肾移植中环孢素的血药浓度与多药耐药基因多态性的关系

目的 探讨肾移植术后患者的MDR1C3435T、G2677T/A和C1236T位点的基因多态性对环孢素(CsA)血药浓度的影响.方法 使用荧光偏振免疫分析法(AxsYM)测定65例肾移植患者在术后1 wk和1 mo时的CsA血药浓度(包括峰浓度ρ2和谷浓度ρ0),使用等位基因特异扩增法(ASA-PCR)对患者进行MDR1基因分型,比较不同基因型之间CsA浓度剂量比的差异.结果 在65例患者中,C3435T,CC型25例(38.5%),CT型35例(53.8%),TT型5例(7.7%);G2677T/A,GG型15例(23.1%),GT型21例(32.3%),TT型10例(15.4%),GA型12例(18.5%),AT型6例(9.2%),AA型1例(1.5%);C1236T,CC型10例(15.4%),CT型32例(49.2%),TT型23例(35.4%).C3435T的CT型患者的CsA浓度剂量比略大于CC型和TT型;G2677T/A的从型患者的CsA浓度剂量比略大于其他基因型;C1236T的TT型患者的谷浓度剂量比略大于CC型和CT型,CC型患者的峰浓度剂量比略大于CT型和TT型,但差异均无统计学意义(P＞0.05).结论 在肾移植患者中,MDR1多态性与CsA血药浓度无明显相关性,有待进一步确认.     

肝移植中他克莫司的血药浓度与多药耐药基因多态性的关系

目的探讨肝移植术后患者的多药耐药基因（MDR1）C3435T、G2677T／A和C1236T位点的基因多态性对他克莫司（F1〈506）血药浓度的影响。方法使用荧光偏振免疫分析法（AxSYM）测定42例肝移植患者在术后1周和1个月时FK506的血药浓度,使用等位基因特异扩增法（ASA-PCR）对患者进行MDR1基因分型,比较不同基因型之间FK506的浓度／剂量比的差异。结果在42例患者中,C3435T中CC型16例（38．1％）,CT型23例（54．8％）,TT型3例（7．1％）;G2677T／A中CA;型4例（9．5％）,GT型13例（31．O％）,TT型8例（19．0％）,GA型7例（16．7％）,AT型10例（23．8％）;C1236T中CC型6例（14．3％）,CT型19例（45．2％）,TT型17例（40．5％）。根据移植术后第1周和第1个月的记录,在C1236T中CC型患者的浓度／剂量比小于CT型和TT型,且差异有统计学意义（P〈0．05）。在C3435T和G2677T／A中不同基因型之间的浓度／剂量比的差异无统计学意义（P〉0．05）。结论在肝移植患者中MDR1多态性与FK506血药浓度具有相关性,C1236TCC型患者拟取得相似的血药浓度要比CT型和TT型患者服用更高剂量的FK506。     

MDR1C1236T基因多态性对环孢素药代动力学影响的系统评价

目的 系统评价MDR1C1236T基因多态性与环孢素(免疫抑制剂)药代动力学的相关性.方法 计算机检索相关数据库,收集MDR1C1236T基因多态性与环孢素药代动力学的相关性研究.用Revman 5.0软件对符合纳入标准的研究进行荟萃分析.结果 共纳入7篇回顾性研究(n=605).分析显示,CC基因型患者给药后2 h,剂量调整浓度明显低于其他基因型;但仅与TT基因型组有统计学差异(P＜0.05),剂量调整谷浓度及平均日剂量与其他基因型问均无统计学差异.结论 MDRI C1236T基因多态性对环孢素给药后2 h剂量调整浓度有一定影响.     

