I ran across some info on limonene as a possible interesting supplement. Jarrows sells it in supplement form at vitacost. Here is the title of the article and the link:
"d-Limonene sensitizes docetaxel-induced cytotoxicity in human prostate cancer cells: Generation of reactive oxygen species and induction of apoptosis"
Hope this proves helpful or at least interesting,
P.S. I also found that it reduces inflammation and increases p53.