In the present study, we found that a novel subset of fibroblasts (F1) in thyroid tissues of HT patients abundantly expressed the lymphoid chemokines CCL19 and CCL21 (Fig. 2b), as well as BC survival-related gene TNFSF13B (BAFF) and adhesive molecular VCAM1 (Fig. 2b). The gene discussed is CCL21; the disease is hematocrit.