CLINICAL PHARMACOLOGY
Mechanism Of Action
Vascular endothelial growth factor-A (VEGF-A) and
placental growth factor (PlGF) are members of the VEGF family of angiogenic
factors that can act as mitogenic, chemotactic, and vascular permeability
factors for endothelial cells. VEGF acts via two receptor tyrosine kinases,
VEGFR-1 and VEGFR-2, present on the surface of endothelial cells. PlGF binds
only to VEGFR-1, which is also present on the surface of leucocytes. Activation
of these receptors by VEGF-A can result in neovascularization and vascular
permeability.
Aflibercept acts as a soluble decoy receptor that binds
VEGF-A and PlGF, and thereby can inhibit the binding and activation of these
cognate VEGF receptors.
Pharmacodynamics
Neovascular (Wet) Age-Related Macular Degeneration (AMD)
In the clinical studies anatomic measures of disease
activity improved similarly in all treatment groups from baseline to week 52.
Anatomic data were not used to influence treatment decisions during the first
year.
Macular Edema Following Retinal Vein Occlusion (RVO)
Reductions in mean retinal thickness were observed in
COPERNICUS, GALILEO, and VIBRANT at week 24 compared to baseline. Anatomic data
were not used to influence treatment decisions [see Clinical Studies].
Diabetic Macular Edema (DME)
Reductions in mean retinal thickness were observed in
VIVID and VISTA at weeks 52 and 100 compared to baseline. Anatomic data were
not used to influence EYLEA treatment decisions [see Clinical Studies].
Pharmacokinetics
EYLEA is administered intravitreally to exert local
effects in the eye. In patients with wet AMD, RVO, or DME, following
intravitreal administration of EYLEA, a fraction of the administered dose is
expected to bind with endogenous VEGF in the eye to form an inactive
aflibercept: VEGF complex. Once absorbed into the systemic circulation,
aflibercept presents in the plasma as free aflibercept (unbound to VEGF) and a
more predominant stable inactive form with circulating endogenous VEGF (i.e.,
aflibercept: VEGF complex).
Absorption/Distribution
Following intravitreal administration of 2 mg per eye of
EYLEA to patients with wet AMD, RVO, and DME, the mean Cmax of free aflibercept
in the plasma was 0.02 mcg/mL (range: 0 to 0.054 mcg/mL), 0.05 mcg/mL (range: 0
to 0.081 mcg/mL), and 0.03 mcg/mL (range: 0 to 0.076 mcg/mL), respectively and
was attained in 1 to 3 days. The free aflibercept plasma concentrations were
undetectable two weeks post-dosing in all patients. Aflibercept did not
accumulate in plasma when administered as repeated doses intravitreally every 4
weeks. It is estimated that after intravitreal administration of 2 mg to
patients, the mean maximum plasma concentration of free aflibercept is more
than 100 fold lower than the concentration of aflibercept required to
half-maximally bind systemic VEGF.
The volume of distribution of free aflibercept following
intravenous (I.V.) administration of aflibercept has been determined to be
approximately 6L.
Metabolism/Elimination
Aflibercept is a therapeutic protein and no drug
metabolism studies have been conducted. Aflibercept is expected to undergo
elimination through both target-mediated disposition via binding to free
endogenous VEGF and metabolism via proteolysis. The terminal elimination
half-life (t½) of free aflibercept in plasma was approximately 5 to 6 days
after I.V. administration of doses of 2 to 4 mg/kg aflibercept.
Specific Populations
Renal Impairment
Pharmacokinetic analysis of a subgroup of patients
(n=492) in one wet AMD study, of which 43% had renal impairment (mild n=120,
moderate n=74, and severe n=16), revealed no differences with respect to plasma
concentrations of free aflibercept after intravitreal administration every 4 or
8 weeks. Similar results were seen in patients in a RVO study and in patients
in a DME study. No dose adjustment based on renal impairment status is needed
for either wet AMD, RVO, or DME patients.
Other
No special dosage modification is required for any of the
populations that have been studied (e.g., gender, elderly).
