This is a complex but informative review on the impact of polyunsaturated fats chemotherapy and radiation.
DHA leads to higher levels of oxidation by the mitchondria.
Fish oil seems to assist a number of treatments.
It is very complicated, much is unknown, but this is a useful article that you could show to your advisers if the omega threes and sixes are of interest.
Dietary Polyunsaturated Fatty Acids; Impact on Cancer Chemotherapy and Radiation. K A Conklin
http://www.thorne.com/media/essential_fatty_acids.pdf
RB