Abstract
INTRODUCTION: Tirzepatide, a once-weekly glucose-dependent insulinotropic polypeptide/glucagon-like peptide-1 receptor agonist, provides clinically meaningful improvements in glycaemic control and body weight loss in people with type 2 diabetes. The early efficacy profile of tirzepatide after treatment initiation is of interest. In this exploratory pre-planned analysis, we evaluated the time to achieve glycaemic control and body weight loss thresholds with tirzepatide. METHODS: In two randomised studies, we compared time to achieve HbA1c (< 7.0% and ≤ 6.5%) and weight loss (≥ 5%, SURPASS-2 only) thresholds among people treated with tirzepatide (5, 10, and 15 mg), semaglutide 1 mg in SURPASS-2, and titrated insulin degludec in SURPASS-3. Longitudinal logistic regression models were used to explore the proportion of participants achieving HbA1c and body weight loss thresholds at 4, 12, and 24 weeks. The time to achieve these thresholds was analysed and compared between groups using the Cox proportional-hazards model. RESULTS: Overall, greater proportions of participants achieved the HbA1c and body weight loss thresholds at 4, 12, and 24 weeks with tirzepatide compared with semaglutide 1 mg and insulin degludec. The median time to achieve HbA1c < 7.0% (8.1 weeks with each tirzepatide dose, 12.0 weeks with semaglutide 1 mg, and 12.1 weeks with insulin degludec) and ≤ 6.5% (12.1, 15.7, and 24.1 weeks, respectively) was faster with tirzepatide than semaglutide 1 mg and insulin degludec. In SURPASS-2, the median time to first achieve a body weight loss of ≥ 5% was faster with tirzepatide 5 mg (16.0 weeks) and 10 and 15 mg (12.4 weeks) than with semaglutide 1 mg (24.0 weeks). CONCLUSION: Analyses of data from SURPASS-2 and -3 revealed that tirzepatide treatment enabled more people with type 2 diabetes to achieve glycaemic thresholds and these were achieved faster than with semaglutide 1 mg or insulin degludec. Tirzepatide-treated participants also achieved a body weight loss of ≥ 5% significantly faster with tirzepatide than with semaglutide 1 mg. TRIAL REGISTRATION NUMBERS: NCT03987919; NCT03882970.