Abstract:
:Objective. To evaluate the association of -174G/C IL-6 polymorphism with failure in therapeutic response to methotrexate (MTX) or leflunomide (LEF). This prospective, observational cohort included 96 Mexican-Mestizo patients with moderate or severe rheumatoid arthritis (RA), initiating MTX or LEF, genotyped for IL-6 -174G/C polymorphism by PCR-RFLP. Therapeutic response was strictly defined: only if patients achieved remission or low disease activity (DAS-28 < 3.2). Results. Patients with MTX or LEF had significant decrement in DAS-28 (p < 0.001); nevertheless, only 14% and 12.5% achieved DAS-28 < 3.2 at 3 and 6 months. After 6 months with any of these drugs the -174G/G genotype carriers (56%) had higher risk of therapeutic failure compared with GC (RR: 1.19, 95% CI: 1.07-1.56). By analyzing each drug separately, after 6 months with LEF, GG genotype confers higher risk of therapeutic failure than GC (RR = 1.56; 95% CI = 1.05-2.3; p = 0.003), or CC (RR = 1.83; 95% CI = 1.07-3.14; p = 0.001). This risk was also observed in the dominant model (RR = 1.33; 95% CI = 1.03-1.72; p = 0.02). Instead, in patients receiving MTX no genotype was predictor of therapeutic failure. We concluded that IL-6 -174G/G genotype confers higher risk of failure in therapeutic response to LEF in Mexicans and if confirmed in other populations this can be used as promissory genetic marker to differentiate risk of therapeutic failure to LEF.
journal_name
Biomed Res Intjournal_title
BioMed research internationalauthors
Ruiz-Padilla AJ,Gamez-Nava JI,Saldaña-Cruz AM,Murillo-Vazquez JD,Vazquez-Villegas ML,Zavaleta-Muñiz SA,Martín-Márquez BT,Ponce-Guarneros JM,Rodriguez Jimenez NA,Flores-Chavez A,Sandoval-Garcia F,Vasquez-Jimenez JC,Cardona-Muñoz Edoi
10.1155/2016/4193538subject
Has Abstractpub_date
2016-01-01 00:00:00pages
4193538eissn
2314-6133issn
2314-6141journal_volume
2016pub_type
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