In some sort of cancer even in stage 4 cancer there is chance of complete cure. But unfortunately pancreatic cancer is not of those category. Stage 4 disease has guarded prognosis. Now some more information will be helpful like his liver
function test, no. of liver metastasis, routine blood test
to have a more elaborate discussion. Anyway size of primary in pancreas
matters little in the setting of metastatic disease. Consult your doctor.