Effect of CYP3A4/5, ABCB1 gene polymorphisms on the residual equilibrium concentration of apixaban and bleeding in patients with non-valvular atrial fibrillation and deep vein thrombosis

Aim . The aim of our study was to investigate the influence of polymorphic markers of CYP3A4*22 CYP3A4*22 ( c.522-191C>T, rs35599367 ), CYP3A5*3 ( c.219 237A>G, rs776746 ), ABCB1 rs1045642 ( c.3435T>C ) and rs4148738 ( c.2692-2236C>T ) genes on the plasma concentration of apixaban, on changes in prothrombin time (PT), activated partial thromboplastin time (APTT), and bleeding development in patients taking apixaban. Material and methods. The study included 108 patients with non-valvular atrial fibrillation and deep vein thrombosis receiving apixaban in therapeutic doses. Genotyping was performed by real-time polymerase chain reaction. Apixaban concentrations were measured using an electrospray ionization mass spectrometer in positive ionization mode. Because the daily dose of apixaban was different (5, 10, and 20 mg daily), the residual equilibrium concentration (Cmin,ss) of apixaban was adjusted relative to the daily drug dose (Cmin,ss/D). PT and APTT were determined using an automatic coagulometer analyzer Destiny Max (Tcoag, Ireland). Statistical processing was performed in SPSS Statistics 20.0 program. Results . We found that patients with CT ABCB1 ( rs4148738 ) C>T genotype had higher Cmin,ss /D value than patients with TT genotype (6.23 [4;13] vs 5.77 [4;17], p=0.018). No statistically significant associations were found between carriage of CYP3A4*22 (rs35599367) C>T, CYP3A5*3 A>G, ABCB1 (rs1045642) C>T gene polymorphisms and Cmin,ss /D value of apixaban. Also, there was no significant effect of carrying polymorphisms rs35599367, rs776746, rs4148738,rs4148642, and the above genes on the risks of hemorrhagic complications. However, the influence of ABCB1 (rs1045642) C>T polymorphism on the PT value was found ( TT ABCB1 ( rs1045642 ) C>T genotype carriers the CT value wassignificantly higher than in CT genotype (17.0 [40;112] vs. 14.9 [35;132]) p=0.044). Conclusion . It was found that the Cmin,ss /D value was higher in patients with CT ABCB1 (rs4148738) C>T genotype than in patients with TT genotype. At the same time, carriage of polymorphisms of CYP3A4*22 (rs35599367) C>T , CYP3A5*3 A>G , ABCB1 (rs1045642) C>T genes did not affect the pharmacokinetics of apixaban and the risk of bleeding. We also identified the effect of ABCB1 (rs1045642) C>T gene polymorphism on the PT value.