answer:It varies and depends on the organization. (Prior to July 21, 2003, the Red Cross’s guidelines prohibited blood donations from any cancer patients treated with chemotherapy, hormone therapy or immunotherapy, even if they were more than five years past the end of treatment. Many blood donation centers continue to adhere to the former guidelines. For example, Dana Farber will not accept blood donations from cancer survivors, regardless of the treatment methodology and the number of years since the end of treatment.) In the UK, blood donations are not accepted from cancer survivors, no matter how many years have passed since the end of treatment. Some info