Comparative Bioavailability of a Novel Solution and a Tablet Formulation of Levothyroxine.

Levothyroxine (LT4) is the standard of care for treating hypothyroidism. Despite the established efficacy of LT4, 50% of treated patients fail to achieve normal thyrotropin levels. Oral formulations of LT4 that bypass the gastric phase of dissolution may offset some of the therapeutic shortcomings observed with tablets. An oral solution of LT4 can be administered to patients who are unable to swallow tablets; allows flexibility to individualize dosing; and may mitigate interference with LT4 absorption caused by food, coffee, increased gastric pH from atrophic gastritis, and malabsorption from bariatric surgery. The bioavailability of a novel LT4 oral solution and a reference LT4 tablet were compared in a randomized, laboratory-blinded, single-dose, 2-period, 2-sequence, crossover study in healthy euthyroid subjects. A single 600-µg oral dose of LT4 solution (30 mL × 100 µg/5 mL) or tablet (2 × 300-µg tablet) was administered under fasting conditions in each study period, and total thyroxine concentrations were measured for 72 hours after administration. The ratio of geometric least-squares means and 90% confidence intervals for area under the concentration-time curve from time 0 to 72 hours and maximum plasma concentration were calculated. Among 42 subjects in the pharmacokinetic population, the geometric least-squares mean ratio of area under the concentration-time curve from time 0 to 72 hours and maximum plasma concentration for baseline-adjusted thyroxine was 109.1% and 107.9%, respectively, meeting Food and Drug Administration bioequivalence criteria. Adverse events (AEs) were similar between treatment groups with no serious AEs or discontinuations for AEs. Comparable bioavailability was observed between the LT4 oral solution and reference tablet after a single oral 600-µg dose under fasting conditions.

Comparison of vildagliptin and rosiglitazone monotherapy in patients with type 2 diabetes: a 24-week, double-blind, randomized trial.

OBJECTIVE: To compare the efficacy and tolerability of vildagliptin and rosiglitazone during a 24-week treatment in drug-naïve patients with type 2 diabetes. RESEARCH DESIGN AND METHODS: This was a double-blind, randomized, active-controlled, parallel-group, multicenter study of 24-week treatment with vildagliptin (100 mg daily, given as equally divided doses; n = 519) or rosiglitazone (8 mg daily, given as a once-daily dose; n = 267). RESULTS: Monotherapy with vildagliptin and rosiglitazone decreased A1C (baseline = 8.7%) to a similar extent during the 24-week treatment, with most of the A1C reduction achieved by weeks 12 and 16, respectively. At end point, vildagliptin was as effective as rosiglitazone, improving A1C by -1.1 +/- 0.1% (P < 0.001) and -1.3 +/- 0.1% (P < 0.001), respectively, meeting the statistical criterion for noninferiority (upper-limit 95% CI for between-treatment difference < or =0.4%). Fasting plasma glucose decreased more with rosiglitazone (-2.3 mmol/l) than with vildagliptin (-1.3 mmol/l). Body weight did not change in vildagliptin-treated patients (-0.3 +/- 0.2 kg) but increased in rosiglitazone-treated patients (+1.6 +/- 0.3 kg, P < 0.001 vs. vildagliptin). Relative to rosiglitazone, vildagliptin significantly decreased triglycerides, total cholesterol, and LDL, non-HDL, and total-to-HDL cholesterol (-9 to -16%, all P < or = 0.01) but produced a smaller increase in HDL cholesterol (+4 vs. +9%, P = 0.003). The proportion of patients experiencing an adverse event was 61.4 vs. 64.0% in patients receiving vildagliptin and rosiglitazone, respectively. Only one mild hypoglycemic episode was experienced by one patient in each treatment group, while the incidence of edema was greater with rosiglitazone (4.1%) than vildagliptin (2.1%). CONCLUSIONS: Vildagliptin is an effective and well-tolerated treatment option in patients with type 2 diabetes, demonstrating similar glycemic reductions as rosiglitazone but without weight gain.

