Although the rare missense variant found in our family was not detected in any of the MGH subjects, the common FGFBP2 variant, rs758329 was enriched in the MGH test IgG4‐RD cohort (76.2%, compared to 40.3% for the population at large). This evidence concerns the gene FGFBP2 and immunoglobulin G4-related sclerosing disease.