Tirzepatide versus insulin, or on top of insulin
The other four trials in patients with type 2 diabetes reported by Lilly in releases included SURPASS-1, which randomized 478 patients to treatment with tirzepatide or placebo as monotherapy; SURPASS-3, which randomized 1,444 patients to tirzepatide or insulin degludec (Tresiba) on top of background treatment with metformin; SURPASS-4, which randomized 2,002 patients with high cardiovascular disease risk to treatment with tirzepatide or insulin glargine (Lantus) on top of background treatment with one to three different oral drugs; and SURPASS-5, which randomized 475 patients to treatment with tirzepatide or placebo on top of background treatment with insulin glargine and optional addition of metformin. Altogether, the five trials randomized nearly 6,300 patients.
The studies that compared tirzepatide against two different types of insulin, and the third that tested tirzepatide on top of insulin glargine, are especially notable. “It’s good to see that the combination [of tirzepatide and insulin glargine] works without causing major adverse events,” said Dr. Amaro.
“These are fair and helpful comparisons. I applaud Lilly for doing the right kind of comparisons,” said Dr. Gabbay.
In total, the five studies “provide evidence that tirzepatide will be effective at all stages of type 2 diabetes and can safely be used in combination with other glucose-lowering agents, including insulin,” said Dr. Lingvay. The studies with active comparator agents “allow us to compare tirzepatide’s efficacy against established therapies.”
The SURPASS trials were sponsored by Lilly, which is developing tirzepatide. Dr. Gabbay had no relevant disclosures. Dr. Lingvay has received research funds, consulting and advisory fees, or other support from Lilly as well as from several other companies including Novo Nordisk, which markets semaglutide (Ozempic) and insulin degludec (Tresiba), and Sanofi, which markets insulin glargine (Lantus). Dr. Amaro has received research funding from Lilly and from Fractyl, and has been a consultant to and received research funding from Novo Nordisk.