Efficacy and Safety of ITCA 650, a Novel Drug-Device GLP-1 Receptor Agonist, in Type 2 Diabetes Uncontrolled With Oral Antidiabetes Drugs: The FREEDOM-1 Trial.

OBJECTIVE: ITCA 650 (exenatide in osmotic mini-pump) continuously delivers exenatide subcutaneously for 3-6 months. Two doses of ITCA 650 were compared with placebo in patients with uncontrolled type 2 diabetes. RESEARCH DESIGN AND METHODS: This 39-week, phase 3, double-blind, placebo-controlled trial randomized 460 patients aged 18-80 years with glycated hemoglobin (HbA1c) 7.5-10% [58-86 mmol/mol] 1:1:1 to placebo, ITCA 650 40 µg/day, or ITCA 650 60 µg/day. Primary end point was change in HbA1c at 39 weeks. RESULTS: Least squares (LS) mean change from baseline HbA1c was -1.1% [-12.2 mmol/mol] and -1.2% [-13.2 mmol/mol] for ITCA 650 40 and 60 µg/day, respectively (P < 0.001 vs. placebo -0.1% [-1.3 mmol/mol]). In a prespecified analysis, greater HbA1c reductions occurred in patients not receiving sulfonylureas (SUs) versus those receiving SUs (-1.7% vs. -1.2% [-18.6 and -13.1 mmol/mol]). At week 39, HbA1c <7% [53 mmol/mol] was attained in 37%, 44%, and 9% of ITCA 650 40 µg/day, ITCA 650 60 µg/day, and placebo groups, respectively (P < 0.001 each dose vs. placebo). LS mean change from baseline body weight was -2.3 kg and -3.0 kg for ITCA 650 40 and 60 µg/day, respectively (P ≤ 0.015 vs. placebo -1.0 kg). Nausea was the most common adverse event (AE) and subsided over time. Discontinuation for gastrointestinal AEs occurred in 7.2% with ITCA and 1.3% with placebo. Most AEs associated with procedures to place and remove ITCA 650 were mild and transient. CONCLUSIONS: ITCA 650 significantly reduced HbA1c and weight compared with placebo and was well tolerated in patients with uncontrolled type 2 diabetes on oral antidiabetes medications.

Clinical Impact of ITCA 650, a Novel Drug-Device GLP-1 Receptor Agonist, in Uncontrolled Type 2 Diabetes and Very High Baseline HbA1c: The FREEDOM-1 HBL (High Baseline) Study.

OBJECTIVE: ITCA 650 is a subdermal osmotic mini-pump that continuously delivers exenatide subcutaneously for 3-6 months. The efficacy, safety, and tolerability of ITCA 650 added to diet and exercise alone or combined with metformin, sulfonylurea, or thiazolidinedione monotherapy or a combination of these drugs was evaluated in poorly controlled patients with type 2 diabetes (T2D) who were ineligible for participation in a placebo-controlled study (FREEDOM-1) because of severe hyperglycemia (HbA1c >10% [86 mmol/mol]). RESEARCH DESIGN AND METHODS: This 39-week, open-label, phase 3 trial enrolled patients aged 18-80 years with HbA1c >10% to ≤12% (86-108 mmol/mol) and BMI 25-45 kg/m2. Patients received ITCA 650 20 µg/day for 13 weeks, then 60 µg/day for 26 weeks. The primary end point was change in HbA1c at week 39. RESULTS: Sixty patients were enrolled. At baseline, mean HbA1c was 10.8% (94.7 mmol/mol) and mean (± SD) duration of diabetes was 8.6 (± 5.3) years. At week 39, there was a mean reduction in HbA1c of -2.8% (-30.3 mmol/mol; P < 0.001 vs. baseline) and in body weight of -1.2 kg (P = 0.105), and 25% of patients achieved HbA1c <7% (53 mmol/mol). A reduction in HbA1c of ≥1% (≥10.9 mmol/mol) occurred in 90% of patients. The most common adverse events were nausea, vomiting, diarrhea, and headache. Gastrointestinal adverse events were generally transient and subsided over time; only 4 patients (6.7%) discontinued for gastrointestinal events. CONCLUSIONS: Treatment with ITCA 650, the first injection-free glucagon-like peptide 1 receptor agonist, resulted in significant improvements in glycemic control in poorly controlled long-standing T2D patients with a high baseline HbA1c >10%.

