Our data showed that it could be helpful to examine TPMT genotypes and to measure TPMT activity in Korean patients taking AZA/6-MP to predict the development of leukopenia.

In patients with distal UC, AOI may have no prognostic implications in terms of remission, relapse, or proximal disease extension.

The status of H. pylori is the most important risk factor affecting recurrence. Therefore, adequate eradication regimen and accurate regular evaluation for H. pylori status are needed during follow up of primary gastric low-grade B-cell MALT lymphoma.