“The biggest problem in detection of such cells is that these cells are extremely rare- one in a billion blood cells,” says Goda.
According to Goda, the cutting edge device now harbors an unprecedented false-positive rate of one cell in a million.
For anyone who has forgotten statistics like me and was thrown off by this: https://en.wikipedia.org/wiki/Type_I_and_type_II_errors#Fals...
The false positive rate is the proportion of absent events that yield positive test outcomes, i.e., the conditional probability of a positive test result given an absent event.