PRESERVE-beta: two-year efficacy and safety of initial combination therapy with nateglinide or glyburide plus metformin.

OBJECTIVE: To compare long-term efficacy and safety of initial combination therapy with nateglinide/metformin versus glyburide/metformin. RESEARCH DESIGN AND METHODS: We conducted a randomized, multicenter, double-masked, 2-year study of 428 drug-naïve patients with type 2 diabetes. Patients received 120 mg a.c. nateglinide or 1.25 mg q.d. glyburide plus 500 mg q.d. open-label metformin for the initial 4 weeks. During a subsequent 12-week titration period, glyburide and metformin were increased by 1.25- and 500-mg increments to maximum daily doses of 10 and 2,000 mg, respectively, if biweekly fasting plasma glucose (FPG) > or = 6.7 mmol/l. Nateglinide was not titrated. Blinding was maintained by use of matching placebo for nateglinide and glyburide. An 88-week monitoring period followed, during which HbA1c (A1C), FPG, and postprandial glucose excursions (PPGEs) during an oral glucose tolerance test were measured. RESULTS: In nateglinide/metformin-treated patients, mean A1C was 8.4% at baseline and 6.9% at week 104. In glyburide/metformin-treated patients, mean A1C was 8.3% at baseline and 6.8% at week 104 (P < 0.0001 vs. baseline for both treatments, NS between treatments). The deltaPPGE averaged -96 +/- 19 (P < 0.0001) and -57 +/- 22 mmol.l(-1).min(-1) (P < 0.05) in patients receiving nateglinide/metformin and glyburide/metformin, respectively, whereas deltaFPG was -1.6 +/- 0.2 (P < 0.0001) and -2.4 +/- 0.2 mmol/l (P < 0.0001) in patients receiving nateglinide/metformin and glyburide/metformin, respectively (P < 0.01 between groups). Thus, the two treatments achieved similar efficacy with differential effects on FPG versus PPGE. Hypoglycemia occurred in 8.2 and 17.7% of patients receiving nateglinide/metformin and glyburide/metformin, respectively. CONCLUSIONS: Similar good glycemic control can be maintained for 2 years with either treatment regimen, but nateglinide/metformin may represent a safer approach to initial combination therapy.

Efficacy and tolerability of initial combination therapy with nateglinide and metformin in treatment-naïve patients with type 2 diabetes.

OBJECTIVE: To assess the efficacy and tolerability of the combination of nateglinide (120 mg, ac) and metformin (500 mg, tid) as initial treatment in drug-naïve patients with type 2 diabetes mellitus (T2DM). RESEARCH DESIGN AND METHODS: This study reports data from the treatment-naïve (TN) subgroup of patients in a previously published, randomized, multicenter, placebo-controlled, 24- week trial that compared nateglinide, metformin, and the combination therapy (CT) in 701 patients with T2DM with baseline HbA(1c) between 6.8% and 11.0%. Of the 401 TN patients, 104, 104, 89, and 104 patients received nateglinide (120 mg, ac), metformin (500 mg, tid), CT, and placebo, respectively. The baseline characteristics of each group were similar, with mean age, BMI, duration of diabetes, HbA(1c), and fasting plasma glucose (FPG) levels of approximately 58 years, 30 kg/m(2), 4 Gastrointestinal side effects occurred in 27% of years, 8.2%, and 10.2 mmol/L, respectively. RESULTS: In patients receiving initial CT, HbA(1c) decreased substantially (Delta = -1.6 +/- 0.1%, p < 0.0001 vs. baseline or placebo) from a mean baseline of 8.2 +/- 0.1%, an effect significantly greater than the 0.8% reduction observed with both monotherapies (p < 0.001); whereas, in placebo-treated patients, HbA(1c) increased modestly (Delta = +0.3 +/- 0.1%, p < 0.05) from an identical baseline value. Seventy percent of CT-treated patients achieved a target HbA(1c) of < 7.0%. Both fasting plasma glucose (FPG) and the 2-hour postprandial glucose excursion (PPGE) after a liquid meal challenge decreased by 2.3 mmol/L in patients receiving CT, while the changes from baseline values in FPG and PPGE were +0.2 +/- 0.3 mmol/L and -0.5 +/- 0.2 mmol/L, respectively, in placebo-treated patients. The incremental 30-minute post-load insulin levels increased by 88 +/- 32 pmol/L (p = 0.006) in patients receiving CT and did not change significantly in placebo-treated patients. patients receiving CT (vs. 27.9% in the metformin monotherapy, and 14.4% in the placebo groups). Confirmed hypoglycemia (glucose

