IFNG and tuberculosis: Before initiating infliximab therapy, we confirmed: (1) negative results for hepatitis B/C serological markers and interferon gamma release assay for tuberculosis, as shown in Table 1; (2) absence of tuberculosis family history and no tuberculosis-suggestive findings on non-contrast chest CT; (3) no malignant lesions detected by contrast-enhanced CT (chest to pelvis) and both upper and lower gastrointestinal endoscopy.