Animal Toxicology And/Or Pharmacology
Erosions and ulcerations of the respiratory epithelium in
nasal turbinates in monkeys treated with aflibercept intravitreally were
observed at intravitreal doses of 2 or 4 mg per eye. At the NOAEL of 0.5 mg per
eye in monkeys, the systemic exposure (AUC) was 56 times higher than the
exposure observed in humans after an intravitreal dose of 2 mg. Similar effects
were not seen in clinical studies [see Clinical Studies].
Clinical Studies
Neovascular (Wet) Age-Related Macular Degeneration (AMD)
The safety and efficacy of EYLEA were assessed in two
randomized, multi-center, double-masked, active-controlled studies in patients
with wet AMD. A total of 2412 patients were treated and evaluable for efficacy
(1817 with EYLEA) in the two studies (VIEW1 and VIEW2). In each study, up to
week 52, patients were randomly assigned in a 1:1:1:1 ratio to 1 of 4 dosing
regimens: 1) EYLEA administered 2 mg every 8 weeks following 3 initial monthly
doses (EYLEA 2Q8); 2) EYLEA administered 2 mg every 4 weeks (EYLEA 2Q4); 3)
EYLEA 0.5 mg administered every 4 weeks (EYLEA 0.5Q4); and 4) ranibizumab
administered 0.5 mg every 4 weeks (ranibizumab 0.5 mg Q4). Protocol-specified
visits occurred every 28±3 days. Patient ages ranged from 49 to 99 years with a
mean of 76 years.
In both studies, the primary efficacy endpoint was the
proportion of patients who maintained vision, defined as losing fewer than 15
letters of visual acuity at week 52 compared to baseline. Both EYLEA 2Q8 and EYLEA
2Q4 groups were shown to have efficacy that was clinically equivalent to the
ranibizumab 0.5 mg Q4 group in year 1.
Detailed results from the analysis of the VIEW1 and VIEW2
studies are shown in Table 4 and Figure 8 below.
Table 4: Efficacy Outcomes at Week 52 (Full Analysis
Set with LOCF) in VIEW1 and VIEW2 Studies
Full Analysis Set |
VIEW1 |
VIEW2 |
EYLEA 2 mg Q8 weeksa |
EYLEA 2 mg Q4 weeks |
ranibizu-mab 0.5 mg Q4 weeks |
EYLEA 2 mg Q8 weeksa |
EYLEA 2 mg Q4 weeks |
ranibizu-mab 0.5 mg Q4 weeks |
N=301 |
N=304 |
N=304 |
N=306 |
N=309 |
N=291 |
Efficacy Outcomes |
Proportion of patients who maintained visual acuity (%) (<15 letters of BCVA loss) |
94% |
95% |
94% |
95% |
95% |
95% |
Differenceb (%) (95.1% CI) |
0.6
(-3.2, 4.4) |
1.3
(-2.4, 5.0) |
|
0.6
(-2.9, 4.0) |
-0.3
(-4.0, 3.3) |
|
Mean change in BCVA as measured by ETDRS letter score from Baseline |
7.9 |
10.9 |
8.1 |
8.9 |
7.6 |
9.4 |
Differenceb in LS mean (95.1% CI) |
0.3
(-2.0, 2.5) |
3.2
(0.9, 5.4) |
|
-0.9
(-3.1, 1.3) |
-2.0
(-4.1, 0.2) |
|
Number of patients who gained at least 15 letters of vision from Baseline (%) |
92
(31%) |
114
(38%) |
94 (31%) |
96
(31%) |
91
(29%) |
99
(34%) |
Differenceb (%) (95.1% CI) |
-0.4
(-7.7, 7.0) |
6.6
(-1.0, 14.1) |
|
-2.6
(-10.2, 4.9) |
-4.6
(-12.1, 2.9) |
|
BCVA = Best Corrected Visual Acuity; CI = Confidence
Interval; ETDRS = Early Treatment Diabetic Retinopathy Study; LOCF = Last
Observation Carried Forward (baseline values are not carried forward); 95.1%
confidence intervals were presented to adjust for safety assessment conducted
during the study
a After treatment initiation with 3 monthly doses
b EYLEA group minus the ranibizumab group |
Treatment effects in evaluable subgroups (e.g., age,
gender, race, baseline visual acuity) in each study were in general consistent
with the results in the overall populations.
Figure 8: Mean Change in Visual Acuity from Baseline
to Week 96* in VIEW1 and VIEW2 Studies
*Patient dosing schedules were individualized from weeks
52 to 96 using a modified 12-week dosing regimen.
