OOO is a valid therapy - I made some using my medical grade ozonator and the olive oil holds the ozone for a long time (months) -
there are many immune/cancer herbs/spices the ones at the top of my head are graviola, bitter melon, turmeric.
Adequate magnesium and selenium are vital components of immune system health as well as glutathione boosters or cysteine which enable the immune system to run