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B12 is vital for red blood cells, nerves and DNA, but unexplained high levels may point to an underlying health problem.

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Compared to the NN group, a persistent elevated plasma B121000 ng/mL was strongly associated with the occurrence of solid cancer (HR 5.90 [95% CI 2.7912.45], p<0.001), contrary to non-persistent plasma B12 elevation (p=0.29)