CLINICAL PHARMACOLOGY
Mechanism Of Action
Adalimumab products bind
specifically to TNF-alpha and block its interaction with the p55 and p75 cell
surface TNF receptors. Adalimumab products also lyse surface TNF expressing
cells in vitro in the presence of complement. Adalimumab products do not bind
or inactivate lymphotoxin (TNF-beta). TNF is a naturally occurring cytokine
that is involved in normal inflammatory and immune responses. Elevated levels
of TNF are found in the synovial fluid of patients with RA, JIA, PsA, and AS
and play an important role in both the pathologic inflammation and the joint
destruction that are hallmarks of these diseases. Increased levels of TNF are
also found in psoriasis plaques. In Ps, treatment with ABRILADA may reduce the
epidermal thickness and infiltration of inflammatory cells. The relationship
between these pharmacodynamic activities and the mechanism(s) by which
adalimumab products exert their clinical effects is unknown.
Adalimumab products also modulate biological responses
that are induced or regulated by TNF, including changes in the levels of
adhesion molecules responsible for leukocyte migration (ELAM-1, VCAM-1, and
ICAM-1 with an IC50 of 1-2 X 10-10M).
Pharmacodynamics
After treatment with
adalimumab, a decrease in levels of acute phase reactants of inflammation
(C-reactive protein [CRP] and erythrocyte sedimentation rate [ESR]) and serum
cytokines (IL-6) was observed compared to baseline in patients with rheumatoid
arthritis. A decrease in CRP levels was also observed in patients with Crohnâ⬙s
disease and ulcerative colitis. Serum levels of matrix metalloproteinases
(MMP-1 and MMP-3) that produce tissue remodeling responsible for cartilage
destruction were also decreased after adalimumab administration.
Pharmacokinetics
The maximum serum concentration
(Cmax) and the time to reach the maximum concentration (Tmax) were 4.7 ± 1.6
μg/mL and 131 ± 56 hours respectively, following a single 40 mg
subcutaneous administration of adalimumab to healthy adult subjects. The
average absolute bioavailability of adalimumab estimated from three studies
following a single 40 mg subcutaneous dose was 64%. The pharmacokinetics of
adalimumab were linear over the dose range of 0.5 to 10.0 mg/kg following a
single intravenous dose.
The single-dose
pharmacokinetics of adalimumab in RA patients were determined in several
studies with intravenous doses ranging from 0.25 to 10 mg/kg. The distribution
volume (Vss) ranged from 4.7 to 6.0 L. The systemic clearance of adalimumab is
approximately 12 mL/hr. The mean terminal half-life was approximately 2 weeks,
ranging from 10 to 20 days across studies. Adalimumab concentrations in the
synovial fluid from five rheumatoid arthritis patients ranged from 31 to 96% of
those in serum.
In RA patients receiving 40 mg
adalimumab every other week, adalimumab mean steady-state trough concentrations
of approximately 5 μg/mL and 8 to 9 μg/mL, were observed without and
with methotrexate (MTX), respectively. MTX reduced adalimumab apparent
clearance after single and multiple dosing by 29% and 44% respectively, in
patients with RA. Mean serum adalimumab trough levels at steady state increased
approximately proportionally with dose following 20, 40, and 80 mg every other
week and every week subcutaneous dosing. In long-term studies with dosing more
than two years, there was no evidence of changes in clearance over time.
Adalimumab mean steady-state
trough concentrations were slightly higher in psoriatic arthritis patients
treated with 40 mg adalimumab every other week (6 to 10 μg/mL and 8.5 to
12 μg/mL, without and with MTX, respectively) compared to the concentrations
in RA patients treated with the same dose.
The pharmacokinetics of
adalimumab in patients with AS were similar to those in patients with RA.
In patients with CD, the
loading dose of 160 mg adalimumab on Week 0 followed by 80 mg adalimumab on
Week 2 achieves mean serum adalimumab trough levels of approximately 12
μg/mL at Week 2 and Week 4. Mean steady-state trough levels of
approximately 7 μg/mL were observed at Week 24 and Week 56 in CD patients
after receiving a maintenance dose of 40 mg adalimumab every other week.
In patients with UC, the
loading dose of 160 mg adalimumab on Week 0 followed by 80 mg adalimumab on
Week 2 achieves mean serum adalimumab trough levels of approximately 12
μg/mL at Week 2 and Week 4. Mean steady-state trough level of approximately
8 μg/mL was observed at Week 52 in UC patients after receiving a dose of
40 mg adalimumab every other week, and approximately 15 μg/mL at Week 52
in UC patients who increased to a dose of 40 mg adalimumab every week.
In patients with Ps, the mean
steady-state trough concentration was approximately 5 to 6 μg/mL during
adalimumab 40 mg every other week monotherapy treatment.
Population pharmacokinetic
analyses in patients with RA revealed that there was a trend toward higher
apparent clearance of adalimumab in the presence of anti-adalimumab antibodies,
and lower clearance with increasing age in patients aged 40 to >75 years.
Minor increases in apparent
clearance were also predicted in RA patients receiving doses lower than the
recommended dose and in RA patients with high rheumatoid factor or CRP
concentrations. These increases are not likely to be clinically important.
No gender-related
pharmacokinetic differences were observed after correction for a patientâ⬙s body
weight. Healthy volunteers and patients with rheumatoid arthritis displayed
similar adalimumab pharmacokinetics.
No pharmacokinetic data are
available in patients with hepatic or renal impairment.
In Study JIA-I for patients
with polyarticular JIA who were 4 to 17 years of age, the mean steady-state
trough serum adalimumab concentrations for patients weighing <30 kg
receiving 20 mg adalimumab subcutaneously every other week as monotherapy or
with concomitant MTX were 6.8 μg/mL and 10.9 μg/mL, respectively. The
mean steady-state trough serum adalimumab concentrations for patients weighing
≥30 kg receiving 40 mg adalimumab subcutaneously every other week as
monotherapy or with concomitant MTX were 6.6 μg/mL and 8.1 μg/mL,
respectively.
