Oncology

Treatment Strategies for Localized Disease

At a Glance

The standard treatment for localized diffuse gastric cancer is a 'sandwich' approach called perioperative therapy. This involves receiving FLOT chemotherapy both before and after a specialized surgery, known as a D2 lymphadenectomy, to remove the tumor and surrounding lymph nodes.

When diffuse gastric cancer is caught in a localized stage—meaning it hasn’t spread to distant organs—the goal of treatment is usually to remove all of the cancer and prevent it from coming back. Because diffuse gastric cancer is aggressive and often “hides” cells, the standard of care involves a combination of systemic therapy (chemotherapy) and high-precision surgery ^[1]^[2].

The Decision Tree: The Perioperative Approach

Most patients with localized diffuse gastric cancer follow a “sandwich” treatment plan called perioperative therapy. This approach treats the whole body before and after the local treatment (surgery) ^[3].

Phase 1: Neoadjuvant Chemotherapy (Usually 2-3 months): You receive chemotherapy (most commonly the FLOT regimen) for several weeks before surgery ^[3]. The goal is to shrink the primary tumor and kill any microscopic cancer cells that might be floating in the bloodstream but are too small to see on scans ^[4]^[5].
Phase 2: Surgery and Recovery (Usually 1-2 months): The surgeon removes the affected part of the stomach and a wide safety margin of healthy tissue.
Phase 3: Adjuvant Chemotherapy (Usually 2-3 months): After you have recovered from surgery, you receive the remaining cycles of chemotherapy to “mop up” any remaining cells and reduce the chance of the cancer returning ^[5]^[6].

D2 Lymphadenectomy: The Gold Standard

During surgery, it is not enough to just remove the stomach. Gastric cancer often spreads first to the lymph nodes—tiny, bean-shaped filters that surround the stomach.

A D2 lymphadenectomy is a specialized surgical technique where the surgeon removes not just the nodes closest to the stomach (D1), but also the nodes along the major blood vessels that supply the stomach (D2) ^[7]^[8].

Why it matters: Studies have shown that a D2 dissection provides better long-term survival outcomes for patients with gastric cancer because it captures more hidden cancer cells ^[7]^[9].
Expertise is key: This is a complex procedure. It is generally recommended that a D2 lymphadenectomy be performed by an experienced surgeon at a high-volume center to ensure it is done safely and thoroughly ^[9]^[10].

Is Diffuse Cancer “Chemo-Resistant”?

There is a common concern that diffuse-type cancer, especially cases with signet ring cells, does not respond as well to chemotherapy as the intestinal type ^[11]^[12].

While it is true that diffuse-type cancer may show a lower tumor regression grade (the amount the tumor shrinks on a scale from 1 to 3) in some studies, systemic chemotherapy is still considered essential ^[13]^[5].
The FLOT regimen has been a major breakthrough, showing better survival for many patients compared to older treatments, even for those with more aggressive subtypes ^[3]^[14].

Minimally Invasive Surgery

Many patients wonder if their surgery can be done using “keyhole” techniques rather than one large incision.

Laparoscopic and Robotic Gastrectomy: These methods use small incisions and a camera. For many patients with localized disease, robotic or laparoscopic surgery is considered safe and results in oncologically equivalent outcomes to open surgery—meaning the cancer control is just as good ^[15]^[16].
Benefits: Minimally invasive surgery is often associated with less pain, lower blood loss, and a faster return to eating and normal activities ^[17]^[18].
Suitability: Whether these methods are right for you depends on the exact location of the tumor and the surgeon’s expertise in performing a D2 dissection robotically ^[19]^[20].

Measuring Success

After surgery, your doctor will look at the Pathological Stage. They will specifically look at how many lymph nodes were removed and how many were positive for cancer. They will also look at the “margins”—the edges of the tissue—to ensure they are “negative” (clear of cancer) ^[21]^[22]. Clear margins are especially important in diffuse cancer because of its tendency to spread under the surface ^[23].

Common questions in this guide

Why do I need chemotherapy before surgery for diffuse gastric cancer?

Chemotherapy before surgery, known as neoadjuvant therapy, helps shrink the primary stomach tumor and targets any microscopic cancer cells hiding in the bloodstream. This step is crucial for reducing the risk of the cancer spreading or returning later.

What is a D2 lymphadenectomy?

A D2 lymphadenectomy is an advanced surgical procedure that removes the affected part of the stomach along with the lymph nodes surrounding the major blood vessels. This extensive removal helps capture hidden cancer cells and is considered the gold standard for better long-term survival.

Is diffuse gastric cancer resistant to chemotherapy?

While diffuse-type tumors, including those with signet ring cells, can sometimes show lower shrinkage rates than other types, systemic chemotherapy is still essential. Modern regimens like FLOT have proven very effective and significantly improve survival outcomes for these aggressive tumors.

Can stomach cancer surgery be done using minimally invasive techniques?

Many patients are candidates for minimally invasive robotic or laparoscopic surgery, which uses small incisions and a camera. When performed by highly experienced surgeons, these procedures control the cancer just as effectively as open surgery but offer a faster recovery and less pain.

Why are clear surgical margins important?

Clear margins mean the outer edges of the tissue removed during your surgery are completely free of cancer cells when viewed under a microscope. This is especially important for diffuse gastric cancer, which has a tendency to spread invisibly beneath the stomach lining.

Curated prompts to bring to your next appointment.

1.What is the specific goal of the perioperative chemotherapy (the chemo before surgery) for my diffuse-type cancer?
2.How many lymph nodes do you typically remove during a D2 lymphadenectomy, and what is your center's volume for this procedure?
3.Is my tumor located in a way that allows for a subtotal gastrectomy, or will I need a total gastrectomy?
4.Do you recommend the FLOT regimen for me, and how will we monitor its effectiveness given that diffuse-type can sometimes be less responsive?
5.Am I a candidate for a robotic or laparoscopic approach, and do you feel it is oncologically equivalent to open surgery in my specific case?
6.After the first few rounds of chemo, will I have a 're-staging' scan to ensure the tumor hasn't spread before we proceed to surgery?

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Guide Contents

Treatment Strategies for Localized Disease

The Decision Tree: The Perioperative Approach

D2 Lymphadenectomy: The Gold Standard

Is Diffuse Cancer “Chemo-Resistant”?

Minimally Invasive Surgery

Measuring Success

Common questions in this guide

Questions to Ask Your Doctor

Questions For You

Related questions

Get notified when new evidence is published on diffuse gastric adenocarcinoma.

Guide Contents

The Decision Tree: The Perioperative Approach

D2 Lymphadenectomy: The Gold Standard

Is Diffuse Cancer “Chemo-Resistant”?

Minimally Invasive Surgery

Measuring Success

Common questions in this guide

Related questions

References

Get notified when new evidence is published on diffuse gastric adenocarcinoma.