In patients not given concomitant methotrexate, the incidence was 16/ 185 (8.6%), compared to 1/ 19 (5.3%) when adalimumab was used as add-on to methotrexate. lon In patients with Crohn’ s disease, adalimumab antibodies were identified in 7/ 269 subjects (2.6%) treated with adalimumab.