Clinical Studies
Rheumatoid Arthritis
The efficacy and safety of
adalimumab were assessed in five randomized, double-blind studies in patients
≥18 years of age with active rheumatoid arthritis (RA) diagnosed
according to American College of Rheumatology (ACR) criteria. Patients had at
least 6 swollen and 9 tender joints.
Adalimumab was administered
subcutaneously in combination with methotrexate (MTX) (12.5 to 25 mg, Studies
RA-I, RA-III and RA-V) or as monotherapy (Studies RA-II and RA-V) or with other
disease-modifying anti-rheumatic drugs (DMARDs) (Study RA-IV).
Study RA-I evaluated 271
patients who had failed therapy with at least one but no more than four DMARDs
and had inadequate response to MTX. Doses of 20, 40 or 80 mg of adalimumab or
placebo were given every other week for 24 weeks.
Study RA-II evaluated 544
patients who had failed therapy with at least one DMARD. Doses of placebo, 20
or 40 mg of adalimumab were given as monotherapy every other week or weekly for
26 weeks.
Study RA-III evaluated 619
patients who had an inadequate response to MTX. Patients received placebo, 40
mg of adalimumab every other week with placebo injections on alternate weeks,
or 20 mg of adalimumab weekly for up to 52 weeks. Study RA-III had an
additional primary endpoint at 52 weeks of inhibition of disease progression
(as detected by X-ray results). Upon completion of the first 52 weeks, 457
patients enrolled in an open-label extension phase in which 40 mg of adalimumab
was administered every other week for up to 5 years.
Study RA-IV assessed safety in
636 patients who were either DMARD-naive or were permitted to remain on their
pre-existing rheumatologic therapy provided that therapy was stable for a
minimum of 28 days. Patients were randomized to 40 mg of adalimumab or placebo
every other week for 24 weeks.
Study RA-V evaluated 799
patients with moderately to severely active RA of less than 3 years duration
who were ≥18 years old and MTX naïve. Patients were randomized to receive
either MTX (optimized to 20 mg/week by Week 8), adalimumab 40 mg every other
week or adalimumab/MTX combination therapy for 104 weeks. Patients were
evaluated for signs and symptoms, and for radiographic progression of joint
damage. The median disease duration among patients enrolled in the study was 5
months. The median MTX dose achieved was 20 mg.
Clinical Response
The percent of adalimumab-treated
patients achieving ACR 20, 50, and 70 responses in Studies RA-II and III are
shown in Table 2.
Table 2: ACR Responses in Studies RA-II and RA-III
(Percent of Patients)
Response |
Study RA-II Monotherapy (26 weeks) |
Study RA-III Methotrexate Combination (24 and 52 weeks) |
Placebo
N=110 |
Adalimumab 40 mg Every Other Week
N=113 |
Adalimumab 40 mg Weekly
N=103 |
Placebo /MTX
N=200 |
Adalimumab/MTX 40 mg Every Other Week
N=207 |
ACR20 |
Month 6 |
19% |
46%* |
53%* |
30% |
63%* |
Month 12 |
NA |
NA |
NA |
24% |
59%* |
ACR50 |
Month 6 |
8% |
22%* |
35%* |
10% |
39%* |
Month 12 |
NA |
NA |
NA |
10% |
42%* |
ACR70 |
Month 6 |
2% |
12%* |
18%* |
3% |
21%* |
Month 12 |
NA |
NA |
NA |
5% |
23%* |
* p<0.01, adalimumab vs.
placebo. |
The results of Study RA-I were
similar to Study RA-III; patients receiving adalimumab 40 mg every other week
in Study RA-I also achieved ACR 20, 50, and 70 response rates of 65%, 52%, and
24%, respectively, compared to placebo responses of 13%, 7%, and 3%
respectively, at 6 months (p<0.01).
The results of the components
of the ACR response criteria for Studies RA-II and RA-III are shown in Table 3.
ACR response rates and improvement in all components of ACR response were
maintained to Week 104. Over the 2 years in Study RA-III, 20% of adalimumab
patients receiving 40 mg every other week achieved a major clinical response,
defined as maintenance of an ACR 70 response over a 6-month period. ACR
responses were maintained in similar proportions of patients for up to 5 years
with continuous adalimumab treatment in the open-label portion of Study RA-III.
Table 3: Components of ACR
Response in Studies RA-II and RA-III
Parameter (median) |
Study RA-II |
Study RA-III |
Placebo
N=110 |
Adalimumaba
N=113 |
Placebo/ MTX
N=200 |
Adalimumaba/ MTX
N=207 |
Baseline |
Wk 26 |
Baseline |
Wk 26 |
Baseline |
Wk 24 |
Baseline |
Wk 24 |
Number of tender joints (0-68) |
35 |
26 |
31 |
16* |
26 |
15 |
24 |
8* |
Number of swollen joints (0-66) |
19 |
16 |
18 |
10* |
17 |
11 |
18 |
5* |
Physician global assessmentb |
7.0 |
6.1 |
6.6 |
3.7* |
6.3 |
3.5 |
6.5 |
2.0* |
Patient global assessmentb |
7.5 |
6.3 |
7.5 |
4.5* |
5.4 |
3.9 |
5.2 |
2.0* |
Painb |
7.3 |
6.1 |
7.3 |
4.1* |
6.0 |
3.8 |
5.8 |
2.1* |
Disability index (HAQ)c |
2.0 |
1.9 |
1.9 |
1.5* |
1.5 |
1.3 |
1.5 |
0.8* |
CRP (mg/dL) |
3.9 |
4.3 |
4.6 |
1.8* |
1.0 |
0.9 |
1.0 |
0.4* |
a 40 mg adalimumab administered every other
week.
b Visual analogue scale; 0=best, 10=worst.
cDisability Index of the Health Assessment Questionnaire; 0=best,
3=worst, measures the patientâ⬙s ability to perform the following: dress/groom,
arise, eat, walk, reach, grip, maintain hygiene, and maintain daily activity.
