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Effect of high-dose methotrexate (MTX) on children with acute lymphoblastic leukemia (ALL) with different subtypes and disease courses was investigated. A retrospective analysis of 207 children with ALL who were admitted to the People's Hospital of Pingyi County from March 2014 to June 2017 was carried out. According to the subtype of the disease, the children were divided into two groups. B-lineage group: ALL occurred in B-lineage lymphocytes (n=128); T-lineage group: ALL occurred in T-lineage lymphocytes (n=79). According to the disease course, the children were divided into three groups. High-risk group: disease course &gt;15 days (n=67); moderate-risk group: disease course &gt;8 and &lt;15 days (n=58); low-risk group: disease course &lt;8 days (n=82). The plasma concentration, calcium formyltetrahydrofolate (CF) rescue times and adverse reactions were compared at 12 h (T1), 48 h (T2), and 72 h (T3) after MTX infusion. The plasma concentration in B-lineage group was significantly higher than that in the T-lineage group at T2 and T3 (P&lt;0.05). The incidence of adverse reactions in children with ALL in the B-lineage group was significantly higher than that in the T-lineage group (P&lt;0.05). The CF rescue times in high-risk group were more than that in moderate- and low-risk groups (P&lt;0.05). The incidence of adverse reactions in the high-risk group was significantly higher than that in the moderate- and low-risk groups (P&lt;0.05), and in the moderate-risk group was significantly higher than that in the low-risk group (P&lt;0.05). Compared with T-lineage ALL children, high-dose MTX causes more toxic injury to B-lineage ALL children. During clinical application of MTX in the treatment of ALL, close attention should be paid to the changes of the vital signs of patients, and timely CF rescue should be performed.

Efficacy and association analysis of high‑dose methotrexate in the treatment of children with acute lymphoblastic leukemia