CLINICAL PHARMACOLOGY
Mechanism Of Action
Liraglutide is an acylated human Glucagon-Like Peptide-1
(GLP-1) receptor agonist with 97% amino acid sequence homology to endogenous
human GLP-1(7-37). GLP-1(7-37) represents <20% of total circulating
endogenous GLP-1. Like GLP-1(7-37), liraglutide activates the GLP-1 receptor, a
membranebound cell-surface receptor coupled to adenylyl cyclase by the stimulatory
G-protein, Gs, in pancreatic beta cells. Liraglutide increases intracellular
cyclic AMP (cAMP) leading to insulin release in the presence of elevated
glucose concentrations. This insulin secretion subsides as blood glucose concentrations
decrease and approach euglycemia. Liraglutide also decreases glucagon secretion
in a glucose-dependent manner. The mechanism of blood glucose lowering also
involves a delay in gastric emptying.
GLP-1(7-37) has a half-life of 1.5-2 minutes due to
degradation by the ubiquitous endogenous enzymes, dipeptidyl peptidase IV
(DPP-IV) and neutral endopeptidases (NEP). Unlike native GLP-1, liraglutide is stable
against metabolic degradation by both peptidases and has a plasma half-life of
13 hours after subcutaneous administration. The pharmacokinetic profile of
liraglutide, which makes it suitable for once daily administration, is a result
of self-association that delays absorption, plasma protein binding and stability
against metabolic degradation by DPP-IV and NEP.
Pharmacodynamics
VICTOZA’s pharmacodynamic profile is consistent with its
pharmacokinetic profile observed after single subcutaneous administration as
VICTOZA lowered fasting, premeal and postprandial glucose throughout the day [see
Pharmacokinetics].
Fasting and postprandial glucose was measured before and
up to 5 hours after a standardized meal after treatment to steady state with
0.6, 1.2 and 1.8 mg VICTOZA or placebo. Compared to placebo, the postprandial
plasma glucose AUC0-300min was 35% lower after VICTOZA 1.2 mg and 38% lower
after VICTOZA 1.8 mg.
Glucose-Dependent Insulin Secretion
The effect of a single dose of 7.5 mcg/kg (~ 0.7 mg)
VICTOZA on insulin secretion rates (ISR) was investigated in 10 patients with
type 2 diabetes during graded glucose infusion. In these patients, on average,
the ISR response was increased in a glucose-dependent manner (Figure 2).
Figure 2 : Mean Insulin Secretion Rate (ISR) versus
Glucose Concentration Following Single-Dose VICTOZA 7.5 mcg/kg (~ 0.7 mg) or
Placebo in Patients with Type 2 Diabetes (N=10) During Graded Glucose Infusion
Glucagon Secretion
VICTOZA lowered blood glucose by stimulating insulin
secretion and lowering glucagon secretion. A single dose of VICTOZA 7.5 mcg/kg
(~ 0.7 mg) did not impair glucagon response to low glucose concentrations.
Gastric Emptying
VICTOZA causes a delay of gastric emptying, thereby
reducing the rate at which postprandial glucose appears in the circulation.
Cardiac Electrophysiology (QTc)
The effect of VICTOZA on cardiac repolarization was
tested in a QTc study. VICTOZA at steady state concentrations with daily doses
up to 1.8 mg did not produce QTc prolongation.
Pharmacokinetics
Absorption
Following subcutaneous administration, maximum
concentrations of liraglutide are achieved at 8-12 hours post dosing. The mean
peak (Cmax) and total (AUC) exposures of liraglutide were 35 ng/mL and 960
ng·h/mL, respectively, for a subcutaneous single dose of 0.6 mg. After
subcutaneous single dose administrations, Cmax and AUC of liraglutide increased
proportionally over the therapeutic dose range of 0.6 mg to 1.8 mg. At 1.8 mg
VICTOZA, the average steady state concentration of liraglutide over 24 hours
was approximately 128 ng/mL. AUC0-∞ was equivalent between upper arm and
abdomen, and between upper arm and thigh. AUC0-∞ from thigh was 22% lower
than that from abdomen. However, liraglutide exposures were considered
comparable among these three subcutaneous injection sites. Absolute
bioavailability of liraglutide following subcutaneous administration is
approximately 55%.
Distribution
The mean apparent volume of distribution after
subcutaneous administration of VICTOZA 0.6 mg is approximately 13 L. The mean
volume of distribution after intravenous administration of VICTOZA is 0.07
L/kg. Liraglutide is extensively bound to plasma protein (>98%).
Metabolism
During the initial 24 hours following administration of a
single [3H]-liraglutide dose to healthy subjects, the major component in plasma
was intact liraglutide. Liraglutide is endogenously metabolized in a similar
manner to large proteins without a specific organ as a major route of
elimination.
Elimination
Following a [3H]-liraglutide dose, intact
liraglutide was not detected in urine or feces. Only a minor part of the
administered radioactivity was excreted as liraglutide-related metabolites in
urine or feces (6% and 5%, respectively). The majority of urine and feces
radioactivity was excreted during the first 6-8 days. The mean apparent
clearance following subcutaneous administration of a single dose of liraglutide
is approximately 1.2 L/h with an elimination half-life of approximately 13
hours, making VICTOZA suitable for once daily administration.
Specific Populations
Elderly
Age had no effect on the pharmacokinetics of VICTOZA
based on a pharmacokinetic study in healthy elderly subjects (65 to 83 years)
and population pharmacokinetic analyses of patients 18 to 80 years of age [see Use
In Specific Populations].
Gender
Based on the results of population pharmacokinetic
analyses, females have 25% lower weightadjusted clearance of VICTOZA compared
to males. Based on the exposure response data, no dose adjustment is necessary
based on gender.
Race And Ethnicity
Race and ethnicity had no effect on the pharmacokinetics
of VICTOZA based on the results of population pharmacokinetic analyses that
included Caucasian, Black, Asian and Hispanic/Non- Hispanic subjects.