* p<0.001, adalimumab vs. placebo, based on mean change from baseline. |
The time course of ACR 20 response for Study RA-III is
shown in Figure 1.
In Study RA-III, 85% of
patients with ACR 20 responses at Week 24 maintained the response at 52 weeks.
The time course of ACR 20 response for Study RA-I and Study RA-II were similar.
Figure 1: Study RA-III ACR
20 Responses Over 52 Weeks
In Study RA-IV, 53% of patients
treated with adalimumab 40 mg every other week plus standard of care had an ACR
20 response at Week 24 compared to 35% on placebo plus standard of care
(p<0.001). No unique adverse reactions related to the combination of
adalimumab and other DMARDs were observed.
In Study RA-V with MTX naïve
patients with recent onset RA, the combination treatment with adalimumab plus
MTX led to greater percentages of patients achieving ACR responses than either
MTX monotherapy or adalimumab monotherapy at Week 52 and responses were
sustained at Week 104 (see Table 4).
Table 4: ACR Response in
Study RA-V (Percent of Patients)
Response |
MTXb
N=257 |
Adalimumabc
N=274 |
Adalimumab /MTX
N=268 |
ACR20 |
Week 52 |
63% |
54% |
73% |
Week 104 |
56% |
49% |
69% |
ACR50 |
Week 52 |
46% |
41% |
62% |
Week 104 |
43% |
37% |
59% |
ACR70 |
Week 52 |
27% |
26% |
46% |
Week 104 |
28% |
28% |
47% |
Major Clinical Responsea |
28% |
25% |
49% |
a Major clinical response is defined as
achieving an ACR70 response for a continuous six month period.
b p<0.05, adalimumab/MTX vs. MTX for ACR 20; p<0.001,
adalimumab/MTX vs. MTX for ACR 50 and 70, and Major Clinical Response.
cp<0.001, adalimumab/MTX vs. adalimumab. |
At Week 52, all individual components of the ACR response
criteria for Study RA-V improved in the adalimumab/MTX group and improvements
were maintained to Week 104.
Radiographic Response
In Study RA-III, structural
joint damage was assessed radiographically and expressed as change in Total
Sharp Score (TSS) and its components, the erosion score and Joint Space
Narrowing (JSN) score, at month 12 compared to baseline. At baseline, the
median TSS was approximately 55 in the placebo and 40 mg every other week
groups. The results are shown in Table 5. Adalimumab/MTX treated patients
demonstrated less radiographic progression than patients receiving MTX alone at
52 weeks.
Table 5: Radiographic Mean
Changes Over 12 Months in Study RA-III
|
Placebo/MTX |
Adalimumab/ MTX 40 mg Every Other Week |
Placebo/MTX Adalimumab/ MTX (95% Confidence Interval*) |
P-value** |
Total Sharp score |
2.7 |
0.1 |
2.6 (1.4, 3.8) |
<0.001 |
Erosion score |
1.6 |
0.0 |
1.6 (0.9, 2.2) |
<0.001 |
JSN score |
1.0 |
0.1 |
0.9 (0.3, 1.4) |
0.002 |
* 95% confidence intervals for
the differences in change scores between MTX and adalimumab.
** Based on rank analysis. |
In the open-label extension of
Study RA-III, 77% of the original patients treated with any dose of adalimumab
were evaluated radiographically at 2 years. Patients maintained inhibition of
structural damage, as measured by the TSS. Fifty-four percent had no
progression of structural damage as defined by a change in the TSS of zero or
less. Fifty-five percent (55%) of patients originally treated with 40 mg
adalimumab every other week have been evaluated radiographically at 5 years.
Patients had continued inhibition of structural damage with 50% showing no
progression of structural damage defined by a change in the TSS of zero or
less.
In Study RA-V, structural joint
damage was assessed as in Study RA-III. Greater inhibition of radiographic
progression, as assessed by changes in TSS, erosion score and JSN was observed
in the adalimumab/MTX combination group as compared to either the MTX or
adalimumab monotherapy group at Week 52 as well as at Week 104 (see Table 6).
Table 6: Radiographic Mean
Change* in Study RA-V
|
|
MTXa
N=257 |
Adalimumaba,b
N=274 |
Adalimumab/MTX
N=268 |
52 Weeks |
Total Sharp score |
5.7 (4.2, 7.3) |
3.0 (1.7, 4.3) |
1.3 (0.5, 2.1) |
Erosion score |
3.7 (2.7, 4.8) |
1.7 (1.0, 2.4) |
0.8 (0.4, 1.2) |
JSN score |
2.0 (1.2, 2.8) |
1.3 (0.5, 2.1) |
0.5 (0.0, 1.0) |
104 Weeks |
Total Sharp score |
10.4 (7.7, 13.2) |
5.5 (3.6, 7.4) |
1.9 (0.9, 2.9) |
Erosion score |
6.4 (4.6, 8.2) |
3.0 (2.0, 4.0) |
1.0 (0.4, 1.6) |
JSN score |
4.1 (2.7, 5.4) |
2.6 (1.5, 3.7) |
0.9 (0.3, 1.5) |
*mean (95% confidence interval).
a p<0.001, adalimumab/MTX vs. MTX at 52 and 104 weeks and for
adalimumab/MTX vs. adalimumab at 104 weeks.
b p<0.01, for adalimumab/MTX vs. adalimumab at 52 weeks. |
Physical Function Response
In Studies RA-I through IV,
adalimumab showed significantly greater improvement than placebo in the
disability index of Health Assessment Questionnaire (HAQ-DI) from baseline to
the end of study, and significantly greater improvement than placebo in the
health-outcomes as assessed by the Short Form Health Survey (SF 36).
