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are uncommon tumors and ompared to common cancer of pancreas-adenocarcinoma ,they have relatively slower course and better outcome.
It is unfortunate that your mother has aggressive type of tumor because she developed metastasis in relatively short time.
Most appropriate treatment of hepatic metastasis
for lung term survival is surgery. But since her tumor in not operable she should undergo chemotherapy
with frequent assessment in between to see if tumor shrinks and becomes operable.
Although it is difficult to quantify her life because every person has different disease course, statistically survival in patients with hepatic metastases is 2–4 years.