CLINICAL PHARMACOLOGY
Mechanism Of Action
TANZEUM is an agonist of the
GLP-1 receptor and augments glucose-dependent insulin secretion. TANZEUM also
slows gastric emptying.
Pharmacodynamics
TANZEUM lowers fasting glucose
and reduces postprandial glucose excursions in patients with type 2 diabetes
mellitus. The majority of the observed reduction in fasting plasma glucose
occurs after a single dose, consistent with the pharmacokinetic profile of
albiglutide. In a Phase II trial in Japanese patients with type 2 diabetes
mellitus who received TANZEUM 30 mg, a reduction (22%) in postprandial glucose
AUC(0-3 h) was observed at steady state (Week 16) compared with placebo
following a mixed meal.
A single dose of TANZEUM 50 mg
subcutaneous (SC) did not impair glucagon response to low glucose
concentrations.
Gastric Motility
TANZEUM slowed gastric emptying
compared with placebo for both solids and liquids when albiglutide 100 mg (2
times the maximum approved dosage) was administered as a single dose in healthy
subjects.
Cardiac Electrophysiology
At doses up to the maximum recommended dose (50 mg),
TANZEUM does not prolong QTc to any clinically relevant extent.
Pharmacokinetics
Absorption
Following SC administration of a single 30-mg dose to
subjects with type 2 diabetes mellitus, maximum concentrations of albiglutide
were reached at 3 to 5 days post-dosing. The mean peak concentration (Cmax) and
mean area under the time-concentration curve (AUC) of albiglutide were 1.74
mcg/mL and 465 mcg.h/mL, respectively, following a single dose of 30 mg
albiglutide in subjects with type 2 diabetes mellitus. Steady-state exposures
are achieved following 4 to 5 weeks of once-weekly administration. Exposures at
the 30-mg and 50-mg dose levels were consistent with a dose-proportional
increase. Similar exposure is achieved with SC administration of albiglutide in
the abdomen, thigh, or upper arm. The absolute bioavailability of albiglutide
following SC administration has not been evaluated.
Distribution
The mean estimate of apparent volume of distribution of
albiglutide following SC administration is 11 L. As albiglutide is an albumin
fusion molecule, plasma protein binding has not been assessed.
Metabolism
Albiglutide is a protein for which the expected metabolic
pathway is degradation to small peptides and individual amino acids by
ubiquitous proteolytic enzymes. Classical biotransformation studies have not
been performed. Because albiglutide is an albumin fusion protein, it likely
follows a metabolic pathway similar to native human serum albumin which is
catabolized primarily in the vascular endothelium.
Elimination
The mean apparent clearance of albiglutide is 67 mL/h with
an elimination half-life of approximately 5 days, making albiglutide suitable
for once-weekly administration.
Specific Populations
Age, Gender, Race, And Body Weight
Based on the population pharmacokinetic analysis with
data collected from 1,113 subjects, age, gender, race, and body weight had no
clinically relevant effect on the pharmacokinetics of albiglutide.
Pediatric Patients
No pharmacokinetic data are available in pediatric
patients.
Patients With Renal Impairment
In a population pharmacokinetic analysis including a
Phase III trial in patients with mild, moderate, and severe renal impairment,
exposures were increased by approximately 30% to 40% in severe renal impairment
compared with those observed in type 2 diabetic patients with normal renal function.
Patients With Hepatic Impairment
No clinical trials were conducted to examine the effects
of mild, moderate, or severe hepatic impairment on the pharmacokinetics of
albiglutide.
Therapeutic proteins such as albiglutide are catabolized
by widely distributed proteolytic enzymes, which are not restricted to hepatic
tissue; therefore, changes in hepatic function are unlikely to have any effect
on the elimination of albiglutide.
Drug Interaction Studies
In multiple-dose, drug-drug interaction trials no
significant change in systemic exposures of the coadministered drugs were
observed, except simvastatin (see Table 3). When albiglutide was coadministered
with simvastatin, Cmax of simvastatin and its active metabolite simvastatin
acid was increased by approximately 18% and 98%, respectively. In the same
trial, AUC of simvastatin decreased by 40% and AUC of simvastatin acid
increased by 36%. Clinical relevance of these changes has not been established
(see Table 3).
