While doctors can screen for some cancers, usually, it's only determined after symptoms appear.
"Cancer cells will break off from an initiating tumor and leave behind their trash, and the trash will be floating around in your blood. And, that's basically what they're detecting in these blood tests," said Aldrich.
She said some cancers, like ovarian, will be easier to detect than others.
"It's exciting because it has the potential to catch cancers early and tell us which type we have. There's a long way to go, on the downside. It needs some big clinical trials and more testing ," said Aldrich.
She said personalized medicine is on its way, but there still needs to be a lot of money invested in clinical trials and testing.