A Japanese government-sponsored project led to the development of a screening method that can detect cancer with just one drop of blood. Clinical trials are underway. The test, said to be over 90% accurate, can detect 13 types of cancer. A similar test for cancer requiring just a drop of urine has already been put to practical use. The key is a 1mm-long creature that reacts to the smell of cancer patients' urine. Both tests can be taken easily and are expected to lead to early detection of cancer.