A biopsy for DIF is negative. IIF is positive for IgG antibodies directed against monkey esophagus. Which of the following is true regarding the diagnosis?
A. The primary target antigen is desmoglein 1
B. A positive DIF would show intercellular and linear IgG & C3 along the BMZ
C. It is associated with bronchiolitis obliterans
D. Autoantibody titers correlate with disease activity
E. There are no FDA-approved treatments
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