Body Weight
Body weight significantly affects the pharmacokinetics of
VICTOZA based on results of population pharmacokinetic analyses. The exposure
of liraglutide decreases with an increase in baseline body weight. However, the
1.2 mg and 1.8 mg daily doses of VICTOZA provided adequate systemic exposures
over the body weight range of 40 – 160 kg evaluated in the clinical trials.
Liraglutide was not studied in patients with body weight >160 kg.
Pediatric
A population pharmacokinetic analysis was conducted for
VICTOZA using data from 72 pediatric subjects (10 to 17 years of age) with type
2 diabetes. The pharmacokinetic profile of VICTOZA in the pediatric subjects
was consistent with that in adults.
Renal Impairment
The single-dose pharmacokinetics of VICTOZA were
evaluated in subjects with varying degrees of renal impairment. Subjects with
mild (estimated creatinine clearance 50-80 mL/min) to severe (estimated
creatinine clearance <30 mL/min) renal impairment and subjects with
end-stage renal disease requiring dialysis were included in the trial. Compared
to healthy subjects, liraglutide AUC in mild, moderate, and severe renal
impairment and in end-stage renal disease was on average 35%, 19%, 29% and 30%
lower, respectively [see Use In Specific Populations].
Hepatic Impairment
The single-dose pharmacokinetics of VICTOZA were
evaluated in subjects with varying degrees of hepatic impairment. Subjects with
mild (Child Pugh score 5-6) to severe (Child Pugh score > 9) hepatic
impairment were included in the trial. Compared to healthy subjects,
liraglutide AUC in subjects with mild, moderate and severe hepatic impairment
was on average 11%, 14% and 42% lower, respectively [see Use In Specific
Populations].
Drug Interactions
In Vitro Assessment Of Drug-Drug Interactions
VICTOZA has low potential for pharmacokinetic drug-drug
interactions related to cytochrome P450 (CYP) and plasma protein binding.
In Vivo Assessment Of Drug-Drug Interactions
The drug-drug interaction studies were performed at
steady state with VICTOZA 1.8 mg/day. Before administration of concomitant
treatment, subjects underwent a 0.6 mg weekly dose increase to reach the maximum
dose of 1.8 mg/day. Administration of the interacting drugs was timed so that
Cmax of VICTOZA (8-12 h) would coincide with the absorption peak of the
co-administered drugs.
Digoxin
A single dose of digoxin 1 mg was administered 7 hours
after the dose of VICTOZA at steady state. The concomitant administration with
VICTOZA resulted in a reduction of digoxin AUC by 16%; Cmax decreased by 31%.
Digoxin median time to maximal concentration (Tmax) was delayed from 1 h to 1.5
h.
Lisinopril
A single dose of lisinopril 20 mg was administered 5
minutes after the dose of VICTOZA at steady state. The co-administration with
VICTOZA resulted in a reduction of lisinopril AUC by 15%; Cmax decreased by
27%. Lisinopril median Tmax was delayed from 6 h to 8 h with VICTOZA.
Atorvastatin
VICTOZA did not change the overall exposure (AUC) of
atorvastatin following a single dose of atorvastatin 40 mg, administered 5
hours after the dose of VICTOZA at steady state. Atorvastatin Cmax was
decreased by 38% and median Tmax was delayed from 1 h to 3 h with VICTOZA.
Acetaminophen
VICTOZA did not change the overall exposure (AUC) of
acetaminophen following a single dose of acetaminophen 1000 mg, administered 8
hours after the dose of VICTOZA at steady state. Acetaminophen Cmax was
decreased by 31% and median Tmax was delayed up to 15 minutes.
Griseofulvin
VICTOZA did not change the overall exposure (AUC) of
griseofulvin following co-administration of a single dose of griseofulvin 500
mg with VICTOZA at steady state. Griseofulvin Cmax increased by 37% while
median Tmax did not change.
Oral Contraceptives
A single dose of an oral contraceptive combination
product containing 0.03 mg ethinylestradiol and 0.15 mg levonorgestrel was
administered under fed conditions and 7 hours after the dose of VICTOZA at steady
state. VICTOZA lowered ethinylestradiol and levonorgestrel Cmax by 12% and 13%,
respectively. There was no effect of VICTOZA on the overall exposure (AUC) of
ethinylestradiol. VICTOZA increased the levonorgestrel AUC0-∞ by 18%.
VICTOZA delayed Tmax for both ethinylestradiol and levonorgestrel by 1.5 h.
Insulin Detemir
No pharmacokinetic interaction was observed between
VICTOZA and insulin detemir when separate subcutaneous injections of insulin
detemir 0.5 Unit/kg (single-dose) and VICTOZA 1.8 mg (steady state) were
administered in patients with type 2 diabetes.
Clinical Studies
Glycemic Control Trials In Adults With Type 2 Diabetes
Mellitus
In glycemic control trials, VICTOZA has been studied as
monotherapy and in combination with one or two oral anti-diabetic medications
or basal insulin. VICTOZA was also studied in a cardiovascular outcomes trial
(LEADER trial).
In each of the placebo controlled trials, treatment with
VICTOZA produced clinically and statistically significant improvements in
hemoglobin A1c and fasting plasma glucose (FPG) compared to placebo.
All VICTOZA-treated patients started at 0.6 mg/day. The
dose was increased in weekly intervals by 0.6 mg to reach 1.2 mg or 1.8 mg for
patients randomized to these higher doses. VICTOZA 0.6 mg is not effective for
glycemic control and is intended only as a starting dose to reduce
gastrointestinal intolerance [see DOSAGE AND ADMINISTRATION].
Monotherapy
In this 52-week trial, 746 patients were randomized to
VICTOZA 1.2 mg, VICTOZA 1.8 mg, or glimepiride 8 mg. Patients who were
randomized to glimepiride were initially treated with 2 mg daily for two weeks,
increasing to 4 mg daily for another two weeks, and finally increasing to 8 mg
daily. Treatment with VICTOZA 1.8 mg and 1.2 mg resulted in a statistically
significant reduction in HbA1c compared to glimepiride (Table 3). The
percentage of patients who discontinued due to ineffective therapy was 3.6% in
the VICTOZA 1.8 mg treatment group, 6.0% in the VICTOZA 1.2 mg treatment group,
and 10.1% in the glimepiride-treatment group.
