Mortality in Wegener's granulomatosis: a bimodal pattern

Area of Science:

• Rheumatology
• Epidemiology
• Clinical Medicine

Background:

• Wegener's granulomatosis (WG) is a rare autoimmune disease affecting small to medium-sized blood vessels.
• Understanding long-term mortality is crucial for patient management and prognosis.

Purpose of the Study:

• To assess and characterize the long-term mortality patterns in patients diagnosed with Wegener's granulomatosis.
• To compare mortality rates of WG patients against a matched population-based control group.

Main Methods:

• Utilized the UK General Practice Research Database (6.25 million patients).
• Identified 255 WG patients diagnosed between 1989-2004.
• Matched each WG case with 10 controls for age, gender, and practice, with a mean follow-up of 6.4 years.

Main Results:

• WG patients exhibited a 9-fold increased mortality risk in the first year post-diagnosis (HR 9.0), particularly those ≤ 65 years (HR 19.9).
• Excess mortality decreased after the first year but remained elevated: 1-5 years (HR 1.68), 5-10 years (HR 2.41).
• Mortality risk significantly increased again between 10-15 years (HR 4.4), with Kaplan-Meier curves showing increased mortality after 8 years.

Conclusions:

• Despite current therapies, WG patients have a substantially elevated risk of death in the first year, primarily due to infection, active vasculitis, and renal failure.
• Mortality risk is lowest between 1 and 8 years post-diagnosis but remains higher than the general population.
• An unexplained increase in mortality risk emerges from 8 years onwards, necessitating further investigation.