Anything below 4 is considered OK. Below 3, good, below 2, very good, below 1, awesome. Not dispositive of the absence of prostate cancer, but one significant market. I will also say that the velocity of change of PSA receives a lot of focus these days. Going from a 1 to a 3 in a month or two, for example, is a very bad sign, though in my case, it was the result of an infection, not cancer.