Keep sending the posts up. Did you hear about this company that...

Keep sending the posts up. Did you hear about this company that from a single droplet of blood - a single droplet - could detect almost any disease. Theranos! Currently in court on fraud charges. I'd be very careful about believing glossy brochures from the states promising detection up to 4 years BEFORE conventional. Strangely the post diagnosis is at 89% but way way back at 4 years prior its only fallen to 62% detection. Amazing.
The biggest problem with DNA is that the tumor has to orginate from a specific gene. Unless you are test all of the sqillion genes then it will miss a lot of them. Colostat looks at proteins produced by the tumor itself. Broad based proteins that exist in almost all CRC tumors and increase in saturation as the tumor progresses.
Colostat is better at detection, its cheaper and the test can be analysed by standard lab equipment. None of the competition you are mentioning can meet any of these points.