Cancer Blood Test

Researchers have found a marker that may lead to a simple blood test to screen for colon cancer.

A doctor says it might help spot people who would need more invasive techniques to check for the disease. The researchers looked at a subtle molecular change. People with a family history of colon cancer were five times more likely to have the marker. Patients with polyps, an early stage of cancer development, were three times more likely. Patients with a personal history of colon cancer were 22 times more likely.

A researcher says the molecular change could be spotted in a blood test. But he says it's far too soon to consider this as a testing option.

The researchers were at Johns Hopkins University. The study is in the journal Science.