Additionally, no clinically relevant pharmacodynamic
effects on luteinizing hormone, follicle-stimulating hormone, or progesterone
were observed when albiglutide and a combination oral contraceptive were
coadministered. Albiglutide did not significantly alter the pharmacodynamic
effects of warfarin as measured by the international normalized ratio (INR).
Table 3: Effect of Albiglutide on Systemic Exposure of
Coadministered Drugs
Coadministered Drug |
Dose of Coadministered Druga |
Dose of TANZEUM |
Geometric Mean Ratio (Ratio +/- Coadministered Drug) No Effect = 1 |
Analyte |
AUC (90% CI)b |
Cmax (90% CI) |
No dose adjustments of coadministered drug required for the following: |
Simvastatin |
80 mg |
50 mg qw for 5 weeks |
Simvastatin |
0.60 (0.52 - 0.69) |
1.18 (1.02 - 1.38) |
Simvastatin acid |
1.36 (1.19 - 1.55) |
1.98 (1.75 - 2.25) |
Digoxin |
0.5 mg |
50 mg qw for 5 weeks |
Digoxin |
1.09 (1.01 - 1.18) |
1.11 (0.98 - 1.26) |
Oral contraceptivec |
0.035 mg ethinyl estradiol and 0.5 mg norethindrone |
50 mg qw for 4 weeks |
Norethindrone |
1.00 (0.96 - 1.04) |
1.04 (0.98 - 1.10) |
Levonorgestrel |
1.09 (1.06 - 1.14) |
1.20 (1.11 - 1.29) |
Warfarin |
25 mg |
50 mg qw for 5 weeks |
R-Warfarin |
1.02 (0.98 - 1.07) |
0.94 (0.89 - 0.99) |
S-Warfarin |
0.99 (0.95 - 1.03) |
0.93 (0.87 - 0.98) |
qw = Once weekly.
a Single dose unless otherwise noted.
b AUCinf for drugs given as a single dose and AUC24h for drugs given
as multiple doses.
c Subjects received low-dose oral contraceptive for two 28-day
treatment cycles (21 days active/7 days placebo). |
Clinical Studies
TANZEUM has been studied as monotherapy and in
combination with metformin, metformin and a sulfonylurea, a thiazolidinedione
(with and without metformin), and insulin glargine (with or without oral
anti-diabetic drugs). The efficacy of TANZEUM was compared with placebo,
glimepiride, pioglitazone, liraglutide, sitagliptin, insulin lispro, and
insulin glargine.
Trials evaluated the use of TANZEUM 30 mg and 50 mg. Five
of the 8 trials allowed optional uptitration of TANZEUM from 30 mg to 50 mg if
glycemic response with 30 mg was inadequate.
In patients with type 2 diabetes mellitus, TANZEUM
produced clinically relevant reduction from baseline in HbA1c compared with
placebo. No overall differences in glycemic effectiveness or body weight were observed
across demographic subgroups (age, gender, race/ethnicity, duration of
diabetes).
Monotherapy
The efficacy of TANZEUM as monotherapy was evaluated in a
52-week, randomized, double-blind, placebo-controlled, multicenter trial. In
this trial, 296 patients with type 2 diabetes inadequately controlled on diet
and exercise were randomized (1:1:1) to TANZEUM 30 mg SC once weekly, TANZEUM
30 mg SC once weekly uptitrated to 50 mg once weekly at Week 12, or placebo.
The mean age of participants was 53 years, 55% of patients were men, the mean
duration of diabetes was 4 years, and the mean baseline eGFR was 84 mL/min/1.73
m². Primary and secondary efficacy results are presented in Table 4. Figure 1
shows the mean adjusted changes in HbA1c from baseline across study visits.
Compared with placebo, treatment with TANZEUM 30 mg or 50
mg resulted in statistically significant reductions in HbA1c from baseline at
Week 52 (see Table 4). The adjusted mean change in weight from baseline did not
differ significantly between TANZEUM (-0.4 to -0.9 kg) and placebo (-0.7 kg) at
Week 52.
