In a new study, scientists demonstrated that a test using infrared light can detect the difference between blood samples from patients with lung cancer and samples from those without the disease with up to 81% accuracy.
https://www.livescience.com/health/cancer/fingerprints-of-cancer-found-after-scientists-flash-infrared-light-pulses-at-blood-samples?utm_source=Reddit&utm_medium=Social&utm_campaign=Reddit
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Submission Statement: New blood tests are currently being developed to help diagnose a plethora of cancers, including those of the pancreas, breast and stomach.
Eh, you can do the same thing with traditional spectroscopy