MDR1 C3435T基因多态性与肾移植患者他克莫司血药浓度关系的Meta分析

目的:系统评价多药耐药基因1(MDR1)C3435T基因多态性与肾移植患者他克莫司(FK506)血药浓度的关系,为器官移植术后免疫抑制剂的精准化治疗提供循证参考。方法:计算机检索数据库Embase、Science Direct、Pubmed、CNKI、Wan fang、Conchrane,Clinicaltrials.gov,检索年限为1990年1月至2016年10月,检索语种为中文和英文,收集有关MDR1C3435T基因多态性与肾移植患者FK506血药浓度关系的研究。对纳入的研究进行资料提取与质量评价。用Cochrane提供Revman 5.3软件进行Meta分析。结果:有8项研究纳入此次Meta分析,共827例患者。Meta分析结果显示,MDR1C3435T基因型中CT型患者在肾移植术后1周[MD=-16.93,95%CI(-27.67,-6.19),P=0.002]、1月[MD=-18.09,95%CI(-26.41,-9.78),P<0.0001]、6月[MD=-15.52,95%CI(-25.18,-5.85),P=0.002]时,血药浓度高于同期CC型患者;TT型患者在肾移植术后1周[MD=-30.76,95%CI(-53.04,-8.48),P=0.007]、1月[MD=-25.92,95%CI(-48.34,-3.51),P=0.02]、3月[MD=-33.77,95%CI(-48.74,-18.80),P <0.00001]、6月[MD=-22.25,95%CI(-32.97,-11.53),P<0.0001]、12月[MD=-22.74,95%CI(-42.76,-2.72),P=0.03]时,血药浓度高于同期CC型患者;TT型患者在肾移植术后3月[MD=-18.81,95%CI(-34.30,-3.33),P=0.002]时,血药浓度高于同期CT型患者。结论:MDR1C3435T基因多态性与FK506血药浓度/剂量存在相关性,且血药浓度的关系是携带者(CT型或者TT型)>非携带者(CC型)。在肾移植术后不同时期内,根据MDR1C3435T基因多态性与FK506血药浓度/剂量存在的相关性,做基因检测可以在短时间内达到有效血药浓度。由于纳入研究数量较少、样本量不大、该结论有待大样本、高质量研究进一步证实。     

多药耐药基因MDR1 C3435T基因多态性对质子泵抑制剂三联方案根除幽门螺杆菌疗效影响的Meta分析

目的:系统评价多药耐药基因MDR1 C3435T基因多态性与质子泵抑制剂三联方案根除幽门螺杆菌疗效的关系,为临床提供循证参考。方法:计算机检索Pub Med、EMBase、中国生物医学文献数据库(CBM)、中国期刊全文数据库(CJFD)、万方数据库、中文科技期刊数据库(VIP),收集MDR1 C3435T基因多态性对质子泵抑制剂三联方案根除幽门螺杆菌感染疗效的临床研究,提取资料并按照STREGA声明评价质量,采用Rev Man 5.3统计软件进行Meta分析。结果:共纳入7项研究,合计1 019例患者。按照患者MDR1 C3435T基因型检测结果分为野生纯合子基因(CC)型组,突变杂合子基因(CT)型组与突变纯合子基因(TT)型组。Meta分析结果显示,MDR1 C3435T基因多态性中CC组、CT组与TT组患者幽门螺杆菌根除率比较,差异均无统计学意义[CC vs.CT:OR=0.99,95%CI(0.69,1.42),P=0.95;CC vs.TT:OR=1.44,95%CI(0.66,3.15),P=0.36;CT vs.TT:OR=1.54,95%CI(0.86,2.73),P=0.14];亚组分析发现,亚洲人群中CT组患者幽门螺杆菌根除率显著高于TT组,差异有统计学意义[OR=2.35,95%CI(1.53,3.62),P<0.001]。结论:MDR1 C3435T基因多态性基本不影响质子泵抑制剂三联方案根除幽门螺杆菌的疗效,但亚洲人群进行治疗时,参考基因检测结果有一定意义。     

多药耐药基因1 C3435T多态性与急性淋巴细胞白血病患儿甲氨蝶呤血清浓度的关系

目的考察多药耐药基因1(MDR1)C3435T多态性与急性淋巴细胞白血病(ALL)患儿甲氨蝶呤(MTX)血清浓度及化疗毒性的相关性。方法收集100例ALL患儿外周血,提取基因组DNA;用PCR-RFLP法,检测MDR1 C3435T基因型;用荧光偏振免疫法(FPIA),测定MTX血清浓度,同时观察化疗的疗效和毒性。结果 CC、CT和TT基因型的分布频率分别为33%,53%,14%;C和T等位基因的分布频率分别为59.5%和40.5%。肝功能异常ALL患儿,其24,42h MTX剂量校正的血清浓度(C/D比值)高于肝功能正常者;携带野生基因型(CC)ALL患儿的24,42 h MTX C/D比值高于突变基因型(CT+TT)携带者;携带野生基因型ALL患儿的未缓解、化疗毒性和排泄延迟发生率,高于突变基因型携带者。由于个体间的变异大,上述差异均无统计学意义(P>0.05)。结论多种因素影响MTX的药代与药效,MDR1 C3435T多态性与ALL患儿的MTX血清浓度和化疗毒性无显著相关关系。     

