WTF ? I fired up 2 k 17 and as much as I passed to KLove , he didn ' t score 34 points . Game is so unrealistic . <| sep |> Uh . Why did you 1 Reply to me . The owner isn ' t going to see it . 2 Post it in the old one . Use the new WR or the WR website . <| sep |> There are no documented cases of this and realistically its almost impossible , but theoretically it could happen . While leukemia progenitor cells originate in the bone marrow , the daughter cells are blood cells and thus circulate . Metastasis occurs when the circulating leukemia cells travel through the blood stream to reach other tissues . However , most leukaemia cells would probably not be metastaticcapable of tissue invasion . If blood was taken when metastatic cells were circulating , they could be passed on to the recipient . However this is very unlikelyIn many countries it is now mandatory for donated blood to undergo leukocyte reductiondepletion , in which the the concentration of leukocytes is reduced to at least 1104 cellsmL . This is removal of approximately 99 % of the leukocytes . This is done to reduce harmful reactions when the nonself HLA on donated leukocytes is recognized as foreign by the recipient ' s immune system . Red blood cells do not express MHC and are thus not recognized as foreign , but you still have to match other antigens . The recipients immune cells would almost certainly recognized any leukaemia cell as foreign and eliminate it . The only way the the cancer cells could possibly survive would be if the individuals had matching HLA types , or the individual was severely immunocompromised . They ' ve studied the possibility of cancer transmission from transfusions , and there was no risk . Nonetheless , cancer patients are usually p r o d u c t d o n a t i o n a n d t r a n s f u s i o n b l o o d donationbycancersurvivors from donating blood just in case . So in short , the donor would have to have metastasis capable cells circulating , the cells would have to survive leukoreduction , and they ' d have to be given to an individual with either virtually no immune system or matching HLA .