A recently developed method of diagnosing 13 kinds of cancer from a single drop of blood can lead to early detection of the disease. The relatively inexpensive test puts less burden on patients, but it still needs further improvement in accuracy.
http://www.pressherald.com/2017/08/12/early-cancer-detection-method-said-to-find-tumors-from-blood/
Early cancer-detection method said to find tumors from blood