骨肉瘤患者3种基因多态性与大剂量甲氨蝶呤不良反应相关性的Meta分析

目的:系统评价骨肉瘤患者亚甲基四氢叶酸还原酶(MTHFR)、还原性叶酸载体1(RFC1)、多药耐药基因1(MDR1)基因多态性对大剂量甲氨蝶呤不良反应的影响,为大剂量甲氨蝶呤临床个体化用药提供循证参考。方法:计算机检索Medline、Embase、clinical trials.gov、中国知网、万方数据和中国生物医学文献数据库,收集MTHFR C677T/A1298C、RFC1 G80A、MDR1 C3435T不同基因多态性与大剂量甲氨蝶呤不良反应相关性的队列研究,对符合纳入标准的临床研究进行资料提取后,采用纽卡斯尔-渥太华量表进行质量评价后,采用Rev Man 5.3、Microsoft Excel 2016对大剂量甲氨蝶呤相关不良反应(血液毒性与骨髓抑制、肝毒性、肾毒性、口腔黏膜炎、消化道毒性、整体不良事件)发生率等结局指标进行Meta分析与描述性分析。结果:共纳入8项队列研究,合计608例患者。报告MTHFR C677T、MTHFR A1298C、RFC1 G80A、MDR1 C3435T多态性相关的结局指标分别有6、5、4、2项。Meta分析与描述性分析结果表明,MTHFR C677T多态性与G3-4腎毒性[TT/CT vs.CC:OR=12.35,95%CI(3.28,46.42),P<0.001]、G3-4口腔黏膜炎[T vs.C:OR=2.04,95%CI(1.06,3.93),P=0.03]、口腔黏膜炎[TT vs.CT/CC:OR=2.27,95%CI(1.20,4.27),P=0.01]、肾毒性(P<0.05)的发生风险显著相关;MTHFR A1298C多态性与G3-4肝毒性、G3-4肾毒性、G3-4口腔黏膜炎有关,但均无显著相关性(P>0.05);RFC1 G80A多态性与血液毒性、肝毒性、肾毒性、消化道毒性均无显著相关性(P>0.05);MDR1C3435T多态性与口腔黏膜炎有显著相关性(P<0.05),与血液毒性、肝毒性均无显著相关性(P>0.05)。结论:MTHFR C677T突变可能导致大剂量甲氨蝶呤不良反应发生风险增加,MTHFR A1298C多态性与大剂量甲氨蝶呤不良反应无显著相关性,RFC1 G80A或MDR1 C3435T多态性与大剂量甲氨蝶呤不良反应的研究较少,相关性尚不明确。     

MDR1基因多态性对口服环孢素A药代动力学的影响

目的非线性混合效应模型(NONMEM)考察中国健康人多药耐药基因(MDR1)中26外显子的C3435T多态性与环孢素A (CsA)药代动力学特性间的关系。方法HPLC法测定20名健康男性单次口服CsA微乳溶液制剂500 mg后24 h内不同时间点的药物浓度。MDR1的基因多态性测定采用DNA限制性片段长度多态性法，并用基因测序法验证。数据处理与模型拟合采用NONMEM法。结果中国健康人中含MDR1 C3435T CC或CT型的相对生物利用度较TT型高40%。结论MDR1中C3435T多态性是个体间CsA相对生物利用度差异的影响因素。     

POR基因多态性与华法林维持剂量关系的研究

目的探讨POR基因多态性与华法林维持剂量的相关性。方法共纳入185例中国汉族人工心脏机械瓣膜置换术患者,采用Sequenom MassARRAYSystem检测VKORC1及POR相关SNPs,采用PCR-RFLP法检测CYP2C9*3基因型。采用ANOVA或t检验考察目的 SNPs与患者华法林维持剂量的关系。结果在CYP2C9*1*1携带者中,POR rs17685 T等位基因携带者(TT型和CT型)华法林维持剂量明显高于CC型携带者(3.50±1.07)mg·d-1vs(3.14±0.94)mg·d-1,P=0.03。在CYP2C9*1*1及VKORC1 rs9934438 GA/GG携带者中,POR rs17685 T等位基因携带者(TT型和CT型)的华法林维持剂量明显高于CC型携带者(4.76±0.90)mg·d-1vs(4.08±1.03)mg·d-1,P=0.04。未发现POR rs2868177与华法林维持剂量存在相关性。结论在中国汉族人工心脏机械瓣膜置换术患者中,POR rs17685 T突变与华法林剂量上调相关,该基因型检测将有助于指导华法林的临床合理应用。     

