Pharmacotherapeutic group: Immunosupressants, selective immunosuppressants, ATC code:
L04AA32
Mechanism of actionApremilast, an oral small-molecule inhibitor of phosphodiesterase 4 (PDE4), works intracellularly tomodulate a network of pro-inflammatory and anti-inflammatory mediators. PDE4 is a cyclic adenosinemonophosphate (cAMP)-specific PDE and the dominant PDE in inflammatory cells. PDE4 inhibitionelevates intracellular cAMP levels, which in turn down-regulates the inflammatory response bymodulating the expression of TNF-α, IL-23, IL-17 and other inflammatory cytokines. Cyclic AMPalso modulates levels of anti-inflammatory cytokines such as IL-10. These pro- and anti-inflammatorymediators have been implicated in psoriatic arthritis and psoriasis.
Pharmacodynamic effectsIn clinical studies in patients with psoriatic arthritis, apremilast significantly modulated, but did notfully inhibit, plasma protein levels of IL-1α, IL-6, IL-8, MCP-1, MIP-1β, MMP-3, and TNF-α. After40 weeks of treatment with apremilast, there was a decrease in plasma protein levels of IL-17 and
IL-23, and an increase in IL-10. In clinical studies in patients with psoriasis, apremilast decreasedlesional skin epidermal thickness, inflammatory cell infiltration, and expression of pro-inflammatorygenes, including those for inducible nitric oxide synthase (iNOS), IL-12/IL-23p40, IL-17A, IL-22 and
IL-8. In clinical studies in patients with Behçet Disease treated with apremilast, there was a significantpositive association between the change in plasma TNF-alpha and clinical efficacy as measured by thenumber of oral ulcers.
Apremilast administered at doses of up to 50 mg twice daily did not prolong the QT interval in healthysubjects.
Clinical efficacy and safetyPsoriatic Arthritis
The safety and efficacy of apremilast were evaluated in 3 multi-centre, randomised, double-blind,placebo-controlled studies (Studies PALACE 1, PALACE 2, and PALACE 3) of similar design inadult patients with active PsA (≥ 3 swollen joints and ≥ 3 tender joints) despite prior treatment withsmall molecule or biologic DMARDs. A total of 1 493 patients were randomised and treated witheither placebo, apremilast 20 mg or apremilast 30 mg given orally twice daily.
Patients in these studies had a diagnosis of PsA for at least 6 months. One qualifying psoriatic skinlesion (at least 2 cm in diameter) was also required in PALACE 3. Apremilast was used as amonotherapy (34.8%) or in combination with stable doses of small molecule DMARDs (65.2%).
Patients received apremilast in combination with one or more of the following: methotrexate (MTX,≤ 25 mg/week, 54.5%), sulfasalazine (SSZ, ≤ 2 g/day, 9.0%), and leflunomide (LEF; ≤ 20 mg/day,7.4%). Concomitant treatment with biologic DMARDs, including TNF blockers, was not allowed.
Patients with each subtype of PsA were enrolled in the 3 studies, including symmetric polyarthritis(62.0%), asymmetric oligoarthritis (26.9%), distal interphalangeal (DIP) joint arthritis (6.2%), arthritismutilans (2.7%), and predominant spondylitis (2.1%). Patients with pre-existing enthesopathy (63%)or pre-existing dactylitis (42%) were enrolled. A total of 76.4% of patients were previously treatedwith only small-molecule DMARDs and 22.4% of patients were previously treated with biologic
DMARDs, which includes 7.8% who had a therapeutic failure with a prior biologic DMARD. Themedian duration of PsA disease was 5 years.
Based on the study design, patients whose tender and swollen joint counts had not improved by at least20% were considered non-responders at week 16. Placebo patients who were considered non-responders were re-randomised 1:1 in a blinded fashion to either apremilast 20 mg twice daily or30 mg twice daily. At week 24, all remaining placebo-treated patients were switched to eitherapremilast 20 or 30 mg twice daily. Following 52 weeks of treatment, patients could continue on openlabel apremilast 20 mg or 30 mg within the long-term extension of the PALACE 1, PALACE 2, and
PALACE 3 studies for a total duration of treatment up to 5 years (260 weeks).