VIEW1 and VIEW2 studies were both 96 weeks in duration.
However after 52 weeks patients no longer followed a fixed dosing schedule.
Between week 52 and week 96, patients continued to receive the drug and dosage
strength to which they were initially randomized on a modified 12 week dosing
schedule (doses at least every 12 weeks and additional doses as needed).
Therefore, during the second year of these studies there was no active control
comparison arm.
Macular Edema Following Central Retinal Vein Occlusion (CRVO)
The safety and efficacy of EYLEA were assessed in two
randomized, multi-center, double-masked, sham-controlled studies in patients
with macular edema following CRVO. A total of 358 patients were treated and
evaluable for efficacy (217 with EYLEA) in the two studies (COPERNICUS and
GALILEO). In both studies, patients were randomly assigned in a 3:2 ratio to
either 2 mg EYLEA administered every 4 weeks (2Q4), or sham injections (control
group) administered every 4 weeks for a total of 6 injections.
Protocol-specified visits occurred every 28±7 days. Patient ages ranged from 22
to 89 years with a mean of 64 years.
In both studies, the primary efficacy endpoint was the
proportion of patients who gained at least 15 letters in BCVA compared to
baseline. At week 24, the EYLEA 2 mg Q4 group was superior to the control group
for the primary endpoint.
Results from the analysis of the COPERNICUS and GALILEO
studies are shown in Table 5 and Figure 9 below.
Table 5: Efficacy Outcomes at Week 24 (Full Analysis
Set with LOCF) in COPERNICUS and GALILEO Studies
|
COPERNICUS |
GALILEO |
Control
N=73 |
EYLEA 2 mg Q4 weeks
N=114 |
Control
N=68 |
EYLEA 2 mg Q4 weeks
N=103 |
Efficacy Outcomes |
Proportion of patients who gained at least 15 letters in BCVA from Baseline (%) |
12% |
56% |
22% |
60% |
Weighted Differencea,b (%) (95.1% CI) |
|
44.8%c (32.9, 56.6) |
|
38.3%c (24.4, 52.1) |
Mean change in BCVA as measured by ETDRS letter score from Baseline (SD) |
-4.0 (18.0) |
17.3 (12.8) |
3.3 (14.1) |
18.0 (12.2) |
Difference in LS meana,d (95.1% CI) |
|
21.7c (17.3, 26.1) |
|
14.7c (10.7, 18.7) |
a Difference is EYLEA 2 mg Q4 weeks minus
Control
b Difference and CI are calculated using Cochran-Mantel-Haenszel
(CMH) test adjusted for baseline factors; 95.1% confidence intervals were
presented to adjust for the multiple assessments conducted during the study
c p<0.01 compared with Control
d LS mean and CI based on an ANCOVA model |
Figure 9: Mean Change in BCVA as Measured by ETDRS
Letter Score from Baseline to Week 24 in COPERNICUS and GALILEO Studies
Treatment effects in evaluable subgroups (e.g., age,
gender, race, baseline visual acuity, retinal perfusion status, and CRVO
duration) in each study and in the combined analysis were in general consistent
with the results in the overall populations.
Macular Edema Following Branch Retinal Vein Occlusion
(BRVO)
The safety and efficacy of EYLEA were assessed in a
24-week, randomized, multi-center, double-masked, controlled study in patients
with macular edema following BRVO. A total of 181 patients were treated and
evaluable for efficacy (91 with EYLEA) in the VIBRANT study. In the study,
patients were randomly assigned in a 1:1 ratio to either 2 mg EYLEA
administered every 4 weeks (2Q4) or laser photocoagulation administered at
baseline and subsequently as needed (control group). Protocol-specified visits
occurred every 28±7 days. Patient ages ranged from 42 to 94 years with a mean
of 65 years.
In the VIBRANT study, the primary efficacy endpoint was
the proportion of patients who gained at least 15 letters in BCVA at week 24
compared to baseline. At week 24, the EYLEA 2 mg Q4 group was superior to the
control group for the primary endpoint.
Detailed results from the analysis of the VIBRANT study
are shown in Table 6 and Figure 10 below.
