ITPA genotyping test does not improve detection of Crohn’s disease patients at risk of azathioprine/6-mercaptopurine induced myelosuppression. Allorge D, Hamdan R, Broly F, Libersa C, Colombel JF. (Gut. 2005 Apr;54(4):565.) http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=15753546&query_hl=31&itool=pubmed_DocSum