The primary endpoint was the percentage of patients achieving American College of Rheumatology(ACR) 20 response at week 16.
Treatment with apremilast resulted in significant improvements in the signs and symptoms of PsA, asassessed by the ACR 20 response criteria compared to placebo at weeks 16. The proportion of patientswith ACR 20/50/70 (responses in studies PALACE 1, PALACE 2 and PALACE 3, and the pooleddata for studies PALACE 1, PALACE 2 and PALACE 3) for apremilast 30 mg twice daily at week 16are shown in table 4. ACR 20/50/70 responses were maintained at week 24.
Among patients who were initially randomised to apremilast 30 mg twice daily treatment, ACR20/50/70 response rates were maintained through week 52 in the pooled studies PALACE 1,
PALACE 2 and PALACE 3 (figure 1).
Table 4. Proportion of patients with ACR responses in studies PALACE 1, PALACE 2 and
PALACE 3 and pooled studies at week 16
PALACE 1 PALACE 2 PALACE 3 POOLED
Placebo Apremilast Placebo Apremilast Placebo Apremilast Placebo Apremilast30 mg 30 mg 30 mg 30 mg+/- twice daily +/- twice daily +/- twice daily +/- twice daily
DMARDsN +/- DMARDsN +/- DMARDsN +/- DMARDsN +/-
Na = 168 DMARDsN = 159 DMARDsN = 169 DMARDsN = 496 DMARDsN= 168 = 162 = 167 = 497
ACRa
Week19.0% 38.1%** 18.9% 32.1%* 18.3% 40.7%** 18.8% 37.0%**
ACR
Week6.0% 16.1%* 5.0% 10.5% 8.3% 15.0% 6.5% 13.9%**
ACR
Week1.2% 4.2% 0.6% 1.2% 2.4% 3.6% 1.4% 3.0%
*p ≤ 0.01 for apremilast vs. placebo
**p ≤ 0.001 for apremilast vs. placeboa N is the number of patients as randomised and treated
Figure 1 Proportion of ACR 20/50/70 responders through week 52 in the pooled analysis ofstudies PALACE 1, PALACE 2 and PALACE 3 (NRI*)0 16 24 40 52
Study Week
Endpoint n/m (%) n/m (%) n/m (%) n/m (%)
ACR 20 184/497 (37.0) 196/497 (39.4) 222/497 (44.7) 209/497 (42.1)
ACR 50 69/497 (13.9) 93/497 (18.7) 102/497 (20.5) 90/497 (18.1)
ACR 70 15/497 ( 3.0) 33/497 ( 6.6) 44/497 ( 8.9) 38/497 ( 7.6)
Endpoint ACR 20 ACR 50 ACR 70
*NRI: None responder imputation. Subjects who discontinued early prior to the time point and subjects who did not have sufficient data for adefinitive determination of response status at the time point are counted as non-responders.
Among 497 patients initially randomised to apremilast 30 mg twice daily, 375 (75%) patients werestill on this treatment on week 52. In these patients, ACR 20/50/70 responses at week 52 were of 57%,25%, and 11% respectively. Among 497 patients initially randomised to apremilast 30 mg twice daily,
Response Rate +/- SE (%)375 (75%) patients entered the long term extension studies, and of these, 221 patients (59%) were stillon this treatment at week 260. ACR responses were maintained in the long-term open label extensionstudies for up to 5 years.
Responses observed in the apremilast treated group were similar in patients receiving and notreceiving concomitant DMARDs, including MTX. Patients previously treated with DMARDs orbiologics who received apremilast achieved a greater ACR 20 response at week 16 than patientsreceiving placebo.
Similar ACR responses were observed in patients with different PsA subtypes, including DIP. Thenumber of patients with arthritis mutilans and predominant spondylitis subtypes was too small to allowmeaningful assessment.
In PALACE 1, PALACE 2 and PALACE 3, improvements in Disease Activity Scale (DAS) 28
C-reactive protein (CRP) and in the proportion of patients achieving a modified PsA response criteria(PsARC) were greater in the apremilast group, compared to placebo at week 16 (nominal p-valuep < 0.0004, p-value ≤ 0.0017, respectively). These improvements were maintained at week 24. Amongpatients who remained on the apremilast treatment to which they were randomised at study start,
DAS28 (CRP) score and PsARC response were maintained through week 52.
