Markers of vitamin B6 status and metabolism as predictors of incident cancer: The Hordaland Health Study

Dietary intake and/or circulating concentrations of vitamin B6 have been associated with risk of cancer, but results are inconsistent and mechanisms uncertain. Pyridoxal 5'‐phosphate (PLP) is the most commonly used marker of B6 status. We recently proposed the ratio 3‐hydroxykynurenine/xanthurenic acid (HK/XA) as an indicator of functional vitamin B6 status, and the 4‐pyridoxic acid (PA) /(pyridoxal (PL) +PLP) ratio (PAr) as a marker of vitamin...