Stomach Cancer —
Understand. Diagnose. Treat.
Stomach cancer (gastric cancer) develops when abnormal cells grow uncontrollably in the stomach lining. Expert care by Dr. Aditya Sarin, ESMO Board Certified Medical Oncologist.
What is Stomach Cancer?
Stomach cancer, also known as gastric cancer, occurs when abnormal cells grow uncontrollably in the stomach lining. It is a serious condition that often develops slowly over many years, passing through pre-cancerous stages before becoming invasive cancer.
Early detection is crucial for effective treatment, but symptoms may not appear until the cancer has progressed significantly. Individuals with H. pylori infection, chronic gastritis, or a family history of gastric cancer benefit most from regular endoscopic surveillance and expert monitoring.
Types of Stomach Cancer
Stomach cancer is classified based on the cells where it originates:
Adenocarcinoma
The most prevalent form, originating in the glandular cells of the stomach lining. Accounts for approximately 90–95% of all stomach cancers. Strongly linked to H. pylori infection and diet.
Gastrointestinal Stromal Tumor (GIST)
A rare type of tumor forming in the stomach's connective tissue (interstitial cells of Cajal). Often treated with targeted therapy (imatinib) rather than conventional chemotherapy.
Gastric Lymphoma
Cancer of the immune system cells (lymphocytes) in the stomach wall. MALT lymphoma, associated with H. pylori, can sometimes be cured with antibiotic therapy alone in early stages.
Carcinoid Tumors (NETs)
Slow-growing neuroendocrine tumors developing in hormone-producing cells of the stomach lining. Prognosis is generally favorable, especially when detected early.
Symptoms of Stomach Cancer
Stomach cancer may produce no noticeable symptoms in its early stages. As the disease progresses, common signs include:
Note: Stomach cancer is often asymptomatic in early stages and symptoms can mimic common gastric conditions. If you have persistent digestive complaints lasting more than two weeks, or known risk factors such as H. pylori infection or family history — seek evaluation immediately.
Causes & Risk Factors
Several factors can significantly increase the risk of developing stomach cancer:
H. pylori Infection
A common bacterial infection that can lead to stomach ulcers and is the leading cause of gastric cancer globally.
Diet & Food Habits
High intake of salty, smoked, or processed foods significantly increases stomach cancer risk.
Smoking & Alcohol
Both significantly raise the likelihood of developing stomach cancer and worsen treatment outcomes.
Family History
A first-degree family history of gastric cancer can meaningfully increase personal risk.
Obesity
Excess body weight is associated with an increased risk of gastric cardia (upper stomach) cancer.
Previous Stomach Surgery
Prior surgeries for ulcers or other conditions may raise the risk of developing gastric cancer over time.
Pernicious Anaemia
A condition affecting vitamin B12 absorption that causes chronic stomach inflammation, increasing cancer susceptibility.
Stages of Stomach Cancer
Understanding the stage of stomach cancer is essential for determining the most appropriate treatment approach and prognosis.
Carcinoma In Situ — Innermost Lining Only
Cancer cells are confined to the innermost layer of the stomach lining (mucosa) and have not invaded deeper tissue. Endoscopic resection can be curative at this stage.
Tumor Has Grown Into Deeper Layers
The tumor has grown beyond the mucosa into deeper layers of the stomach wall, possibly involving a small number of nearby lymph nodes. Surgery offers excellent outcomes.
Spread to Nearby Lymph Nodes
Cancer has spread to nearby lymph nodes or grown deeper into the stomach wall with limited nodal involvement. Combined surgery and chemotherapy is the standard approach.
Deeper Invasion and More Lymph Nodes
The tumor has invaded deeper stomach layers and spread to more regional lymph nodes. Multimodal treatment including chemotherapy, radiation, and surgery is typically recommended.
Distant Metastasis
Cancer has spread to distant organs such as the liver, lungs, or peritoneum. Treatment focuses on systemic therapies including chemotherapy, targeted therapy, and immunotherapy, alongside palliative care.
Survival Rates by Stage
An important note on statistics. Survival statistics are population averages. They describe outcomes across large groups of patients and do not predict what will happen to any individual patient. Stomach cancer is frequently diagnosed at a later stage, which makes stage at diagnosis an especially significant factor in outcome.
Stomach cancer survival rate in the United States
| Stage at Diagnosis | 5-Year Relative Survival |
|---|---|
| Localized — confined to the stomach | 75% |
| Regional — spread to nearby structures or lymph nodes | 35% |
| Distant — spread to other organs | 7% |
Source: American Cancer Society, Stomach (Gastric) Cancer Survival Rates, based on SEER data for cases diagnosed between 2015 and 2021.
Stomach cancer survival rate in India
Nationally representative, stage-wise survival data specific to stomach cancer is limited in India. A retrospective study at a tertiary care hospital in Eastern India found a mean survival of just over 20 months among treated patients, with deaths concentrated heavily among those diagnosed at Stage III or IV, reflecting the same late-stage detection pattern seen with several other cancers in India.