At weeks 16 and 24 improvements in parameters of peripheral activity characteristic of psoriaticarthritis (e.g. number of swollen joints, number of painful/tender joints, dactylitis and enthesitis) andin the skin manifestations of psoriasis were seen in the apremilast-treated patients. Among patientswho remained on the apremilast treatment to which they were randomised at study start, theseimprovements were maintained through week 52.
The clinical responses were maintained in the same parameters of peripheral activity and in the skinmanifestations of psoriasis in the open-label extension studies for up to 5 years of treatment.
Physical function and health-related quality of lifeApremilast-treated patients demonstrated statistically significant improvement in physical function, asassessed by the disability index of the health assessment questionnaire (HAQ-DI) change frombaseline, compared to placebo at weeks 16 in PALACE 1, PALACE 2 and PALACE 3 and in thepooled studies. Improvement in HAQ-DI scores was maintained at week 24.
Among patients who were initially randomised to apremilast 30 mg twice daily treatment, the changefrom baseline in the HAQ-DI score at week 52 was -0.333 in the apremilast 30 mg twice daily groupin a pooled analysis of the open label phase of studies PALACE 1, PALACE 2 and PALACE 3.
In studies PALACE 1, PALACE 2 and PALACE 3, significant improvements were demonstrated inhealth-related quality of life, as measured by the changes from baseline in the physical functioning(PF) domain of the Short Form Health Survey version 2 (SF-36v2), and in the Functional Assessmentof Chronic Illness Therapy - Fatigue (FACIT-fatigue) scores in patients treated with apremilastcompared to placebo at weeks 16 and 24. Among patients who remained on the apremilast treatment,to which they were initially randomised at study start, improvement in physical function and FACIT-fatigue was maintained through week 52.
Improved physical function as assessed by the HAQ-DI and the SF36v2PF domain, and the FACIT-fatigue scores were maintained in the open-label extension studies for up to 5 years of treatment.
Adult psoriasisThe safety and efficacy of apremilast were evaluated in two multicentre, randomised, double-blind,placebo-controlled studies (Studies ESTEEM 1 and ESTEEM 2) which enrolled a total of1 257 patients with moderate to severe plaque psoriasis who had a body surface area (BSA)involvement of ≥ 10%, Psoriasis Area and Severity Index (PASI) score ≥ 12, static Physician Global
Assessment (sPGA) of ≥ 3 (moderate or severe), and who were candidates for phototherapy orsystemic therapy.
These studies had a similar design through week 32. In both studies, patients were randomised 2:1 toapremilast 30 mg twice daily or placebo for 16 weeks (placebo-controlled phase) and fromweeks 16-32, all patients received apremilast 30 mg twice daily (maintenance phase). During the
Randomised Treatment Withdrawal Phase (weeks 32-52), patients originally randomised to apremilastwho achieved at least a 75% reduction in their PASI score (PASI-75) (ESTEEM 1) or a 50% reductionin their PASI score (PASI-50) (ESTEEM 2) were re-randomised at week 32 to either placebo orapremilast 30 mg twice daily. Patients who were re-randomised to placebo and who lost PASI-75response (ESTEEM 1) or lost 50% of the PASI improvement at week 32 compared to baseline(ESTEEM 2) were retreated with apremilast 30 mg twice daily. Patients who did not achieve thedesignated PASI response by week 32, or who were initially randomised to placebo, remained onapremilast until week 52. The use of low potency topical corticosteroids on the face, axillae, and groin,coal tar shampoo and/or salicylic acid scalp preparations was permitted throughout the studies. Inaddition, at week 32, subjects who did not achieve a PASI-75 response in ESTEEM 1, or a PASI-50response in ESTEEM 2, were permitted to use topical psoriasis therapies and/or phototherapy inaddition to apremilast 30 mg twice daily treatment.
Following 52 weeks of treatment, patients could continue on open-label apremilast 30 mg within thelong-term extension of the ESTEEM 1 and ESTEEM 2 studies for a total duration of treatment up to5 years (260 weeks).
