GOETHE UNIVERSITY FRANKFURT IMAGE: BONE MARROW SMEAR FROM A CHILD WITH DOWN SYNDROME WHO SUFFERS FROM LEUKEMIA. THE PURPLE-COLOURED LEUKEMIC BLASTS DISPLACE NORMAL BLOOD FORMATION. CREDIT: JAN KLUSMANN, UNIVERSITY HOSPITAL FRANKFURT FRANKFURT. Leukaemia (blood cancer) is a group of malignant and aggressive diseases of the blood-forming cells in the bone marrow. Very intensive chemotherapy and...