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The Influence of GSTA1 Polymorphism to the Response to Intravenous Cyclophosphamide Therapy in the Lupus Nephritis Patients

Hong-Na Wang, Xiao-Ye Zhu, Ying Zhu, Miao Zhao, Yuan-Cheng Chen, Jun Xue, Chuan-Ming Hao, Yong Gu, Shan-Yan Lin

Variations of clinical response of cyclophosphamide (CTX) treatment in lupus nephritis (LN) could still be recognized. LN patients with a GSTA1mutation (CT heterozygous) had a risk of none-response (P=0.005). Pharmacokinetics data indicated that patients with a GSTA1 heterozygous variant had a lower exposure to 4-OHCTX compared to wild-type patients (P=0.023). And clinical efficacy was significantly related to higher exposure to 4- OH-CTX (P=0.038). In conclusion, LN patients with GSTA1 heterozygousgenotypes had poor CTX treatment response due to less exposure to activated 4-OH-CTX.