In both studies, the primary endpoint was the proportion of patients who achieved PASI-75 atweek 16. The major secondary endpoint was the proportion of patients who achieved a sPGA score ofclear (0) or almost clear (1) at week 16.
The mean baseline PASI score was 19.07 (median 16.80), and the proportion of patients with sPGAscore of 3 (moderate) and 4 (severe) at baseline was 70.0% and 29.8%, respectively with a meanbaseline BSA involvement of 25.19% (median 21.0%). Approximately 30% of all patients hadreceived prior phototherapy and 54% had received prior conventional systemic and/or biologic therapyfor the treatment of psoriasis (including treatment failures), with 37% receiving prior conventionalsystemic therapy and 30% receiving prior biologic therapy. Approximately one-third of patients hadnot received prior phototherapy, conventional systemic or biologic therapy. A total of 18% of patientshad a history of psoriatic arthritis.
The proportion of patients achieving PASI-50, -75 and -90 responses, and sPGA score of clear (0) oralmost clear (1), are presented in table 5 below. Treatment with apremilast resulted in significantimprovement in moderate to severe plaque psoriasis as demonstrated by the proportion of patients with
PASI-75 response at week 16, compared to placebo. Clinical improvement measured by sPGA,
PASI-50 and PASI-90 responses were also demonstrated at week 16. In addition, apremilastdemonstrated a treatment benefit across multiple manifestations of psoriasis including pruritus, naildisease, scalp involvement and quality of life measures.
Table 5. Clinical response at week 16 in studies ESTEEM 1 and ESTEEM 2 (FASa, LOCFb)
ESTEEM 1 ESTEEM 2
Placebo 30 mg twice daily Placebo 30 mg twice daily
APR* APR*
N 282 562 137 274
PASIc 75, n (%) 15 (5.3) 186 (33.1) 8 (5.8) 79 (28.8)sPGAd of clear or11 (3.9) 122 (21.7) 6 (4.4) 56 (20.4)almost clear, n (%)
PASI 50, n (%) 48 (17.0) 330 (58.7) 27 (19.7) 152 (55.5)
PASI 90, n (%) 1 (0.4) 55 (9.8) 2 (1.5) 24 (8.8)
Percent change BSAe (%) -6.9 -47.8 -6.1 -48.4mean ± SD ± 38.95 ± 38.48 ± 47.57 ± 40.78
Change in pruritus VASf -7.3 -31.5 -12.2 -33.5(mm), mean ± SD ± 27.08 ± 32.43 ± 30.94 ± 35.46
Change in DLQIg, -2.1 -6.6 -2.8 -6.7mean ± SD ± 5.69 ± 6.66 ± 7.22 ± 6.95
Change in SF-36 MCS h, -1.02 2.39 0.00 2.58mean ± SD ± 9.161 ± 9.504 ± 10.498 ± 10.129
* p < 0.0001 for apremilast vs placebo, except for ESTEEM 2 PASI 90 and Change in SF-36 MCS wherep = 0.0042 and p = 0.0078, respectively.a FAS = Full Analysis Setb LOCF = Last Observation Carried Forwardc PASI = Psoriasis Area and Severity Indexd sPGA = Static Physician Global Assessmente BSA = Body Surface Areaf VAS = Visual Analog Scale; 0 = best, 100 = worstg DLQI = Dermatology Life Quality Index; 0 = best, 30 = worsth SF-36 MCS = Medical Outcome Study Short Form 36-Item Health Survey, Mental Component Summary
The clinical benefit of apremilast was demonstrated across multiple subgroups defined by baselinedemographics and baseline clinical disease characteristics (including psoriasis disease duration andpatients with a history of psoriatic arthritis). The clinical benefit of apremilast was also demonstratedregardless of prior psoriasis medication usage and response to prior psoriasis treatments. Similarresponse rates were observed across all weight ranges.
Response to apremilast was rapid, with significantly greater improvements in the signs and symptomsof psoriasis, including PASI, skin discomfort/pain and pruritus, compared to placebo by week 2. Ingeneral, PASI responses were achieved by week 16 and were maintained through week 32.
