Hi
Was the carcinoma purely signet ring cell - or was it mixed with other types of cancer cells?
The reason for my question is that I have a rare form of bladder cancer - urachal adenocarcinoma - when pathology came back it was mixed with signet ring cells - I was told that the signet ring cells are more typical of stomach cancer.
I totally agree with you we are not statistics - not sure where you are based but the Chrisitie Hospital Manchester is one the the centres of excellence in treating all kinds of cancers - maybe they would be able to assist your Mother. If you live in the USA maybe the MD Anderson Cancer Centre in Texas will have the information you seek - they too deal with all kinds of bladder cancer.
My own story is not good so I won't share my experience - your Mum is fortunate to have a daughter that cares and is willing to do the research to find a way forward - and the gold standard of care in most types of bladder cancer is to seek an operational cure.
Another webiste you may wish to check out to broaden your search for someone with exact experience is
http://www.inspire.com/groups/bladder-cancer-advocacy-networ
hope some of this helps - sending e-hugs of emapthy
dixie