The company has anounced results from PIONEER 2, the second phase 3a trial with oral semaglutide for treatment of adults with type 2 diabetes.
Oral semaglutide is a new GLP-1 analogue taken once daily as a tablet. The 52-week, open label trial investigated the efficacy and safety of 14 mg oral semaglutide compared with 25 mg empagliflozin in 816 people with type 2 diabetes, inadequately controlled on metformin. The confirmatory endpoints were defined after 26 weeks of treatment.
Two distinct statistical approaches to evaluating the effects of oral semaglutide were applied in the PIONEER 2 trial; a primary statistical approach required by recent regulatory guidance evaluating the effect regardless of discontinuation of treatment and use of rescue medication, and a secondary statistical approach describing the effect while on treatment and without use of rescue medication.
The trial achieved its primary objective according to the primary statistical approach by demonstrating a statistically significant and superior improvement in HbA1c with oral semaglutide compared to empagliflozin at 26 weeks. Difference in weight loss at 26 weeks between oral semaglutide and empagliflozin was not statistically significant when applying the primary statistical approach.
When applying the secondary statistical approach, people treated with 14 mg oral semaglutide achieved a statistically significant improvement in HbA1c of 1.4% at 26 weeks and 1.3% at 52 weeks, compared to an improvement in HbA1c of 0.9% and 0.8% with 25 mg empagliflozin at 26 and 52 weeks, respectively. The 14 mg dose of oral semaglutide demonstrated weight loss of 4.2 kg at 26 weeks and 4.7 kg at 52 weeks versus 3.8 kg with 25 mg empagliflozin at both 26 weeks and 52 weeks. The increased weight loss with oral semaglutide was statistically significant compared to empagliflozin at the 52-week time point.
In addition, applying the secondary statistical approach, the American Diabetes Association (ADA) treatment target of HbA1c below 7.0% was achieved by 72% of people treated with 14 mg oral semaglutide compared with 47% of people treated with 25 mg empagliflozin at 52 weeks.
In the trial, oral semaglutide was well-tolerated and with a profile consistent with GLP-1-based therapy. The most common adverse event for oral semaglutide was mild to moderate nausea, which diminished over time. In PIONEER 2, 20% of people treated with oral semaglutide experienced nausea during the trial. The proportion of subjects who discontinued treatment due to adverse events was 11% for people treated with 14 mg oral semaglutide compared to 4% for people treated with 25 mg empagliflozin.
“We are very excited about these results, which demonstrate that people treated with 14 mg oral semaglutide for one year achieved statistically significant reductions in blood glucose and body weight compared to people treated with 25 mg empagliflozin,” said Mads Krogsgaard Thomsen, executive vice president and chief science officer of Novo Nordisk. “PIONEER 2 is an important milestone in the clinical development of oral semaglutide and we look forward to further understanding the clinical profile of oral semaglutide in the remaining PIONEER trials.”