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Vol. 39. Núm. 2.
Páginas 80-91 (marzo - abril 2015)
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Vol. 39. Núm. 2.
Páginas 80-91 (marzo - abril 2015)
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Indirect comparison for Anti-TNF drugs in moderate to severe ulcerative colitis
Fármacos anti-TNF en colitis ulcerosa moderada-grave: comparación indirecta
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M. Galván-Banqueri1,
Autor para correspondencia
mercedesgalvanbanqueri@gmail.com

Autor para correspondencia.
, M.D. Vega-Coca1, M.A. Castillo-Muñoz1, C. Beltrán Calvo1, T. Molina López1
1 Andalusian Agency for Health Technology Assessment. Seville. Spain.
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Tabla 1. Search strategy.
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Tabla 2. Quality of the included studies assessed by Critical Appraisal Skills Programme (CASP)
Tablas
Tabla 3. Summary of kev features of clinical trials of bioloaical aaents selected for indirect comparisons
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Tabla 4. Efficacy results in the induction period (week 8 for infliximab y adalimumab; week 6 for golimumab).
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Tabla 5. Efficacy results in the maintenance period (week 54 for infliximab and golimumab; week 52 for adalimumab).
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Tabla 6. Results of the adjusted indirect comparisons
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Abstract
Objective

To compare the relative efficacy of infliximab, adalimumab and golimumab through adjusted indirect treatment comparisons (ITCs).

Methods

An exhaustive search was performed until October 2013. Databases consulted were MEDLINE, EMBASE, the Cochrane Library, the Centre for Reviews and Dissemination and the Web of Science. Randomized control trials (RCTs) comparing the efficacy of infliximab, adalimumab or golimumab versus placebo, in terms of clinical remission, clinical response and mucosal healing, were included. In the case that more than one RCT fulfilled the inclusion criteria for the same drug, a metanalysis was undertaken using a fixed effects model. ITCs were carried out using the method proposed by Bucher et al.

Results

6 RCTs published in 5 papers were included: 2 for infliximab (ACT 1 and ACT 2), 2 for adalimumab (ULTRA 1 y ULTRA 2) and 2 for golimumab (PURSUIT-SC y PURSUIT-M).In these RTCs, each biological agent was superior in efficacy to placebo. The results of the adjusted ITC are the following. In relation to the clinical remission, in the induction and maintenance period, there are no statistically significant differences between the three anti-TNF drugs. In relation to the clinical response and mucosal healing, in the induction period, there are statistically significant differences between infliximab and adalimumab.

Conclusion

In view of the results obtained, infliximab, adalimumab and golimumab appear to be similarly effective therapeutic alternatives. Therefore, other considerations such as safety, tolerance and cost-effectiveness should be taken into account in order to select the most appropriate treatment.

KEYWORDS:
Anti-TNF
Ulcerative colitis
Infliximab
Adalimumab
Golimumab
Indirect treatment comparisons
Resumen
Objetivo

Comparar la eficacia relativa de infliximab, adalimumab y golimumab mediante comparaciones indirectas (CI) ajustadas.

Métodos

Se realizó una búsqueda bibliográfica que abarcó hasta Octubre 2013. Las bases de datos consultadas fueron: MEDLINE, EMBASE, the Cochrane Library, the Centre for Reviews and Dissemination y the Web of Science. Se incluyeron ensayos clínicos aleatorizados (ECA) que compararan la eficacia de infliximab, adalimumab o golimumab frente a placebo en términos de remisión clínica, respuesta clínica y curación de la mucosa. En el caso de que se incluyera más de un ECA para un mismo fármaco se llevó a cabo un metanálisis utilizado el modelo de efectos fijos. Las CI se realizaron utilizando el método de Butcher et al.