The mean age of participants was 53 years, and the mean
duration of diabetes was 5 years. Participants were 49.7% male, 77.5% White,
12.6% Black or African American and 35.0% of Hispanic ethnicity. The mean BMI
was 33.1 kg/m².
Table 3 : Results of a 52-week monotherapy triala
|
VICTOZA 1.8 mg |
VICTOZA 12 mg |
Glimepiride 8 mg |
Intent-to-Treat Population (N) |
246 |
251 |
248 |
HbA1c (%) (Mean) |
Baseline |
8.2 |
8.2 |
8.2 |
Change from baseline (adjusted mean)b |
-1.1 |
-0.8 |
-0.5 |
Difference from glimepiride arm (adjusted mean)b 95% Confidence Interval |
-0.6**
(-0.8, -0.4) |
-0.3*
(-0.5,-0.1) |
|
Percentage of patients achieving HbA1c <7% |
51 |
43 |
28 |
Fasting Plasma Glucose (mg/dL) (Mean) |
Baseline |
172 |
168 |
172 |
Change from baseline (adjusted mean)b |
-26 |
-15 |
-5 |
Difference from glimepiride arm (adjusted mean)b 95% Confidence Interval |
-20**
(-29, -12) |
-10*
(-19, -1) |
|
Body Weight (kg) (Mean) |
Baseline |
92.6 |
92.1 |
93.3 |
Change from baseline (adjusted mean)b |
-2.5 |
-2.1 |
+1.1 |
Difference from glimepiride arm (adjusted mean)b
95% Confidence Interval |
-3.6**
(-4.3, -2.9) |
-3.2**
(-3.9, -2.5) |
|
aIntent-to-treat population using last
observation on study
bLeast squares mean adjusted for baseline value
*p-value <0.05
**p-value <0.0001 |
Figure 3 : Mean HbA1c for patients who completed the
52-week trial and for the Last Observation Carried Forward (LOCF,
intent-to-treat) data at Week 52 (Monotherapy)
Combination Therapy
Add-On To Metformin
In this 26-week trial, 1091 patients were randomized to
VICTOZA 0.6 mg, VICTOZA 1.2 mg, VICTOZA 1.8 mg, placebo, or glimepiride 4 mg
(one-half of the maximal approved dose in the United States), all as add-on to
metformin. Randomization occurred after a 6-week run-in period consisting of a 3-week
initial forced metformin titration period followed by a maintenance period of
another 3 weeks. During the titration period, doses of metformin were increased
up to 2000 mg/day. Treatment with VICTOZA 1.2 mg and 1.8 mg as add-on to
metformin resulted in a significant mean HbA1c reduction relative to placebo
add-on to metformin and resulted in a similar mean HbA1c reduction relative to glimepiride
4 mg add-on to metformin (Table 4). The percentage of patients who discontinued
due to ineffective therapy was 5.4% in the VICTOZA 1.8 mg + metformin treatment
group, 3.3% in the VICTOZA 1.2 mg + metformin treatment group, 23.8% in the
placebo + metformin treatment group, and 3.7% in the glimepiride + metformin
treated group.
The mean age of participants was 57 years, and the mean
duration of diabetes was 7 years. Participants were 58.2% male, 87.1% White and
2.4% Black or African American. The mean BMI was 31.0 kg/m².
Table 4 : Results of a 26-week trial of VICTOZA as
add-on to metformina
|
VICTOZA 1.8 mg + Metformin |
VICTOZA 1.2 mg + Metformin |
Placebo + Metformin |
Glimepiride 4 mg† + Metformin |
Intent-to-Treat Population (N) |
242 |
240 |
121 |
242 |
HbA1c (%) (Mean) |
Baseline |
8.4 |
8.3 |
8.4 |
8.4 |
Change from baseline (adjusted mean) b |
-1.0 |
-1.0 |
+0.1 |
-1.0 |
Difference from placebo + metformin arm (adjusted mean)b 95% Confidence Interval |
-1 1**
(-1.3, -0.9) |
-1.1**
(-1.3,-0.9) |
|
|
Difference from glimepiride + metformin arm (adjusted mean)b 95% Confidence Interval |
0.0 (-0.2, 0.2) |
0.0 (-0.2, 0.2) |
|
|
Percentage of patients achieving HbA1c <7% |
42 |
35 |
11 |
36 |
Fasting Plasma Glucose (mg/dL) (Mean) |
Baseline |
181 |
179 |
182 |
180 |
Change from baseline (adjusted mean)b |
-30 |
-30 |
+7 |
-24 |
Difference from placebo + metformin arm (adjusted mean)b 95% Confidence Interval |
-38**
(-48, -27) |
-37**
(-47, -26) |
|
|
Difference from glimepiride + metformin arm (adjusted mean)b 95% Confidence Interval |
-7 (-16, 2) |
-6 (-15, 3) |
|
|
Body Weight (kg) (Mean) |
Baseline |
88.0 |
88.5 |
91.0 |
89.0 |
Change from baseline (adjusted mean)b |
-2.8 |
-2.6 |
-1.5 |
+1.0 |
Difference from placebo + metformin arm (adjusted mean)b 95% Confidence Interval |
-1.3*
(-2.2, -0.4) |
-1.1*
(-2.0, -0.2) |
|
|
Difference from glimepiride + metformin arm (adjusted mean)b 95% Confidence Interval |
-3.8**
(-4.5, -3.0) |
-3.5**
(-4.3, -2.8) |
|
|
aIntent-to-treat population using last
observation on study
bLeast squares mean adjusted for baseline value
† For glimepiride, one-half of the maximal approved United States dose.
