Interestingly, we found that PADI4 mRNA expression of tumor tissues was higher in MDR1 (+) group (Mean -∆Ct ± SD = 0.59 ± 0.37) than that in MDR1 (-) group (Mean -∆Ct ± SD = -1.69 ± 0.53). Here, PADI4 is linked to neoplasm.