Just sharing this info which I received from an NHS oncologist... I was advised to request a Micro Satellite Instability (MSI) test. It indicates whether immunotherapy would be a good option for me or not. A low result means “no” and a high result means “yes” immunotherapy would be good.

Apparently immunotherapy is licensed as a third line treatment and there is a patient access scheme for upper GI patients. Immunotherapy is free for nhs patients (subsidised by the pharmaceutical co.s) while NICE decides whether or not to support immunotherapy.

Previous biopsies of the peritoneum nodules or stomach biopsies can be used for thetest.