*p-value <0.05
**p-value <0.0001 |
VICTOZA Compared To Sitagliptin, Both As Add-On To Metformin
In this 26–week, open-label trial, 665 patients on a
background of metformin ≥1500 mg per day were randomized to VICTOZA 1.2
mg once-daily, VICTOZA 1.8 mg once-daily or sitagliptin 100 mg oncedaily, all
dosed according to approved labeling. Patients were to continue their current
treatment on metformin at a stable, pre-trial dose level and dosing frequency.
The mean age of participants was 56 years, and the mean
duration of diabetes was 6 years. Participants were 52.9% male, 86.6% White,
7.2% Black or African American and 16.2% of Hispanic ethnicity. The mean BMI
was 32.8 kg/m².
The primary endpoint was the change in HbA1c from
baseline to Week 26. Treatment with VICTOZA 1.2 mg and VICTOZA 1.8 mg resulted
in statistically significant reductions in HbA1c relative to sitagliptin 100 mg
(Table 5). The percentage of patients who discontinued due to ineffective
therapy was 3.1% in the VICTOZA 1.2 mg group, 0.5% in the VICTOZA 1.8 mg
treatment group, and 4.1% in the sitagliptin 100 mg treatment group. From a
mean baseline body weight of 94 kg, there was a mean reduction of 2.7 kg for
VICTOZA 1.2 mg, 3.3 kg for VICTOZA 1.8 mg, and 0.8 kg for sitagliptin 100 mg.
Table 5: Results of a 26-week open-label trial of
VICTOZA Compared to Sitagliptin (both in combination with metformin)a
|
VICTOZA 1.8 mg + Metformin |
VICTOZA 1.2 mg + Metformin |
Sitagliptin 100 mg + Metformin |
Intent-to-Treat Population (N) |
218 |
221 |
219 |
HbA1c (%) (Mean) |
Baseline |
8.4 |
8.4 |
8.5 |
Change from baseline (adjusted mean) |
-1.5 |
-1.2 |
-0.9 |
Difference from sitagliptin arm (adjusted mean)b 95% Confidence Interval |
-0.6**
(-0.8, -0.4) |
-0.3**
(-0.5, -0.2) |
|
Percentage of patients achieving HbA1c <7% |
56 |
44 |
22 |
Fasting Plasma Glucose (mg/dL) (Mean) |
Baseline |
179 |
182 |
180 |
Change from baseline (adjusted mean) |
-39 |
-34 |
-15 |
Difference from sitagliptin arm (adjusted mean)b 95% Confidence Interval |
-24**
(-31, -16) |
-19**
(-26, -12) |
|
aIntent-to-treat population using last
observation on study
bLeast squares mean adjusted for baseline value
**p-value <0.0001 |
Figure 4 : Mean HbA1c for patients who completed the
26-week trial and for the Last Observation Carried Forward (LOCF,
intent-to-treat) data at Week 26
Combination Therapy With Metformin And Insulin
This 26-week open-label trial enrolled 988 patients with
inadequate glycemic control (HbA1c 7-10%) on metformin (≥1500 mg/day)
alone or inadequate glycemic control (HbA1c 7-8.5%) on metformin (≥1500 mg/day)
and a sulfonylurea. Patients who were on metformin and a sulfonylurea
discontinued the sulfonylurea then all patients entered a 12-week run-in period
during which they received add-on therapy with VICTOZA titrated to 1.8 mg
once-daily. At the end of the run-in period, 498 patients (50%) achieved HbA1c
<7% with VICTOZA 1.8 mg and metformin and continued treatment in a
nonrandomized, observational arm. Another 167 patients (17%) withdrew from the
trial during the run-in period with approximately one-half of these patients
doing so because of gastrointestinal adverse reactions [see ADVERSE
REACTIONS]. The remaining 323 patients with HbA1c ≥7% (33% of those
who entered the run-in period) were randomized to 26 weeks of once-daily
insulin detemir administered in the evening as add-on therapy (N=162) or to
continued, unchanged treatment with VICTOZA 1.8 mg and metformin (N=161). The
starting dose of insulin detemir was 10 units/day and the mean dose at the end of
the 26-week randomized period was 39 units/day. During the 26 week randomized
treatment period, the percentage of patients who discontinued due to
ineffective therapy was 11.2% in the group randomized to continued treatment
with VICTOZA 1.8 mg and metformin and 1.2% in the group randomized to add-on
therapy with insulin detemir.
The mean age of participants was 57 years, and the mean
duration of diabetes was 8 years. Participants were 55.7% male, 91.3% White,
5.6% Black or African American and 12.5% of Hispanic ethnicity. The mean BMI
was 34.0 kg/m².
Treatment with insulin detemir as add-on to VICTOZA 1.8
mg + metformin resulted in statistically significant reductions in HbA1c and
FPG compared to continued, unchanged treatment with VICTOZA 1.8 mg + metformin
alone (Table 6). From a mean baseline body weight of 96 kg after randomization,
there was a mean reduction of 0.3 kg in the patients who received insulin
detemir add-on therapy compared to a mean reduction of 1.1 kg in the patients
who continued on unchanged treatment with VICTOZA 1.8 mg + metformin alone.
Table 6 : Results of a 26-week open label trial of
Insulin detemir as add on to VICTOZA + metformin compared to continued
treatment with VICTOZA + metformin alone in patients not achieving HbA1c <
7% after 12 weeks of Metformin and VICTOZAa
|
Insulin detemir + VICTOZA + Metformin |
VICTOZA + Metformin |
Intent-to-Treat Population (N) |
162 |
157 |
HbA1c (%) (Mean) |
Baseline (week 0) |
7.6 |
7.6 |
Change from baseline (adjusted mean) |
-0.5 |
0 |
Difference from VICTOZA + metformin arm (LS mean) b 95% Confidence Interval |
-0.5**
(-0.7, -0.4) |
|
Percentage of patients achieving HbA1c <7% |
43 |
17 |
Fasting Plasma Glucose (mg/dL) (Mean) |
Baseline (week 0) |
166 |
159 |
Change from baseline (adjusted mean) |
-39 |
-7 |
Difference from VICTOZA + metformin arm (LS mean) b 95% Confidence Interval |
-31**
(-39, -23) |
|
aIntent-to-treat population using last
observation on study
bLeast squares mean adjusted for baseline value
**p-value <0.0001 |
Add-On To Sulfonylurea
In this 26-week trial, 1041 patients were randomized to
VICTOZA 0.6 mg, VICTOZA 1.2 mg, VICTOZA 1.8 mg, placebo, or rosiglitazone 4 mg
(one-half of the maximal approved dose in the United States), all as add-on to
glimepiride. Randomization occurred after a 4-week run-in period consisting of an
initial, 2-week, forced-glimepiride titration period followed by a maintenance
period of another 2 weeks. During the titration period, doses of glimepiride
were increased to 4 mg/day. The doses of glimepiride could be reduced (at the
discretion of the investigator) from 4 mg/day to 3 mg/day or 2 mg/day (minimum)
after randomization, in the event of unacceptable hypoglycemia or other adverse
events.
