Table 2. Percent marker-positive cells in various human prostate tumours.

Human prostate tumours	TRA-1-60	CD151	CD166	Triple positive
DU-145 tumour (brain metastasis)	0.8	17.9	34.3	0.4
PC3 tumour (bone metastasis)	0.1	27.0	40.0	0.1
VCaP tumour (vertebral metastasis)	0.5	16.3	9.5	0.3
PC-82 tumour (primary)	0.2	14.1	27.2	0.1