I hope your dad gets better. my brother also has gastric cancer. did you ever see a children's program called "mr roger's neighborhood" ? fred rogers also had gastric cancer.
Alot of cases of gastric cancer seem to be associated with a bacteria in the stomach called Helicobacter Pylori (H. Pylori) .. your dad should be tested for it and treated it he has it. If he has it, everyone else in the family should be tested for it as well. There is a blood test and a breath test. Helicobacter Pylori is a bacteria that has been implicated in causing gastric cancer. It is not clear how H.Pylori infection is transmitted, but studies show that if one person in the family has it, there is an increased likelihood that others in the family will have it as well. Wikipedia explains it pretty well at this link:
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http://en.wikipedia.org/wiki/Helicobacter_pylori#Gastric_can although i do not think that they have a cure yet for gastric cancer, they keep improving the regimen of drugs which gives people more time. the latest regimen of drugs, which might be what your dad already got, is discussed in this link:
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http://www.cancercompass.com/cancer-news/1,9262,00.htm----- this is also what my brother is getting.
Most of the standard three drugs treatments for gastric cancer have variations of cisplatin, 5-fluorouracil, and a third drug. Taxotere is the drug they tested in the link above, and it seems to be good. It interferes with cell division. When cells divide, the chromosomes first replicate themselves. Then, microtubules pull the chromosomes apart so that there is a complete set of chromosomes at opposite poles of the cell. Taxotere helps form the network of tubules but then prevents them from being dismantled. Camptosar, mentioned in the previous reply, also looks very good. I think it is used after taxotere has been tried. Camptosar, also called irinotecan, prevents the chromosomes from successfully replicating. Normally, cells make small temporary nicks in the DNA so the DNA can twist and turn during the replication process. Camptosar makes these nicks permanent and when the DNA tries to replicate it comes apart.
I hope you and your dad have alot more time together. Best Wishes to you and your family.