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Worth noting an MRT is of low value for prevention. Small lesions would be invisible and you could very well progress from nothing visible to seriously sick in 6 month. We really need some marker for before we get unhindered growth.

Even if we had 100% precise AI assisted image analysis, once a year fullbody MRI... the MRI resolution would still not catch the "before things escalate quickly" pre stage of cancer. With imagery catching _most cancers early is inherently a thing of mostly luck.