Influence of baseline glycemia on outcomes with insulin glargine use in patients uncontrolled on oral agents.

PURPOSE: Optimizing glycemic control in patients with type 2 diabetes mellitus (T2DM) not controlled with ≥ 1 oral antidiabetes drugs (OADs) is challenging. Many therapeutic options exist; however, data comparing the effectiveness of different strategies are lacking for the management of patients with T2DM. Our study aim was to provide comparative data on efficacy and hypoglycemia when initiating insulin glargine (glargine) versus alternative treatment options (not including the newest antidiabetes agents, glucagon-like peptide [GLP]-1 receptor agonists, dipeptidyl peptidase [DPP]-4 inhibitors or sodium-glucose linked transporter [SGLT]-2 inhibitors) in insulin-naive patients with T2DM who remained uncontrolled with OADs. METHODS: Patient-level data were pooled from 9 randomized controlled trials of ≥ 24 weeks duration with comparable patient populations. The effect of adding glargine was compared with intensification of lifestyle interventions or OADs, addition of neutral protamine Hagedorn (NPH) insulin, insulin lispro, premixed insulin, or all comparators pooled, on patient glycated hemoglobin (HbA1c) level, fasting plasma glucose level, weight, and hypoglycemia. RESULTS: A greater proportion of patients achieved a target HbA1c level ≤ 7.0% with glargine treatment than with pooled comparators, intensification of OADs, or lifestyle interventions; there was no difference when compared with NPH, premixed, or insulin lispro use. The rate for reported hypoglycemic events was lower for glargine use than for pooled comparators or other insulins, but higher compared with intensification of lifestyle interventions or OADs. When stratified by baseline HbA1c level, efficacy/target attainment with glargine use was better than for pooled comparators across all HbA1c strata; OAD intensification, when baseline HbA1c level was ≥ 8.0%; and premixed insulin if baseline HbA1c level was < 8.0%; but similar to other insulins for all other categories. The incidence of reported hypoglycemia was less frequent with glargine use than other insulins, but more frequent than intensification of lifestyle interventions or OADs. CONCLUSION: When adequate glycemic control is not achieved using OADs in patients with T2DM, initiating insulin glargine is generally less likely to elicit hypoglycemia than initiating NPH, premixed, or prandial insulins, and the benefit-risk balance supports initiating insulin rather than intensification of OAD therapy when baseline HbA1c level is ≥ 8.0%.

Efficacy and risk of hypoglycemia with use of insulin glargine or comparators in patients with cardiovascular risk factors.

