PMID- 34006155 OWN - NLM STAT- MEDLINE DCOM- 20220301 LR - 20220301 IS - 1744-8409 (Electronic) IS - 1744-666X (Linking) VI - 17 IP - 7 DP - 2021 Jul TI - Avacopan for the treatment of ANCA-associated vasculitis. PG - 717-726 LID - 10.1080/1744666X.2021.1932466 [doi] AB - Introduction: Anti-neutrophil cytoplasm autoantibodies (ANCA)-associated vasculitides (AAVs) are a group of rare heterogeneous diseases characterized by blood vessel inflammation resulting in organ destruction and death. Although various treatment strategies have resulted in marked improvement in vasculitis-specific outcomes, many patients with AAV continue to suffer from complications related to the prolonged use of glucocorticoids (GC) such as infections, metabolic abnormalities, and increased cardiovascular morbidity. Recently, activation of the alternative complement pathway has been implicated in the augmentation of the damage caused by AAV via the complement C5a receptor (C5aR1, CD88). Specifically targeting this pathway may lead to improved outcomes in patients with AAV.Areas covered: In this article, we have summarized the rationale for targeting the complement pathway in AAV. The relevant pre-clinical, phase I, II and III findings with emphasis on the efficacy, and safety of avacopan, a new oral competitive inhibitor that interferes with the binding of C5a to C5aR1 (CD88), are reviewed.Expert opinion: These results are encouraging, may led to major changes in the treatment approach for AAV, and give rise to future studies utilizing complement inhibitors in AAV patients, and potentially in other immune mediated diseases. FAU - Osman, Mohammed AU - Osman M AD - Division of Rheumatology, University of Alberta, Edmonton, Alberta, Canada. FAU - Cohen Tervaert, Jan Willem AU - Cohen Tervaert JW AD - Division of Rheumatology, University of Alberta, Edmonton, Alberta, Canada. FAU - Pagnoux, Christian AU - Pagnoux C AD - Vasculitis Clinic, Division of Rheumatology, Department of Medicine, Mount Sinai Hospital, University of Toronto, Toronto, Ontario, Canada. LA - eng PT - Journal Article DEP - 20210528 PL - England TA - Expert Rev Clin Immunol JT - Expert review of clinical immunology JID - 101271248 RN - 0 (Aniline Compounds) RN - 0 (Antibodies, Antineutrophil Cytoplasmic) RN - 0 (Nipecotic Acids) RN - O880NM097T (avacopan) SB - IM MH - Aniline Compounds/adverse effects MH - *Anti-Neutrophil Cytoplasmic Antibody-Associated Vasculitis/drug therapy MH - Antibodies, Antineutrophil Cytoplasmic MH - Complement Pathway, Alternative MH - Humans MH - *Nipecotic Acids/adverse effects OTO - NOTNLM OT - ANCA OT - avacopan OT - complement OT - glucocorticoids OT - vasculitis EDAT- 2021/05/20 06:00 MHDA- 2022/03/03 06:00 CRDT- 2021/05/19 05:34 PHST- 2021/05/20 06:00 [pubmed] PHST- 2022/03/03 06:00 [medline] PHST- 2021/05/19 05:34 [entrez] AID - 10.1080/1744666X.2021.1932466 [doi] PST - ppublish SO - Expert Rev Clin Immunol. 2021 Jul;17(7):717-726. doi: 10.1080/1744666X.2021.1932466. Epub 2021 May 28.