For leukemia the ribbon could be orange and/or green. but more commonly orange. Leukemia is a blood/bone marrow cancer effecting the white blood cells. Most forms are more common in children, but those kinds can show in adults, and the ones more commonly found in adults can be in children. There's chronic and acute leukemia's, which chronic means slow progressing, and acute means quickly/agreesivly progressing, however in chronic leukemia's at a certain point it will become as agressive as an acute leukemia. Generally chemotherapy is used to treat it, and if needed, a bone marrow transplant, but those are risky, and don't always work (chemo doesn't always work either).