Polymorphisms in methotrexate transporters and their relationship to plasma methotrexate levels, toxicity of high-dose methotrexate, and outcome of pediatric acute lymphoblastic leukemia

Shu-Guang Liu, Chao Gao, Rui-Dong Zhang, Xiao-Xi Zhao, Lei Cui, Wei-Jing Li, Zhen-Ping Chen, Zhi-Xia Yue, Yuan-Yuan Zhang, Min-Yuan Wu, Jian-Xiang Wang, Zhi-Gang Li, Hu-Yong Zheng, Shu-Guang Liu, Chao Gao, Rui-Dong Zhang, Xiao-Xi Zhao, Lei Cui, Wei-Jing Li, Zhen-Ping Chen, Zhi-Xia Yue, Yuan-Yuan Zhang, Min-Yuan Wu, Jian-Xiang Wang, Zhi-Gang Li, Hu-Yong Zheng

Abstract

High-dose methotrexate (HDMTX) plays an important role in the treatment of acute lymphoblastic leukemia (ALL) although there is great inter-patient variability in the efficacy and toxicity of MTX. The relationship between polymorphisms in genes encoding MTX transporters and MTX response is controversial. In the present study, 322 Chinese children with standard- and intermediate-risk ALL were genotyped for 12 polymorphisms. SLCO1B1 rs10841753 showed a significant association with plasma MTX levels at 48 h (P = 0.017). Patients who had the ABCB1 rs1128503 C allele had longer duration of hospitalization than did those with the TT genotype (P = 0.006). No association was found between oral mucositis and any polymorphism. Long-term outcome was worse in patients with the SLCO1B1 rs4149056 CC genotype than in patients with TT or TC (5-year event-free survival [EFS] 33.3 ± 19.2% vs. 90.5 ± 1.7%, P < 0.001), and was worse in patients with the SCL19A1 rs2838958 AA genotype than in patients with AG or GG (5-year EFS 78.5 ± 4.6% vs. 92.2 ± 1.8%, P = 0.008). Multiple Cox regression analyses revealed associations of minimal residual disease (MRD) at day 33 (hazard ratio 3.458; P = 0.002), MRD at day 78 (hazard ratio 6.330; P = 0.001), SLCO1B1 rs4149056 (hazard ratio 12.242; P < 0.001), and SCL19A1 rs2838958 (hazard ratio 2.324; P = 0.019) with EFS. Our findings show that polymorphisms in genes encoding MTX transporters substantially influence the kinetics and response to HDMTX therapy in childhood ALL.

Keywords: SLC19A1; SLCO1B1; acute lymphoblastic leukemia; methotrexate; polymorphism.

Conflict of interest statement

CONFLICTS OF INTEREST

None.

Figures

Figure 1. Polymorphisms and event-free survival (EFS)
Figure 1. Polymorphisms and event-free survival (EFS)
(A) The Kaplan-Meier survival curve is shown to illustrate the difference between SLCO1B1 rs4149056 CC variant and TT/TC variants (log-rank P < 0.001). (B) The Kaplan-Meier survival curve is shown to illustrate the difference between SLC19A1 rs2838958 AA variant and GG/AG variants (log-rank P = 0.008).

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