Table 4: Results at Week 52 (LOCFa)
in a Trial of TANZEUM as Monotherapy
|
Placebo |
TANZEUM 30 mg Weekly |
TANZEUM 50 mg Weekly |
ITTa (n) |
99 |
100 |
97 |
HbA1c (%) |
Baseline (mean) |
8.0 |
8.1 |
8.2 |
Change at Week 52b |
+0.2 |
-0.7 |
-0.9 |
Difference from placebob (95% CI) |
|
-0.8
(-1.1, -0.6)c |
-1.0
(-1.3, -0.8)c |
Patients (%) achieving HbA1c <7% |
21 |
49 |
40 |
FPG (mg/dL) |
Baseline (mean) |
163 |
164 |
171 |
Change at Week 52b |
+18 |
-16 |
-25 |
Difference from placebob (95% CI) |
|
-34
(-46, -22)c |
-43
(-55, -31)c |
a Intent-to-treat population. Last observation
carried forward (LOCF) was used to impute missing data. Data post-onset of
rescue therapy are treated as missing. At Week 52, primary efficacy data was
imputed for 63%, 34%, and 41% of individuals randomized to placebo, TANZEUM 30
mg, and TANZEUM 50 mg, respectively.
b Least squares mean adjusted for baseline value and stratification
factors.
c P <0.0001 for treatment difference. |
Figure 1: Mean HbA1c Change from Baseline (ITT
Population-LOCF) in a Trial of TANZEUM as Monotherapy
Combination Therapy
Add-On To Metformin
The efficacy of TANZEUM was
evaluated in a 104-week randomized, double-blind, multicenter trial in 999
patients with type 2 diabetes mellitus inadequately controlled on background
metformin therapy (≥1,500 mg daily). In this trial, TANZEUM 30 mg SC
weekly (with optional uptitration to 50 mg weekly after a minimum of 4 weeks)
was compared with placebo, sitagliptin 100 mg daily, or glimepiride 2 mg daily
(with optional titration to 4 mg daily). The mean age of participants
was 55 years, 48% of patients were men, the mean duration of type 2 diabetes
was 6 years, and the mean baseline eGFR was 86 mL/min/1.73 m². Results of the
primary and secondary analyses are presented in Table 5. Figure 2 shows the
mean adjusted changes in HbA1c across study visits.
Reduction in HbA1c from baseline achieved with TANZEUM
was significantly greater than HbA1c reduction achieved with placebo,
sitagliptin, and glimepiride at Week 104 (see Table 5). The difference in body
weight change from baseline between TANZEUM and glimepiride was significant at
Week 104.
Table 5: Results at Week 104 (LOCFa)
in a Trial Comparing TANZEUM with Placebo as Add-On Therapy in Patients
Inadequately Controlled on Metformin
|
TANZEUM + Metformin |
Placebo+ Metformin |
Sitagliptin + Metformin |
Glimepiride + Metformin |
ITTa (n) |
297 |
100 |
300 |
302 |
HbA1c (%) |
Baseline (mean) |
8.1 |
8.1 |
8.1 |
8.1 |
Change at Week 104b |
-0.6 |
+0.3 |
-0.3 |
-0.4 |
Difference from placebo + metforminb (95% CI) |
-0.9
(-1.16, -0.65)c |
|
|
|
Difference from sitagliptin + metforminb (95% CI) |
-0.4
(-0.53, -0.17)c |
|
|
|
Difference from glimepiride + metforminb (95% CI) |
-0.3
(-0.45, -0.09)c |
|
|
|
Proportion achieving HbA1c <7% |
39 |
16 |
32 |
31 |
FPG (mg/dL) |
Baseline (mean) |
165 |
162 |
165 |
168 |
Change at Week 104b |
-18 |
+10 |
-2 |
-8 |
Difference from placebo + metforminb (95% CI) |
-28
(-39, -16)c |
|
|
|
Difference from sitagliptin + metforminb (95% CI) |
-16 (-24, -8)c |
|
|
|
Difference from glimepiride + metforminb (95% CI) |
-10
(-18, -2)c |
|
|
|
Body Weight (kg) |
Baseline (mean) |
90 |
92 |
90 |
92 |
Change at Week 104 b |
-1.2 |
-1.0 |
-0.9 |
+1.2 |
Difference from placebo + metforminb (95% CI) |
-0.2
(-1.1, 0.7) |
|
|
|
Difference from sitagliptin + metforminb (95% CI) |
-0.4
(-1.0, 0.3) |
|
|
|
Difference from glimepiride + metforminb (95% CI) |
-2.4
(-3.0, -1.7)c |
|
|
|
a Intent-to-treat population. Last observation
carried forward (LOCF) was used to impute missing data. Data post-onset of
rescue therapy are treated as missing. At Week 104, primary efficacy data was
imputed for 76%, 46%, 55%, and 51% of individuals randomized to placebo,
TANZEUM, sitagliptin, and glimepiride, respectively.
