Tumors and their treatment can weaken the body's immune system by affecting the blood cells that protect us against disease and germs. [American Cancer Society, 2014] When this happens to an individual with perpetual tumor growth, a low immune system will be a constant issue, which would be seen as the wrong proportion of white to red blood cells.
Vitamins and food management can help raise the immune system.
It could be as simple as finding the right amount of Vitamin B12 for you since Vitamin B12 is required for proper red blood cell formation, and would also be helpful for neurological function. [National Institute of Health, 2011] With tumors and neurological issues it is hard to get the right amount in food alone.
Food management is not about just foods to eat, but how it is cleaned and handles to minimize germs, prevent cross-contamination, how well food should be cooked, temperatures it should remain at and where not to eat certain foods from.