CCL19 and non-small cell lung carcinoma: Additionally, TRCs and B-cell zone reticular cells (BRCs) are interconnected with the vasculature through perivascular reticular cells (PRCs), which facilitate immune cell trafficking and contribute to the overall regulation of immune responses.4 Onder and colleagues revealed that CCL19-expressing FRCs are essential for establishing specialized TLSs and T-cell tracks in NSCLC.