Scientists at Israel’s Weizmann Institute have discovered that most tumors have fungi growing inside them. They have also documented their types using records from 17,000 cancer patients. DNA from fungi is detectable in the blood and can be used to develop a new cancer screening method.

https://www.timesofisrael.com/fungus-is-telltale-cancer-sign-possibly-screenable-by-blood-test-israel-us-study/