Resultados

Se incluyeron 6 ECA publicados en 5 artículos: 2 para infliximab (ACT 1 y ACT 2), 2 para adalimumab (ULTRA 1 y ULTRA 2) y 2 para golimumab (PURSUIT-SC y PURSUIT-M). Los tres agentes biológicos presentaron mayor eficacia que placebo. Los resultados de las CI fueron los siguientes: en relación a la remisión clínica, en el período de inducción y en el período de mantenimiento, no hubo diferencias estadísticamente significativas entre los tres fármacos anti-TNF. En relación a la respuesta clínica y a la curación de la mucosa, en el período de inducción hay diferencias estadísticamente significativas entre infliximab y adalimumab.

Conclusiones

En base a los resultados obtenidos (eficacia similar), infliximab, adalimumab y golimumab parecen ser alternativas terapéuticas. Así, otras consideraciones como la seguridad, la tolerancia y el coste-efectividad deben considerarse a la hora de seleccionar el tratamiento más adecuado.

PALABRAS CLAVE:
Anti-TNF
Colitis ulcerosa
Infliximab
Adalimumab
Golimumab
Comparaciones indirectas
Texto completo
Introduction

Ulcerative colitis (UC) is a chronic inflammatory bowel disease of multifactorial aetiology that mainly affects the colon. It has a relapsing-remitting pattern. It could be classified in function of its extension in ulcerative proctitis, left sided colitis or extensive colitis; and in function of its severity in colitis in remission, mild, moderate or severe colitis1.

Symptoms of active disease or relapse include bloody diarrhoea, an urgent need to defecate and abdominal pain2.

The incidence in Europe is estimated at 1.5 to 20.3 cases per 100,000 person-years3. Disease onset can occur at any age, with a peak incidence between 15 and 25 years and a second smaller between 55 and 65 years2.

Current medical approaches focus on treating active disease to address symptoms, to improve quality of life, and thereafter to maintain remission. The treatment chosen for active disease is likely to depend on clinical severity, extent of disease and the patient’s preference, and may include the use of aminosalicylates, corticosteroids or biological drugs. Surgery may be considered as emergency treatment for severe ulcerative colitis that does not respond to drug treat-ment2,4.

Currently, three anti-TNF (tumour necrosis factor) drugs have been authorized by the European Medicines Agency (EMA) with the following indication: treatment of moderately to severely active ulcerative colitis in adult patients who have had an inadequate response to conventional therapy including corticosteroids and 6-mercaptopurine or azathioprine, or who are intolerant to or have medical contraindications for such therapies5,6,7.

To ensure the rational use of these drugs in clinical practice, aspects such as the efficacy, safety and cost-effectiveness of each drug must be evaluated. No direct head-to-head clinical trials have evaluated the superiority or non-inferiority of these drugs. Given the lack of head-to-head trials comparing biologic agents, indirect treatment comparisons (ITCs) were carried out to explore the relative efficacy of these drugs.

ITCs are relatively new approaches to evaluate the relative treatment effect when two or more interventions have not been compared directly.

An adjusted indirect comparison is an indirect comparison of different treatments adjusted according to the results of their direct comparison with a common control, so that the strength of the randomised trials is preserved. Empirical evidence indicates that results of adjusted indirect comparison are usually, but not always, consistent with the results of direct comparison. Basic assumptions underlying indirect comparisons include a homogeneity assumption for standard meta-analysis, and similarity assumption for adjusted indirect comparison8.

These approaches are being increasingly used by health technology assessmentl (HTA) agencies9 as new and existing drugs must be placed within the context of all available evidence for technology appraisals.

The main objective of this study was to compare the relative efficacy of infliximab, adalimumab and golimumab through adjusted indirect comparisons.

Material and methods

A systematic review was carried out to identify relevant studies published between 2005 (when the first trial about the first anti-TNF drug, infliximab, was published) and October 2013. The electronic search was performed by an information specialist in referential sources. Databases consulted were MEDLINE (through OVID), EMBASE, the Cochrane Library, the databases of the Center for Reviews and Dissemination (CRD) and the Web of Science (WOS). Also, Pubmed was revised in order to detect papers not included in MEDLINE (OVID) yet. The search strategies used in the main databases are shown in table 1.

