Curcumin seems to have many positive effects for cancer patients and is evaluated in more trials every year. As you wrote none of the drugs seem to have toxic effects. Curcumin is an iron chelator and that is often positive for MDS patients. Then it can decrease blood clotting but that is no problem for you if your platelets are OK.
You could contact the clinic and ask for info: http://www.umassmed.edu/Content.aspx?id=78804#clinical
Many patients take curcumin and/or gingerol without participating in a trial. Remember to choose curcumin combined with black pepper since that drug will have better effect.