Purpose: To research association between Mean Platelet Volume (MPV) and tumor stage and grade in non-metastatic renal cell carcinomas in circumstances of hypoxia, thromboembolism, and ischemia, based on MPV increase. Material and methods: Data of 104 non-metastatic patients, in whom nephrectomy was done and whose pathology resulted in renal cell carcinoma, have been evaluated retrospectively. The patients were clinically classified as T1a, T1b, T2a, T2b according to TNM stage and as Fuhrman

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... e 1, 2, 3, 4 according to pathology results. Preoperative mean platelet number and MPV values of the patients were compared with their tumor stage and grade. Results: Sixteen (15%) were in T1a, 41 (39%) were in T1b, 39 (38%) were in T2a, and 8 (7%) of the patients were in T2b clinical stage. According to pathology results, 21 (20%) were assessed as Fuhrman grade I, 59 (57%) were grade II, 22 (21%) were grade III, and 2 (2%) of the patients were grade IV. Mean MPV values were 8.50±1.39, 8.51±1.25, 8.65±1.12, and 8.95±0.07 in Grade I, II, III, IV, respectively. A positive correlation was present between mean MPV and grade (r= 0.052, p=0.599). As long as grade increases, mean MPV values were observed to increase. However, no statistically difference was determined between tumor grade and mean MPV and platelet (p values: 0.935 and 0.963, respectively). No statistically significant difference was detected between tumor stage and mean MPV and platelet (p values: 0.996 and 0.397, respectively). Conclusion: A positive correlation was observed to be between mean MPV values and tumor grade. However, no statistically significant difference was determined. It can be supported with the larger series that MPV for renal tumors, that is rapidly and expansively growing tumor, can be an effective biochemical indicator in early diagnosis, staging, and evaluation of response to treatment.