The following aspects must be emphasized when tumor staging is carried out.

Prior to surgical intervention the majority of patients with lesser tumor (89.3%) was considered to belong to T3a stage of cancer. This stage was set in accordance with results of pre-operative study. Local spreading of a tumor was evaluated on the basis of three-dimensional bioplasm machine-study data mainly – is a neoplasm comes out of a kidney’s contour, this stage was considered as T3a. However following study of a preparation by morphologists, that was acquired during organ-preserving or organ-removing operation has proven that in majority of patients was not growing of a tumor into paranephric fat, but squeezing of fibrous capsule of a kidney, not affected by a neoplasm. T3a stage of cancer was confirmed in 13.1% of patients corrected.