Improvement was seen in both the Physical Component Summary (PCS) and the
Mental Component Summary (MCS).
In Study RA-III, the mean (95%
CI) improvement in HAQ-DI from baseline at Week 52 was 0.60 (0.55, 0.65) for
the adalimumab patients and 0.25 (0.17, 0.33) for placebo/MTX (p<0.001)
patients. Sixty-three percent of adalimumab-treated patients achieved a 0.5 or
greater improvement in HAQ-DI at Week 52 in the double-blind portion of the
study. Eighty-two percent of these patients maintained that improvement through
Week 104 and a similar proportion of patients maintained this response through
Week 260 (5 years) of open-label treatment. Mean improvement in the SF-36 was
maintained through the end of measurement at Week 156 (3 years).
In Study RA-V, the HAQ-DI and
the physical component of the SF-36 showed greater improvement (p<0.001) for
the adalimumab/MTX combination therapy group versus either the MTX monotherapy
or the adalimumab monotherapy group at Week 52, which was maintained through
Week 104.
Juvenile Idiopathic Arthritis
The safety and efficacy of
adalimumab was assessed in Study JIA-I in patients with active polyarticular
juvenile idiopathic arthritis (JIA).
Study JIA-I
The safety and efficacy of
adalimumab were assessed in a multicenter, randomized, withdrawal,
double-blind, parallel-group study in 171 patients who were 4 to 17 years of
age with polyarticular JIA. In the study, the patients were stratified into two
groups: MTX-treated or non MTX-treated. All patients had to show signs of
active moderate or severe disease despite previous treatment with NSAIDs,
analgesics, corticosteroids, or DMARDS. Patients who received prior treatment
with any biologic DMARDS were excluded from the study.
The study included four phases: an open-label lead in
phase (OL-LI; 16 weeks), a double-blind randomized withdrawal phase (DB; 32
weeks), an open-label extension phase (OLE-BSA; up to 136 weeks), and an
open-label fixed dose phase (OLE-FD; 16 weeks). In the first three phases of
the study, adalimumab was administered based on body surface area at a dose of
24 mg/m² up to a maximum total body dose of 40 mg subcutaneously (SC) every
other week. In the OLE-FD phase, the patients were treated with 20 mg of
adalimumab SC every other week if their weight was less than 30 kg and with 40
mg of adalimumab SC every other week if their weight was 30 kg or greater.
Patients remained on stable doses of NSAIDs and or prednisone (≤0.2
mg/kg/day or 10 mg/day maximum).
Patients demonstrating a
Pediatric ACR 30 response at the end of OL-LI phase were randomized into the
double-blind (DB) phase of the study and received either adalimumab or placebo
every other week for 32 weeks or until disease flare. Disease flare was defined
as a worsening of ≥30% from baseline in ≥3 of 6 Pediatric ACR core
criteria, ≥2 active joints, and improvement of >30% in no more than 1
of the 6 criteria. After 32 weeks or at the time of disease flare during the DB
phase, patients were treated in the open-label extension phase based on the BSA
regimen (OLE-BSA), before converting to a fixed dose regimen based on body
weight (OLE-FD phase).
Study JIA-I Clinical Response
At the end of the 16-week OL-LI
phase, 94% of the patients in the MTX stratum and 74% of the patients in the
non-MTX stratum were Pediatric ACR 30 responders. In the DB phase significantly
fewer patients who received adalimumab experienced disease flare compared to
placebo, both without MTX (43% vs. 71%) and with MTX (37% vs. 65%). More
patients treated with adalimumab continued to show Pediatric ACR 30/50/70
responses at Week 48 compared to patients treated with placebo. Pediatric ACR
responses were maintained for up to two years in the OLE phase in patients who
received adalimumab throughout the study.
Psoriatic Arthritis
The safety and efficacy of
adalimumab was assessed in two randomized, double-blind, placebo-controlled
studies in 413 patients with psoriatic arthritis (PsA). Upon completion of both
studies, 383 patients enrolled in an open-label extension study, in which 40 mg
adalimumab was administered every other week.
Study PsA-I enrolled 313 adult
patients with moderately to severely active PsA (>3 swollen and >3 tender
joints) who had an inadequate response to NSAID therapy in one of the following
forms: (1) distal interphalangeal (DIP) involvement (N=23); (2) polyarticular
arthritis (absence of rheumatoid nodules and presence of plaque psoriasis)
(N=210); (3) arthritis mutilans (N=1); (4) asymmetric PsA (N=77); or (5)
AS-like (N=2). Patients on MTX therapy (158 of 313 patients) at enrollment
(stable dose of ≤30 mg/week for >1 month) could continue MTX at the
same dose. Doses of adalimumab 40 mg or placebo every other week were administered
during the 24-week double-blind period of the study.
Compared to placebo, treatment
with adalimumab resulted in improvements in the measures of disease activity
(see Tables 7 and 8). Among patients with PsA who received adalimumab, the
clinical responses were apparent in some patients at the time of the first
visit (two weeks) and were maintained up to 88 weeks in the ongoing open-label
study. Similar responses were seen in patients with each of the subtypes of
psoriatic arthritis, although few patients were enrolled with the arthritis
mutilans and ankylosing spondylitis-like subtypes. Responses were similar in
patients who were or were not receiving concomitant MTX therapy at baseline.