b Least squares mean adjusted for baseline value and stratification
factors.
c P <0.0137 for treatment difference. |
Figure 2: Mean HbA1c over Time (ITT Population-LOCF) in a Trial Comparing TANZEUM with Placebo as Add-On
Therapy in Patients Inadequately Controlled on Metformin
Add-On To Pioglitazone
The efficacy of TANZEUM was evaluated in a 52-week
randomized, double-blind, multicenter trial in 299 patients with type 2
diabetes mellitus inadequately controlled on pioglitazone ≥30 mg daily
(with or without metformin ≥1,500 mg daily). Patients were randomized to
receive TANZEUM 30 mg SC weekly or placebo. The mean age of participants was 55
years, 60% of patients were men, the mean duration of type 2 diabetes was 8
years, and the mean baseline eGFR was 83 mL/min/1.73 m². Results of the primary
and secondary analyses are presented in Table 6.
Compared with placebo,
treatment with TANZEUM resulted in a statistically significant reduction in
HbA1c from baseline at Week 52 (see Table 6). The adjusted mean change from
baseline in weight did not differ significantly between TANZEUM (+0.3 kg) and
placebo (+0.5 kg) at Week 52.
Table 6: Results at Week 52 (LOCFa)
in a Trial Comparing TANZEUM with Placebo as Add-On Therapy in Patients
Inadequately Controlled on Pioglitazone (with or without Metformin)
|
TANZEUM + Pioglitazone (with or without Metformin) |
Placebo + Pioglitazone (with or without Metformin) |
ITTa (n) |
150 |
149 |
HbA1c (%) |
Baseline (mean) |
8.1 |
8.1 |
Change at Week 52b |
-0.8 |
-0.1 |
Difference from placebo + pioglitazoneb (95% CI) |
-0.8
(-0.95, -0.56)c |
|
Proportion Achieving HbA1c <7% |
44 |
15 |
FPG (mg/dL) |
Baseline (mean) |
165 |
167 |
Change at Week 52b |
-23 |
+6 |
Difference from placebo + pioglitazoneb (95% CI) |
-30
(-39, -20)c |
|
a Intent-to-treat population. Last observation
carried forward (LOCF) was used to impute missing data. Data post-onset of
rescue therapy are treated as missing. At Week 52, primary efficacy data was
imputed for 58% and 32% of individuals randomized to placebo and TANZEUM,
respectively.
b Least squares mean adjusted for baseline value and stratification
factors.
c P <0.0001 for treatment difference. |
Add-On To Metformin Plus Sulfonylurea
The efficacy of TANZEUM was evaluated in a 52-week
randomized, double-blind, multicenter trial in 657 patients with type 2
diabetes mellitus inadequately controlled on metformin (≥1,500 mg daily)
and glimepiride (4 mg daily). Patients were randomized to receive TANZEUM 30 mg
SC weekly (with optional uptitration to 50 mg weekly after a minimum of 4
weeks), placebo, or pioglitazone 30 mg daily (with optional titration to 45
mg/day). The mean age of participants was 55 years, 53% of patients were men,
the mean duration of type 2 diabetes was 9 years, and the mean baseline eGFR was
84 mL/min/1.73 m². Results of the primary and main secondary analyses are
presented in Table 7.
Treatment with TANZEUM resulted in statistically
significant reductions in HbA1c from baseline compared with placebo (see Table
7). Treatment with TANZEUM did not meet the prespecified, non-inferiority
margin (0.3%) against pioglitazone. In this trial, TANZEUM provided less HbA1c
reduction than pioglitazone and the treatment difference was statistically
significant (see Table 7). The change from baseline in body weight for TANZEUM
did not differ significantly from placebo but was significantly different
compared with pioglitazone (see Table 7).
