The Gallery test could pinpoint the source of the disease inside the body with great accuracy. In the Simplyfy clinical trial, the test detected signs of cancer in 323 of the 6238 people who visited the General Hospital in England and Wales for suspicious symptoms.
Of the 323 patients, 244 were diagnosed after testing with cancer, with a positive predictive accuracy of 75 percent. The test works by looking for chemical changes in parts of the genetic code that leak from tumors into the bloodstream, but it doesn't detect all cancers.