The last 12 months have also seen a large number of articles published on sequential therapy, testing the efficacy of this regimen in different parts of the world. The study on sequential therapy with the highest impact was a multicenter study conducted in Latin America, which compared 14-day triple, 5-day concomitant, and 10-day sequential therapies. In this study, the results of eradication with 14-day standard therapy were 82.2% compared to 73.6% with 5-day concomitant/quadruple therapy and 76.5% with 10-day sequential therapy. Neither of four-drug regimen was significantly better than standard

triple therapy in any of the seven sites [7]. This has been the largest study so far that has Vorinostat cost not favored sequential therapy over triple therapy. Sequential therapy has been proposed as a means of overcoming clarithromycin resistance, but a study this year, while showing good overall eradication rates also showed that therapy

is less effective in clarithromycin resistant strains [8]. Other studies carried out in various parts of the world showed Stem Cell Compound Library research buy very promising results for sequential therapy. In Israel, the 10-day sequential therapy gave an eradication rate of 95.8% by per-protocol analysis and 92.7% by intention-to-treat analysis [9]. A dedicated study of sequential therapy as a second-line regime was also carried out in Taiwan and revealed excellent eradication rates of 95.1% [10]. In Korea, a study compared the eradication rate of the 10-day sequential therapy with that of the 14-day standard therapy and found a significantly higher rate of eradication in the sequential group (92.6 vs 85%) with no difference in adverse events [11]. Two other studies from Korea compared sequential therapy to a 7-day standard regime and also showed superior eradication in favor of sequential therapy [12, 13]. In Taiwan, sequential therapy was also superior to standard triple therapy (93 vs 80%) with similar rates of adverse events and compliance [14]. Further studies MCE in Italy have also

shown consistently impressive eradication rates for the regimen with one study showing eradication rates of 92.5 vs 73.7% for standard triple therapy in a treatment-naive population. This study looked at sequential therapy as a second-line regimen also and found 95% eradication rates, albeit in a small cohort (38/40) [15]. Another Italian study obtained an eradication rate of 90.9% [16]. Results in Turkey in a noncomparative study were less impressive, showing an eradication rate of 74.3% by per-protocol analysis and 66.5% by intention-to-treat analysis with the best results obtained when tetracycline rather than metronidazole was used in the regime along with amoxicillin and clarithromycin [17]. It has been suggested that levofloxacin rather than clarithromycin can also offer superior eradication in sequential regimes.