Survival statistics for stomach cancer

Last medical review:

Survival statistics for stomach cancer are very general estimates and must be interpreted very carefully. Because these statistics are based on the experience of groups of people, they cannot be used to predict a particular person's chances of survival.

There are many different ways to measure and report cancer survival statistics. Your doctor can explain the statistics for stomach cancer and what they mean to you.

Net survival

Net survival represents the probability (chance) of surviving cancer in the absence of other causes of death. It is used to give an estimate of the percentage of people who will survive their cancer.

In Canada, the 5-year net survival for stomach cancer is 29%. This means that, on average, about 29% of people diagnosed with stomach cancer will survive for at least 5 years.

Survival by stage

Survival varies with each stage of stomach cancer. Often stomach cancer is not found until it is at an advanced stage, which can make it harder to treat.

There are no specific Canadian statistics available for the different stages of stomach cancer. The following information comes from the United States, which is likely to have similar outcomes as in Canada.

Survival statistics by stage for stomach cancer are often reported as 5-year observed survival. Observed survival is the percentage of people with a particular cancer who are alive at a certain point in time after their diagnosis. Observed survival does not consider the cause of death, so the people who are not alive 5 years after their diagnosis could have died from cancer or from another cause. Observed survival statistics are reported for people with stomach adenocarcinoma (the most common type of stomach cancer) who have been treated with surgery.

Stomach adenocarcinoma observed survival for people treated with surgery
Stage 5-year observed survival
1A 71%
1B 57%
2A 46%
2B 33%
3A 20%
3B 14%


4 4%

People who haven't had surgery will probably have lower survival.

Survival statistics for stomach cancer may also be reported as 5-year relative survival. Relative survival looks at how likely people with cancer are to survive for at least 5 years after their diagnosis compared to people in the general population who do not have cancer but who share similar characteristics (such as age and sex).

Stomach cancer relative survival
Stage 5-year relative survival
cancer is only in the stomach (localized) 69%
cancer has grown into lymph nodes around the stomach (regional) 31%
cancer has spread to other parts of the body (distant) 5%

Questions about survival

Talk to your doctor about your prognosis. A prognosis depends on many factors, including:

  • your health history
  • the type of cancer
  • the stage
  • certain features of the cancer
  • the treatments chosen
  • how the cancer responds to treatment

Only a doctor familiar with these factors can put all of this information together with survival statistics to arrive at a prognosis.

Expert review and references

  • Michael Sanatani , MD, FRCPC
  • American Society of Clinical Oncology (ASCO) . Cancer.Net: Stomach Cancer. 2020:
  • Surveillance, Epidemiology and End Results (SEER) Program. SEER Cancer Stat Facts: Stomach Cancer. Bethesda, MD: National Cancer Institute; 2019:
  • Canadian Cancer Statistics Advisory Committee. Canadian Cancer Statistics 2021. Canadian Cancer Society; 2021.

Medical disclaimer

The information that the Canadian Cancer Society provides does not replace your relationship with your doctor. The information is for your general use, so be sure to talk to a qualified healthcare professional before making medical decisions or if you have questions about your health.

We do our best to make sure that the information we provide is accurate and reliable but cannot guarantee that it is error-free or complete.

The Canadian Cancer Society is not responsible for the quality of the information or services provided by other organizations and mentioned on, nor do we endorse any service, product, treatment or therapy.

1-888-939-3333 | | © 2024 Canadian Cancer Society