It is difficult to provide an accurate answer to this question, as much depends on the individual's overall health and the stage of cancer at the time of diagnosis. Generally, the outlook for stomach cancer is not good, as the five-year survival rate is only 28%, according to the American Cancer Society.
However, if caught early and treated with surgery, chemotherapy, and radiation, the prognosis can be much better. For instance, if the cancer is found while it is still confined to the lining of the stomach, the five-year survival rate can rise to 60%.
Age also plays a role in the prognosis, as younger patients tend to fare better than older patients. For instance, someone in their 40s diagnosed with early-stage stomach cancer may have a five-year survival rate of around 70%. On the other hand, someone in their 70s diagnosed with advanced stomach cancer may have a five-year survival rate of only 10%.
The overall prognosis and longevity of a person with stomach cancer will depend on a variety of factors, including the stage and location of the cancer, the person's overall health, and any other medical conditions they may have. It is important to discuss your specific situation with your doctor to get an accurate estimate of your prognosis.