In the western world, 5 year survival is 10–30%, while in Japan it is reported to be 30–40%. This number is considered to include more operated for early gastric cancer. Among those operated curatively, the absolute 5 year survival is about 50%. The prognosis reflects that many are diagnosed late in the disease course.
5 year survival for:
- early stage is 70–90%
- stage II is 30–40 %
- stage III is 10–30 %
For stage IV, the average survival is about 6 months.
Prognostic factors of importance:
- degree of surgical radicality (R-stage)
- degree of tumor infiltration (T-stage)
- lymph node status (N-stage)
- occurrence of metastasis (M-stage)
Raised serological markers CEA and CA 19–9 may be prognostic negatives.
Reporting of oncogenes or other biological markers currently do not have any practical impact.
Five-year relative survival for patients with stomach cancer, in percent, during the diagnosis period 1974–2013.
Source: Cancer Registry of Norway