Tabla 1.

Search strategy.

MEDLINE  EMBASE  WOS 
1. *inflammatory bowel diseases/ or *colitis,  1. ‘ulcerative colitis’/mj OR  1. TI=(colitis AND (ulcerati* 
ulcerative/  ‘enteritis’/de  OR ulcero* OR mucosal) OR 
2. ((colitis and (ulcerati* or ulcero* or mucosal))  2. colitis:ab,ti AND  (procto$colitis OR colorectitis AND 
or ((procto?colitis or colorectitis) and ulcerati*) or  (ulcerati*:ab,ti OR ulcero*:ab,ti  ulcerati*) OR ((chronic NEAR/3 
((chronic adj3 colon) and (ulcerati* or ulcero*))).ti,ab.  OR mucosal:ab,ti) OR  colon) AND (ulcerati* OR ulcero*)) 
3. (chronic and colon and inflammat*).ti,ab.  (procto$colitis:ab,ti OR  OR (chronic AND colon AND 
4. 1 or 2 or 3  colorectitis:ab,ti AND  inflammat*)) OR TS=(colitis AND 
5. *Tumor Necrosis Factor-alpha/ad, ae, ag, ai, ct,  ulcerati*:ab,ti) OR ((chronic  (ulcerati* OR ulcero* OR mucosal) 
de, im, tu  NEAR/3 colon):ab,ti  OR (procto$colitis OR colorectitis 
6. exp Antibodies, Monoclonal/ad, ae, ct, de, im, tu  AND (ulcerati*:ab,ti OR  AND ulcerati*) OR ((chronic NEAR/3 
7. Anti-Inflammatory Agents/tu  ulcero*:ab,ti)) OR (chronic:ab,ti  colon) AND (ulcerati* OR ulcero*)) 
8. Gastrointestinal Agents/tu  AND colon:ab,ti AND  OR (chronic AND colon AND 
9. 5 or 6 or 7 or 8  inflammat*:ab,ti)  inflammat*)) 
10. ((anti?bod* adj3 monoclonal) or (anti?bod*  3. #1 OR #2  2. TI=(infliximab OR adalimumab 
adj3 single?done) or (inmunologic adj2 factor?)  4. ‘infliximab’/exp OR  OR golimumab) OR TS=(infliximab 
or (digestant* or ((gastric or gastrointestin*)  ‘adalimumab’/exp OR  OR adalimumab OR golimumab) 
adj2 (agent? or Drug?))) or (inflammation or  ‘golimumab’/exp  3. TI=(((drug$ OR pharmaco*) 
anti?inflammator*) or ((tumo?r adj3 necros*) or  5. infliximab OR adalimumab  NEAR/3 (treatments OR therap*)) 
tnf?alpha or “tnf”)).ti,ab.  OR golimumab  OR (pharmaco* NEAR/3 
11. (((drug? or pharmaco*) adj3 (treatment? or  6. #4 OR #5  management)) OR 
therap*)) or (pharmaco* adj3 management)).ti,ab.  7. #3 AND #6  TS=(((drug$ OR pharmaco*) NEAR/3 
12. ((anti?bod* adj3 monoclonal) or (anti?bod*  8. 7 NOT [medline]/lim  (treatments OR therap*)) OR 
adj3 single?done) or (inmunologic adj2 factor?) or  9. #8 AND (‘conference  (pharmaco* NEAR/3 management)) 
((tumo?r adj3 necros*) or tnf?alpha or “tnf”)).ti,ab.  abstract’/it OR ‘conference  4. ((#3 AND #2 AND #1)) 
13. (((advers* or drug) adj2 effect?) or immunolog*  paper’/it OR ‘conference  5. (#4) AND Language=(English 
or contra?indicat*).ti,ab.  review’/it OR ‘editorial’/it OR  OR Spanish) AND Document 
14. (10 and 11) or (12 and 13)  ‘letter’/it OR ‘note’/it OR ‘short  Types=(Article OR Review) 
15. (infliximab or adalimumab or golimumab).mp.  survey’/it)  6. TI=(clinical trial OR controlled 
16. 9 or 14 or 15  10. #8 NOT #9  clinical trial OR randomized 
17. 4 and 16  11. #10 AND ([english]/lim OR  controlled trial OR randomization 
18. (letter or “case report*” or “historical article*”  [spanish]/lim)  OR single blind procedure OR 
or (comment or editorial or in vitro or news)).pt.  12. #11 AND ‘human’/de  double blind procedure OR 
19. (“reference list” or bibliography* or “hand  AND (2005:py OR 2006:py  crossover procedure OR placebo 
search*” or “relevant journal*” or (manual  OR 2007:py OR 2008:py  OR random* OR placebo OR 
adj1 search*) or “selection criteria” or “study  OR 2009:py OR 2010:py  blind* OR trial) OR TS=(clinical 
selection*”).mp.  OR 2011:py OR 2012:py OR  trial OR controlled clinical trial 
20. 18 or 19  2013:py) AND (‘clinical trial’/  OR randomized controlled trial 
21. humans/ or (animals/ and humans/)  de OR ‘clinical trial (topic) ’/  OR randomization OR single 
22. 17 and 21  de OR ‘controlled clinical trial’/  blind procedure OR double blind 
23. limit 22 to (clinical trial, phase iii or clinical trial,  de OR ‘controlled clinical  procedure OR crossover procedure 
phase iv or clinical trial or randomized controlled  trial (topic)’/de OR ‘phase 3  OR placebo OR random* OR 
trial)  clinical trial (topic)’/de OR  placebo OR blind* OR trial) 
24. 23 not 20  ‘randomized controlled trial’/de  7. #6 AND #5 
25. limit 24 to (english or spanish)  OR ‘randomized controlled trial  8. #7 Databases=SCI-EXPANDED 
26. limit 25 to yr=“2005 -Current”  (topic) ’/de)  Timespan=2011-2013 

