Advanced Gastric Cancer Treatment Strategies: Current Standards, Targeted Therapies, and Outcomes

Gastric cancer is the fourth leading cause of cancer-related death worldwide and the fifth most commonly diagnosed malignancy. Due to delayed diagnosis and limited effective treatments, patients with advanced gastric cancer have historically faced poor outcomes, with average survival around one year.

Traditional therapies often lead to drug resistance and tumor relapse. However, recent advancements in immunotherapy, targeted therapy, antibody-drug conjugates (ADCs), and function-preserving surgeries are opening new doors for more personalized and effective treatment strategies.

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What is Gastric Cancer?

Gastric cancer is a type of cancer that develops in the stomach, an organ located in the upper left abdomen. The stomach plays a key role in digestion and is part of the gastrointestinal tract, which extends from the mouth to the anus.

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Types of Gastric Cancer

Gastric Adenocarcinoma

• Originates from mucus-producing cells in the gastric lining
• Accounts for most stomach cancer cases

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Based on Location

Gastric Cardia Cancer

• Occurs at the junction between the esophagus and stomach

Non-Cardia Gastric Cancer

• Occurs in other regions of the stomach

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Gastroesophageal Junction Adenocarcinoma (GEJ)

• Develops where the esophagus meets the stomach
• Often treated as either esophageal or gastric cancer

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Gastroenteropancreatic Neuroendocrine Tumors (GEP-NETs)

• Arise from neuroendocrine cells in the digestive tract
• Can produce hormones like:
  • Insulin
  • Glucagon
  • Gastrin

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Gastrointestinal Stromal Tumors (GISTs)

• Originate from stromal cells in the GI tract
• Classified as soft tissue sarcomas

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Causes and Risk Factors

Common risk factors include:

• Helicobacter pylori infection
• Advanced age
• Diet high in salted, smoked, or preserved foods
• Chronic atrophic gastritis
• Gastric adenomas
• Family history of gastric cancer
• Cigarette smoking
• Obesity and GERD (for upper stomach cancers)

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Diagnosis of Gastric Cancer

Key Diagnostic Methods

Upper Gastrointestinal Endoscopy

• Visual examination of stomach lining
• Biopsy collection

Histopathological Examination

• Confirms cancer type and grade

Imaging Studies

• CT scan (chest, abdomen, pelvis)
• Detects metastasis and lymph node involvement

Endoscopic Ultrasound (EUS)

• Determines tumor depth and lymph node involvement

Additional Tests

• PET scan
• Laparoscopy

Molecular Testing

• Biomarkers:
  • HER2
  • MSI (Microsatellite Instability)
  • PD-L1

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Traditional Gastric Cancer Treatment

Surgery

Endoscopic Resection

• EMR and ESD for early-stage tumors

Partial (Subtotal) Gastrectomy

• Removes part of the stomach

Total Gastrectomy

• Removes entire stomach and nearby tissues

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Radiation Therapy

• Uses high-energy radiation to kill cancer cells
• Often combined with chemotherapy

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Chemotherapy

Common drug combinations:

• Fluorouracil + Folinic acid + Oxaliplatin + Docetaxel
• Epirubicin + Cisplatin + Fluorouracil
• Oxaliplatin + Fluorouracil + Folinic acid

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Advanced Gastric Cancer Treatment

Immunotherapy

• A major breakthrough in gastric cancer treatment
• Uses immune checkpoint inhibitors

Key Drugs:

• Nivolumab

• Pembrolizumab

• Especially effective in:

  • HER2-positive cases
  • PD-L1-positive tumors
  • MSI-high cancers

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Targeted Therapy

• Targets specific cancer cell markers

Common Drugs:

• Trastuzumab

• Deruxtecan

• Zolbetuximab

• Ramucirumab

• Regorafenib

• Often combined with chemotherapy

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Anti-Angiogenic Therapy

• Blocks blood vessel formation in tumors

• Helps prevent tumor growth and spread

• Future focus:

  • Combination with immunotherapy
  • Biomarker-driven selection

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Palliative Care

• Improves quality of life
• Focuses on:
  • Pain relief
  • Symptom management
  • Emotional and psychological support

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Prognosis and Survival Outcomes

• Median survival: 12–18 months with modern therapies

• Depends on:

  • Tumor biology
  • Molecular subtype
  • Treatment response

• Personalized treatment significantly improves outcomes

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Frequently Asked Questions

What is advanced gastric cancer?

Cancer that has spread to lymph nodes or distant organs (Stage III or IV).

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Is gastric cancer curable?

Advanced gastric cancer is usually not curable, but treatments can:

• Slow progression
• Improve quality of life
• Extend survival

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What is the first-line treatment?

• Systemic chemotherapy
• Followed by:
  • Targeted therapy
  • Immunotherapy (based on biomarkers)

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How long can patients live?

• Median survival: 12–18 months
• Some patients live longer depending on treatment response

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Can immunotherapy treat gastric cancer?

Yes, especially in:

• MSI-high tumors
• PD-L1-positive cancers
• EBV-associated gastric cancer

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References

1. Mayo Clinic – Stomach Cancer Diagnosis and Treatment
2. American Cancer Society – Surgery for Stomach Cancer
3. Li H, et al. Frontiers in Oncology (2024)
4. Cancer Research UK – Chemotherapy for Stomach Cancer