2013年2月21日讯 / --19日，Gilead宣布sofosbuvir的第4个也是最后一个III期临床获得成功，这个被称为FUSION的三期研究评价了为期12周和16周的sofosbuvir（之前名为GS-7977）+免疫增强剂利巴韦林（ribavirin）组合疗法，对于之前治疗失败的2型或3型C型肝炎患者来说，治疗之后73%达到SVR。
如果获批，sofosbuvir将成为用于C型肝炎治疗的首个全口服组合治疗方案中的重要组成部分，并有望消除传统注射药物的需求。
英文报道：
Gilead Sciences (GILD) today announced topline results from the Phase 3 FUSION study evaluating 12- and 16-week courses of therapy with the once-daily nucleotide sofosbuvir plus ribavirin (RBV) in treatment-experienced patients with genotype 2 or 3 chronic hepatitis C virus (HCV) infection who failed prior treatment. The study met its primary efficacy endpoint of superiority compared to a predefined historic control sustained virologic response (SVR) rate of 25 percent. In FUSION, 50 percent of patients (n=50/100) in the 12-week arm and 73 percent of patients (n=69/95) in the 16-week arm achieved SVR12 (p<0.001 for both arms).
"This study demonstrates that all-oral therapy with sofosbuvir provides significant efficacy among difficult-to-treat hepatitis C patients who could not be cured by prior regimens containing pegylated interferon and now have limited treatment options," said Norbert Bischofberger, PhD, Executive Vice President of Research and Development and Chief Scientific Officer. "With positive results from all four Phase 3 trials now in hand, Gilead is on track to meet its goal of filing regulatory applications in the United States and Europe in the second quarter."
In the FUSION study, HCV genotype 2 or 3 patients who failed prior interferon-based therapy were randomized (1:1) to receive either a 12-week (n=103) or 16-week (n=98) course of sofosbuvir 400 mg once daily plus RBV (1,000 or 1,200 mg/day). Sixty-three percent of patients were infected with genotype 3. In the 12-week arm, SVR12 rates were 86 percent among genotype 2 and 30 percent among genotype 3 patients. In the 16-week arm, SVR12 rates were 94 percent among genotype 2 and 62 percent among genotype 3 patients. Among the 34 percent of FUSION participants who had compensated cirrhosis at baseline, 31 percent achieved SVR12 in the 12-week arm, and 66 percent achieved SVR12 in the 16-week arm. All patients in the study became HCV negative on treatment, and relapse accounted for all virologic failures.
No patients discontinued sofosbuvir or RBV due to adverse events. The most common adverse events reported in ≥15 percent of patients in the study were fatigue, headache, insomnia and nausea.
Results from all four pivotal Phase 3 studies of sofosbuvir – FUSION, POSITRON, FISSION and NEUTRINO – will support the initial regulatory filing for sofosbuvir as part of all-oral therapy with RBV among genotype 2 and 3 treatment-na?ve, treatment-experienced and interferon-intolerant HCV patients, and for sofosbuvir in combination with RBV and pegylated interferon among treatment-na?ve patients with genotypes 1, 4, 5 and 6.