Patients with psoriatic
involvement of at least three percent body surface area (BSA) were evaluated
for Psoriatic Area and Severity Index (PASI) responses. At 24 weeks, the
proportions of patients achieving a 75% or 90% improvement in the PASI were 59%
and 42% respectively, in the adalimumab group (N=69), compared to 1% and 0%
respectively, in the placebo group (N=69) (p<0.001). PASI responses were
apparent in some patients at the time of the first visit (two weeks). Responses
were similar in patients who were or were not receiving concomitant MTX therapy
at baseline.
Table 7: ACR Response in
Study PsA-I (Percent of Patients)
|
Placebo
N=162 |
Adalimumab*
N=151 |
ACR20 |
Week 12 |
14% |
58% |
Week 24 |
15% |
57% |
ACR50 |
Week 12 |
4% |
36% |
Week 24 |
6% |
39% |
ACR70 |
Week 12 |
1% |
20% |
Week 24 |
1% |
23% |
*p<0.001 for all comparisons
between adalimumab and placebo. |
Table 8: Components of Disease Activity in Study PsA-I
Parameter: median |
Placebo
N=162 |
Adalimumab*
N=151 |
Baseline |
24 weeks |
Baseline |
24 weeks |
Number of tender jointsa |
23.0 |
17.0 |
20.0 |
5.0 |
Number of swollen jointsb |
11.0 |
9.0 |
11.0 |
3.0 |
Physician global assessmentc |
53.0 |
49.0 |
55.0 |
16.0 |
Patient global assessmentc |
49.5 |
49.0 |
48.0 |
20.0 |
Painc |
49.0 |
49.0 |
54.0 |
20.0 |
Disability index (HAQ)d |
1.0 |
0.9 |
1.0 |
0.4 |
CRP (mg/dL)e |
0.8 |
0.7 |
0.8 |
0.2 |
*p<0.001 for adalimumab vs. placebo comparisons based
on median changes.
a Scale 0-78.
b Scale 0-76.
cVisual analog scale; 0=best, 100=worst.
d Disability Index of the Health Assessment Questionnaire; 0=best,
3=worst; measures the patientâ⬙s ability to perform the following: dress/groom,
arise, eat, walk, reach, grip, maintain hygiene, and maintain daily activity.
e Normal range: 0-0.287 mg/dL. |
Similar results were seen in an additional, 12-week study
in 100 patients with moderate to severe psoriatic arthritis who had suboptimal
response to DMARD therapy as manifested by ≥3 tender joints and ≥3
swollen joints at enrollment.
Radiographic Response
Radiographic changes were
assessed in the PsA studies. Radiographs of hands, wrists, and feet were
obtained at baseline and Week 24 during the double-blind period when patients were
on adalimumab or placebo and at Week 48 when all patients were on open-label
adalimumab. A modified Total Sharp Score (mTSS), which included distal
interphalangeal joints (i.e., not identical to the TSS used for rheumatoid
arthritis), was used by readers blinded to treatment group to assess the
radiographs.
Adalimumab-treated patients
demonstrated greater inhibition of radiographic progression compared to
placebo-treated patients and this effect was maintained at 48 weeks (see Table
9).
Table 9: Change in Modified
Total Sharp Score in Psoriatic Arthritis
|
Placebo
N=141 |
Adalimumab
N=133 |
Week 24 |
Week 24 |
Week 48 |
Baseline mean |
22.1 |
23.4 |
23.4 |
Mean change ± SD |
0.9 ± 3.1 |
-0.1 ± 1.7 |
-0.2 ± 4.9* |
*<0.001 for the difference between adalimumab, Week 48
and Placebo, Week 24 (primary analysis). |
Physical Function Response
In Study PsA-I, physical function and disability were
assessed using the HAQ Disability Index (HAQ-DI) and the SF-36 Health Survey.
Patients treated with 40 mg of adalimumab every other week showed greater
improvement from baseline in the HAQ-DI score (mean decreases of 47% and 49% at
Weeks 12 and 24, respectively) in comparison to placebo (mean decreases of 1%
and 3% at Weeks 12 and 24, respectively). At Weeks 12 and 24, patients treated
with adalimumab showed greater improvement from baseline in the SF-36 Physical
Component Summary score compared to patients treated with placebo, and no
worsening in the SF-36 Mental Component Summary score. Improvement in physical
function based on the HAQ-DI was maintained for up to 84 weeks through the
open-label portion of the study.
Ankylosing Spondylitis
The safety and efficacy of adalimumab 40 mg every other
week was assessed in 315 adult patients in a randomized, 24 week double-blind,
placebo-controlled study in patients with active ankylosing spondylitis (AS)
who had an inadequate response to glucocorticoids, NSAIDs, analgesics, methotrexate
or sulfasalazine. Active AS was defined as patients who fulfilled at least two
of the following three criteria: (1) a Bath AS disease activity index (BASDAI)
score ≥4 cm, (2) a visual analog score (VAS) for total back pain
≥40 mm, and (3) morning stiffness ≥1 hour. The blinded period was
followed by an open-label period during which patients received adalimumab 40
mg every other week subcutaneously for up to an additional 28 weeks.
Improvement in measures of disease activity was first
observed at Week 2 and maintained through 24 weeks as shown in Figure 2 and
Table 10.
Responses of patients with total spinal ankylosis (n=11)
were similar to those without total ankylosis.
Figure 2: ASAS 20 Response By Visit, Study AS-I
At 12 weeks, the ASAS 20/50/70
responses were achieved by 58%, 38%, and 23%, respectively, of patients
receiving adalimumab, compared to 21%, 10%, and 5% respectively, of patients
receiving placebo (p<0.001). Similar responses were seen at Week 24 and were
sustained in patients receiving open-label adalimumab for up to 52 weeks.
A greater proportion of
patients treated with adalimumab (22%) achieved a low level of disease activity
at 24 weeks (defined as a value <20 [on a scale of 0 to 100 mm] in each of
the four ASAS response parameters) compared to patients treated with placebo
(6%).
