using infiltrative-destructive tumor growth , polymorphy , and chromatin density of tumor cell nuclei , extension of renal vein invasion , age and sex , as the only 6 required out of 25 distinguished tumor parameters , this statistical multivariate method comprised 7 distinctive groups of different mean geometrical postoperative survival time , obviously corresponding to 7 tumor types of increasing degree of malignancy .
C0027651
tumor
C0006826
malignancy