Table 6: Efficacy Outcomes at Week 24 (Full Analysis
Set with LOCF) in VIBRANT Study
|
VIBRANT |
Control
N=90 |
EYLEA 2 mg Q4 weeks
N=91 |
Efficacy Outcomes |
Proportion of patients who gained at least 15 letters in BCVA from Baseline (%) |
26.7% |
52.7% |
Weighted Differencea,b (%) (95% CI) |
|
26.6%c (13.0, 40.1) |
Mean change in BCVA as measured by ETDRS letter score from Baseline (SD) |
6.9 (12.9) |
17.0 (11.9) |
Difference in LS meana,d (95% CI) |
|
10.5c (7.1, 14.0) |
a Difference is EYLEA 2 mg Q4 weeks minus
Control
b Difference and CI are calculated using Mantel-Haenszel weighting
scheme adjusted for region (North America vs. Japan) and baseline BCVA category
(> 20/200 and ≤ 20/200)
c p<0.01 compared with Control
d LS mean and CI based on an ANCOVA model |
Figure 10: Mean Change in BCVA as Measured by ETDRS
Letter Score from Baseline to Week 24 in VIBRANT Study
Treatment effects in evaluable subgroups (e.g., age,
gender, and baseline retinal perfusion status) in the study were in general
consistent with the results in the overall populations.
Diabetic Macular Edema (DME)
The safety and efficacy of EYLEA were assessed in two
randomized, multi-center, double-masked, controlled studies in patients with
DME. A total of 862 randomized and treated patients were evaluable for
efficacy. Protocol-specified visits occurred every 28±7 days. Patient ages
ranged from 23 to 87 years with a mean of 63 years.
Of those, 576 were randomized to EYLEA groups in the two
studies (VIVID and VISTA). In each study, patients were randomly assigned in a
1:1:1 ratio to 1 of 3 dosing regimens: 1) EYLEA administered 2 mg every 8 weeks
following 5 initial monthly injections (EYLEA 2Q8); 2) EYLEA administered 2 mg
every 4 weeks (EYLEA 2Q4); and 3) macular laser photocoagulation (at baseline
and then as needed). Beginning at week 24, patients meeting a pre-specified
threshold of vision loss were eligible to receive additional treatment:
patients in the EYLEA groups could receive laser and patients in the laser
group could receive EYLEA.
In both studies, the primary efficacy endpoint was the
mean change from baseline in BCVA at week 52 as measured by ETDRS letter score.
Efficacy of both EYLEA 2Q8 and EYLEA 2Q4 groups was statistically superior to
the control group. This statistically superior improvement in BCVA was
maintained at week 100 in both studies.
Results from the analysis of the VIVID and VISTA studies
are shown in Table 7 and Figure 11 below.
Table 7: Efficacy Outcomes at Weeks 52 and 100 (Full
Analysis Set with LOCF) in VIVID and VISTA Studies
|
VIVID |
VISTA |
EYLEA 2 mg Q8 weeksa |
EYLEA 2 mg Q4 weeks |
Control |
EYLEA 2 mg Q8 weeksa |
EYLEA 2 mg Q4 weeks |
Control |
Full Analysis Set |
N=135 |
N=136 |
N=132 |
N=151 |
N=154 |
N=154 |
Efficacy Outcomes at Week 52 |
Mean change in BCVA as measured by ETDRS letter score from Baseline (SD) |
10.7
(9.3) |
10.5
(9.6) |
1.2
(10.6) |
10.7
(8.2) |
12.5
(9.5) |
0.2
(12.5) |
Differenceb, c in LS mean (97.5% CI) |
9.1d
(6.3, 11.8) |
9.3d
(6.5, 12.0) |
|
10.5d
(7.7, 13.2) |
12.2d
(9.4, 15.0) |
|
Proportion of patients who gained at least 15 letters in BCVA from Baseline (%) |
33.3% |
32.4% |
9.1% |
31.1% |
41.6% |
7.8% |
Adjusted Differencec, e (%) (97.5% CI) |
24.2%d
(13.5, 34.9) |
23.3%d
(12.6, 33.9) |
|
23.3%d
(13.5, 33.1) |
34.2%d
(24.1, 44.4) |
|
Efficacy Outcomes at Week 100 |
Mean change in BCVA as measured by ETDRS letter score from Baseline (SD) |
9.4
(10.5) |
11.4
(11.2) |
0.7
(11.8) |
11.1
(10.7) |
11.5
(13.8) |
0.9
(13.9) |
Differenceb, c in LS mean (97.5% CI) |
8.2d
(5.2, 11.3) |
10.7d
(7.6, 13.8) |
|
10.1d
(7.0, 13.3) |
10.6d
(7.1, 14.2) |
|
Proportion of patients who gained at least 15 letters in BCVA from Baseline (%) |
