Hi John,
of course you want to first find out what symptoms and observations are connected to that diagnosis for your client to have a starting point for the conflict pattern.
Beliefs and expectations around the diagnosis, and the fears connected with them, are a major point to treat, so basic resourcing and offering the META-Health view of understandable and on some level meaningful reactions upon stressors, as well as on resolution triggers, will help to reframe the inevitability of the connected prognosis of suffering and death.
Besides watching out for UDINs and stress triggers in his own life, you may find certain patterns in his family, which is the META-explanation of genetically inherited diseases and risk factors. So healing can be done by him on that level, too, for example with reimprinting modalities.

THis does not mean that META-Health guarantees his physical healing, but it does not exclude the possibility. Enhancing his life quality is the first aim, including finding peace within himself..

On the physical level, improvement of life quality has been reached by the cannabinoid THCA, see this discussion: [http://www.meta-health.net/tiki-view_forum_thread.php?threadId=254]
Find scientifically tested natural remedies in this article: [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3841999/]