Blood MALT1 expression in 100 IBD patients [including 25 active (A)‐Crohn's disease (CD) patients, 25 remission (R)‐CD patients, 25 A‐ulcerative colitis (UC) patients, and 25 R‐UC patients] and 25 health controls (HCs) was detected by reverse transcription‐quantitative polymerase chain reaction; besides, serum tumor necrosis factor‐alpha (TNF‐α) and interleukin‐17A (IL‐17A) in IBD patients were detected by enzyme‐linked immunosorbent assay. This evidence concerns the gene IL17A and Crohn disease.