Fig. 3

The subgroup analyses were performed according to age (Young group vs. Older group) of CCRC patients in SEER data set. According to the patients’ sex, race, marital status, size, grade, laterality, SEER historic stage A, radiation, and chemotherapy, we divide CCRCC patients into different subgroups such as male, female, black, white, other race, single/other, married, tumor size dmax<=4 cm, 4 cm < dmax<=7 cm, grade I, II, III, IV, left, rught, Localized, regional, distant, radiation no, radiation yes, chemothera no, chemothera yes, and compare the survival difference between young and old in each subgroup and calculate the corresponding HR value