Table 7: Results at Week 52 (LOCFa)
in a Trial Comparing TANZEUM with Placebo as Add-On Therapy in Patients
Inadequately Controlled on Metformin plus Sulfonylurea
|
TANZEUM + Metformin + Glimepiride |
Placebo + Metformin + Glimepiride |
Pioglitazone + Metformin + Glimepiride |
ITTa (n) |
269 |
115 |
273 |
HbA1c (%) |
Baseline (mean) |
8.2 |
8.3 |
8.3 |
Change at Week 52b |
-0.6 |
+0.3 |
-0.8 |
Difference from placebo + met + glimb (95% CI) |
-0.9
(-1.07, -0.68)c |
|
|
Difference from pioglitazone + met + glimb (95% CI) |
0.25
(0.10, 0.40)d |
|
|
Proportion achieving HbA1c <7% |
30 |
9 |
35 |
FPG (mg/dL) |
Baseline (mean) |
171 |
174 |
177 |
Change at Week 52b |
-12 |
+12 |
-31 |
Difference from placebo + met + glimb (95% CI) |
-24
(-34, -14)c |
|
|
Difference from pioglitazone + met + glimb (95% CI) |
19
(11, 27)c |
|
|
Body Weight (kg) |
Baseline (mean) |
91 |
90 |
91 |
Change at Week 52b |
-0.4 |
-0.4 |
+4.4 |
Difference from placebo + met + glimb (95% CI) |
-0.0
(-0.9, 0.8) |
|
|
Difference from pioglitazone + met + glimb (95% CI) |
-4.9
(-5.5, -4.2)c |
|
|
a Intent-to-treat population. Last observation
carried forward (LOCF) was used to impute missing data. Data post-onset of
rescue therapy are treated as missing. At Week 52, primary efficacy data was
imputed for 70%, 35%, and 34% of individuals randomized to placebo, TANZEUM,
and pioglitazone, respectively.
b Least squares mean adjusted for baseline value and stratification
factors.
c P <0.0001 for treatment difference.
d Did not meet non-inferiority margin of 0.3%. |
Combination Therapy: Active-Controlled Trial Versus Liraglutide
The efficacy of TANZEUM was evaluated in a 32-week,
randomized, open-label, liraglutidecontrolled, non-inferiority trial in 805
patients with type 2 diabetes mellitus inadequately controlled on monotherapy
or combination oral antidiabetic therapy (metformin, thiazolidinedione,
sulfonylurea, or a combination of these). Patients were randomized to TANZEUM
30 mg SC weekly (with uptitration to 50 mg weekly at Week 6) or liraglutide 1.8
mg daily (titrated up from 0.6 mg at Week 1, and from 1.2 mg at Week 2). The
mean age of participants was 56 years, 50% of patients were men, the mean
duration of type 2 diabetes was 8 years, and the mean baseline eGFR was 95
mL/min/1.73 m². Results of the primary and main secondary analyses are
presented in Table 8.
The between-treatment
difference of 0.2% with 95% confidence interval (0.08, 0.34) between TANZEUM
and liraglutide did not meet the pre-specified, non-inferiority margin (0.3%).
In this trial, TANZEUM provided less HbA1c reduction than liraglutide and the
treatment difference was statistically significant (see Table 8).
Table 8: Results of Controlled Trial of TANZEUM versus
Liraglutide at Week 32 (LOCFa)
|
TANZEUM |
Liraglutide |
ITTa (n) |
402 |
403 |
HbA1c (%) |
Baseline (mean) |
8.2% |
8.2% |
Change at Week 32b |
-0.8 |
-1.0 |
Difference from liraglutideb (95% CI) |
0.2 (0.08, 0.34)c |
|
Proportion achieving HbA1c <7% |
42% |
52% |
FPG (mg/dL) |
Baseline (mean) |
169 |
167 |
Change at Week 32b |
-22 |
-30 |
Difference from liraglutideb (95% CI) |
8 (3, 14)d |
|
Body Weight (kg) |
Baseline (mean) |
92 |
93 |
Change at Week 32b |
-0.6 |
-2.2 |
Difference from liraglutideb (95% CI) |
1.6 (1.1, 2.1)d |
|
a Intent-to-treat population. Last observation
carried forward (LOCF) was used to impute missing data. Data post-onset of
rescue therapy are treated as missing. At Week 32, primary efficacy data was
imputed for 31% and 24% of individuals randomized to TANZEUM and liraglutide,
respectively.
b Least squares mean adjusted for baseline value and stratification
factors.
c Did not meet non-inferiority margin of 0.3%.
d P <0.005 for treatment difference in favor of liraglutide. |
Combination Therapy: Active-Controlled Trial Versus Basal
Insulin
The efficacy of TANZEUM was evaluated in a 52-week,
randomized (2:1), open-label, insulin glargine-controlled, non-inferiority
trial in 735 patients with type 2 diabetes mellitus inadequately controlled on
metformin ≥1,500 mg daily (with or without sulfonylurea). Patients were
randomized to receive TANZEUM 30 mg SC weekly (with optional uptitration to 50
mg weekly) or insulin glargine (median starting dose of 10 units and titrated
weekly per prescribing information). The primary endpoint was change in HbA1c
from baseline compared with insulin glargine. The starting total daily dose of
insulin glargine ranged between 2 and 40 units (median daily dose of 10 units)
and ranged between 3 and 230 units (median daily dose of 30 units) at Week 52.