In both studies, the mean percent improvement in PASI from baseline remained stable during therandomised treatment withdrawal phase for patients re-randomised to apremilast at week 32 (table 6).
Table 6. Persistence of effect among subjects randomised to APR 30 twice daily at week 0and re-randomised to APR 30 twice daily at week 32 to week 52
ESTEEM 1 ESTEEM 2
Patients who achieved PASI-75 Patients who achieved
Time Pointat week 32 PASI-50 at week 32
Percent Change Week 16 -77.7 ± 20.30 -69.7 ± 24.23in PASI from Week 32 -88 ± 8.30 -76.7 ± 13.42baseline, meana Week 52 -80.5 ± 12.60 -74.4 ± 18.91(%) ± SD
ESTEEM 1 ESTEEM 2
Patients who achieved PASI-75 Patients who achieved
Time Pointat week 32 PASI-50 at week 32
Change in DLQI Week 16 -8.3 ± 6.26 -7.8 ± 6.41from baseline, Week 32 -8.9 ± 6.68 -7.7 ± 5.92mean ± SDa Week 52 -7.8 ± 5.75 -7.5 ± 6.27
Proportion of Week 16 40/48 (83.3) 21/37 (56.8)subjects with Week 32 39/48 (81.3) 27/37 (73.0)
Scalp Psoriasis
PGA (ScPGA) 0 Week 52 35/48 (72.9) 20/37 (54.1)or 1, n/N (%)ba Includes subjects re-randomised to APR 30 twice daily at week 32 with a baseline value and a post-baselinevalue at the evaluated study week.b N is based on subjects with moderate or greater scalp psoriasis at baseline who were re-randomised to APR 30twice daily at week 32. Subjects with missing data were counted as nonresponders.
In study ESTEEM 1, approximately 61% of patients re-randomised to apremilast at week 32 had a
PASI-75 response at week 52. Of the patients with at least a PASI-75 response who werere-randomised to placebo at week 32 during a randomised treatment withdrawal phase, 11.7% were
PASI-75 responders at week 52. The median time to loss of PASI-75 response among the patientsre-randomised to placebo was 5.1 weeks.
In study ESTEEM 2, approximately 80.3% of patients re-randomised to apremilast at week 32 had a
PASI-50 response at week 52. Of the patients with at least a PASI-50 response who were re-randomised to placebo at week 32, 24.2% were PASI-50 responders at week 52. The median time toloss of 50% of their week 32 PASI improvement was 12.4 weeks.
After randomised withdrawal from therapy at week 32, approximately 70% of patients in study
ESTEEM 1, and 65.6% of patients in study ESTEEM 2, regained PASI-75 (ESTEEM 1) or PASI-50(ESTEEM 2) responses after re-initiation of apremilast treatment. Due to the study design the durationof re-treatment was variable, and ranged from 2.6 to 22.1 weeks.
In study ESTEEM 1, patients randomised to apremilast at the start of the study who did not achieve a
PASI-75 response at week 32 were permitted to use concomitant topical therapies and/or UVBphototherapy between weeks 32 to 52. Of these patients, 12% achieved a PASI-75 response atweek 52 with apremilast plus topical and/or phototherapy treatment.
In studies ESTEEM 1 and ESTEEM 2, significant improvements (reductions) in nail psoriasis, asmeasured by the mean percent change in Nail Psoriasis Severity Index (NAPSI) from baseline, wereobserved in patients receiving apremilast compared to placebo-treated patients at week 16 (p < 0.0001and p = 0.0052, respectively). Further improvements in nail psoriasis were observed at week 32 inpatients continuously treated with apremilast.
In studies ESTEEM 1 and ESTEEM 2, significant improvements in scalp psoriasis of at least moderateseverity (≥ 3), measured by the proportion of patients achieving Scalp Psoriasis Physician’s Global
Assessment (ScPGA) of clear (0) or minimal (1) at week 16, were observed in patients receivingapremilast compared to placebo-treated patients (p < 0.0001 for both studies). The improvements weregenerally maintained in subjects who were re-randomised to apremilast at week 32 through week 52(table 6).
