Well, not quite yet. At least not a general one. But according to a recent press release, pharmaceutical giant Johnson&Johnson is supporting researched geared towards a cancer blood test that would locate a cancer cell among a billion normal ones.  A group of scientist located in Boston will work closely together with J&J to develop the test further to make it hopefully available soon to a broader audience. In addition to that, four of the largest cancer centers in the United States have agr...