Granulomatosis with polyangiitis in Tunisia.

Area of Science:

• Rheumatology
• Internal Medicine
• Vasculitis Research

Background:

• Granulomatosis with polyangiitis (GPA) is a rare autoimmune vasculitis.
• Geographic variations in GPA prevalence and phenotype are noted, with higher incidence in Northern countries.
• Limited data exists on GPA in African populations.

Purpose of the Study:

• To describe the clinical and laboratory profiles of Granulomatosis with polyangiitis (GPA) patients in Tunisia.
• To identify distinct phenotypic characteristics of GPA in an African cohort.
• To report treatment outcomes and survival rates in Tunisian GPA patients.

Main Methods:

• Retrospective descriptive study of 30 Tunisian GPA patients.
• Data collected from 2000 to 2014 at the University Hospital of la Rabta.
• Analysis included demographics, clinical manifestations, laboratory findings, treatment, and outcomes.

Main Results:

• Mean age at diagnosis was 46±12 years; diagnosis delay averaged 25 months.
• Common manifestations included Ear/Nose/Throat (83%), lung (70%), and renal (56%) involvement.
• Distinct features observed: high prevalence of pleural involvement, lymphadenopathy, sensorimotor neuropathy, and ureter stenosis.
• Antineutrophil cytoplasmic antibodies (ANCA) detected in 90% of patients.
• Induction therapy: cyclophosphamide (90%); Maintenance: azathioprine or methotrexate.
• Relapse rate was 36%; 2-year survival was 60%.

Conclusions:

• Tunisian GPA patients exhibit a unique phenotype compared to European cohorts.
• Early diagnosis and comprehensive treatment are crucial for managing GPA.
• Further research is needed to understand geographic variations in GPA.