Background/aim: This study aimed to comparatively analyze the expression levels of the SLC1A1 gene in renal specimens from tumorsand adjacent healthy kidney tissues of patients with clear cell renal cell carcinoma (ccRCC).Material and methods: Nineteen patients diagnosed with ccRCC were included in the study. The expression levels of the SLC1A1 andGAPDH genes were measured in tumor and formalin-fixed paraffin-embedded (FFPE) tissue specimens from the adjacent healthykidney of each subject. Via the GEPIA database, the distribution of SLC1A1 gene expressions in ccRCC and healthy kidney tissues wasobtained. The relative expression of SLC1A1 was evaluated for the association with the clinical parameters of the patients.Results: The expression of the SLC1A1 gene was significantly higher in males than females (P = 0.029). Also, there were statisticallysignificant associations between stages II–IV and Fuhrman grades 2–4 with respect to SLC1A1 gene expression (P < 0.001 for both).Moreover, low levels of red blood cell and hemoglobin counts were significantly associated with the SLC1A1 expression (P < 0.001 andP = 0.005, respectively). The expression of the SLC1A1 gene in tumor tissues increased approximately 3 times compared with normalkidney tissues (P < 0.05). According to the GEPIA database, SLC1A1 gene expression is significantly higher in ccRCC patients thanhealthy persons (P = 0.01).Conclusion: The change in the expression of SLC1A1 may be crucial for ccRCC pathophysiology.