MDR1C3435T基因多态性与芬太尼术后镇痛效应的关系

目的探索MDR1C3435T基因多态性与芬太尼术后镇痛效应的关系。方法术后随访患者并记录芬太尼镇痛使用量及不良反应发生情况,采用聚合酶链反应一限制性片段长度多态性（eCR-RFLP）技术对129例患者进行基因分型,比较不同基因型间芬太尼镇痛效应的差异。结果129例患者中、CC型51例（39．5％）、CT型57例（44．2％）、111型21例（16．3％）。CT型、TT型患者24h芬太尼镇痛使用量显著低于CC型（P〈0．05）,TT型患者48h芬太尼镇痛使用量显著低于CC型（P〈0．05）,CT型与CC型48h芬太尼镇痛量、不同基因型组间不良反应发生率差异无统计学意义。结论MDR1C3435T与术后不良反应无相关性,但与芬太尼术后镇痛使用量具有相关性,该基因型可能成为疼痛个体化治疗的参考指标。     

MDR1 (ABCB1) gene polymorphism C3435T is associated with P-glycoprotein activity in B-cell chronic lymphocytic leukemia

Functional single nucleotide polymorphism (SNP) C3435T in exon 26 of the MDR1 ( ABCB1 ) gene encoding the xenobiotic transporter P-glycoprotein (P-gp, MDR1, ABCB1) may influence susceptibility to several diseases as well as clinical outcome of treatment with P-gp substrates. Exposure to environmental chemicals is thought to be involved in the pathogenesis of B-cell chronic lymphocytic leukemia (B-CLL) and P-gp-transported drugs are used in its treatment; however, little is known about the impact of the C3435T MDR1 SNP in B-CLL. In this study, 110 Caucasian B-CLL patients and 201 healthy controls were genotyped for the MDR1 C3435T SNP. Additionally, P-gp activity was assessed in malignant lymphocytes of 22 untreated B-CLL patients. We observed a higher frequency of carriers of at least one 3435T allele (3435CT and 3435TT genotypes) among B-CLL patients as compared to normal individuals (76% vs . 63%, p=0.027). The genotypes 3435CT and 3435TT were associated with B-CLL, (odds ratio=1.8, 95% confidence interval = 1.1-3.0). Moreover, P-gp activity in B-CLL cells depended on MDR1 genotype, with the highest P-gp activity in 3435CC homozygotes, intermediate in 3435CT heterozygotes and the lowest in 3435TT homozygotes (p=0.042). P-gp activity was also significantly lower in carriers of the T-allele (3435CT/TT genotype) as compared to the non-carriers (3435CC genotype), (p=0.029). Taken together, these data indicate that the MDR1 C3435T SNP may carry an increased risk of developing B-CLL, possibly by virtue of decreased protection against P-gp-substrate carcinogens. The differences in P-gp activity in B-CLL tumor cells related to MDR1 genotype may have implications to the response to chemotherapy with P-gp transported anticancer agents.     

Does maternal MDR1 C1236T polymorphism have an effect on placental arsenic levels?

To detect whether maternal MDR1 C1236T polymorphism has an effect on placental arsenic levels, 112 mother–placenta pairs were examined. Venous blood samples from mothers were collected to investigate the C1236T polymorphism which was detected by standard PCR–RFLP technique. Placentas were collected to measure arsenic levels by GF-AAS. The MDR1 C1236T genotype frequencies of mothers were found as 30.3% homozygote typical (CC), 51.8% heterozygote (CT) and 17.9% homozygote atypical (TT). The mean placental arsenic level was 62.36 ± 30.43 μg/kg. It was observed that the placental arsenic concentrations were higher in mothers with TT genotype than those with CC and CT genotypes, but this was not statistically significant (p = 0.702). This finding was indicated that fetuses of mothers with TT genotype may be more susceptible to arsenic toxicity as compared to those of with CC and CT genotypes. We believe that this difference warrant further studies with larger study subjects.     