In studies ESTEEM 1 and ESTEEM 2, significant improvements in quality of life as measured by the
Dermatology Life Quality Index (DLQI) and the SF-36v2MCS were demonstrated in patientsreceiving apremilast compared with placebo-treated patients (table 5). Improvements in DLQI weremaintained through week 52 in subjects who were re-randomised to apremilast at week 32 (table 6). Inaddition, in study ESTEEM 1, significant improvement in the Work Limitations Questionnaire (WLQ-25) Index was achieved in patients receiving apremilast compared to placebo.
Among 832 patients initially randomised to apremilast 30 mg twice daily, 443 patients (53%) enteredthe open-label extension studies of ESTEEM 1 and ESTEEM 2, and of these 115 patients (26%) werestill on treatment at week 260. For patients who remained on apremilast in the open label extension of
ESTEEM 1 and ESTEEM 2 studies, improvements were generally maintained in PASI score, affected
BSA, itch, nail and quality of life measures for up to 5 years.
The long-term safety of apremilast 30 mg twice daily in patients with psoriatic arthritis and psoriasiswas assessed for a total duration of treatment up to 5 years. Long-term experience in open-labelextension studies with apremilast was generally comparable to the 52-week studies.
Paediatric psoriasis
A multicentre, randomised, double blind, placebo- controlled trial (SPROUT) was conducted in245 paediatric subjects 6 to 17 years of age (inclusive) with moderate to severe plaque psoriasis whowere candidates for phototherapy or systemic therapy. Enrolled subjects had an sPGA score of ≥ 3(moderate or severe disease), BSA involvement of ≥ 10%, and PASI score of ≥ 12, with psoriasis thatwas inadequately controlled by or inappropriate for topical therapy.
Subjects were randomised 2:1 to receive either apremilast (n = 163) or placebo (n = 82) for 16 weeks.
Subjects with a baseline weight of 20 kg to < 50 kg received apremilast 20 mg twice daily or placebotwice daily, and subjects with a baseline weight ≥ 50 kg received apremilast 30 mg twice daily orplacebo twice daily. At week 16, the placebo group was switched to receive apremilast (with dosebased on baseline weight) and the apremilast group remained on drug (according to their originaldosing assignment) through week 52. Subjects were allowed to use low-potency or weak topicalcorticosteroids on the face, axilla, and groin and unmedicated skin moisturizers for body lesions only.
The primary endpoint was the proportion of subjects who achieved an sPGA response (defined as ascore of clear [0] or almost clear [1] with at least a 2-point reduction from baseline) at week 16. Thekey secondary endpoint was the proportion of subjects who achieved a PASI-75 response (at least a75% reduction in PASI score from baseline) at week 16. Other endpoints at week 16 included theproportions of subjects who achieved a PASI-50 response (at least 50% reduction in PASI score frombaseline), PASI-90 response (at least 90% reduction in PASI score from baseline), and Children’s
Dermatology Life Quality Index (CDLQI) response (CDLQI total score of 0 or 1), percent changefrom baseline in affected BSA, change from baseline in PASI score, and change from baseline in the
CDLQI total score.
Enrolled subjects ranged in age from 6 to 17 years, with a median age of 13 years; 41.2% of subjectswere 6 to 11 years of age and 58.8% of subjects were 12 to 17 years of age. The mean baseline BSAinvolvement was 31.5% (median 26.0%), the mean baseline PASI score was 19.8 (median 17.2), andthe proportions of subjects with an sPGA score of 3 (moderate) and 4 (severe) at baseline were 75.5%and 24.5%, respectively. Of the enrolled subjects, 82.9% did not receive prior conventional systemictherapy, 82.4% did not receive prior phototherapy and 94.3% were biologic-naïve.
The efficacy results at week 16 are presented in table 7.
