STAT3 and neoplasm: With respect to the relationship between IL‐6 and IL‐17A, some reports have indicated that IL‐6 is elevated in response to IL‐17A‐activated STAT3 in some tumour cells.39, 40 In our study, IL‐6 was increased by IL‐17A stimulation and down‐regulated when IL‐17A signalling was suppressed using an anti‐IL‐17A antibody or an IL‐17A inhibitor.