signet ring adenocarcinoma - specialists

Hi all,

I am looking to help my sister has signet ring adenocarcinoma, stage 3A. We are looking for doctor in US or UK who specializes in this specific cancer.

Also, looking to see know what treatments she can have post regular 5FU etc. she could not take more than 4 sessions due to reoccuring abscess in the abdomen.

thank you all,