Is a gastric carcinoma with perigastric fat infiltration and perigastric lymph node involvement resectable?

Is Gastric Carcinoma with Perigastric Fat Infiltration and Perigastric Lymph Node Involvement Resectable?

Yes, gastric carcinoma with perigastric fat plane infiltration and perigastric lymph node involvement is generally resectable and should be treated with curative-intent surgery, typically preceded by neoadjuvant chemotherapy for locally advanced disease.

Understanding the Staging and Resectability

The features you describe suggest locally advanced gastric cancer:

• Perigastric fat plane infiltration indicates T3 (subserosal invasion) or T4a (serosal penetration) disease 1
• Perigastric lymph nodes are N1 stations (along lesser and greater curvature) - these are routinely resected during standard D2 lymphadenectomy 2

What Makes Gastric Cancer Unresectable?

According to NCCN guidelines, criteria for unresectability include 2:

• Level 3 or 4 lymph node involvement (distant nodes, not perigastric)
• Invasion or encasement of major vascular structures
• Distant metastasis or peritoneal seeding
• Positive peritoneal cytology

Your case does NOT meet these criteria - perigastric lymph nodes are regional N1 nodes that are expected to be involved in locally advanced disease and are routinely removed during surgery.

Recommended Treatment Approach

For Locally Advanced Disease (≥T2 and/or N+):

Perioperative chemotherapy followed by D2 gastrectomy is the standard of care 1, 3, 4:

1. Neoadjuvant chemotherapy (3 cycles):

   • FLOT regimen is preferred (docetaxel, oxaliplatin, leucovorin, 5-FU) 4
   • ECF/ECX regimens are alternatives 2
   • This approach increases R0 resection rates for T3/T4 tumors 1

2. Surgical resection:

   • Total or subtotal gastrectomy with D2 lymphadenectomy (removal of perigastric N1 and celiac axis N2 nodes) 2
   • Goal: R0 resection with negative margins (≥4 cm from tumor) 2
   • Minimum 15 lymph nodes should be examined for adequate staging 2

3. Adjuvant chemotherapy (3 additional cycles of same regimen) 4

Critical Staging Considerations

Before finalizing treatment, complete the following:

• CT chest/abdomen/pelvis to exclude distant metastases 5, 4
• Laparoscopy with peritoneal washings is recommended for T3/T4 disease to detect occult peritoneal metastases 5, 4, 6
  • If positive peritoneal cytology is found, this changes management to M1 disease 5
• EUS can help differentiate T3 vs T4 tumors (accuracy 65-92% for T staging) 5

Key Prognostic Factors

Number of positive lymph nodes profoundly influences survival 2:

• Patients with <6 metastatic nodes have survival similar to node-negative patients 7
• Extensive nodal involvement (N3) carries worse prognosis but is still surgically addressed

The presence of perigastric lymph nodes alone does not preclude curative resection - nearly 70-80% of gastric cancer patients have regional lymph node involvement at surgery 2.

Common Pitfalls to Avoid

1. Do not confuse perigastric nodes with distant nodes: Perigastric lymph nodes (stations 1-6) are N1 nodes and routinely resected. Level 3-4 nodes (para-aortic) would be unresectable 2

2. Fat plane infiltration is not the same as adjacent organ invasion: T4a (serosal penetration) with perigastric fat stranding is resectable. T4b (invasion into pancreas, spleen, colon) requires en bloc resection but may still be resectable 2

3. Imaging has limitations: CT has only 43-82% accuracy for T staging 2. Surgical exploration may reveal more or less extensive disease than imaging suggests 8

4. Complete staging before declaring unresectability: Laparoscopy detects occult M1 disease in 31% of seemingly resectable cases 2

Bottom Line

Proceed with neoadjuvant chemotherapy followed by curative-intent D2 gastrectomy 1, 4. The features described (perigastric fat infiltration and perigastric lymph node involvement) represent locally advanced but resectable disease, which is the most common presentation requiring multimodality therapy for optimal outcomes.