The application discloses a novel
autoantibody combination for idiopathic retroperitoneal
fibrosis and diagnostic and monitoring applications thereof. The application screens and verifies five iRPF-specific autoantibodies, including anti-RBPJ
antibody, anti-TPM1
antibody, anti-C1D
antibody, anti-NPM1 antibody, anti-IL-1
A antibody, and IgG4 subtypes of the above antibodies; the autoantibodies are significantly increased in iRPF patients and have a medium and above ability to identify iRPF, wherein the anti-C1D antibody can effectively distinguish iRPF from RPS; and the anti-TPM1, NPM1 and RBPJ antibodies can also be used for
disease activity monitoring. The screened autoantibodies directly reflect the autoimmune nature of iRPF, have higher specificity than existing laboratory indicators, can be detected by conventional laboratory equipment, have low cost and good promotion, and have good clinical application prospects.