After being diagnosed with stage 3 colon cancer, Jason McGrath is launching a blood test nationwide for the third-most common form of cancer in the U.S.
Two years ago, McGrath, a U.S. Air Force veteran who fought in the Iraq War, was a healthy 42-year-old playing basketball when he felt stabbing pain in his stomach and started turning green.
He drove himself to the emergency room, which sent him home saying he just had constipation.
Later that night, he started vomiting, and was rushed to the…