BACKGROUND: Cardiovascular risk factors (CVRFs) may complicate optimization of therapy in patients with type 2 diabetes mellitus (T2DM) inadequately controlled with oral antidiabetes drugs (OADs). We assessed the influence of patient baseline CVRFs on efficacy and rate of hypoglycemia with use of insulin glargine (glargine) added to ongoing OAD treatment compared with alternative therapeutic options; namely, intensification of lifestyle interventions or adding OADs, neutral protamine Hagedorn (NPH), lispro, or premixed insulin in patients failing OADs. METHODS: Patient-level data were pooled from 9 randomized controlled trials of glargine and comparators for 24 weeks in insulin-naive patients with T2DM inadequately controlled on OADs. Efficacy (goal attainment-glycated hemoglobin (HbA1c) level ≤ 7.0% or decrease ≥ 1.0% change from baseline) and hypoglycemia rates (symptomatic, confirmed, nocturnal, or severe) were compared for patients treated with glargine (n = 1462) and pooled (n = 1476) and individual comparators, overall; and in patients with hypertension (~69%), dyslipidemia (~58%), history of cardiovascular disease (~25%), or any CVRF (~83%) at baseline. RESULTS: The patient groups were well-balanced at baseline (HbA1c level 8.7%; diabetes duration, 8.6 years). Use of glargine was associated with greater patient goal attainment (57.7% vs 51.4% for HbA1c level ≤ 7.0%; P < 0.001), modestly larger reductions in HbA1c level (-1.68% vs -1.51%; P < 0.001), and less symptomatic hypoglycemia than occurred with pooled comparators, regardless of patient CVRFs (5.04 vs 7.01 events/patient-year of exposure, respectively; P < 0.001). Reductions in HbA1c level and hypoglycemia rates were significantly greater with glargine use than with intensification of OADs or lifestyle modifications, overall, and in patients with any CVRF. Reductions in HbA1c level were greater and hypoglycemia rates lower with use of glargine compared with premixed insulin, overall, and in patients with any CVRF. Reductions in HbA1c level were similar and hypoglycemia rates lower with use of glargine, NPH, and lispro insulin, regardless of patient CVRFs. CONCLUSION: The glycemic benefits of glargine use compared with alternative therapeutic options are maintained without excess hypoglycemia in patients with CVRFs.

Continuous subcutaneous delivery of exenatide via ITCA 650 leads to sustained glycemic control and weight loss for 48 weeks in metformin-treated subjects with type 2 diabetes.

AIMS: Evaluate the efficacy and tolerability of ITCA 650 in subjects with type 2 diabetes treated for up to 48 weeks. METHODS: This was a 24-week extension to a randomized, 24-week, open-label, phase 2 study in subjects with type 2 diabetes inadequately controlled with metformin. Subjects received ITCA 650 mg (20, 40, 60 or 80 µg/day). Mean changes for HbA1c, weight, and fasting plasma glucose (FPG) were evaluated. RESULTS: Mean changes in HbA1c from baseline to week 48 ranged from -0.85% to -1.51%. At week 48, ≥64% of subjects with an HbA1c ≤7% at week 24 maintained an HbA1c ≤7%. The incidence of adverse events (AEs) was dose-related and ranged from 13.3% with 20 µg/day to 37.5% with 80 µg/day. Most AEs were mild and transient; the incidence of nausea declined from 12.9% to 9.5% over the 24-week extension. One subject on ITCA 650 80 µg/day experienced mild intermittent vomiting. Three (3.5%) subjects experienced severe AEs, but none were considered related to study drug. CONCLUSION: Significant changes in HbA1c, body weight, and FPG attained with ITCA 650 were maintained to 48 weeks. The incidence of AEs was lower in the 24-week extension than in the initial 24-week treatment phase.

A randomized, open-label, multicenter, 4-week study to evaluate the tolerability and pharmacokinetics of ITCA 650 in patients with type 2 diabetes.

