Dear EPeter,
Sorry to hear about your Dad joining this very exclusive club (yes, gallows humor will help get you through this). My partner Rick has been battling with stage IV, inoperable gastric cancer (adenocarcinoma) for two years now. We are now of the opinion after watching all of the info posted on this site (and this is only our opinions, not being doctors), that the longest lasting people with this disease still have their stomachs intact. I believe that it is much easier to digest food and maintain a fighting weight with a stomach.
Like your Dad, Rick was scheduled for a total gastrectomy in March 2007, they performed a laproscopic look around first and found what we like to call floating cotton seeds blowing all around the peritoneum cavity (we have cottonwood trees here in Colorado) that were not visible on any of the CT scans (the cancer had penetrated all of the layers but had not metastisized to any other organs). At that point, our surgeon decided to install a G-tube and close him back up with his stomach still intact. We are now very thankful for his decision.
Since starting chemo in April 2007, he has had 33 chemo treatments and was able to very quickly put back on thirty pounds due to being able to eat again. While I think we are starting to see some signs of cumulative chemotherapy side effects, now on his second regimen, his quality of life has been excellent.
I hope this has at least partially answered your question. I know there is a lot of horror stories out there, but attitude and support systems and faith go a long way to fighting this battle. There are a couple of long term stomach cancer fighters posting on this board and I am sure there are others that are out there that don't post here.
As questions come up, please feel free to ask as there are lots of answers available here from people who have gone done this road ahead of you. You know, only dumb questions are the ones you don't ask.........
Hang in there and give our best wishes to your family and especially your Dad. He can beat this devil back down.
Respectfully, Scott.