What is Granulomatosis with Polyangiitis (GPA)

Granulomatosis with Polyangiitis (GPA) is a rare, systemic autoimmune disease characterized by inflammation of the blood vessels (vasculitis), which primarily affects the nose, sinuses, lungs, and kidneys. It occurs when the immune system mistakenly attacks healthy tissue, leading to the formation of inflammatory nodules called granulomas that can restrict blood flow and damage vital organs.

What body systems does Granulomatosis with Polyangiitis affect?

Granulomatosis with Polyangiitis (GPA) is a multisystem condition. In the early stages, it frequently causes upper respiratory issues like chronic sinus infections, nasal crusting, or nosebleeds. As the disease progresses, it often involves the lungs, causing cough, shortness of breath, or coughing up blood, and the kidneys, where it can cause silent but progressive damage. Because it is a systemic vasculitis, it can also affect the joints, skin, eyes, and nerves.

How common is Granulomatosis with Polyangiitis?

Granulomatosis with Polyangiitis (GPA) is considered an orphan disease. While exact figures vary, the estimated prevalence is approximately 3 to 16 cases per 100,000 people. It typically affects adults between the ages of 40 and 65, though it can occur at any age. Current data suggests it affects men and women with nearly equal frequency, and it is observed more commonly in individuals of Northern European descent.

What is the underlying mechanism of the disease?

The hallmark of Granulomatosis with Polyangiitis (GPA) is the presence of ANCA (anti-neutrophil cytoplasmic antibodies). These antibodies activate white blood cells inappropriately, causing them to attack the walls of small and medium-sized blood vessels. Key features include:

• Inflammation: Widespread vessel damage leads to reduced oxygen delivery to tissues.


• Granuloma formation: The body attempts to wall off inflammation, creating specific tissue masses.


• Organ involvement: The kidneys and lungs are the most frequently targeted organs.

How does it differ from other forms of vasculitis?

Unlike other forms of vasculitis, Granulomatosis with Polyangiitis (GPA) is distinct because of its specific pattern of upper respiratory tract involvement and the high frequency of PR3-ANCA positivity. At DiseaseMaps.org, 111 people with Granulomatosis with Polyangiitis (GPA) have joined our community, reflecting the shared journey of those managing this complex condition.

Next steps

• Consult a rheumatologist or a vasculitis specialist immediately if you suspect symptoms.


• Request a referral for ANCA blood testing and baseline kidney function monitoring.


• Join the DiseaseMaps community to connect with others living with Granulomatosis with Polyangiitis (GPA).

Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Granulomatosis with polyangiitis.


• Orphanet: Portal for rare diseases and orphan drugs (ORPHA: 900).


• Vasculitis Foundation: Patient resources and clinical research updates.


• OMIM (Online Mendelian Inheritance in Man): Entry #601449.