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-- Study Primary Endpoint Was Not Met; Improvement in Multiple Measures of Fibrosis and Liver Injury Was Observed with Investigational Firsocostat and Cilofexor --
-- Regimens Were Well Tolerated and Safety Measures Were Consistent with Prior Studies –
FOSTER CITY, Calif.--(BUSINESS WIRE)-- Gilead Sciences, Inc. (Nasdaq: GILD) today announced topline results from the 48-week, Phase 2 ATLAS study of combination and monotherapy investigational treatments for advanced fibrosis (F3-F4) due to NASH. While no regimen led to a statistically significant increase in the proportion of patients who achieved the primary efficacy endpoint of a ≥1-stage improvement in fibrosis without worsening of NASH, statistically significant improvements in multiple response measures of fibrosis and liver function were observed in patients treated with a combination of the acetyl-CoA carboxylase (ACC) inhibitor firsocostat and the selective, nonsteroidal farnesoid X receptor (FXR) agonist cilofexor, compared with placebo in patients with advanced fibrosis.
The Phase 2 ATLAS study is a randomized, double-blind, placebo-controlled study that evaluated the safety and efficacy of monotherapy and dual combination regimens of cilofexor 30 mg, firsocostat 20 mg and selonsertib 18 mg in patients with advanced fibrosis (F3-F4) due to NASH. The selonsertib monotherapy treatment group was discontinued following termination of the previously reported STELLAR trials of selonsertib.
In the 392 enrolled and dosed patients, of whom 56 percent had compensated cirrhosis, a ≥1-stage improvement in fibrosis without worsening of NASH after 48 weeks of treatment was observed in the following:
Table: Week 48 Primary Endpoint - Histologic Responses* | ||||||
Endpoint, n (%) | FIR (n=33) | CILO (n=34) | SEL/FIR (n=71) | SEL/CILO (n=68) | FIR/CILO (n=67) | Placebo (n=38) |
Fibrosis improvement without NASH worsening | 4 (12.1%) p=0.94 | 4 (11.8%) p=0.96 | 11 (15.5%) p=0.62 | 13 (19.1%) p=0.26 | 14 (20.9%) p=0.17 | 4 (10.5%) |
CILO, cilofexor (FXR agonist); FIR, firsocostat (ACC inhibitor); SEL, selonsertib (ASK1 inhibitor; SEL monotherapy arm [n=39] discontinued mid-trial). | ||||||
* Observed case analysis assessed by a central pathologist according to the NASH Clinical Research Network (CRN) classification. All p-values (compared with placebo) were adjusted for presence of F4 and diabetes at baseline. | ||||||
NASH resolution without worsening of fibrosis was uncommon in all treatment groups, including no placebo-treated patients and 4.5 percent of those treated with firsocostat and cilofexor (p=0.35).
Statistically significant improvements in multiple secondary endpoints were observed in patients treated with firsocostat and cilofexor compared with placebo, including a ≥2-point reduction in the NAFLD Activity Score (NAS) and ≥1-point reductions in steatosis, hepatocellular ballooning and lobular inflammation. Statistically significant improvements in noninvasive tests of fibrosis, liver injury and function, including ALT, AST, bilirubin and ELF score, were also observed in patients treated with this regimen compared with placebo.
Firsocostat, cilofexor and selonsertib, as monotherapies and dual combination regimens, were generally well tolerated. The most common adverse events in patients treated with the combination of firsocostat and cilofexor were mild to moderate pruritus (28.2 percent vs 15.4 percent with placebo; no discontinuations), headache, diarrhea and nausea. In patients treated with firsocostat and cilofexor, changes in lipid parameters were similar to those observed previously; 3.9 percent of patients experienced asymptomatic Grade 3 triglyceride elevations (>500 and
