To determine whether or not ULMW-HA-triggered inhibition of thymidine uptake is also observed in other ALL cell lines, we performed similar experiments after ULMW-HA stimulation by using 10 B-precursor ALL cell lines (four Philadelphia chromosome-positive, four TCF3-PBX1 positive, two ETV6-RUNX1 positive), and five T-ALL cell lines with a variety of surface CD44 expression. This evidence concerns the gene CD44 and acute lymphoblastic leukemia.