C1236T、 G2677T/A 和C3435T 基因多态性与乳腺癌分子分型的关系及意义

摘要： 目的 观察多药耐药基因 1 （MDR1） 第 12、 21 及 26 外显子 C1236T、 G2677T/A 和 C3435T 基因多态性在乳腺癌患者外周血中的分布, 分析其与分子分型的关系。方法 应用高分辨熔解曲线 （HRM） 技术检测 400 例乳腺癌患者 C1236T、 G2677T/A 及 C3435T 基因多态性。采用 Hardy-Weinberg 遗传平衡检验进行基因型分布遗传平衡吻合度检验。参照 2013 年 St.Gallen 国际专家乳腺癌分子分型共识。分析乳腺癌患者中 C1236T、 G2677T/A 和 C3435T 基因型分布特点, 并探讨其与分子分型的关系。结果 （1）400 例乳腺癌患者中 C1236T、 G2677T/A 和 C3435T 中分别有 2 例、 3 例和 2 例标本未得出基因分型结果, C1236T 位点 CC、 CT 和 TT 基因型分别占 16.08% （64/398）、 44.22% （176/398） 和 39.70% （158/398）; G2677T/A 位点 GG、 GT、 GA、 TT 和 AT 基因型分别占 16.62% （66/397）、 44.33% （176/ 397）、 7.05% （28/397）、 27.46% （109/397） 和 4.54% （18/397）; C3435T 位点 CC、 CT 和 TT 基因型分别占 21.11% （84/ 398）、 56.03% （223/398） 和 22.86% （91/398）。经 Hardy-Weinberg 遗传平衡检验, 认为 C1236T、 G2677T/A 和 C3435T 基因多态性具有群体代表性 （P > 0.05）。（2） 分子分型显示, 11例人类表皮生长因子受体2 （HER-2, 2+） 患者未行荧光原位杂交 （FISH） 检测予以剔除, 其中Luminal A型占41.90% （163/389）, Luminal B型占32.65% （127/389）, HER-2过表达型占13.62% （53/389）, 三阴型占11.83% （46/389）。（3） C3435T位点CT/TT基因型在Luminal A型患者中的频率高于其在HER-2过表达型和三阴型患者中的频率 （χ2 =12.011, P=0.001; χ2 =13.976, P < 0.001）, C1236T和G2677T/A基因多态性在不同分子分型中的分布差异无统计学意义 （P > 0.05）。结论 MDR1基因C3435T位点多态性可以为乳腺癌异质性提供更合理的补充, 不同乳腺癌分子分型患者中CT/TT基因表型可能对药物治疗更敏感。     

Pharmacogenomic studies of the anticancer and immunosuppressive thiopurines mercaptopurine and azathioprine

AIMS

To examine the allelic variation of three enzymes involved in 6-mercaptopurine/azathioprine (6-MP/AZA) metabolism and evaluate the influence of these polymorphisms on toxicity, haematological parameters and metabolite levels in patients with acute lymphoblastic leukaemia (ALL) or inflammatory bowel disease (IBD).

METHODS

Clinical data and blood samples were collected from 19 ALL paediatric patients and 35 IBD patients who were receiving 6-MP/AZA therapy. All patients were screened for seven genetic polymorphisms in three enzymes involved in mercaptopurine metabolism [xanthine oxidase, inosine triphosphatase (C94→A and IVS2+21A→C) and thiopurine methyltransferase]. Erythrocyte and plasma metabolite concentrations were also determined. The associations between the various genotypes and myelotoxicity, haematological parameters and metabolite concentrations were determined.

RESULTS

Thiopurine methyltransferase variant alleles were associated with a preferential metabolism away from 6-methylmercaptopurine nucleotides (P = 0.008 in ALL patients, P = 0.038 in IBD patients) favouring 6-thioguanine nucleotides (6-TGNs) (P = 0.021 in ALL patients). Interestingly, carriers of inosine triphosphatase IVS2+21A→C variants among ALL and IBD patients had significantly higher concentrations of the active cytotoxic metabolites, 6-TGNs (P = 0.008 in ALL patients, P = 0.047 in IBD patients). The study confirmed the association of thiopurine methyltransferaseheterozygosity with leucopenia and neutropenia in ALL patients and reported a significant association between inosine triphosphatase IVS2+21A→C variants with thrombocytopenia (P = 0.012).

