Because pancreatic cancer is usually found late, only 20 percent to 30 percent of patients are candidates for surgery. And S-1 appears to work best for Asian patients; earlier studies have found that white patients tend to suffer more severe side effects.
S-1 is currently approved in Japan and several other Asian countries, and in much of Europe. It is not approved in the United States, but is being studied here as a treatment for stomach cancer.
More information
Learn more about pancreatic cancer from the American Cancer Society.
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