The mean age of participants was 56 years, and the mean
duration of diabetes was 8 years. Participants were 49.4% male, 64.4% White and
2.8% Black or African American. The mean BMI was 29.9 kg/m².
Treatment with VICTOZA 1.2 mg and 1.8 mg as add-on to
glimepiride resulted in a statistically significant reduction in mean HbA1c
compared to placebo add-on to glimepiride (Table 7). The percentage of patients
who discontinued due to ineffective therapy was 3.0% in the VICTOZA 1.8 mg + glimepiride
treatment group, 3.5% in the VICTOZA 1.2 mg + glimepiride treatment group,
17.5% in the placebo + glimepiride treatment group, and 6.9% in the
rosiglitazone + glimepiride treatment group.
Table 7 : Results of a 26-week trial of VICTOZA as
add-on to sulfonylurea
|
VICTOZA 1.8 mg + Glimepiride |
VICTOZA 1.2 mg + Glimepiride |
Placebo + Glimepiride |
Rosiglitazone 4 mg† + Glimepiride |
Intent-to-Treat Population (N) |
234 |
228 |
114 |
231 |
HbA1c (%) (Mean) |
Baseline |
8.5 |
8.5 |
8.4 |
8.4 |
Change from baseline (adjusted mean) b |
-1.1 |
-1.1 |
+0.2 |
-0.4 |
Difference from placebo + glimepiride arm (adjusted mean) b 95% Confidence Interval |
-1.4**
(-1.6, -1.1) |
-1.3**
(-1.5,-1.1) |
|
|
Percentage of patients achieving HbA1c <7% |
42 |
35 |
7 |
22 |
Fasting Plasma Glucose (mg/dL) (Mean) |
Baseline |
174 |
177 |
171 |
179 |
Change from baseline (adjusted mean) |
-29 |
-28 |
+18 |
-16 |
Difference from placebo + glimepiride arm (adjusted mean)b 95% Confidence Interval |
-47**
(-58, -35) |
-46**
(-58, -35) |
|
|
Body Weight (kg) (Mean) |
Baseline |
83.0 |
80.0 |
81.9 |
80.6 |
Change from baseline (adjusted mean) b |
-0.2 |
+0.3 |
-0.1 |
+2.1 |
Difference from placebo + glimepiride arm (adjusted mean)b 95% Confidence Interval |
-0.1
(-0.9, 0.6) |
0.4
(-0.4, 1.2) |
|
|
aIntent-to-treat population using last
observation on study
bLeast squares mean adjusted for baseline value
† For rosiglitazone, one-half of the maximal approved United States dose.
**p-value <0.0001 |
Add-On To Metformin And Sulfonylurea
In this 26-week trial, 581 patients were randomized to
VICTOZA 1.8 mg, placebo, or insulin glargine, all as add-on to metformin and
glimepiride. Randomization took place after a 6-week run-in period consisting
of a 3-week forced metformin and glimepiride titration period followed by a
maintenance period of another 3 weeks. During the titration period, doses of
metformin and glimepiride were to be increased up to 2000 mg/day and 4 mg/day,
respectively. After randomization, patients randomized to VICTOZA 1.8 mg
underwent a 2 week period of titration with VICTOZA. During the trial, the VICTOZA
and metformin doses were fixed, although glimepiride and insulin glargine doses
could be adjusted. Patients titrated glargine twice-weekly during the first 8
weeks of treatment based on selfmeasured fasting plasma glucose on the day of
titration. After Week 8, the frequency of insulin glargine titration was left
to the discretion of the investigator, but, at a minimum, the glargine dose was
to be revised, if necessary, at Weeks 12 and 18. Only 20% of glargine-treated
patients achieved the prespecified target fasting plasma glucose of ≤100
mg/dL. Therefore, optimal titration of the insulin glargine dose was not
achieved in most patients.
The mean age of participants was 58 years, and the mean
duration of diabetes was 9 years. Participants were 56.5% male, 75.0% White and
3.6% Black or African American. The mean BMI was 30.5 kg/m².
Treatment with VICTOZA as add-on to glimepiride and
metformin resulted in a statistically significant mean reduction in HbA1c
compared to placebo add-on to glimepiride and metformin (Table 8). The percentage
of patients who discontinued due to ineffective therapy was 0.9% in the VICTOZA
1.8 mg + metformin + glimepiride treatment group, 0.4% in the insulin glargine
+ metformin + glimepiride treatment group, and 11.3% in the placebo + metformin
+ glimepiride treatment group.
