Understanding a new cancer blood test

Pamela Brown sat down with the CEO of Guardant Health Helmy Eltoukhy, whose company created the Shield blood test. It screens for signs of breast, lung, colorectal, ovarian, and pancreatic cancer in some adults. And the test has received approval from the FDA.Pamela also talked with Dr. Lucy De La Cruz, a breast cancer surgeon and oncologist, about what new testing methods will mean for people like her patients.