Diagnosis of Stomach Cancer
Accurate and timely diagnosis is critical. Dr. Aditya Sarin uses the following tests together to detect, confirm, and characterise stomach cancer before treatment planning begins:
- Upper GI endoscopy (OGD)
- Direct visualisation of stomach lining
- First-line diagnostic tool
- Tissue sample taken at endoscopy
- Pathological cancer confirmation
- HER2 and biomarker testing
- CT Scan — tumour size and spread
- PET Scan — distant metastasis
- Barium Swallow X-ray
- CEA and CA 19-9 tumour markers
- H. pylori serology testing
- Full blood count and chemistry
Treatment Options for Stomach Cancer
Treatment depends on the stage of cancer, tumour location, biomarker profile, and overall health. A multidisciplinary approach ensures the best possible outcome for each patient.
Surgery
The primary curative option for resectable stomach cancer.
- Partial Gastrectomy (stomach portion removed)
- Total Gastrectomy (full stomach removal)
- Endoscopic Resection (early-stage tumours)
Chemotherapy
Drug therapy to shrink tumours or eliminate residual cancer cells.
- Neoadjuvant — shrink before surgery
- Adjuvant — reduce recurrence after surgery
- Palliative — manage advanced disease
Radiation Therapy
High-energy beams targeting and killing cancer cells, frequently combined with chemotherapy for improved effectiveness.
Targeted Therapy
Precision medications targeting specific cancer-driving molecules, such as HER2-targeted drugs for HER2-positive gastric cancer, with fewer side-effects than chemotherapy.
Immunotherapy
Checkpoint inhibitors and other agents that empower the immune system to detect and destroy gastric cancer cells — particularly effective in advanced or PD-L1 positive disease.
Palliative Care
Focuses on comfort, pain management, and improving quality of life — available alongside curative treatments at any stage to address physical and emotional wellbeing.
Latest Advances in Stomach Cancer Treatment
Advanced stomach cancer treatment has expanded meaningfully with the addition of a new biomarker-driven therapy alongside established options. As of 2026, the notable development is the following.
First Targeted Therapy for a Specific Stomach Cancer Biomarker
Zolbetuximab was FDA approved in October 2024, combined with chemotherapy, as a first-line treatment for HER2-negative gastric or gastroesophageal junction cancer that tests positive for a protein called CLDN18.2, alongside a companion diagnostic test to identify eligible patients. It remains one of the newer standard first-line options as of 2026, alongside existing immunotherapy options such as nivolumab and pembrolizumab, giving oncologists more than one biomarker-driven pathway to choose between for advanced disease.
Prevention of Stomach Cancer
While not all stomach cancers can be prevented, adopting healthy habits and managing known risk factors significantly reduces your risk:
Healthy Diet
Increase fresh fruits, vegetables, and whole grains while reducing processed, salty, and smoked foods.
Quit Smoking & Limit Alcohol
Both significantly increase stomach cancer risk — cessation dramatically improves your long-term outlook.
Maintain Healthy Weight
Obesity is linked to increased stomach cancer risk — regular exercise and balanced nutrition are protective.
Treat H. pylori Infection
If diagnosed with H. pylori, seek prompt antibiotic treatment — eradication substantially reduces cancer risk.
Regular Screenings
Individuals with family history or high risk should consider routine endoscopic surveillance for early detection.
Frequently Asked Questions About Stomach Cancer
Common questions patients ask when weighing evaluation, diagnosis, and treatment.
Is H. pylori infection the main cause of stomach cancer?
Can stomach cancer be found early through routine check-ups?
Is all stomach cancer the same type?
Does diet really affect stomach cancer risk?
Is surgery always required for stomach cancer?
What does HER2 or biomarker testing add to stomach cancer treatment?
What is the best treatment approach for stomach cancer in Delhi?
Why Trust Dr. Aditya Sarin for Stomach Cancer Care
Early diagnosis dramatically improves outcomes — expert oncology care at Sir Ganga Ram Hospital, New Delhi.
Specialist GI Cancer Training
ESMO Board Certified Medical Oncologist with extensive training and experience in gastrointestinal cancers, including gastric adenocarcinoma, GIST, and gastric lymphoma.
Advanced Diagnostic Access
High-definition endoscopy, PET-CT, MRI, and comprehensive biomarker testing (HER2, CLDN18.2, PD-L1, MSI) for precise staging and treatment planning.
Full Spectrum of Modern Therapies
Practical access to surgery, chemotherapy, targeted therapy (including newer options like zolbetuximab for CLDN18.2-positive disease), immunotherapy, and radiation — coordinated as one plan.
Personalised Treatment Plans
Every plan is tailored to the patient's cancer stage, molecular profile, comorbidities, and goals — not a one-size-fits-all protocol.
Long-Term Follow-Up & Support
Structured post-treatment surveillance, nutritional guidance for post-gastrectomy patients, and clear communication at every visit.
Trusted Hospital Setting
Consultations at Sir Ganga Ram Hospital, New Delhi — an established multi-speciality centre with full diagnostic, surgical, and inpatient capability.
Don't Wait — Early Diagnosis Saves Lives
If you have risk factors or are experiencing symptoms, schedule a consultation with Dr. Aditya Sarin today. Expert care, personalised for you.
📅 Book a ConsultationMedical Disclaimer. This page is for informational purposes only and does not constitute medical advice, diagnosis or treatment. Every case of stomach cancer is different. Please consult Dr. Aditya Sarin or a qualified oncologist for evaluation, diagnosis and a treatment plan specific to your condition.