Grey literature was obtained by searching the web sites of the EMA and HTA agencies. Unpublished data were not included in this review.

Studies were chosen for inclusion in the review based on the criteria outlined below:

  • Population: adult patients naïve to biological drugs with moderate to severe ulcerative colitis.

  • Intervention: infliximab, adalimumab or golimumab.

  • Comparator: other anti-TNF-drug (direct comparison between the aforementioned interventions), or placebo.

  • Outcomes: clinical remission, clinical response and mucosal healing.

  • Study design: randomized controlled trials (RCTs).

Selection, critical appraisal, data extraction, qualitative and quantitative synthesis of the evaluated studies were independently undertaken by two researchers. Any discrepancies between the reviewers were resolved by a third independent reviewer.

The quality of the evidence of the included studies was assessed by the section A of the Critical Appraisal Skills Programme (CASP)10.

Heterogeneity of included studies was assessed with respect to the trial design and patient populations. For drugs with more than one study, a traditional meta-analysis of the efficacy data was performed, using a fixed-effect model, in the absence of heterogeneity, and the inverse variance method. Analyses were conducted using Epidat version 4.011.

Both clinical similarity and methodological similarity should be considered in adjusted indirect comparison. If the trial similarity assumption is not fulfilled, estimates from adjusted indirect comparisons will be invalid and misleading or should be interpreted cautiously.

Finally, adjusted ITCs were conducted based on the relative effects of each biological drug against a common comparator (placebo), following the method proposed by Butcher et al12. For the calculation of the risk ratio (RR) (95% CI), the software CIT, developed by the Canadian Agency for Drugs and Technologies in Health (CADTH), was used13.

Results

A total of 288 citations were found. 6 RCTs published in 5 papers were included: 2 for infliximab (ACT 1 and ACT 2)4, 2 for adalimumab (ULTRA 1 y ULTRA 2)14,15 and 2 for golimumab (PURSUIT-SC y PURSUIT-M)16,17. The flow diagram illustrates the way in which the trials were selected (Fig. 1).

