Certain kinds of cancer are being diagnosed more often in younger adults in the US, a new study shows, and the increases seem to be driven by cancers in women and adults in their 30s.
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Is it not extra cancer but better diagnosis tools?
Hardly any cancers grow so slowly, that they would be found decades before they caused symptoms.
For your hypothesis to be true, a cancer would need to be detectable today (but not 20 years ago) in an adult (say, 30), but not cause any symptoms until the 40s or 50s (where cancer cases were "traditionally detected). That’s rather unlikely.