Table 2. Frequencies of combination metastasis.

Features	Bladder cancer
	Number	Percentage (%)
One site
Only bone	987	17.8
Only brain	39	0.70
Only lung	1676	30.2
Two sites
Lung and bone	314	5.65
Lung and brain	24	0.43
Bone and brain	24	0.43
Three sites
Bone and brain and lung	18	0.32