The HB-Chip can spot a single cancer cell lurking among a billion healthy ones . (AP Photo/PNAS Early Edition)

Includes updated information on the latest test format.

A blood test so sensitive that it can spot a single cancer cell lurking among a billion healthy ones is moving one step closer to being available at your doctor’s office.

Boston scientists who invented the test and health care giant Johnson & Johnson will announce Monday that they are joining forces to bring it to market. Four big cancer centers also will start studies using the experimental test this year. Get the full story »