Roche Reports Positive Phase 2 Data for Obesity Drug
Roche says its experimental dual GLP-1/GIP receptor agonist CT-388 delivered substantial and statistically significant weight loss in a Phase 2 study of people living with obesity, supporting the drug’s advancement into late-stage development. Topline results from the CT388-103 trial showed that once-weekly subcutaneous injections of CT-388 produced a placebo-adjusted weight loss of 22.5% at 48 weeks at the highest dose tested (24 mg), without evidence of a weight loss plateau.
CT-388’s Phase 2 efficacy appears competitive with leading dual-agonist obesity drugs on the market (e.g., Lilly’s Zepbound (tirzepatide)) and stronger than typical results for semaglutide (Novo Nordisk’s Wegovy), but next-generation agents like Lilly’s retatrutide may exceed these benchmarks in extended trials.
More than half (54%) of participants in the study receiving CT-388’s 24 mg dose achieved resolution of obesity, compared with 13% in the placebo group, according to the company. Nearly all treated patients (95.7%) achieved at least 5% weight loss, while 47.8% lost 20% or more of their body weight and 26.1% lost at least 30%. Among participants who were prediabetic at baseline, 73% of those treated with CT-388 at the highest dose achieved normal blood glucose levels by week 48, compared with 7.5% in the placebo arm, it says.
Roche says the treatment was generally well tolerated, with gastrointestinal side effects that were mostly mild to moderate and consistent with the known safety profile of incretin-based therapies. Discontinuation due to adverse events was low, occurring in 5.9% of participants across CT-388 treatment arms, compared with 1.3% in the placebo group. No new or unexpected safety signals were reported.
Roche expects to initiate its Phase 3 obesity program, known as Enith1 and Enith2, later this quarter.