Absolute Rac1 protein levels in the IBD patient groups in remission with thiopurine monotherapy on AZA/MP (median 1.18 AU) or TG (median 1.36 AU) did not differ from Rac1 protein levels in IBD patients with active disease (median 0.94 AU), (p > 0.01). This evidence concerns the gene RAC1 and inflammatory bowel disease.