Risk of pancreatitis is increased 6-fold in kids with IBD who are treated with azathioprine:
https://www.thelancet.com/journals/lanchi/article/PIIS2352-4642(18)30401-2/fulltext
https://www.thelancet.com/journals/lanchi/article/PIIS2352-4642(18)30401-2/fulltext