Figure 1.

Literature flowchart for inclusion and exclusion of studies.

(0.12MB).

The quality of the included studies, based on CASP checklist, is detailed in table 2. All of them were of high quality (score 6 out of 6).

Tabla 2.

Quality of the included studies assessed by Critical Appraisal Skills Programme (CASP)

CASP Randomised Controlled Trial
  Rutgeerts et al 2005 (ACT 1)4  Rutgeertset al 2005 (ACT 2)4  Reinisch etal 2011(ULTRA 1)13  Sandbornet al 2012 (ULTRA 2)14  Sandbornet al 2014aPURSUIT-SC)15  Sandborn etal 2014b (PURSUIT-M)16 
SCREENING QUESTIONS
1.- Did the trial address a clearly focused issue?  Yes  Yes  Yes  Yes  Yes  Yes 
2.- Was the assignmentof patients to treatments randomised?  Yes  Yes  Yes  Yes  Yes  Yes 
3.- Were all of the patients who entered the trial properly accounted for at its conclusion?  Yes  Yes  Yes  Yes  Yes  Yes 
DETAILED QUESTIONS
4.- Were patients, health workers and study personnel ‘blind’ to treatment?  Yes  Yes  Yes  Yes  Yes  Yes 
5.- Were the groups similar at the start of the trial?  Yes  Yes  Yes  Yes  Yes  Yes 
6.- Aside from the experimental intervention, were the groups treated equally?  Yes  Yes  Yes  Yes  Yes  Yes 
CASPe score 

Rutgeerts et al reported the results of 2 randomized, double-blind, placebo-controlled trials (ACT 1 and ACT 2) which evaluated the efficacy of infliximab for induction and maintenance therapy in adults with ulcerative colitis5. 364 patients were included in each trial. Patients were followed for 54 weeks and 30 weeks in ACT 1 and ACT 2 studies, respectively. The primary endpoint was clinical response at week 8 in both cases.

For adalimumab, 2 randomized, double-blind and placebo controlled trials were included, ULTRA 1 and ULTRA 214,15. The ULTRA 1 study evaluated the efficacy of two dosing regimens of adalimumab in the induction period. A total of 390 patients were included and the primary endpoint was clinical remission at week 8. Moreover, in the ULTRA 2 study, the efficacy of adalimumab in the maintenance period was evaluated. A total of 494 patients were included. However, the subset of patients naïve to biological drugs (the study population in this review) was 295, as patients previously treated with biological agents could be included in the study. The primary end point was clinical remission at weeks 8 and 52.

PURSUIT-SC and PURSUIT-M trials assessed the efficacy of golimumab in the induction and maintenance period, respectively16,17. PURSUIT-SC integrated data from phase II and III trials. For phase III, a total of 771 patients, followed for 6 weeks, were included. The primary endpoint was clinical response at week 6. PURSUIT-M included 464 patients and the primary endpoint was clinical sustained response through week 54.

Patients baseline characteristics are showed in table 3. In order to asses the relative efficacy of the biologic drugs in the induction and maintenance periods, relevant and common clinical endpoint in the studies for the three drugs were selected: clinical remission, clinical response and mucosal healing, measured in the 6-8 (induction) and 52-54 (maintenance) weeks.

Tabla 3.

Summary of kev features of clinical trials of bioloaical aaents selected for indirect comparisons