BACKGROUND: Exenatide, a glucagon-like peptide-1 receptor agonist administered by self-injection, decreases plasma glucose, glycosylated hemoglobin (HbA1c), and weight in patients with type 2 diabetes. ITCA 650 is an investigational new drug that provides continuous subcutaneous delivery of exenatide. OBJECTIVE: This randomized, open-label, multicenter, 28-day study evaluated the tolerability, pharmacodynamics, and pharmacokinetics of ITCA 650 in patients with type 2 diabetes. METHODS: The study enrolled patients with type 2 diabetes who were receiving a stable regimen of diet and exercise alone or a stable dose of metformin monotherapy, thiazolidinedione monotherapy, or metformin plus thiazolidinedione combination therapy. Patients were randomized to receive 10, 20, 40, or 80 µg/d of ITCA 650 placed subcutaneously for 28 days. Plasma glucose, HbA1c, insulin, and weight were measured at regular intervals throughout the study. Exenatide levels and anti-exenatide antibodies were also assessed. RESULTS: Forty-four patients were randomized to treatment. From baseline to end point, significant (P < 0.05) decreases in fasting plasma glucose levels, 2-hour postprandial glucose levels, and glucose AUC curve were seen in all treatment groups. HbA1c levels also decreased significantly (P < 0.001) in all 4 treatment groups. Weight was significantly (P < 0.05) lowered in the 40- and 80-µg/d groups. Detectable levels of exenatide were noted within 12 to 24 hours of ITCA 650 placement, reached steady state by 24 hours, and then remained relatively steady during a plateau period until device removal on day 29. Exenatide levels declined to undetectable levels within 24 hours after removal of the ITCA 650. The most common adverse events were nausea, decreased appetite, and vomiting; these were transient and mostly mild or moderate in severity. Mild local adverse events related to the healing process were common at the placement site but abated after 1 week. Twelve patients developed anti-exenatide antibodies; however, the pharmacokinetics of ITCA 650 were not altered compared with those who did not develop antibodies. CONCLUSIONS: ITCA 650 provided continuous and controlled subcutaneous delivery of exenatide for 28 days that was generally well tolerated and produced significant reductions in plasma glucose, HbA1c, and weight. Further studies are warranted to characterize the long-term tolerability and efficacy of ITCA 650 for the treatment of patients with type 2 diabetes. ClinicalTrials.gov identifier: NCT01798264.

Randomized trial of continuous subcutaneous delivery of exenatide by ITCA 650 versus twice-daily exenatide injections in metformin-treated type 2 diabetes.

OBJECTIVE: To evaluate ITCA 650, a continuous subcutaneous miniature osmotic pump delivery system of exenatide versus twice-daily exenatide injections (Ex-BID) in subjects with type 2 diabetes. RESEARCH DESIGN AND METHODS: We conducted a randomized, two-stage, 24-week, open-label, phase 2 study in type 2 diabetes inadequately controlled with metformin. Stage I: 155 subjects were randomized to 20 or 40 µg/day of ITCA 650 or Ex-BID 5 → 10 µg. Stage II: 131 subjects were rerandomized to 20, 40, 60, or 80 µg/day of ITCA 650. Change from baseline for HbA1c, weight, and fasting plasma glucose were evaluated at weeks 12 and 24. RESULTS: HbA1c was significantly lower in all groups after 12 and 24 weeks. Stage I: mean change in HbA1c from a mean baseline of 7.9-8.0% was -0.98, -0.95, and -0.72% for the 20 and 40 µg/day ITCA 650 and Ex-BID groups, respectively, with 63, 65, and 50% of subjects achieving HbA1c levels ≤ 7% (P < 0.05). Stage II: significant (P < 0.05) reductions in HbA1c (≈ 1.4% from baseline) were achieved with 60 and 80 µg/day ITCA 650, and 86 and 78% of subjects achieved HbA1c ≤ 7% at 24 weeks; respectively. Weight was reduced by 2.8-3.7 kg (P < 0.05) at 24 weeks in all except the 20 → 20 µg/day group. ITCA 650 was well tolerated; nausea was lower and transient with 20 µg/day relative to Ex-BID; and 60 µg/day had the best profile of tolerability and HbA1c lowering. CONCLUSIONS: ITCA 650 significantly reduced HbA1c and weight and was well tolerated. The 20 → 60 µg/day regimen was considered the best dose for further examination in phase 3.

