The short answer
SEER reports a 39.8% five-year relative survival rate for stomach cancer overall. Localized stomach cancer is 78.1%; distant (metastatic) disease is 8.1%. Stomach cancer often causes vague symptoms, so it can be found later than cancers with more obvious warning signs.
A survival statistic describes a large group diagnosed years ago — not a prediction for any one person.
For stomach cancer, the five-year relative survival rate for everyone combined, diagnosed 2016–2022, was 39.8%.
Stage at diagnosis makes a large difference: localized disease is 78.1% versus 8.1% for distant (metastatic) disease.
HER2 and microsatellite instability (MSI) testing increasingly guide treatment for advanced stomach cancer.
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The full explanation.
Before you look at the numbers
Three things are true about the numbers below. Read them before you read a single percentage.
First, a "5-year relative survival rate" for stomach cancer describes a large group of people. Those people were diagnosed with stomach cancer years ago. It is not a prediction about you. Everyone's cancer, body and treatment plan are different.
Second, this data lags behind today's care. These figures reflect people diagnosed with stomach cancer between 2016 and 2022. Treatment has kept developing since then. That includes newer targeted and immunotherapy drugs for stomach cancer. So stomach cancer treatment today may already work better than these numbers suggest.
Third, an all-stages number blends very different people together. It mixes people with early, easy-to-treat cancer with people whose cancer had already spread. For stomach cancer, the stage-specific numbers below beat one blended average. And "5-year" is just a measurement window researchers use for consistency. It is not a life expectancy for anyone with stomach cancer. It is not a deadline either.
The SEER numbers for stomach cancer
SEER's most recent report covers people diagnosed with stomach (gastric) cancer between 2016 and 2022. Across every stage combined, the five-year relative survival rate was 39.8%. Localized stomach cancer is caught before it spreads. Its outlook is much better than the overall number suggests.
Stomach cancer symptoms are often vague early on. Indigestion or mild stomach pain, for example. That can delay diagnosis.
| Stage at diagnosis | 5-year relative survival |
|---|---|
| Localized — confined to the stomach | 78.1% |
| Regional — spread to nearby lymph nodes | 39.0% |
| Distant — spread to other parts of the body | 8.1% |
| Unknown/unstaged | 33.6% |
What "relative survival" actually means
Relative survival compares two groups. One is people with stomach cancer. The other is people in the general population who are the same age and sex but do not have cancer. Say the relative survival rate is 100%. That means people with the cancer were, as a group, about as likely to be alive at 5 years as people without it. It is not the same as the share of people who are cancer-free. And it is not the share of people who die from the cancer itself.
Molecular testing matters more and more in stomach cancer treatment. HER2 status and microsatellite instability (MSI) matter most. Both can open up targeted or immune-based treatment options for advanced disease.
What actually changes your outlook
A statistic describes a group. Your outlook depends on things specific to you.
- Stage — how far the stomach cancer has spread, as shown in the table above.
- Grade — how abnormal the cancer cells look under a microscope, and how fast they tend to grow.
- HER2 status — some stomach cancers make extra HER2 protein and can be treated with HER2-targeted drugs.
- Microsatellite instability (MSI) status — can predict response to immunotherapy.
- How your cancer responds to treatment — early scans and lab results often tell your care team more than the statistics at diagnosis do.
- Your overall health — other medical conditions, age, and general fitness all affect treatment options and recovery.
- Access to care — timely diagnosis, specialist care, and the ability to complete treatment all matter.
Questions for your care team
- Which SEER stage describes my stomach cancer, and what is its five-year number?
- Which biomarkers or molecular tests matter in stomach cancer, and were they run on my sample?
- How do my age and overall health change these stomach cancer statistics for me?
- Are there newer stomach cancer treatments available now that this data doesn't reflect yet?
- Beyond the general stomach cancer statistics, what does my team expect in my case?
- Where can I find support for how it feels to hear these stomach cancer numbers?
- Has my stomach cancer been tested for HER2 status or microsatellite instability (MSI)?
If these numbers are hard to sit with
You may feel scared, numb or overwhelmed after reading survival statistics. That is a normal reaction. It does not mean you are handling a stomach cancer diagnosis the wrong way. Many people find it easier to take these numbers in slowly, with someone else in the room. Others skip the numbers altogether until they are ready. Cancer Anxiety and Uncertainty covers the fear these stomach cancer numbers can stir up. It is also worth telling your stomach cancer team how much detail you want, and when.
Sources
Words to know
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Common questions
What does 39.8% five-year relative survival mean for stomach cancer?
It means that, on average, people diagnosed with stomach cancer between 2016 and 2022 were about 39.8% as likely to be alive 5 years later as people of the same age and sex without stomach cancer. It blends every stage together, from early to advanced.
Why is the stage-specific number so different from the overall number?
The overall number blends people found early, when stomach cancer is most treatable, with people found later. Stage makes a large difference — see the table above. Localized stomach cancer usually has a much higher five-year relative survival than distant (metastatic) disease.
Does this number predict what will happen to me?
No. This is a statistic about a large group of people, not a prediction about you. Your age, overall health, tumor biology, and how your stomach cancer responds to treatment all shape your individual outlook in ways a group statistic cannot capture.
Is this the most current data available?
It is the most recent data SEER has published, but it still reflects people diagnosed in 2016–2022. Treatments keep changing, so people diagnosed today may do better than these numbers suggest.
Why is stomach cancer often found at a later stage?
Early stomach cancer often causes mild or no symptoms, such as occasional indigestion, that can easily be mistaken for something less serious. Symptoms that clearly point to stomach cancer, like unexplained weight loss or persistent pain, tend to appear once the cancer is more advanced.
Questions to ask your doctor
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Last updated: 2026-08-17Next planned review: 2027-08-03
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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