31.1% |
38.2% |
12.1% |
33.1% |
38.3% |
13.0% |
Adjusted Differencec,e (%) (97.5% CI) |
19.0%d
(8.0, 29.9) |
26.1%d
(14.8, 37.5) |
|
20.1%d
(9.6, 30.6) |
25.8%d
(15.1, 36.6) |
|
a After treatment initiation with 5 monthly
injections
b LS mean and CI based on an ANCOVA model with baseline BCVA
measurement as a covariate and a factor for treatment group. Additionally,
protocol specified stratification factors were included in the model
c Difference is EYLEA group minus Control group
d p<0.01 compared with Control
e Difference with confidence interval (CI) and statistical test is
calculated using Mantel-Haenszel weighting scheme adjusted by protocol
specified stratification factors |
Figure 11: Mean Change in BCVA as Measured by ETDRS
Letter Score from Baseline to Week 100 in VIVID and VISTA Studies
Treatment effects in the subgroup of patients who had
previously been treated with a VEGF inhibitor prior to study participation were
similar to those seen in patients who were VEGF inhibitor naïve prior to study
participation.
Treatment effects in evaluable subgroups (e.g., age,
gender, race, baseline HbA1c, baseline visual acuity, prior anti-VEGF therapy)
in each study were in general consistent with the results in the overall
populations.
Diabetic Retinopathy (DR)
Efficacy and safety data of EYLEA in diabetic retinopathy
(DR) are derived from the VIVID, VISTA, and PANORAMA studies.
VIVID AND VISTA
In the VIVID and VISTA studies, an efficacy outcome was
the change in the Early Treatment Diabetic Retinopathy Study (ETDRS) Diabetic
Retinopathy Severity Scale (ETDRS-DRSS). The ETDRS-DRSS score was assessed at
baseline and approximately every 6 months thereafter for the duration of the
studies [see Clinical Studies].
All enrolled patients had DR and DME at baseline. The
majority of patients enrolled in these studies (77%) had moderate-to-severe
nonproliferative diabetic retinopathy (NPDR) based on the ETDRS-DRSS. At week
100, the proportion of patients improving by at least 2 steps on the ETDRS-DRSS
was significantly greater in both EYLEA treatment groups (2Q4 and 2Q8) when
compared to the control group.
Results from the analysis of ETDRS-DRSS at week 100 in
the VIVID and VISTA studies are shown in Table 8 below.
Table 8: Proportion of Patients Who Achieved a
≥2-Step Improvement from Baseline in the ETDRS-DRSS Score at Week 100 in
VIVID and VISTA Studies
|
VIVID |
VISTA |
EYLEA 2 mg Q8 weeks a |
EYLEA 2 mg Q4 weeks |
Control |
EYLEA 2 mg Q8 weeks a |
EYLEA 2 mg Q4 weeks |
Control |
Evaluable Patientsb |
N=101 |
N=97 |
N=99 |
N=148 |
N=153 |
N=150 |
Number of patients with a ≥2-step improvement on ETDRS-DRSS from Baseline (%) |
32
(32%) |
27
(28%) |
7
(7%) |
56
(38%) |
58
(38%) |
24
(16%) |
Differencec,d (%) (97.5% CI) |
24%e
(12, 36) |
21%e
(9, 33) |
|
22%e
(11, 33) |
22%e
(11, 33) |
|
Non-gradable post-baseline ETDRS-DRSS values were treated
as missing and were imputed using the last gradable ETDRS-DRSS values
(including baseline values if all post-baseline values were missing or
non-gradable)
a After treatment initiation with 5 monthly injections
b The number of evaluable patients included all patients who had
valid ETDRS-DRSS data at baseline
c Difference with confidence interval (CI) was calculated using
Mantel-Haenszel weighting scheme adjusted by protocol specified stratification
factors
d Difference is EYLEA minus Control group
e p<0.01 compared with Control |
Results of the evaluable subgroups (e.g., age, gender,
race, baseline HbA1c, baseline visual acuity) on the proportion of patients who
achieved a ≥2-step improvement on the ETDRS-DRSS from baseline to week
100 were, in general, consistent with those in the overall population.