Table 7. Efficacy results at week 16 in paediatric subjects with moderate to severe plaquepsoriasis (ITT population)
SPROUT
Endpointa Placebo Apremilast
Number of subjects randomised N = 82 N = 163sPGA responseb 11.5% 33.1%
PASI-75 responseb 16.1% 45.4%
PASI-50 responseb 32.1% 70.5%
PASI-90 responseb 4.9% 25.2%
SPROUT
Endpointa Placebo Apremilast
Percent change from baseline in affected BSAc -21.82 ± 5.104 -56.59 ± 3.558
Change from baseline in CDLQI scorec, d -3.2 ± 0.45 -5.1 ± 0.31
Number of subjects with baseline CDLQI score ≥ 2 N=76 N=148
CDLQI responseb 31.3% 35.4%
BSA = body surface area; CDLQI = Children’s Dermatology Life Quality Index; ITT = intent to treat;; PASI = Psoriasis
Area and Severity Index; sPGA = Static Physician Global Assessment;a Apremilast 20 or 30 mg twice daily vs. placebo at week 16; p-value < 0.0001 for sPGA response and PASI-75 response,nominal p-value < 0.01 for all other end points except CDLQI response (nominal p-value 0.5616)b Proportion of subjects who achieved the responsec Least squares mean +/- standard errord 0 = best score, 30 = worst score
The mean percent change from baseline in total PASI score in apremilast-treated and placebo-treatedsubjects during the placebo-controlled phase is presented in figure 2.
Figure 2. Percent change from baseline in total PASI score through week 16 (ITT population;
MI)
Among patients originally randomised to apremilast, sPGA response, PASI-75 response, and the otherendpoints achieved at week 16 were maintained through week 52.
Behçet’s disease
The safety and efficacy of apremilast were evaluated in a phase 3, multicentre, randomised,placebo-controlled study (RELIEF) in adult patients with active Behçet’s Disease (BD) with oralulcers. Patients were previously treated with at least one non-biologic BD medication for oral ulcersand were candidates for systemic therapy. Concomitant treatment for BD was not allowed. Thepopulation studied met the International Study Group (ISG) criteria for BD with a history of skinlesions (98.6%), genital ulcers (90.3%), musculoskeletal (72.5%), ocular (17.4%), central nervoussystem (9.7%) or GI manifestations (9.2%), epididymitis (2.4%) and vascular involvement (1.4%).
Patients with severe BD, defined as those with active major organ involvement (for ex.
meningoencephalitis or pulmonary artery aneurysm) were excluded.
A total of 207 BD patients were randomised 1:1 to receive either apremilast 30 mg twice daily(n = 104) or placebo (n = 103) for 12-weeks (placebo-controlled phase) and from weeks 12 to 64, allpatients received apremilast 30 mg twice daily (active treatment phase). Patients ranged in age from19 to 72 years, with a mean age of 40 years. The mean duration of BD was 6.84 years. All patients hada history of recurrent oral ulcers with at least 2 oral ulcers at screening and randomisation: the meanbaseline oral ulcer counts were 4.2 and 3.9 in the apremilast and placebo groups, respectively.
The primary endpoint was the Area Under the Curve (AUC) for the number of oral ulcers frombaseline through week 12. Secondary endpoints included other measures of oral ulcers: oral ulcer pain
Visual Analog Scale (VAS), proportion of patients who are oral ulcer-free (complete response), timeto onset of oral ulcer resolution, and proportion of patients achieving resolution of oral ulcers by week6, and who remain oral ulcer free at every visit for at least 6 additional weeks during the 12-weekplacebo-controlled treatment phase. Other endpoints included Behçet’s Syndrome Activity Score(BSAS), BD Current Activity Form (BDCAF), including the BD Current Activity Index (BDCAI)score, the Patient’s Perception of Disease Activity, the Clinician’s Overall Perception of Disease
Activity and the BD Quality of Life Questionnaire (BD QoL).
Measure of oral ulcers
Apremilast 30 mg twice daily resulted in significant improvement in oral ulcers as demonstrated bythe AUC for the number of oral ulcers from baseline through week 12 (p < 0.0001), compared withplacebo.
Significant improvements in other measures of oral ulcers were demonstrated at week 12.
