What is the recommended treatment approach for eosinophilic gastritis?

Treatment of Eosinophilic Gastritis

I recommend initiating treatment with corticosteroids as first-line therapy for eosinophilic gastritis, as approximately 70% of patients achieve symptomatic response to steroid-based therapy. 1

Important Diagnostic Caveat

The proposed diagnostic threshold of ≥30 eosinophils/HPF in five separate HPF for "histologic eosinophilic gastritis" can miss clinically significant cases—patients with prominent eosinophils below this threshold show identical clinical presentations, endoscopic findings, and treatment responses. 1 Therefore, treatment decisions should be based on clinical context rather than rigid histologic cutoffs.

First-Line Treatment Options

Corticosteroids (Primary Recommendation)

• Prednisolone is the mainstay of treatment with dramatic therapeutic efficacy in most patients 2, 3
• Approximately 70% of patients achieve documented symptomatic response to steroid-based therapy 1
• Critical limitation: 25% of steroid-responsive patients experience relapse during follow-up 2
• A small subset develops steroid-dependent, relapsing disease requiring long-term therapy 1

Alternative Initial Approaches

• Proton pump inhibitors (PPIs) combined with dietary modification and antihistamines (loratadine) achieved clinical resolution in 62.5% (5/8) of patients who were treated with this non-steroid regimen 2
• This approach is reasonable for patients wishing to avoid corticosteroids initially
• The 3 patients who failed this regimen subsequently responded to prednisone 2

Dietary Therapy

Dietary elimination can be considered as initial treatment strategy before drug treatment to avoid specific allergens 3

• Food allergy is strongly associated with eosinophilic gastritis, particularly in children 4
• Drug allergy is more common in adults with this condition 4
• Dietitian support is essential when implementing elimination diets (extrapolated from eosinophilic esophagitis guidelines) 5

Treatment Algorithm

1. Assess disease severity: Patients with >100 eosinophils/HPF have higher rates of peripheral eosinophilia and multiorgan GI involvement compared to 50-100 eosinophils/HPF 4

2. For moderate disease or patient preference to avoid steroids:

   • Trial of PPI (twice daily) + dietary modification + antihistamine (loratadine) 2
   • If no response after 8-12 weeks, escalate to corticosteroids

3. For severe disease or failed conservative therapy:

   • Initiate prednisolone 2, 3
   • Monitor for clinical response
   • Taper as tolerated

4. For steroid-dependent or refractory disease:

   • Consider novel biologics (anti-IL-4, anti-IL-5, anti-IL-13, Siglec-8 blockers) 6, 7
   • These remain largely experimental but show promise 6

Monitoring and Follow-Up

• Endoscopy with biopsy is necessary to document histologic response, as symptoms may not correlate with inflammation 5
• Assess for multiorgan involvement: 40.9% have concurrent eosinophilia elsewhere in the GI tract, primarily esophagus (39%) and duodenum (15.4%) 4
• Monitor for relapse, which occurs in 25% of initially responsive patients 2

Common Pitfalls

• Do not rely solely on endoscopic appearance: Most patients present with non-specific findings (small patchy erythema/erosions in 75%, ulcers in only 14.3%) 2
• Do not assume spontaneous remission is common: While more than one-third may achieve spontaneous remission 6, most require active intervention
• Do not use rigid histologic thresholds: The ≥30 eosinophils/HPF criterion misses clinically significant cases 1
• Exclude secondary causes: Rule out Crohn disease, H. pylori, parasitic infections, collagenous gastritis, hypereosinophilic syndrome, and systemic mastocytosis before diagnosing primary eosinophilic gastritis 1