1.   In the event of a match, donated marrow is extracted in a surgical procedure.

2.   The idea behind the method is to treat the donated marrow in two ways to make it more likely to successfully engraft.

3.   The second strategy is to greatly increase the number of blood progenitor cells, called stem cells, in the donated marrow.

4.   To reduce the incidence of the complication, transplant doctors removed T cells from donated marrow before giving it to patients to reduce the incidence of the complication.

5.   Instead, there was a dramatic increase in rejection of donated marrow and cancer relapse.

6.   Instead, there was an increase in rejection of donated marrow and cancer relapse compared with patients undergoing regular bone-marrow transplants, the newspaper said.

7.   It is based on giving patients much larger than usual doses of donated marrow.

8.   Martinez, who arrived at a hospital in the Mexico City suburb of Los Lomos too sick to receive the donated marrow, died Sunday night.