Table 8 : Results of a 26-week trial of VICTOZA as
add-on to metformin and sulfonylurea
|
VICTOZA 1.8 mg + Metformin + Glimepiride |
Placebo + Metformin + Glimepiride |
Insulin glargine† + Metformin + Glimepiride |
Intent-to-Treat Population (N) |
230 |
114 |
232 |
HbA1c (%) (Mean) |
Baseline |
8.3 |
8.3 |
8.1 |
Change from baseline (adjusted mean) b |
-1.3 |
-0.2 |
-1.1 |
Difference from placebo + metformin + glimepiride arm (adjusted mean) b 95% Confidence Interval |
-1.1**
(-1.3,-0.9) |
|
|
Percentage of patients achieving HbA1c <7% |
53 |
15 |
46 |
Fasting Plasma Glucose (mg/dL) (Mean) |
Baseline |
165 |
170 |
164 |
Change from baseline (adjusted mean)b |
-28 |
+10 |
-32 |
Difference from placebo + metformin + glimepiride arm (adjusted mean) b 95% Confidence Interval |
-38**
(-46, -30) |
|
|
Body Weight (kg) (Mean) |
Baseline |
85.8 |
85.4 |
85.2 |
Change from baseline (adjusted mean) b |
-1.8 |
-0.4 |
1.6 |
Difference from placebo + metformin + glimepiride arm (adjusted mean)b 95% Confidence Interval |
-1.4*
(-2.1, -0.7) |
|
|
aIntent-to-treat population using last
observation on study
bLeast squares mean adjusted for baseline value
† For insulin glargine, optimal titration regimen was not achieved for 80% of
patients.
*p-value <0.05
**p-value <0.0001 |
VICTOZA Compared To Exenatide, Both As Add-On To Metformin
And/Or Sulfonylurea Therapy
In this 26–week, open-label trial, 464 patients on a
background of metformin monotherapy, sulfonylurea monotherapy or a combination
of metformin and sulfonylurea were randomized to once daily VICTOZA 1.8 mg or
exenatide 10 mcg twice daily. Maximally tolerated doses of background therapy
were to remain unchanged for the duration of the trial. Patients randomized to
exenatide started on a dose of 5 mcg twice-daily for 4 weeks and then were
escalated to 10 mcg twice daily.
The mean age of participants was 57 years, and the mean
duration of diabetes was 8 years. Participants were 51.9% male, 91.8% White,
5.4% Black or African American and 12.3% of Hispanic ethnicity. The mean BMI
was 32.9 kg/m².
Treatment with VICTOZA 1.8 mg resulted in statistically
significant reductions in HbA1c and FPG relative to exenatide (Table 9). The percentage
of patients who discontinued for ineffective therapy was 0.4% in the VICTOZA
treatment group and 0% in the exenatide treatment group. Both treatment groups had
a mean decrease from baseline in body weight of approximately 3 kg.
Table 9 : Results of a 26-week open-label trial of
VICTOZA versus Exenatide (both in combination with metformin and/or
sulfonylurea)a
|
VICTOZA 1.8 mg once daily + metformin and/or sulfonylurea |
Exenatide 10 mcg twice daily + metformin and/or sulfonylurea |
Intent-to-Treat Population (N) |
233 |
231 |
HbA1c (%) (Mean) |
Baseline |
8.2 |
8.1 |
Change from baseline (adjusted mean)b |
-1.1 |
-0.8 |
Difference from exenatide arm (adjusted mean) b 95% Confidence Interval |
-0.3**
(-0.5,-0.2) |
|
Percentage of patients achieving HbA1c <7% |
54 |
43 |
Fasting Plasma Glucose (mg/dL) (Mean) |
Baseline |
176 |
171 |
Change from baseline (adjusted mean) b |
-29 |
-11 |
Difference from exenatide arm (adjusted mean)b 95% Confidence Interval |
-18**
(-25, -12) |
|
aIntent-to-treat population using last
observation carried forward
bLeast squares mean adjusted for baseline value
**p-value <0.0001 |
Add-On To Metformin And Thiazolidinedione
In this 26-week trial, 533 patients were randomized to
VICTOZA 1.2 mg, VICTOZA 1.8 mg or placebo, all as add-on to rosiglitazone (8
mg) plus metformin (2000 mg). Patients underwent a 9 week run-in period (3-week
forced dose escalation followed by a 6-week dose maintenance phase) with
rosiglitazone (starting at 4 mg and increasing to 8 mg/day within 2 weeks) and
metformin (starting at 500 mg with increasing weekly increments of 500 mg to a
final dose of 2000 mg/day). Only patients who tolerated the final dose of
rosiglitazone (8 mg/day) and metformin (2000 mg/day) and completed the 6-week
dose maintenance phase were eligible for randomization into the trial.
The mean age of participants was 55 years, and the mean
duration of diabetes was 9 years. Participants were 61.6% male, 84.2% White,
10.2% Black or African American and 16.4% of Hispanic ethnicity. The mean BMI
was 33.9 kg/m².
Treatment with VICTOZA as add-on to metformin and
rosiglitazone produced a statistically significant reduction in mean HbA1c
compared to placebo add-on to metformin and rosiglitazone (Table 10). The percentage
of patients who discontinued due to ineffective therapy was 1.7% in the VICTOZA
1.8 mg + metformin + rosiglitazone treatment group, 1.7% in the VICTOZA 1.2 mg
+ metformin + rosiglitazone treatment group, and 16.4% in the placebo +
metformin + rosiglitazone treatment group.
