Soon, we will no longer have to wait for tumors to grow so big and so heterogeneously mutated that their spread is no longer controllable. With a simple blood test, doctors will be able to scan for circulating cell-free DNA, or cfDNA, and diagnose cancers that would be impossible to spot without the aid of computer algorithms optimized by machine learning processes trained on thousands of cancer patient samples. These circulating genetic clues will tell you not just if you have cancer but what kind of cancer you have and how to kill it. They will even tell you where in your body an otherwise
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