Higher expression of the MTX influx transporter SLC19A1 has been correlated with favorable MTXPG accumulation in certain ALL subtypes, such as BCR‐ABL‐like and hyperdiploid ALL, while others exhibited lower SLC19A1 expression and reduced MTXPG intracellular accumulation [19]. The gene discussed is SLC19A1; the disease is acute lymphoblastic leukemia.