CS>(LL) ?? Anything to use with CS/EIS during Chemo treatments

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A nice waitress, at a favorite restaurant, has a friend that  has had part 
of his stomach removed due to cancer. She was in on a conversation  at our 
table on CS / EIS. He starts chemotherapy next week & wondered if  there was 
anything that could help him in anyway. I thought the CS / EIS would  stop 
possible infection .  any other ideas would be much appreciated.   It is sad 
medical Marijuana is not legal here in the States as I know that is  very 
useful for those having chemo.... Thanks Lois.