A Real-World Observational Study Evaluating the Probability of Glycemic Control with Basal Insulin or Glucagon-Like Peptide-1 Receptor Agonist in Japanese Patients with Type 2 Diabetes

Introduction The effectiveness of basal insulin (BI) or glucagon-like peptide-1 receptor agonists (GLP-1 RAs) in providing glycemic control in patients with type 2 diabetes (T2D) in Japanese routine practice is not well known. This real-world observational study evaluated the probability of achieving glycemic control in Japanese patients with T2D uncontrolled by oral antidiabetic drugs (OADs) who initiated BI or GLP-1 RA therapy. Methods Patients with T2D aged >= 18 years initiating BI or GLP-1 RA therapy following treatment with OADs were selected from real-world data (RWD) retrieved from a large electronic medical record database in Japan, using data from 01 January 2010 to 30 June 2019. Patients were required to have glycated hemoglobin (HbA1c) >= 7% within 90 days prior to the first prescription of BI or GLP-1 RA. The probability of reaching first HbA1c < 7% was assessed over a 24-month period in cohorts of patients who initiated BI (n = 3477) or GLP-1 RA (n = 780) and in subcohorts by number of OADs at baseline (1, 2, or >= 3), HbA1c at baseline (>= 7 to < 8%, >= 8 to < 9%, or >= 9%), and age (< 65 or >= 65 years). Results Mean (standard deviation) baseline HbA1c was 9.4% (1.8%) and 8.8% (1.4%) in patients initiating BI or GLP-1 RA therapy, respectively. The cumulative probability of achieving glycemic control was 50.1% with BI and 60.3% with GLP-1 RA therapy, respectively, at 12 months, and 60.8% and 66.6%, respectively, at 24 months. Quarterly (3-month intervals) conditional probabilities of achieving glycemic control decreased over time and were < 10% after 12 months. Patients with more OADs or higher HbA1c at baseline had a lower probability of achieving glycemic control. Conclusion Among Japanese patients with T2D who initiated BI or GLP-1 RA therapy after treatment with OADs, the probability of reaching first glycemic control diminished over time. Further therapy intensification is warranted in patients who do not achieve glycemic control within 6-12 months with BI or GLP-1 RA, particularly those with high HbA1c or taking multiple OADs. Plain Language Summary Patients with type 2 diabetes (T2D) who are taking oral antidiabetic drugs (OADs) but still have high blood glucose often require injectable drugs, such as basal insulin (BI) or glucagon-like peptide-1 receptor agonists (GLP-1 RAs). While BI and GLP-1 RAs have been shown to be effective in controlled clinical trials, it is unclear how well they improve blood glucose in real-world routine practice. Here, we report the results of an observational study that used data retrieved from a large electronic medical records database in Japan to explore how well BI and GLP-1 RAs allow patients to achieve glycemic control [glycated hemoglobin (HbA1c) < 7%]. In Japanese patients with T2D receiving treatment with OADs and initiating BI or GLP-1 RA therapy, the probability of achieving glycemic control in the first quarter (3 months) after initiation was 20.3% with BI and 38.6% with GLP-1 RA. Among those patients who had not previously reached glycemic control, the probability of achieving first glycemic control declined over time, as evidenced in each quarterly assessment, and it was < 10% after the first year. Patients who had higher HbA1c levels or were taking multiple OADs were less likely to achieve glycemic control compared with those with lower HbA1c or taking fewer OADs. Our findings suggest that patients who have not achieved their glycemic goals within the first 6-12 months after starting BI or GLP-1 RA therapy have a low likelihood of achieving their target by maintaining the same therapy. For such patients, intensification with additional medication (e.g., combined BI and GLP-1 RA therapy) should be considered early in treatment.