CONCLUSIONS

Pharmacogenetic polymorphisms in the 6-MP pathway may help identify patients at risk for associated toxicities and may serve as a guide for dose individualization.

WHAT IS ALREADY KNOWN ABOUT THIS SUBJECT

• 6-Mercaptopurine (6-MP) and azathioprine (AZA) are both inactive prodrugs that require intracellular activation into the active 6-thioguanine nucleotides (6-TGNs).
• This metabolic process undergoes three different competitive pathways that are catalysed by three different enzymes; xanthine oxidase (XO), thiopurine methyltransferase (TPMT) and inosine triphosphatase (ITPA), all of which exhibit genetic polymorphisms.
• Although the impact of genetic variation in the TPMT gene on treatment outcome and toxicity has been demonstrated, the role of other polymorphisms remains less well known.

WHAT THIS STUDY ADDS

• New information on the allelic variation of these three enzymes (XO, TPMT and ITPA) and their influence on 6-MP/AZA metabolism and toxicity.
• Confirmation of the association of TPMT polymorphism with haematological toxicity.
• Identified potential genetic characteristics that may contribute to higher risk of adverse events (such as ITPA IVS2+21A→C mutation).

     

Frequency of the C1236T, G2677T/A and C3435T MDR1 gene polymorphisms in the Serbian population

The multi-drug resistance 1 (MDR1) gene encodes for a P-glycoprotein (PGP), which acts as a gate-keeper against various kinds of xenobiotics. Several single nucleotide polymorphisms (SNPs) in the MDR1 gene that may influence PGP level and function have been identified. The aim of this study was to simultaneously analyze the three most important MDR1 SNPs, C3435T, G2677T/A and C1236T, in the Serbian population and to compare the results with those published for other ethnic groups. A group of 158 unrelated, healthy subjects was included in the present study. For determination of MDR1 SNPs, a multiplexed mutagenically separated PCR was performed. The genotype frequency of the analyzed MDR1 SNPs was as follows: 3435 nt - 0.19 (CC), 0.54 (CT) and 0.27 (TT); 2677 nt - 0.26 (GG), 0.52 (GT), 0.15 (TT), 0.03 (GA) and 0.064 (TA), and 1236 nt - 0.23 (CC), 0.61 (CT) and 0.16 (TT). Our results for the Serbian population could be relevant for further investigation of drugs that are substrates of PGPand for studies of interethnic diversity in MDR1 polymorphism frequency.     

ABCB1基因多态性与非霍奇金淋巴瘤患者甲氨蝶呤毒副反应关系研究

目的：研究多药耐药基因1（ABCB1）rs1045642基因多态性与非霍奇金淋巴瘤（NHL）患者甲氨蝶呤（MTX）毒副反应关系。方法：收集81例使用大剂量MTX化疗的NHL患者血样,应用直接测序法检测ABCB1 rs1045642基因多态性,根据NCI-CTCAE统一评价MTX化疗后的毒副反应,用SPSS分析基因多态性与MTX毒副反应的关系。结果：CC、CT和TT基因的分布频率分别为43.21%、39.51%和17.28%;C和T等位基因的分布频率为62.96%和37.04%;突变型（CT+TT）患者发生2级以上血小板减少的比例显著高于野生型（CC）患者（P=0.002）。结论：ABCB1 rs1045642基因多态性可能影响NHL患者MTX化疗后2级以上血小板减少的发生率。     

ABCB1基因多态性对卡马西平血药浓度的影响

目的:探讨ABCB1基因多态性对卡马西平血药浓度的影响。方法:采用荧光偏振免疫法(FPIA)测定275例口服卡马西平癫痫患者的血药浓度,聚合酶链式反应-限制性片段长度多态性方法(PCR-RFLP)或直接测序法检测ABCB1多态性位点C1236T、G2677T/A和C3435T的基因型。单因素方差分析计算各SNP位点不同基因型对应的卡马西平血药浓度是否有差异。结果:G2677T/A不同基因型对应的调整后血药浓度均值之间差别有显著性,TT基因型对应的调整后血药浓度显著高于GG型(P=0.001)。C1236T、C3435T各基因型对应的调整后血药浓度均值差别无统计学意义(P>0.05)。结论:ABCB1基因SNP位点G2677T/A的基因多态性对口服卡马西平癫痫患者的血药浓度有影响,提示TT基因型的患者可适当减少药物使用剂量。