Sixty-nine percent of patients treated with TANZEUM were uptitrated to 50 mg SC
weekly. The mean age of participants was 56 years, 56% of patients were men,
the mean duration of type 2 diabetes was 9 years, and the mean baseline eGFR
was 85 mL/min/1.73 m². Results of the primary and main secondary analyses are
presented in Table 9.
The between-treatment difference of 0.1% with 95%
confidence interval (-0.04%, 0.27%) for TANZEUM and insulin glargine met the
pre-specified, non-inferiority margin (0.3%). A mean decrease in body weight
was observed for TANZEUM compared with a mean increase in body weight for
insulin glargine, and the difference in weight change was statistically
significant (see Table 9).
Table 9: Results at Week 52 (LOCFa)
in a Trial Comparing TANZEUM with Insulin Glargine as Add-On Therapy in
Patients Inadequately Controlled on Metformin ± Sulfonylurea
|
TANZEUM + Metformin (with or without Sulfonylurea) |
Insulin Glargine + Metformin (with or without Sulfonylurea) |
ITTa (n) |
496 |
239 |
HbA1c (%) |
Baseline (mean) |
8.3 |
8.4 |
Change at Week 52b |
-0.7 |
-0.8 |
Difference from insulin glargineb (95% CI) |
0.1 (-0.04, 0.27)c |
|
Proportion achieving HbA1c <7% |
32 |
33 |
FPG (mg/dL) |
Baseline (mean) |
169 |
175 |
Change at Week 52b |
-16 |
-37 |
Difference from insulin glargineb (95% CI) |
21 (14, 29)d |
|
Body Weight (kg) |
Baseline (mean) |
95 |
95 |
Change at Week 52b |
-1.1 |
1.6 |
Difference from insulin glargineb (95% CI) |
-2.6 (-3.2, -2.0)e |
|
a Intent-to-treat population. Last observation
carried forward (LOCF) was used to impute missing data. Data post-onset of
rescue therapy are treated as missing. At Week 52, primary efficacy data was
imputed for 41% and 36% of individuals randomized to TANZEUM and insulin
glargine, respectively.
b Least squares mean adjusted for baseline value and stratification
factors.
c Met non-inferiority margin of 0.3%.
d P <0.0001 in favor of insulin glargine.
e P <0.0001. |
Figure 3: Mean HbA1c Change from Baseline (Completers)
in a Trial Comparing TANZEUM with Insulin Glargine as Add-On Therapy in
Patients Inadequately Controlled on Metformin (with or without a Sulfonylurea)
Combination Therapy:
Active-Controlled Trial Versus Prandial Insulin
The efficacy of TANZEUM was evaluated in a 26-week,
randomized, open-label, multicenter, non-inferiority trial in 563 patients with
type 2 diabetes mellitus inadequately controlled on insulin glargine (≥20
units per day). Patients were randomized to receive TANZEUM 30 mg SC once
weekly (with uptitration to 50 mg if inadequately controlled after Week 8) or
insulin lispro (administered daily at meal times, started according to standard
of care and titrated to effect). At Week 26, the mean daily dose of insulin
glargine was 53 IU for TANZEUM and 51 IU for insulin lispro. The mean daily
dose of insulin lispro at Week 26 was 31 IU, and 51% of patients treated with
TANZEUM were on 50 mg weekly. The mean age of participants was 56 years, 47% of
patients were men, the mean duration of type 2 diabetes was 11 years, and the
mean baseline eGFR was 91 mL/min/1.73 m². Results of the primary and main
secondary analyses are presented in Table 10. Figure 4 shows the mean adjusted
changes in HbA1c from baseline across study visits.
The between-treatment
difference of -0.2% with 95% confidence interval (-0.32%, 0.00%) between
albiglutide and insulin lispro met the pre-specified non-inferiority margin
(0.4%). Treatment with TANZEUM resulted in a mean weight loss for TANZEUM
compared with a mean weight gain for insulin lispro, and the difference between
treatment groups was statistically significant (see Table 10).
