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Transfusion affects the immune response to renal transplantation and may be associated with recurrence of various human neoplasms. Data from patients with colonic, rectal, cervical, and prostate tumours showed an association between transfusion of any amount of whole blood or larger amounts of red blood cells at the time of surgery and later recurrence of cancer. Recipients of one unit of whole blood had a significantly higher incidence of recurrence (45%) than recipients of a single unit of red cells (12%) (p = 0.03). Recipients of two units of whole blood also had a higher rate of recurrence (52%) than those receiving two units of red cells (23%) (p = 0.03). Recipients of any amount of whole blood had similar recurrence rates (38-52%). Recipients of four or more units of red blood cells had a higher rate of recurrence (55%) than those receiving three or fewer units of red blood cells (20%) (p = 0.005). Mortality due …