BBC Link
Interesting stuff...
Overall, the dogs correctly selected the bladder cancer urine on 22 out of 54 occasions.
This success rate of 41% was significantly more than the 14% that could be expected by chance alone.
Also, all of the dogs indicated one of the "bladder cancer free" samples as positive. This patient had been investigated prior to the study and no tumour had been found.
The patient's doctor was sufficiently concerned by the dogs' behaviour to do further tests.
These revealed a tumour in the patient's right kidney which had escaped diagnosis by usual medical tests.
Interesting stuff...