Table 8. Clinical response of oral ulcers at week 12 in RELIEF (ITT population)
Apremilast
Placebo30 mg BID
Endpointa N = 103
N = 104
AUCb for the number of oral ulcers from baseline through week 12 LS Mean LS Mean(MI) 222.14 129.54
Change from baseline in the pain of oral ulcers as measured by LS Mean LS Mean
VASc at week 12 (MMRM) -18.7 -42.7
Proportion of subjects achieving resolution of oral ulcers (oralulcer-free) by week 6, and who remain oral ulcer free at every visit4.9% 29.8%for at least 6 additional weeks during the 12-week placebo-controlled treatment phase
Median time (weeks) to oral ulcer resolution during the placebo-8.1 weeks 2.1 weekscontrolled treatment phase
Proportion of subjects with complete oral ulcer response at week 1222.3% 52.9%(NRI)
Proportion of subjects with partial oral ulcer responsed at week 1247.6% 76.0%(NRI)
ITT=intent to treat; LS=least squares; MI=multiple imputation; MMRM=mixed-effects model for repeatedmeasures; NRI=non-responder imputation; BID=twice daily.a p-value < 0.0001 for all apremilast vs. placebob AUC = Area Under the Curve.c VAS = Visual Analog Scale; 0 = no pain, 100 = worst possible pain.d Partial oral ulcer response = number of oral ulcers reduced by ≥ 50% post baseline (Exploratory analysis);nominal p-value - < 0.0001
Among 104 patients originally randomised to apremilast 30 mg twice daily, 75 patients(approximately 72%) remained on this treatment at week 64. A significant reduction in the meannumber of oral ulcers and oral ulcer pain was observed in the apremilast 30 mg twice daily treatmentgroup compared to the placebo treatment group at every visit, as early as week 1, through week 12 fornumber of oral ulcers (p ≤ 0.0015) and for oral ulcer pain (p ≤ 0.0035). Among patients who werecontinuously treated with apremilast and remained in the study, improvements in oral ulcers andreduction of oral ulcer pain were maintained through week 64 (figures 3 and 4).
Among patients originally randomised to apremilast 30 mg twice daily who remained in the study, theproportions of patients with a complete response and partial response of oral ulcers were maintainedthrough week 64 (53.3% and 76.0% respectively).
Figure 3. Mean number of oral ulcers by time point through week 64 (ITT population; DAO)
ITT = Intent To Treat; DAO = Data As Observed.
APR 30 BID = apremilast 30 mg twice daily.
Note: Placebo or APR 30 mg BID indicates the treatment group in which patients were randomised. Placebo treatment group patientsswitched to APR 30 BID at week 12.
The follow-up time point was 4 weeks after patients completed week 64 or 4 weeks after patients discontinued treatment before week 64.
Figure 4. Mean change from baseline in oral ulcer pain on a visual analog scale by time pointthrough week 64 (ITT Population; DAO)
APR 30 BID = apremilast twice daily; ITT = Intent-To-Treat; DAO = Data As Observed
Note: Placebo or APR 30 mg BID indicates the treatment group in which patients were randomised. Placebo treatment group patientsswitched to APR 30 BID at week 12.
The follow-up time point was 4 weeks after patients completed week 64 or 4 weeks after patients discontinued treatment before week 64.
Improvements in overall Behçet’s disease activity
Apremilast 30 mg twice daily, compared with placebo, resulted in significant reduction in overalldisease activity, as demonstrated by the mean change from baseline at week 12 in the BSAS(p < 0.0001) and the BDCAF (BDCAI, Patient’s Perception of Disease Activity, and the Clinician’s
Overall Perception of Disease Activity; p-values ≤ 0.0335 for all three components).
Among patients originally randomised to apremilast 30 mg twice daily who remained in the study,improvements (mean change from baseline) in both the BSAS and the BDCAF were maintained atweek 64.
Improvements in quality of life
Apremilast 30 mg twice daily, compared with placebo, resulted in significantly greater improvementin Quality of Life (QoL) at week 12, as demonstrated by the BD QoL Questionnaire (p = 0.0003).
Among patients originally randomised to apremilast 30 mg twice daily who remained in the study,improvement in BD QoL was maintained at week 64.
Paediatric patientsThe European Medicines Agency has deferred the obligation to submit results of studies withapremilast in one or more subsets of the paediatric population with Behçet’s disease and psoriaticarthritis (see section 4.2 for information on paediatric use).