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  • Title: Progression to insulin for patients with diabetes mellitus using the Texas Medicaid database.
    Author: Rascati KL, Richards KM, Lopez D, Cheng LI, Wilson JP.
    Journal: Clin Ther; 2011 Dec; 33(12):2016-20. PubMed ID: 22101160.
    Abstract:
    BACKGROUND: Patients newly diagnosed with type 2 diabetes mellitus generally initiate therapy with either metformin [Met] or a sulfonylurea [SU] drug, followed by the addition of a second agent (Met, an SU drug, or a thiazolidinedione [TZD] drug) if the diabetes is not well controlled. If necessary, the usual third line of treatment is the addition of insulin. OBJECTIVE: The purpose of our study was to compare the progression to insulin among 3 cohorts receiving the oral antidiabetic (OAD) drug combinations Met/SU, Met/TZD, or SU/TZD. METHODS: This study used data from the Texas Medicaid database. The date of addition of a second OAD was considered a patient's index date and patients were followed for up to 5 years. Cox proportional hazards regression compared the progression to first insulin use among cohorts, using the Met/SU cohort as the reference group, while adjusting for demographics, comorbidities, and propensity scores. RESULTS: A total of 4083 patients were included in the study (Met/SU = 2872, Met/TZD = 438, and SU/TZD = 773). Insulin was added to the medication regimen of patients by the end of follow-up in 19.7% of the Met/SU cohort, 17.6% of the Met/TZD cohort, and 26.3% of the SU/TZD cohort. The adjusted Cox proportional model estimated that patients in the SU/TZD cohort had a 40% higher probability of progression to insulin than patients in the Met/SU cohort (odds ratio [OR] = 1.40; 95% CI, 1.19-1.64), whereas there was no significant difference between the Met/TZD and Met/SU cohorts (OR = 0.85; 95% CI, 0.67-1.08). CONCLUSIONS: It appears that mechanism of action may play a role in progression to insulin for concomitant OAD agents. A slower progression to insulin was seen for patients receiving a paired sensitizer regimen (ie, Met/TZD) compared with those receiving a secretagogue sensitizer regimen (ie, SU/TZD).
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