Abstract
Anti-proteinase 3 anti-neutrophil cytoplasmic antibodies (anti-PR3 ANCA) represent an established serologic marker of active granulomatosis with polyangiitis, but their role as a serologic marker in inflammatory bowel disease (IBD) remains uncertain. This study evaluates the presence of anti-PR3 ANCA and their validity as a serologic marker to aid in the diagnosis of IBD. Retrospectively, 142 serum samples obtained at early stages of the disease were analyzed with a new chemiluminiscent assay for the measurement of anti-PR3 ANCA. The results were correlated to the diagnosis, clinical, and therapeutic data, and ANCA and anti-Saccharomyces cerevisiae antibody (ASCA) measurements available from routine clinical practice. Anti-PR3 ANCA were significantly more prevalent (p < 0.0001) and their titers significantly higher (p < 0.0001) among ulcerative colitis compared with Crohn’s disease patients. Receiver operating characteristic curve analysis performed with anti-PR3 ANCA titers to assess the diagnostic accuracy of the assay gave an area under the curve of 0.81 (95 % CI (0.76–0.89); p < 0.0001), with a cut-off titer of 11.8 chemiluminescent units displaying 52.1 % sensitivity and 97.3 % specificity for ulcerative colitis. Combining anti-PR3 ANCA positivity with IgA ASCA negativity as the diagnostic parameter demonstrated highest diagnostic utility, with a sensitivity and specificity of 47.5 % and 98.2 %, respectively. In our cohort, anti-PR3 ANCA was significantly more prevalent in ulcerative colitis than in Crohn’s disease patients, which suggests a possible role of anti-PR3 ANCA as a serologic marker to aid in the diagnosis of IBD.
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Abbreviations
- ASCA:
-
Anti-Saccharomyces cerevisiae antibody
- AUC:
-
Area under the curve
- cANCA:
-
Cytoplasmic anti-neutrophil cytoplasmic antibodies
- CIA:
-
Chemiluminescence assay
- CD:
-
Crohn’s disease
- CU:
-
Chemiluminescent units
- GPA:
-
Granulomatosis with polyangitis
- IBD:
-
Inflammatory bowel disease
- IIF:
-
Indirect immunofluorescence assay
- pANCA:
-
Perinuclear anti-neutrophil cytoplasmic antibodies
- ROC:
-
Receiver operating characteristic
- UC:
-
Ulcerative colitis
- WG:
-
Wegener’s granulomatosis
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Acknowledgments
We acknowledge the help of Chelsea Bentow with immunoassays and Carolina Santa Cruz and Milagros Toca for their help with the sera collection and routine testing. M Teresa Arias-Loste is a Lopez-Albo fellow from the Marques de Valdecilla Foundation-IFIMAV. The guarantor of the article is Marcos López-Hoyos, Servicio Inmunología, Hospital Universitario Marqués de Valdecilla, 39008 Santander, Spain; E-mail, mlopezhoyos@humv.es
Conflict of Interest
All authors have approved the final draft submitted. Michael Mahler is employee of INOVA Diagnostics, selling autoantibody assays. The other authors have no conflict of interest.
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Arias-Loste, M.T., Bonilla, G., Moraleja, I. et al. Presence of Anti-proteinase 3 Antineutrophil Cytoplasmic Antibodies (Anti-PR3 ANCA) as Serologic Markers in Inflammatory Bowel Disease. Clinic Rev Allerg Immunol 45, 109–116 (2013). https://doi.org/10.1007/s12016-012-8349-4
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DOI: https://doi.org/10.1007/s12016-012-8349-4