PANORAMA
The PANORAMA study assessed the safety and efficacy of
EYLEA in a randomized, multi-center, double-masked, controlled study in
patients with moderately severe to severe nonproliferative diabetic retinopathy
(NPDR) (ETDRS-DRSS of 47 or 53), without central-involved DME (CI-DME). A total
of 402 randomized patients were evaluable for efficacy. Protocol-specified
visits occurred every 28±7 days for the first 5 visits, then every 8 weeks
(56±7 days). Patient ages ranged from 25 to 85 years with a mean of 55.7 years.
Patients were randomly assigned in a 1:1:1 ratio to 1 of
3 dosing regimens: 1) 3 initial monthly EYLEA 2 mg injections followed by one
injection after 8 weeks and then one injection every 16 weeks (EYLEA 2Q16); 2)
5 monthly EYLEA 2 mg injections followed by one injection every 8 weeks (EYLEA
2Q8); and 3) sham treatment.
The primary efficacy endpoint was the proportion of
patients who improved by ≥2 steps on the DRSS from baseline to week 24 in
the combined EYLEA groups and at week 52 in the 2Q16 and 2Q8 groups
individually versus sham. A key secondary endpoint was the proportion of
patients developing the composite endpoint of proliferative diabetic
retinopathy or anterior segment neovascularization through week 52.
At week 52, efficacy in the 2Q16 and 2Q8 groups was
superior to the sham group (see Table 9). The proportion of patients with a
≥2-step improvement over time is shown in Figure 12.
Table 9: Proportion of Patients Who Achieved a
≥2-Step Improvement from Baseline in the ETDRS-DRSS Score at Weeks 24 and
52 in PANORAMA
|
PANORAMA |
Week 24 |
Week 52 |
EYLEA Combined |
Control (sham) |
EYLEA 2Q16 |
EYLEA 2Q8 |
Control (sham) |
Full Analysis Set |
N=269 |
N=133 |
N=135 |
N=134 |
N=133 |
Proportion of patients with a ≥2-step improvement on ETDRS-DRSS from Baseline (%) |
58% |
6% |
65% |
80% |
15% |
Adjusted Differencea (%) (95% CI)b |
52% c (45, 60) |
|
50%c (40, 60) |
65%c (56, 74) |
|
Non-gradable post-baseline ETDRS-DRSS values were treated
as missing and were imputed using the last gradable ETDRS-DRSS values
(including baseline values if all post-baseline values were missing or
non-gradable)
a Difference is EYLEA group minus sham
b Difference with CI was calculated using the Mantel-Haenszel
weighting scheme adjusted by baseline DRSS stratification variable
c p<0.01 compared with Control. p-value was calculated using a
2-sided Cochran-Mantel-Haenszel test adjusted by baseline DRSS stratification
variable. |
Figure 12: Proportion of Patients Who Achieved a
≥2-Step Improvement from Baseline in the ETDRS-DRSS Score Through Week 52
in PANORAMA
Table 10: Effect of EYLEA on Worsening of Diabetic
Retinopathy in PANORAMA through Week 52
|
EYLEA 2Q16 |
EYLEA 2Q8 |
Control (Sham) |
Full Analysis Set |
N=135 |
N=134 |
N=133 |
Composite Endpoint of Developing PDR or ASNVa |
Event Rateb |
4.0%d |
2.4%d |
20.1% |
Hazard Ratio |
0.15 |
0.12 |
|
Development of Proliferative Diabetic Retinopathyc |
Event Rateb |
1.6%d |
0.0%d |
11.9% |
Hazard Ratio |
0.11 |
0.00 |
|
PDR = Proliferative Diabetic Retinopathy; ASNV = Anterior
Segment Neovascularization
a As diagnosed by either the Reading Center or Investigator through
week 52
b Estimated using Kaplan-Meier method
c Defined as ≥2-step worsening on the ETDRS-DRSS score through
week 52
d p<0.01 compared with Control |