Table 10 : Results of a 26-week trial of VICTOZA as
add-on to metformin and thiazolidinedionea
|
VICTOZA 1.8 mg + Metformin + Rosiglitazone |
VICTOZA 1.2 mg + Metformin + Rosiglitazone |
Placebo + Metformin + Rosiglitazon e |
Intent-to-Treat Population (N) |
178 |
177 |
175 |
HbA1c (%) (Mean) |
Baseline |
8.6 |
8.5 |
8.4 |
Change from baseline (adjusted mean)b |
-1.5 |
-1.5 |
-0.5 |
Difference from placebo + metformin + rosiglitazone arm (adjusted mean)b 95% Confidence Interval |
-0.9**
(-1.1, -0.8) |
-0.9**
(-1.1, -0.8) |
|
Percentage of patients achieving HbA1c <7% |
54 |
57 |
28 |
Fasting Plasma Glucose (mg/dL) (Mean) |
Baseline |
185 |
181 |
179 |
Change from baseline (adjusted mean)b |
-44 |
-40 |
-8 |
Difference from placebo + metformin + rosiglitazone arm (adjusted mean)b 95% Confidence Interval |
-36**
(-44, -27) |
-32**
(-41, -23) |
|
Body Weight (kg) (Mean) |
Baseline |
94.9 |
95.3 |
98.5 |
Change from baseline (adjusted mean)b |
-2.0 |
-1.0 |
+0.6 |
Difference from placebo + metformin + rosiglitazone arm (adjusted mean)b 95% Confidence Interval |
-2.6**
(-3.4,-1.8) |
-1.6**
(-2.4, -1.0) |
|
aIntent-to-treat population using last
observation on study
bLeast squares mean adjusted for baseline value
**p-value <0.0001 |
VICTOZA Compared To Placebo Both With Or Without
metformin And/Or Sulfonylurea And/Or Pioglitazone And/Or Basal Or Premix
insulin In Patients With Type 2 Diabetes Mellitus And Moderate Renal Impairment
In this 26-week, double-blind, randomized,
placebo-controlled, parallel-group trial, 279 patients with moderate renal
impairment, as per MDRD formula (eGFR 30-59 mL/min/1.73 m²), were
randomized to VICTOZA or placebo once daily. VICTOZA was added to the patient’s
stable pre-trial antidiabetic regimen (insulin therapy and/or metformin,
pioglitazone, or sulfonylurea). The dose of VICTOZA was escalated according to
approved labeling to achieve a dose of 1.8 mg per day. The insulin dose was reduced
by 20% at randomization for patients with baseline HbA1c ≤ 8% and fixed
until liraglutide dose escalation was complete. Dose reduction of insulin and
SU was allowed in case of hypoglycemia; up titration of insulin was allowed but
not beyond the pre-trial dose.
The mean age of participants was 67 years, and the mean
duration of diabetes was 15 years. Participants were 50.5% male, 92.3% White,
6.6% Black or African American, and 7.2% of Hispanic ethnicity. The mean BMI
was 33.9 kg/m². Approximately half of patients had an eGFR between 30 and <45mL/min/1.73
m².
Treatment with VICTOZA resulted in a statistically
significant reduction in HbA1c from baseline at Week 26 compared to placebo
(see Table 11). 123 patients reached the 1.8 mg dose of VICTOZA.
Table 11 : Results of a 26-week trial of VICTOZA
compared to placebo in Patients with Renal Impairmenta
|
VICTOZA 1.8 mg + insulin and/or OAD |
Placebo + insulin and/or OAD |
Intent to Treat Population (N) |
140 |
137 |
HbA1c (%) |
Baseline (mean) |
8.1 |
8.0 |
Change from baseline (estimated mean)b,c |
-0.9 |
-0.4 |
Difference from placebob,c95% Confidence Interval |
-0.6* (-0.8,-0.3) |
|
Proportion achieving HbA1c < 7% d |
39.3 |
19.7 |
FPG (mg/dL) |
Baseline (mean) |
171 |
167 |
Change from baseline (estimated mean)e |
-22 |
-10 |
Difference from placeboe 95% Confidence Interval |
-12** (-23, -0.8) |
|
a Intent-to-treat population
b Estimated using a mixed model for repeated measurement with
treatment, country, stratification groups as factors and baseline as a covariate,
all nested within visit. Multiple imputation method modeled “wash out” of the
treatment effect for patients having missing data who discontinued treatment.
c Early treatment discontinuation, before week 26, occurred in 25%
and 22% of VICTOZA and placebo patients, respectively.
d Based on the known number of subjects achieving HbA1c < 7%.
When applying the multiple imputation method described in b) above, the estimated
percents achieving HbA1c < 7% are 47.6% and 24.9% for VICTOZA and placebo,
respectively.
e Estimated using a mixed model for repeated measurement with
treatment, country, stratification groups as factors and baseline as a covariate,
all nested within visit.
*p-value <0.0001
**p-value <0.05 |
Glycemic Control Trial In Pediatric Patients 10 Years Of Age
And Older With Type 2 Diabetes Mellitus
VICTOZA was evaluated in a 26-week, double-blind,
randomized, parallel group, placebo controlled multi-center trial
(NCT01541215), in 134 pediatric patients with type 2 diabetes aged 10 years and
older. Patients were randomized to VICTOZA once-daily or placebo once-daily in
combination with metformin with or without basal insulin treatment. All
patients were on a metformin dose of 1000 to 2000 mg prior to randomization.
The basal insulin dose was decreased by 20% at randomization and VICTOZA was titrated
weekly by 0.6 mg for 2 to 3 weeks based on tolerability and an average fasting
plasma glucose goal of <110 mg/dL.
The mean age was 14.6 years: 29.9% were ages 10-14 years,
and 70.1% were greater than 14 years of age. 38.1% were male, 64.9% were White,
13.4% were Asian, 11.9% were Black or African American; 29.1% were of Hispanic
or Latino ethnicity. The mean BMI was 33.9 kg/m² and the mean BMI SDS was 2.9.
18.7% of patients were using basal insulin at baseline. The mean duration of
diabetes was 1.9 years and the mean HbA1c was 7.8%.
At week 26, treatment with VICTOZA was superior in
reducing HbA1c from baseline versus placebo. The estimated treatment difference
in HbA1c reduction from baseline between VICTOZA and placebo was -1.06% with a
95% confidence interval of [-1.65%; -0.46%] (see Table 12).
