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      High PR3-ANCA positivity in a patient with chronic inflammatory demyelinating polyneuropathy

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          Abstract

          Proteinase 3 anti-neutrophil cytoplasmic antibody (PR3-ANCA) is reported to be highly specific to vasculitis compared to myeloperoxidase (MPO)-ANCA. We report a case of a 19-year-old woman with chronic inflammatory demyelinating polyneuropathy (CIDP) with high PR3-ANCA positivity. The patient responded well to intravenous immunoglobulin plus oral steroid, and showed no signs of systemic vasculitis during the subsequent 10 months of follow-up. Our present case suggests that CIDP may accompany high PR3-ANCA levels, which should be differentiated from axonal neuropathy due to vasculitis.

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          Most cited references5

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          Standardized neurologic evaluations of 128 patients with Wegener granulomatosis.

          To assess the frequency and type of neurologic involvement in a cohort of patients with generalized Wegener granulomatosis (WG). In a prospective analysis the clinical, electrophysiologic, radiological, and serologic data of 128 patients have been studied over a median observation period of 19 months (range, 1-60 months). Sixty-four patients (50%) revealed central or peripheral nervous system involvement. Peripheral neuropathy (PN) affected 56 patients, in 9 cases the central nervous system was involved, and in 6 cases the cranial nerves were involved. Thirty-one patients showed a distal symmetrical polyneuropathy, 25 a mononeuritis multiplex. Within the first 2 years of the disease course 47 of the 56 patients had developed their PN, sometimes as the initial symptom of WG. Patients with PN were significantly more often male (34 of 65 patients) than female (22 of 63 patients, P =.04), were significantly older at the onset of WG (median age, 53 vs 44 years; P =.001), had a significantly larger disease extent (P =.001), and had higher classic antineutrophil cytoplasmic antibody titers (P =.002) than neurologically unaffected patients. Response to immunosuppression was moderate concerning peripheral nervous system manifestations. Peripheral neuropathy is frequent in generalized WG, occurring early in the disease course. As PN can be the first and sole symptom of a beginning systemic vasculitis, it is important that in cases of PN of an unclear origin, interdisciplinary investigations are initiated to detect, treat, and closely follow-up a possible underlying WG, especially as these patients seem to have a more severe disease course.
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            Prevalence and spectrum of rheumatic diseases associated with proteinase 3-antineutrophil cytoplasmic antibodies (ANCA) and myeloperoxidase-ANCA.

            To evaluate the prevalence and association of antineutrophil cytoplasmic antibodies (ANCA) and their subtypes [proteinase 3 (PR3)-ANCA, myeloperoxidase (MPO)-ANCA] with distinct clinical features in various clinicopathological syndromes. All consecutive ANCA-positive patients seen at the combined unit for rheumatology for Bad Bramstedt and the University of Lübeck between 1989 and 1999 were analysed. ANCA were detected by an immunofluorescence technique and ANCA subspecificities were determined by ELISA. Clinical features at presentation and diagnoses were recorded according to standardized procedures. Among 4620 patients tested, 333 were cytoplasmic ANCA-positive and 291 were perinuclear ANCA-positive. cANCA/PR3-ANCA were strongly associated with Wegener's granulomatosis (WG), whereas pANCA/MPO-ANCA were associated with a diverse disease spectrum. Further investigation of PR3-ANCA-positive (n=80) and MPO-ANCA-positive patients (n=40) revealed a greater extent of disease [disease extent index (DEI); median 8 vs 5, P<0.01] and more frequent involvement of the upper/lower respiratory tract and the eyes in PR3-ANCA-positive than in MPO-ANCA-positive patients. Fewer than 5% of WG patients were MPO-ANCA-positive. Compared with matched PR3-ANCA-positive WG patients, the MPO-ANCA-positive WG patients had a lower DEI (median 5 vs 8) and had a lower frequency of peripheral neuropathy. ANCA testing is useful due to its high sensitivity and specificity, especially for cANCA/PR3-ANCA in WG. We found a divergence in the disease spectrum between PR3- and MPO-ANCA-positive patients, characterized by higher DEI and extrarenal manifestations in the PR3-ANCA group. MPO-ANCA was rarely found in WG and was associated with less organ involvement.
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              What is the significance in routine care of c-ANCA/PR3-ANCA in the absence of systemic vasculitis? A case series

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                Author and article information

                Contributors
                Journal
                eNeurologicalSci
                eNeurologicalSci
                eNeurologicalSci
                Elsevier
                2405-6502
                05 October 2016
                March 2017
                05 October 2016
                : 6
                : 4-5
                Affiliations
                [a ]Department of Neurology, Mitsui Memorial Hospital, Tokyo, Japan
                [b ]Department of Neurology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
                [c ]Department of Nephrology, Mitsui Memorial Hospital, Tokyo, Japan
                [d ]Department of Neurology, Teikyo University School of Medicine, Tokyo, Japan
                Author notes
                [* ]Corresponding author at: Department of Neurology, Graduate School of Medicine, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.Department of NeurologyGraduate School of MedicineUniversity of Tokyo7-3-1, Hongo, Bunkyo-kuTokyo113-8655Japan mkurihara-tky@ 123456umin.ac.jp
                Article
                S2405-6502(16)30031-4
                10.1016/j.ensci.2016.10.001
                5721574
                29260006
                50e48668-0aac-4e77-b760-319b1a837bde
                © 2016 The Author(s)

                This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

                History
                : 29 September 2016
                : 4 October 2016
                Categories
                Letters to the Editor

                pr3-anti-neutrophil cytoplasmic antibody (pr3-anca),chronic inflammatory demyelinating polyneuropathy (cidp),vasculitic neuropathy

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