Safety and efficacy of nateglinide/metformin combination therapy in the treatment of type 2 diabetes.

UNLABELLED: The increasing prevalence of type 2 diabetes provides impetus for both development of new drugs to improve glycemic control and for reconsideration of treatment strategies with existing agents. Combination therapy with complementary drug classes that act on different aspects of glycemic control has been a particularly effective strategy. This work reviews the published literature reporting efficacy and safety/tolerability of nateglinide, a rapid-onset insulinotropic agent with a predominant effect to reduce postprandial glucose, when combined with metformin, a first-line agent that suppresses hepatic glucose production and thereby reduces fasting plasma glucose. The nateglinide/metformin combination has consistently been found to be both efficacious and well tolerated, whether given as initial combination therapy in drug-naïve patients or when added to metformin monotherapy. Maximum efficacy (Delta glycosylated hemoglobin [HbA(1c)]= -1.4% to -1.9%, sustained for up to 2 years of treatment) was seen in studies of drug-naïve patients in whom pharmacotherapy was initiated with the combination of nateglinide and metformin, and modest reductions in HbA(1c) (Delta = -0.5% to -1.2%, sustained for up to 24 weeks) were found when nateglinide was added to ongoing metformin monotherapy. CONCLUSION: the combination of nateglinide and metformin provides a sustained degree of glycemic control not achievable with either agent given as monotherapy.

Effects of the dipeptidyl peptidase-IV inhibitor vildagliptin on incretin hormones, islet function, and postprandial glycemia in subjects with impaired glucose tolerance.

OBJECTIVE: This study was conducted to determine the effects of vildagliptin on incretin hormone levels, islet function, and postprandial glucose control in subjects with impaired glucose tolerance (IGT). RESEARCH DESIGN AND METHODS: A 12-week, double-blind, randomized, parallel-group study comparing vildagliptin (50 mg q.d.) and placebo was conducted in 179 subjects with IGT (2-h glucose 9.1 mmol/l, A1C 5.9%). Plasma levels of intact glucagon-like peptide 1 (GLP-1) and gastric inhibitory polypeptide (GIP), glucose, insulin, C-peptide, and glucagon were measured during standard meal tests performed at baseline and at week 12. Insulin secretory rate (ISR) was estimated by C-peptide deconvolution. The between-group differences (vildagliptin - placebo) in the adjusted mean changes from baseline to end point in the total and incremental (Delta) area under the curve (AUC)(0-2 h) for these analytes were assessed by ANCOVA; glucose AUC(0-2 h) was the primary outcome variable. RESULTS: Relative to placebo, vildagliptin increased GLP-1 (DeltaAUC, +6.0 +/- 1.2 pmol x l(-1) x h(-1), P < 0.001) and GIP (DeltaAUC, +46.8 +/- 5.4 pmol . l(-1) x h(-1), P < 0.001) and decreased glucagon (DeltaAUC, -3.0 +/- 1.0 pmol x l(-1) x h(-1), P = 0.003). Although postprandial insulin levels were unaffected (DeltaAUC, +20.8 +/- 35.7 pmol x l(-1) x h(-1), P = 0.561), prandial glucose excursions were reduced (DeltaAUC, -1.0 +/- 0.3 mmol x l(-1) x h(-1), P < 0.001), representing an approximately 30% decrease relative to placebo. Beta-cell function as assessed by the ISR AUC(0-2 h)/glucose AUC(0-2 h) was significantly increased (+6.4 +/- 2.0 pmol x min(-1) x m(-2) x mmol x l(-1), P = 0.002). Adverse event profiles were similar in the two treatment groups, and no hypoglycemia was reported. CONCLUSIONS: The known effects of vildagliptin on incretin levels and islet function in type 2 diabetes were reproduced in subjects with IGT, with a 32% reduction in postprandial glucose excursions and no evidence of hypoglycemia or weight gain.