HYDERABAD: In the report with the headline ‘Boy with Leukemia needs donors’ published in these columns on October 30, it was erroneously stated that leukemia is a disease that attacks the production of red blood cells. It is actually a group of malignant disorder of haemopoietic tissue cells (all the three cells of blood – red, white and platelets) associated with increased number of blast cells in the bone marrow.