APOB and Oral leukoplakia: After Bonferroni correction for the five biomarkers mentioned above, it was found that there was still a causal relationship between Apolipoprotein B and oral leukoplakia, whereas the correlation between the remaining four biomarkers and oral leukoplakia was no longer significant, but there was still a suggestion of some predisposition to the development of oral leukoplakia (0.05<P<0.0007).