Table 10: Components of Ankylosing Spondylitis Disease
Activity
|
Placebo
N=107 |
Adalimumab
N=208 |
Baseline mean |
Week 24 mean |
Baseline mean |
Week 24 mean |
ASAS 20 Response Criteria* |
Patient’s Global Assessment of Disease Activitya* |
65 |
60 |
63 |
38 |
Total back pain* |
67 |
58 |
65 |
37 |
Inflammationb* |
6.7 |
5.6 |
6.7 |
3.6 |
BASFIc* |
56 |
51 |
52 |
34 |
BASDAId score* |
6.3 |
5.5 |
6.3 |
3.7 |
BASMIe score* |
4.2 |
4.1 |
3.8 |
3.3 |
Tragus to wall (cm) |
15.9 |
15.8 |
15.8 |
15.4 |
Lumbar flexion (cm) |
4.1 |
4.0 |
4.2 |
4.4 |
Cervical rotation (degrees) |
42.2 |
42.1 |
48.4 |
51.6 |
Lumbar side flexion (cm) |
8.9 |
9.0 |
9.7 |
11.7 |
Intermalleolar distance (cm) |
92.9 |
94.0 |
93.5 |
100.8 |
CRPf* |
2.2 |
2.0 |
1.8 |
0.6 |
a Percent of subjects with at least a 20% and
10-unit improvement measured on a Visual Analog Scale (VAS) with 0=none and
100=severe.
b Mean of questions 5 and 6 of BASDAI (defined in ââ¬Ëdâ⬙).
cBath Ankylosing Spondylitis Functional Index.
d Bath Ankylosing Spondylitis Disease Activity Index.
e Bath Ankylosing Spondylitis Metrology Index. f C-Reactive Protein
(mg/dL).
* Statistically significant for comparisons between adalimumab and placebo at
Week 24. |
A second randomized, multicenter, double-blind,
placebo-controlled study of 82 patients with ankylosing spondylitis showed
similar results.
Patients treated with adalimumab achieved improvement
from baseline in the Ankylosing Spondylitis Quality of Life Questionnaire
(ASQoL) score (-3.6 vs. -1.1) and in the Short Form Health Survey (SF-36)
Physical Component Summary (PCS) score (7.4 vs. 1.9) compared to
placebo-treated patients at Week 24.
Adult Crohnâ⬙s Disease
The safety and efficacy of multiple doses of adalimumab
were assessed in adult patients with moderately to severely active Crohnâ⬙s
disease, CD, (Crohnâ⬙s Disease Activity Index (CDAI) ≥220 and ≤450)
in randomized, double-blind, placebo-controlled studies. Concomitant stable
doses of aminosalicylates, corticosteroids, and/or immunomodulatory agents were
permitted, and 79% of patients continued to receive at least one of these
medications.
Induction of clinical remission
(defined as CDAI <150) was evaluated in two studies. In Study CD-I, 299 TNF-blocker
naïve patients were randomized to one of four treatment groups: the placebo
group received placebo at Weeks 0 and 2, the 160/80 group received 160 mg
adalimumab at Week 0 and 80 mg at Week 2, the 80/40 group received 80 mg at
Week 0 and 40 mg at Week 2, and the 40/20 group received 40 mg at Week 0 and 20
mg at Week 2. Clinical results were assessed at Week 4.
In the second induction study,
Study CD-II, 325 patients who had lost response to, or were intolerant to,
previous infliximab therapy were randomized to receive either 160 mg adalimumab
at Week 0 and 80 mg at Week 2, or placebo at Weeks 0 and 2. Clinical results
were assessed at Week 4.
Maintenance of clinical
remission was evaluated in Study CD-III. In this study, 854 patients with
active disease received open-label adalimumab, 80 mg at Week 0 and 40 mg at
Week 2. Patients were then randomized at Week 4 to 40 mg adalimumab every other
week, 40 mg adalimumab every week, or placebo. The total study duration was 56
weeks. Patients in clinical response (decrease in CDAI ≥70) at Week 4
were stratified and analyzed separately from those not in clinical response at
Week 4.
Induction Of Clinical Remission
A greater percentage of the
patients treated with 160/80 mg adalimumab achieved induction of clinical
remission versus placebo at Week 4 regardless of whether the patients were TNF
blocker naïve (CD-I), or had lost response to or were intolerant to infliximab
(CD-II) (see Table 11).
Table 11: Induction of
Clinical Remission in Studies CD-I and CD-II (Percent of Patients)
|
CD-I |
CD-II |
Placebo
N=74 |
Adalimumab 160/80 mg
N=76 |
Placebo
N=166 |
Adalimumab 160/80 mg
N=159 |
Week 4 |
Clinical remission |
12% |
36%* |
7% |
21%* |
Clinical response |
34% |
58%** |
34% |
52%** |
Clinical remission is CDAI
score <150; clinical response is decrease in CDAI of at least 70 points.
*p<0.001 for adalimumab vs. placebo pairwise comparison of proportions.
**p<0.01 for adalimumab vs. placebo pairwise comparison of proportions. |
Maintenance Of Clinical
Remission
In Study CD-III at Week 4, 58%
(499/854) of patients were in clinical response and were assessed in the
primary analysis. At Weeks 26 and 56, greater proportions of patients who were
in clinical response at Week 4 achieved clinical remission in the adalimumab 40
mg every other week maintenance group compared to patients in the placebo
maintenance group (see Table 12). The group that received adalimumab therapy
every week did not demonstrate significantly higher remission rates compared to
the group that received adalimumab every other week.