Table 12 : Results at week 26 in a trial comparing
VICTOZA in combination with metformin with or without basal insulin versus
Placebo in combination with metformin with or without basal insulin in
Pediatric Patients 10 Years of Age and Older with Type 2 Diabetes Mellitus
|
VICTOZA+ metformin ±basal insulin |
Placebo+ metformin ±basal insulin |
N |
66 |
68 |
HbA1c (%) |
Baseline |
7.9 |
7.7 |
End of 26 weeks |
7.1 |
8.2 |
Adjusted mean change from baseline after 26 weeksa |
-0.64 |
0.42 |
Treatment difference [95%CI] VICTOZA vs Placebo |
-1.06 [-1.65; -0.46]* |
Percentage of patients achieving HbA1c <7%b |
63.7 |
36.5 |
FPG (mg/dL) |
Baseline |
157 |
147 |
End of 26 weeks |
132 |
166 |
Adjusted mean change from baseline after 26 weeksa |
-19.4 |
14.4 |
Treatment difference [95%CI] VICTOZA vs Placebo |
-33.83 [-55.74 ; -11.92] |
a The change from baseline to end of treatment
visit in HbA1c and FPG was analyzed using a pattern mixture model with multiple
imputation. Missing observations (10.6% in the VICTOZA, 14.5% in the placebo)
were imputed from the placebo arm based on multiple (x10,000) imputations. The
data for week 26 was then analyzed with an ANCOVA model containing treatment,
sex and age group as fixed effects and baseline value as covariate.
b Categories are derived from continuous measurements of HbA1c using
a pattern mixture model with multiple imputation for missing observations.
* p-value <0.001 |
Cardiovascular Outcomes Trial In Patients With Type 2
Diabetes Mellitus And Atherosclerotic Cardiovascular Disease
The LEADER trial (NCT01179048) was a multi-national,
multi-center, placebo-controlled, double-blind trial. In this study, 9340
patients with inadequately controlled type 2 diabetes and atherosclerotic cardiovascular
disease were randomized to VICTOZA 1.8 mg or placebo for a median duration of
3.5 years. The study compared the risk of major adverse cardiovascular events
between VICTOZA and placebo when these were added to, and used concomitantly
with, background standard of care treatments for type 2 diabetes. The primary
endpoint, MACE, was the time to first occurrence of a three part composite
outcome which included; cardiovascular death, non-fatal myocardial infarction
and non-fatal stroke.
Patients eligible to enter the trial were; 50 years of
age or older and had established, stable, cardiovascular, cerebrovascular,
peripheral artery disease, chronic kidney disease or NYHA class II and III
heart failure (80% of the enrolled population) or were 60 years of age or older
and had other specified risk factors for cardiovascular disease (20% of the
enrolled population).
At baseline, demographic and disease characteristics were
balanced. The mean age was 64 years and the population was 64.3% male, 77.5%
Caucasian, 10.0% Asian, and 8.3% Black. In the study, 12.1% of the population
identified as Hispanic or Latino. The mean duration of type 2 diabetes was 12.8
years, the mean HbA1c was 8.7% and the mean BMI was 32.5 kg/m². A history of
previous myocardial infarction was reported in 31% of randomized individuals, a
prior revascularization procedure in 39%, a prior ischemic stroke in 11%,
documented symptomatic coronary disease in 9%, documented asymptomatic cardiac
ischemia in 26%, and a diagnosis of New York Heart Association (NYHA) class II
to III heart failure in 14%. The mean eGFR at baseline was 79 mL/min/1.73 m²
and 41.8% of patients had mild renal impairment (eGFR 60 to 90 mL/min/1.73m²), 20.7%
had moderate renal impairment (eGFR 30 to 60 mL/min/1.73m²) and 2.4% of
patients had severe renal impairment (eGFR < 30 mL/min/1.73m²).
At baseline, patients treated their diabetes with; diet
and exercise only (3.9%), oral antidiabetic drugs only (51.5%), oral
antidiabetic drugs and insulin (36.7%) or insulin only (7.9%). The most common background
antidiabetic drugs used at baseline and in the trial were metformin,
sulfonylurea and insulin. Use of DPP-4 inhibitors and other GLP-1 receptor
agonists was excluded by protocol and SGLT-2 inhibitors were either not
approved or not widely available. At baseline, cardiovascular disease and risk factors
were managed with; non-diuretic antihypertensives (92.4%), diuretics (41.8%),
statin therapy (72.1%) and platelet aggregation inhibitors (66.8%). During the
trial, investigators could modify antidiabetic and cardiovascular medications
to achieve local standard of care treatment targets with respect to blood
glucose, lipid, and blood pressure, and manage patients recovering from an
acute coronary syndrome or stroke event per local treatment guidelines.
For the primary analysis, a Cox proportional hazards
model was used to test for non-inferiority against the pre-specified risk
margin of 1.3 for the hazard ratio of MACE and to test for superiority on MACE
if non-inferiority was demonstrated. Type 1 error was controlled across
multiple tests.
VICTOZA significantly reduced the occurrence of MACE. The
estimated hazard ratio (95% CI) for time to first MACE was 0.87 (0.78, 0.97).
Refer to Figure 5 and Table 13.
Vital status was available for 99.7% of subjects in the
trial. A total of 828 deaths were recorded during the LEADER trial. A majority
of the deaths in the trial were categorized as cardiovascular deaths and non-cardiovascular
deaths were balanced between the treatment groups (3.5% in patients treated
with VICTOZA and 3.6% in patients treated with placebo). The estimated hazard
ratio of time to all-cause death for VICTOZA compared to placebo was 0.85
(0.74, 0.97).
Figure 5 : Kaplan-Meier: Time to First Occurrence of a
MACE in the LEADER Trial (Patients with T2DM and Atherosclerotic CVD)
Table 13 : Treatment Effect for the Primary Composite
Endpoint, MACE, and its Components in the LEADER Trial (Patients with T2DM and
Atherosclerotic CVD)a
|
VICTOZA
N=4668 |
Placebo
N=4672 |
Hazard Ratio (95% CI)b |
Composite of cardiovascular death, non-fatal myocardial infarction, non-fatal stroke (MACE) (time to first occurrence) c |
608 (13.0%) |
694 (14.9%) |
0.87 (0.78; 0.97) |
Non-fatal myocardial infarctiond |
281 (6.0%) |
317 (6.8%) |
0.88 (0.75;1.03) |
Non-fatal stroked |
159 (3.4%) |
177 (3.8%) |
0.89 (0.72; 1.11) |
Cardiovascular deathd |
219 (4.7%) |
278 (6%) |
0.78 (0.66;0.93) |
aFull analysis set (all randomized patients)
bCox-proportional hazards model with treatment as a factor
cp-value for superiority (2-sided) 0.011
dNumber and percentage of first events |