      Patients Baseline Characteristics       
Study  Inclusion Criteria  Age (mean)  Duration Of Disease (mean)  Mayo Score (mean)  ColonicArea Involved(%)  C Reactive Protein (mean)  Concomitant Medication (%)  Treatment Group  Placebo Group  Primary End Point  Secondary End Points 
INFLIXIMAB
Rutgeerts et  364  Active ulcerative  41.8  6.8  8.4  Left side  1.6  Corticosteroids (61%)  Infliximab at a  Placebo at  Clinical  - Clinical 
al 2005    colitis with a        (54%)    5-Aminosalicylates  dose of 5 mg  weeks 0, 2,  response  response (at 
(ACT 1)4    Mayo score of 6        Extensive    (69.5%)  or 10 mg per  and 6 and  (at week 8).  week 8 at 30 in 
Phase III    to 12 points and        (45,6%)    Immunosuppressants  kilogram of  then every    both and at 54 
(54 weeks)    moderate-to-severe            (48.9%)  body weight  eight weeks    in ACT 1). 
    active disease on              at weeks 0,  through    - Clinical 
Rutgeerts et  364  sigmoidoscopy  40  6.6  8.4  Left side  1.4  Corticosteroids (51.1%)  2, and 6 and  week    remission (at 
al 2005    (Mayo endoscopic        (60%)    5-Aminosalicylates  then every  22 in ACT 2    week 8 at 30 in 
(ACT 2)4    subscore of at        Extensive  (74.7%)  eight weeks  or week 46      both and at 54 
Phase III    least 2) despite        (40%)  Immunosuppressants  through week  in ACT 1.      in ACT 1). 
(30 weeks)    concurrent          (42.9%)  22 in ACT 2      - Mucosal   
    treatment with            or week 46 in      healing (at   
    corticosteroids            ACT 1.      week 8 at 30 in   
    alone or in                  both and at 54   
    combination with            ACT 1, η      in ACT 1).   
    azathioprine or            infliximab 5         
    mercaptopurine            mg/kg=121;  ACT 1,       
    in ACT 1 or            η infliximab  n=121       
    despite concurrent            10 mg/         
    treatment with            kg=122         
    corticosteroids                     
    alone or in            ACT 2, η         
    combination with            infliximab 5         
    azathioprine or            mg/kg=121;  ACT 2,       
    mercaptopurine            η infliximab  n=123       
    and medications            10 mg/         
    containing            kg=120         
    5-aminosalicylates                     
    in ACT 2.                     
ADALIMUMAB                         
Reinisch  390 Adult ambulatory  37.8 6.1  8.8 Left side  4.3 Corticosteroid  -Adalimumab Placebo at  Clinical  - Clinical           
etal 2011  patients with    (38.7%)  (without IMM)  160mgat weeks  remission  response           
(ULTRA 1)13  moderately to    Extensive  (38.4%)  week 0,2,4 and  (at week 8).  (at week 8).           
Phase III  severely active    (52%)  IMM (without  0, 80 mg at 6.    - Mucosal           
(8 weeks)  ulcerative    Other  corticosteroid)  week 2, n=130    healing           
  colitis, defined    (9.2%)  (18.2%)  40 mg at    (at week 8).           
  by a full Mayo      Corticosteroid +IMM  weeks 4 and 6.               
  score (including      (21.3%)  - Adalimumab               
  endoscopic      Aminosalicylates  80 mg at week               
  assessment) of 6-12      (77.5%)  0, 40 mg at               
  with an endoscopy        weeks 2,4               
  subscore of 2-3,        and 6.               