Table 12: Maintenance of
Clinical Remission in CD-III (Percent of Patients)
|
Placebo
N=170 |
40 mg Adalimumab Every Other Week
N=172 |
Week 26 |
Clinical remission |
17% |
40%* |
Clinical response |
28% |
54%* |
Week 56 |
Clinical remission |
12% |
36%* |
Clinical response |
18% |
43%* |
Clinical remission is CDAI
score <150; clinical response is decrease in CDAI of at least 70 points.
*p<0.001 for adalimumab vs. placebo pairwise comparisons of proportions |
Of those in response at Week 4
who attained remission during the study, patients in the adalimumab every other
week group maintained remission for a longer time than patients in the placebo
maintenance group. Among patients who were not in response by Week 12, therapy
continued beyond 12 weeks did not result in significantly more responses.
Ulcerative Colitis
The safety and efficacy of
adalimumab were assessed in adult patients with moderately to severely active
ulcerative colitis (Mayo score 6 to 12 on a 12 point scale, with an endoscopy
subscore of 2 to 3 on a scale of 0 to 3) despite concurrent or prior treatment
with immunosuppressants such as corticosteroids, azathioprine, or 6-MP in two
randomized, double-blind, placebo-controlled clinical studies (Studies UC-I and
UC-II). Both studies enrolled TNF-blocker naïve patients, but Study UC-II also
allowed entry of patients who lost response to or were intolerant to
TNF-blockers. Forty percent (40%) of patients enrolled in Study UC-II had
previously used another TNF-blocker.
Concomitant stable doses of
aminosalicylates and immunosuppressants were permitted. In Studies UC-I and II,
patients were receiving aminosalicylates (69%), corticosteroids (59%) and/or
azathioprine or 6-MP (37%) at baseline. In both studies, 92% of patients
received at least one of these medications.
Induction of clinical remission
(defined as Mayo score ≤2 with no individual subscores >1) at Week 8
was evaluated in both studies. Clinical remission at Week 52 and sustained
clinical remission (defined as clinical remission at both Weeks 8 and 52) were
evaluated in Study UC-II.
In Study UC-I, 390 TNF-blocker
naïve patients were randomized to one of three treatment groups for the primary
efficacy analysis. The placebo group received placebo at Weeks 0, 2, 4 and 6.
The 160/80 group received 160 mg adalimumab at Week 0 and 80 mg at Week 2, and
the 80/40 group received 80 mg adalimumab at Week 0 and 40 mg at Week 2. After
Week 2, patients in both adalimumab treatment groups received 40 mg every other
week.
In Study UC-II, 518 patients
were randomized to receive either adalimumab 160 mg at Week 0, 80 mg at Week 2,
and 40 mg every other week starting at Week 4 through Week 50, or placebo
starting at Week 0 and every other week through Week 50. Corticosteroid taper
was permitted starting at Week 8.
In both Studies UC-I and UC-II,
a greater percentage of the patients treated with 160/80 mg of adalimumab
compared to patients treated with placebo achieved induction of clinical
remission. In Study UC-II, a greater percentage of the patients treated with
160/80 mg of adalimumab compared to patients treated with placebo achieved
sustained clinical remission (clinical remission at both Weeks 8 and 52) (Table
13).
Table 13: Induction of
Clinical Remission in Studies UC-I and UC-II and Sustained Clinical Remission
in Study UC-II (Percent of Patients)
|
Study UC-I |
Study UC-II |
Placebo
N=130 |
Adalimumab 160/80 mg
N=130 |
Treatment Difference (95% CI) |
Placebo
N=246 |
Adalimumab 160/80 mg
N=248 |
Treatment Difference (95% CI) |
Induction of Clinical Remission (Clinical Remission at Week 8) |
9.2% |
18.5% |
9.3%*
(0.9%, 17.6%) |
9.3% |
16.5% |
7.2%*
(1.2%, 12.9%) |
Sustained Clinical Remission (Clinical Remission at both Weeks 8 and 52) |
N/A |
N/A |
N/A |
4.1% |
8.5% |
4.4%*
(0.1%, 8.6%) |
Clinical remission is defined
as Mayo score ≤2 with no individual subscores >1. CI=Confidence
interval.
*p<0.05 for adalimumab vs. placebo pairwise comparison of proportions. |
In Study UC-I, there was no
statistically significant difference in clinical remission observed between the
adalimumab 80/40 mg group and the placebo group at Week 8.
In Study UC-II, 17.3% (43/248)
in the adalimumab group were in clinical remission at Week 52 compared to 8.5%
(21/246) in the placebo group (treatment difference: 8.8%; 95% confidence
interval (CI): [2.8%, 14.5%]; p<0.05).
In the subgroup of patients in
Study UC-II with prior TNF-blocker use, the treatment difference for induction
of clinical remission appeared to be lower than that seen in the whole study
population, and the treatment differences for sustained clinical remission and
clinical remission at Week 52 appeared to be similar to those seen in the whole
study population. The subgroup of patients with prior TNF-blocker use achieved
induction of clinical remission at 9% (9/98) in the adalimumab group versus 7%
(7/101) in the placebo group, and sustained clinical remission at 5% (5/98) in
the adalimumab group versus 1% (1/101) in the placebo group. In the subgroup of
patients with prior TNF-blocker use, 10% (10/98) were in clinical remission at
Week 52 in the adalimumab group versus 3% (3/101) in the placebo group.
Plaque Psoriasis
The safety and efficacy of
adalimumab were assessed in randomized, double-blind, placebo-controlled
studies in 1696 adult subjects with moderate to severe chronic plaque psoriasis
(Ps) who were candidates for systemic therapy or phototherapy.
