CAR T-cell therapy induces remission in multiorgan IgG4-related disease with hepatobiliary involvement

cytotoxic T cells and attenuation of fibro-inflammatory and B cell-mediated signaling networks on interactome analyses. In this treatment-refractory case of multiorgan IgG4-RD, CD19-directed CAR T cell therapy induced durable, treatment-free remission with normalization of serum IgG4 and improvement across multiple clinical endpoints. Multimodal immune profiling indicates that CAR T cells can reset the B cell compartment and dampen pathogenic T cell and stromal interactions, supporting prospective evaluation of CAR T cell therapy in IgG4-RD.