C- ANCA positivity indicates, antibody formed against which of the following?
Correct Answer: Proteinase 3
Description: C-ANCAs (Cytoplasmic anti-neutrophil cytoplasmic antibodies), are a type of autoantibody formed against proteinase 3. P-ANCA (Perinuclearanti-neutrophil cytoplasmic antibodies) are antibodies directed against myeloperoxidase. Ref: Harrison's Principles of Internal Medicine, 16th Edition, Page 2002; Thurlbeck's Pathology Of The Lung, William M. Thurlbeck, 3rd Edition, Page 372; Rheumatology Secrets, Sterling G. West, 2nd Edition, Page 226.
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