Study Ps-I evaluated 1212
subjects with chronic Ps with ≥10% body surface area (BSA) involvement,
Physicianâ⬙s Global Assessment (PGA) of at least moderate disease severity, and
Psoriasis Area and Severity Index (PASI) ≥12 within three treatment
periods. In period A, subjects received placebo or adalimumab at an initial
dose of 80 mg at Week 0 followed by a dose of 40 mg every other week starting
at Week 1. After 16 weeks of therapy, subjects who achieved at least a PASI 75
response at Week 16, defined as a PASI score improvement of at least 75%
relative to baseline, entered period B and received open-label 40 mg adalimumab
every other week. After 17 weeks of open label therapy, subjects who maintained
at least a PASI 75 response at Week 33 and were originally randomized to active
therapy in period A were re-randomized in period C to receive 40 mg adalimumab
every other week or placebo for an additional 19 weeks. Across all treatment
groups the mean baseline PASI score was 19 and the baseline Physicianâ⬙s Global
Assessment score ranged from “moderate” (53%) to “severe” (41%) to “very
severe” (6%).
Study Ps-II evaluated 99
subjects randomized to adalimumab and 48 subjects randomized to placebo with
chronic plaque psoriasis with ≥10% BSA involvement and PASI ≥12.
Subjects received placebo, or an initial dose of 80 mg adalimumab at Week 0
followed by 40 mg every other week starting at Week 1 for 16 weeks. Across all
treatment groups the mean baseline PASI score was 21 and the baseline PGA score
ranged from “moderate” (41%) to “severe” (51%) to “very severe” (8%).
Studies Ps-I and II evaluated
the proportion of subjects who achieved “clear” or “minimal” disease on the
6-point PGA scale and the proportion of subjects who achieved a reduction in
PASI score of at least 75% (PASI 75) from baseline at Week 16 (see Tables 14
and 15).
Additionally, Study Ps-I
evaluated the proportion of subjects who maintained a PGA of “clear” or
“minimal” disease or a PASI 75 response after Week 33 and on or before Week 52.
Table 14: Efficacy Results at 16 Weeks in Study Ps-I
Number of Subjects (%)
|
Adalimumab 40 mg Every Other Week
N=814 |
Placebo
N=398 |
PGA: Clear or minimal* |
506 (62%) |
17 (4%) |
PASI 75 |
578 (71%) |
26 (7%) |
*Clear = no plaque elevation, no scale, plus or minus
hyperpigmentation or diffuse pink or red coloration. Minimal = possible but
difficult to ascertain whether there is slight elevation of plaque above normal
skin, plus or minus surface dryness with some white coloration, plus or minus
up to red coloration. |
Table 15: Efficacy Results at 16 Weeks in Study Ps-II
Number of Subjects (%)
|
Adalimumab 40 mg Every Other Week
N=99 |
Placebo
N=48 |
PGA: Clear or minimal* |
70 (71%) |
5 (10%) |
PASI 75 |
77 (78%) |
9 (19%) |
*Clear = no plaque elevation, no scale, plus or minus hyperpigmentation
or diffuse pink or red coloration. Minimal = possible but difficult to
ascertain whether there is slight elevation of plaque above normal skin, plus
or minus surface dryness with some white coloration, plus or minus up to red
coloration. |
Additionally, in Study Ps-I,
subjects on adalimumab who maintained a PASI 75 were re-randomized to
adalimumab (N = 250) or placebo (N = 240) at Week 33. After 52 weeks of
treatment with adalimumab, more subjects on adalimumab maintained efficacy when
compared to subjects who were re-randomized to placebo based on maintenance of
PGA of “clear” or “minimal” disease (68% vs. 28%) or a PASI 75 (79% vs. 43%).
A total of 347 stable
responders participated in a withdrawal and retreatment evaluation in an
open-label extension study. Median time to relapse (decline to PGA “moderate”
or worse) was approximately 5 months. During the withdrawal period, no subject
experienced transformation to either pustular or erythrodermic psoriasis. A
total of 178 subjects who relapsed re-initiated treatment with 80 mg of
adalimumab, then 40 mg every other week beginning at Week 1. At Week 16, 69%
(123/178) of subjects had a response of PGA “clear” or “minimal”.
A randomized, double-blind
study (Study Ps-III) compared the efficacy and safety of adalimumab versus
placebo in 217 adult subjects. Subjects in the study had to have chronic plaque
psoriasis of at least moderate severity on the PGA scale, fingernail
involvement of at least moderate severity on a 5-point Physicianâ⬙s Global Assessment
of Fingernail Psoriasis (PGA-F) scale, a Modified Nail Psoriasis Severity Index
(mNAPSI) score for the target-fingernail of ≥8, and either a BSA
involvement of at least 10% or a BSA involvement of at least 5% with a total
mNAPSI score for all fingernails of ≥20. Subjects received an initial
dose of 80 mg adalimumab followed by 40 mg every other week (starting one week
after the initial dose) or placebo for 26 weeks followed by open-label
adalimumab treatment for an additional 26 weeks. This study evaluated the
proportion of subjects who achieved “clear” or “minimal” assessment with at
least a 2-grade improvement on the PGA-F scale and the proportion of subjects
who achieved at least a 75% improvement from baseline in the mNAPSI score
(mNAPSI 75) at Week 26.
At Week 26, a higher proportion
of subjects in the adalimumab group than in the placebo group achieved the
PGA-F endpoint. Furthermore, a higher proportion of subjects in the adalimumab
group than in the placebo group achieved mNAPSI 75 at Week 26 (see Table 16).
Table 16: Efficacy Results at 26 Weeks
Endpoint |
Adalimumab 40 mg Every Other Week*
N=109 |
Placebo
N=108 |
PGA-F: ≥2-grade improvement and clear or minimal |
49% |
7% |
mNAPSI 75 |
47% |
3% |
*Subjects received 80 mg of
adalimumab at Week 0, followed by 40 mg every other week starting at Week 1. |
Nail pain was also evaluated
and improvement in nail pain was observed in Study Ps-III.