Clinical features and prognostic factors of patients with metastatic renal cell carcinoma stratified by age.

The comparison of different age groups showed that with increasing age, single metastases and certain combinations of two sites of metastasis (bone and brain, bone, and liver) occurred less frequently; in contrast, other combinations of two sites of metastases and almost all combinations of three sites of metastases showed an increasing trend with age (P<0.05, Table 2 ).

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