Table 10: Results at Week 26 (LOCFa)
in a Trial Comparing TANZEUM with Insulin Lispro as Add-On Therapy in Patients
Inadequately Controlled on Insulin Glargine
|
TANZEUM + Insulin Glargine |
Insulin Lispro + Insulin Glargine |
ITTa (n) |
282 |
281 |
HbA1c (%) |
Baseline (mean) |
8.5 |
8.4 |
Change at Week 26b |
-0.8 |
-0.7 |
Difference from insulin lisprob (95% CI) |
-0.2
(-0.32, 0.00)c |
|
Proportion achieving HbA1c <7% |
30% |
25% |
FPG (mg/dL) |
Baseline (mean) |
153 |
153 |
Change at Week 26b |
-18 |
-13 |
Difference from insulin lisprob (95% CI) |
-5 (-13, 3) |
|
Body Weight (kg) |
Baseline (mean) |
93 |
92 |
Change at Week 26b |
-0.7 |
+0.8 |
Difference from insulin lisprob (95% CI) |
-1.5 (-2.1, -1.0)d |
|
a Intent-to-treat population. Last observation
carried forward (LOCF) was used to impute missing data. Data post-onset of
rescue therapy are treated as missing. At Week 26, primary efficacy data was
imputed for 29% and 29% of individuals randomized to TANZEUM and insulin
lispro, respectively.
b Least squares mean adjusted for baseline value and stratification
factors.
c Rules out a non-inferiority margin of 0.4%.
d P <0.0001 for treatment difference. |
Figure 4: Mean HbA1c Change from Baseline (ITT-LOCF
population) in a Trial Comparing TANZEUM with Insulin Lispro as Add-On Therapy
in Patients Inadequately Controlled on Insulin Glargine
Type 2 Diabetes Mellitus
Patients With Renal Impairment
The efficacy of TANZEUM was evaluated in a 26-week,
randomized, double-blind, active-controlled trial in 486 patients with mild (n
= 250), moderate (n = 200), and severe renal impairment (n = 36) inadequately
controlled on a current regimen of diet and exercise or other antidiabetic
therapy. Patients were randomized to receive TANZEUM 30 mg SC weekly (with
uptitration to 50 mg weekly if needed as early as Week 4) or sitagliptin. Sitagliptin
was dosed according to renal function (100 mg, 50 mg, and 25 mg daily in mild,
moderate, and severe renal impairment, respectively). The mean age of
participants was 63 years, 54% of patients were men, the mean duration of type
2 diabetes was 11 years, and the mean baseline eGFR was 60 mL/min/1.73 m².
Results of the primary and main
secondary analyses are presented in Table 11. Treatment with TANZEUM resulted
in statistically significant reductions in HbA1c from baseline at Week 26
compared with sitagliptin (see Table 11).
Table 11: Results at Week 26 (LOCFa)
in a Trial Comparing TANZEUM with Sitagliptin in Patients with Renal Impairment
|
TANZEUM |
Sitagliptin |
ITTa (n) |
246 |
240 |
HbA1c (%) |
Baseline (mean) |
8.1 |
8.2 |
Change at Week 26b |
-0.8 |
-0.5 |
Difference from sitagliptinb (95% CI) |
-0.3
(-0.49, -0.15)c |
|
Proportion achieving HbA1c <7% |
43% |
31% |
FPG (mg/dL) |
Baseline (mean) |
166 |
165 |
Change at Week 26b |
-26 |
-4 |
Difference from sitagliptinb (95% CI) |
-22 (-31, -13)c |
|
Body Weight (kg) |
Baseline (mean) |
84 |
83 |
Change at Week 26b |
-0.8 |
-0.2 |
Difference from sitagliptinb (95% CI) |
-0.6 (-1.1, -0.1)d |
|
a Intent-to-treat population. Last observation
carried forward (LOCF) was used to impute missing data. Data post-onset of
rescue therapy are treated as missing. At Week 26 primary efficacy data was
imputed for 17% and 25% of individuals randomized to TANZEUM and sitagliptin,
respectively.
b Least squares mean adjusted for baseline value and stratification
factors.
c P <0.0003 for treatment difference.
d P = 0.0281 for treatment
difference. |