive and negative groups during follow-up, separately. Results: A total of 17 patients participated in the study, wherein 7 had adrenalectomy in addition to radical nephrectomy and 3 had lymph node dissection. The mean tumour diameter was 91.9±44 mm (30-200 mm), and seven patients were pathologically T3a, two were T3b and one patient had T4 tumour, whereas eight had Fuhrman grade 4 and five had Fuhrman grade 3 tumours. Pathologically, seven patients had tumours with sarcomatoid features, whereas four had microvascular invasion and seven had renal sinus invasion. T-stage correlated with renal sinus invasion and was identified as an important factor in metastasis progression. The overall survival time was observed to be low in locally invasive and metastasis positive groups. Nevertheless, differences were not statistically significant. In the investigation of factors affecting metastasis development, microvascular invasion and renal sinus invasion were significant. Conclusion: The study revealed more aggressive nature (advanced stage, bigger tumour, more aggressive histopathological features and more metastasis and shorter survival on follow-up) of uRCC tumours, even without obtaining statistically significant differences.

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