  despite concurrent        n=130 in both               
  and stable        dosages               
  treatment with oral                       
  corticosteroids                       
  and/or                       
  immunomodulators.                       
Sandborn  494 Adults with  40.4 8.3  8.9 Pancolitis  13.8 Corticosteroids  Adalimumab Placebo EOW Clinical  - Clinical             
etal 2012  (295 moderately-to-    (48.6%)  (58.7%)  160mgat beginning at  remission  response           
(ULTRA 2)14  nal‘ve to severely active    Descending  Azathioprine/6-MP  week 0, 80 week 0.  (at weeks 8  (at weeks 8           
Phase III  biological UC for at least 3    colon  (35%)  mg at week n= 145  and 52).  and 52).           
(52 weeks)  drugs) months with a    (38.9%)  Aminosalicylates  2 and then    - Mucosal           
  Mayo score of 6-12    Other  (60.9%)  40 mg EOW    healing           
  points (endoscopy    (12.6%)  Azathioprine/6-MP  beginning at    (at weeks 8           
  subscore of at      and/or steroids  week 4.    and 52).           
  least 2), despite      (74.5%)  n= 150               
  concurrent therapy      Azathioprine/6-MP                 
  with steroids and/      +steroids (19.2%)                 
  or azathioprine or      Prior anti-TNF therapy                 
  6-mercaptopurine.      (40.3%)                 
GOLIMUMAB                         
Sandborn  168  Patients had 40 6.3  8.5 Leftside  11.5 Corticosteroids  Phase III:  Placebo  Clinical  - Clinical         
et al 2014a  (Phase Ii;  ι an inadequate  (57,8%)  (excluding budesonide)  Golimumab:  at weeks 0  response  remission         
(PURSUIT-  771  response to, or had  Extensive  (42.8%)  - 200 mg at  and 2.  (at week 6).  (at week 6).         
SC)15  (Phase III  ) failed to tolerate,  (42,2%)  Budesonide (2.3%)  week 0 and  n=256    - Mucosal         
Phase ll-lll    1 or more of the    Immunomodulatory  100 mg at      healing (at         
(6 weeks)    following    drugs (32.4%)  week 2.      week 6).         
    conventional    6-MP/azathioprine  - 400 mg at               
    therapies: oral    (31.2%)  week 0 and               
    mesalamine, oral    Methotrexate (1.2%)  200 mg at               
    corticosteroids,    Mesalamine (81.9%)  week 2.               
    azathioprine,      n= 257               
    and/or      and 258               
    6-mercaptopurine;      respectively.               
    or were                     
    corticosteroid                     
    dependent.                     
Sandborn  464  Participants in 40.2 7  8.3 —  9 Corticosteroid (5.,5%)  Golimumab:  Placebo  Maintenance  - Clinical         
et al 2014b    PURSUIT-M had    Budesonide (3.2%)  - 50 mg every every  of clinical  remission           
(PURSUIT-    completed one of    Immunomodulatory  4 weeks  4 weeks  response  (at weeks 30         
    two golimumab    drugs (31.7%)  through week through  through  and 54).           
Phase III    induction studies,    Aminosalicylates  52.  week 52.  week 54.  - Mucosal         
(52 weeks)    PURSUITIV    (80.2%)  -100 mg  n=156    healing         
    or PURSUIT-SC.      every 4 weeks      (at weeks 30         
          through week      and 54).         
            52.             
          n= 154 for               
          both dosages.               

