CD19 and psoriasis: In the present study, we found that the percentages of circulating CD19+CD24hiCD38hi and CD19+CD24hiCD27+ Bregs were decreased in AS patients compared to those in HCs, and the percentages of CD19+CD24hiCD27+ Bregs in patients with active AS were lower than those in patients with inactive AS, which is consistent with a previous report in psoriasis [25].