What is a D2 Dissection in Gastric Cancer Surgery?
A D2 lymphadenectomy (D2 dissection) is the standard surgical procedure for locally advanced gastric cancer that involves removal of the primary tumor along with systematic dissection of perigastric lymph nodes (N1 stations) and second-tier lymph nodes along the major vessels (N2 stations), specifically lymph node stations 1-12 as defined by Japanese classification. 1, 2
Anatomic Definition and Extent
D2 lymphadenectomy encompasses:
- All D1 lymph node stations (perigastric nodes along the lesser and greater curvature)
- Second-tier N2 stations including:
- Nodes along the left gastric artery (station 7)
- Common hepatic artery (station 8)
- Celiac axis (station 9)
- Splenic hilum (station 10)
- Splenic artery (station 11)
- Hepatoduodenal ligament (station 12)
The critical distinction is that D2 dissection should now be performed with spleen and pancreas preservation whenever technically feasible, as randomized trials (particularly JCOG 0110) demonstrated that routine splenectomy increases morbidity without survival benefit. 2
Clinical Indications
D2 lymphadenectomy is indicated for:
- All cT2-T4 gastric cancers (tumors invading beyond the mucosa)
- cT1N+ tumors (early gastric cancer with suspected nodal involvement)
- Any potentially curable gastric cancer where lymph node metastases are suspected
D1 or D1+ lymphadenectomy is reserved only for:
- cT1N0 tumors (early gastric cancer without nodal involvement)
- Tumors that don't meet endoscopic resection criteria but are very early stage
Technical Considerations and Expertise
The procedure requires significant surgical expertise, adequate training, and high case volume to achieve acceptable morbidity rates. 3 This is why centralization of gastric cancer surgery to high-volume centers is increasingly emphasized.
Key technical points:
- Complete clearance of nodal stations without routine organ resection
- Splenectomy should only be performed if the tumor directly invades the spleen or is located in the greater curvature of the upper stomach requiring complete clearance of station 10 nodes 2
- Pancreas-preserving technique is standard 4
Evidence Base and Guideline Support
The evolution of D2 as standard of care represents an interesting case where Eastern surgical expertise preceded Western evidence-based validation. 5 While initial Western trials (Dutch, MRC) showed increased morbidity with D2, this was attributed to routine splenopancreatectomy. Long-term follow-up from the Dutch trial eventually demonstrated decreased recurrence rates with D2. 6, 4
Current guideline consensus (2025):
- NCCN guidelines recommend D2 as category 1 for localized gastric cancer 1
- Japanese guidelines have maintained D2 as standard since 1981, now in their 7th edition (2025) 7
- ESMO and Pan-Asian adapted guidelines support D2 for advanced disease 8
Clinical Implications for Treatment Planning
If less than D2 dissection is performed, perioperative systemic therapy becomes an alternative option to compensate for inadequate nodal clearance. 1
Postoperative management differs based on extent of dissection:
- After D2 dissection: postoperative chemotherapy is recommended 1
- After suboptimal (<D2) or R1/R2 resection: postoperative chemoradiation is conditionally recommended 9
The adequacy of lymphadenectomy directly impacts both staging accuracy and therapeutic benefit, making D2 the optimal approach for achieving both goals in locally advanced gastric cancer. 3