In this case, the suppression of Gd-IgA1 production by telitacicept effectively reduced the patient’s albuminuria levels, indicating that the patient’s albuminuria is associated with the deposition of Gd-IgA1 in the kidneys, i.e., the patient has primary IgAN rather than cGVHD-associated nephropathy. Here, IGHA1 is linked to Nephropathy.