The mRNA level of IL-17A was 3.3[2.0, 5.5] in polyp tissues and 0.8[0.4, 1.2] in normal controls, and the mRNA level of MUC5AC was 4.4[2.3, 6.3] in polyp tissues and 1.2[0.4, 2.2] in normal controls. This evidence concerns the gene MUC5AC and polyp.