Clinical response was defined as a decrease from baseline in the total Mayo score of at least 3 points and at least 30 percent, with an accompanying decrease in the subscore for rectal bleeding of at least 1 point or an absolute subscore for rectal bleeding of 0 or 1.

Clinical remission was defined as a total Mayo score of 2 points or lower, with no individual subscore exceeding 1 point. Mucosal healing was defined as an absolute subscore for endoscopy of 0 or 1.

The efficacy results for the endpoints clinical remission, clinical response and mucosal healing of each clinical trial included are listed in tables 4 and 5, for the induction and maintenance periods, respectively.

Tabla 4.

Efficacy results in the induction period (week 8 for infliximab y adalimumab; week 6 for golimumab).

  Clinical remissionClinical responseMucosal healing
  Treatment  Placebo  RR (95% CI)  Treatment  Placebo  RR (95% CI)  Treatment  Placebo  RR (95% CI) 
INFLIXIMAB (5 mg/kg weeks 0, 2 y 6)
Rutgeerts et al 2005 (ACT 1)4  47/121  18/121  2.61 (1.61-4.23)  84/121  45/121  1.87 (1.44-2.42)  75/121  41/121  1.83 (1.38-2.43) 
Rutgeerts et al 2005 (ACT 2)4  41/121  7/123  5.95 (2.78-12.75)  78/121  36/123  2.2 (1.62-2.99)  73/121  38/123  1.95 (1.44-2.64) 
Metanalysls  —  —  3.3 (2.19-4.96)  —  —  2(1.64-2.44)  —  —  1.88 (1.53-2.32) 
ADALIMUMAB (160 mg at week 1,80 mg at week 2 and 40 mg at week 4 y 6)
Relnlsch et al 2011 (ULTRA 1)13  24/130  12/130  2(1.05-3.83)  71/130  58/130  1.22 (0.96-1,57)  61/130  54/130  1.13 (0.86-1.49) 
Sandborn et al 2012 (ULTRA 2)14  32/150  16/145  1.93 (1,11-3,37)  89/1 50  56/145  1.54 (1.ΣΟΙ.96)  74/1 50  51/145  1.4 (1.07-1.84) 
Metanalysls  —  —  1.96 (1.29-2.99)  —  —  1.37 (1.15-1,63)  —  —  1.26 (1.04-1,53) 
GOLIMUMAB (200 mg at week 0 and 100 mg at week 2)
Sandborn et al 2013 (PURSUIT-SC)15  48/257  16/256  2.99 (1.74-5.12)  133/257  76/256  1.74 (1.40-2.18)  111/257  73/256  1.51 (1.19-1.92) 
Tabla 5.

Efficacy results in the maintenance period (week 54 for infliximab and golimumab; week 52 for adalimumab).

  Clinical remissionClinical responseMucosal healing
  Treatment  Placebo  RR (95% CI)  Treatment  Placebo  RR (95% CI)  Treatment  Placebo  RR (95% CI) 
INFLIXIMAB (5 mg/kg every 8 weeks)
Rutgeertset al 2005(ACT 1)4  42/121  20/121  2.1(1.31-3.36)  55/121  24/121  2.29 (1.52-3.45)  55/121  22/121  2.5 (1.63-3.83) 
ADALIMUMAB (40 mg every 2 weeks)
Sandbornet al 2012(ULTRA 2)14  33/150  18/145  1.77(1.05-3)  55/150  35/145  1.52(1.06-2.17)  47/150  28/145  1.62 (1.08-2.44) 
GOLIMUMAB (50 mg every 4 weeks)
Sandbornet al 2013(PURSUIT-M)16  50/151  34/154  1,50(1.03-2.18)  —  —  —  —  —  — 
GOLIMUMAB (100 mg every 4 weeks)
Sandbornet al 2013(PURSUIT-M)16  51/151  34/154  1,53(1.06-2.22)  —  —  —  —  —  — 

The results of the adjusted ITCs (table 6) for the selected outcomes (clinical remission, clinical response and mucosal healing) revealed that:

Tabla 6.

Results of the adjusted indirect comparisons

  Induction period  Maintenance period 
Clinical remissionRR (95% CI)  Infliximab vs adalimumab: 1.68 (0.94-3.03) Infliximab vs golimumab: 1.10 (0.56-2.17) Adalimumab vs golimumab: 0.66 (0.33-1.30)  Infliximab vs adalimumab:1.19 (0.59-2.40)Infliximab vs golimumab 50 mg:1.40 (0.77-2.56)Infliximab vs golimumab 100 mg:1.37 (0.75-2.50)Adalimumab vs golimumab 50 mg: 1.18 (0.62-2.25)Adalimumab vs golimumab 100 mg: 1.16 (0.61-2.20) 
Clinical responseRR (95% CI)  Infliximab vs adalimumab: 1.46 (1.12-1.90)Infliximab vs golimumab: 1.15 (0.85-1.55) Adalimumab vs golimumab: 0.79 (0.59-1.04)  Infliximab vs adalimumab:1.51 (0.87-2.60) 
Mucosal healingRR (95% CI)  Infliximab vs adalimumab: 1.49 (1.12-1.98)Infliximab vs golimumab: 1.25 (0.91-1.71) Adalimumab vs golimumab: 0.83 (0.61-1.14)  Infliximab vs adalimumab:1.54 (0.86-2.79) 

In the induction period, there were no statistically significant differences between the 3 drugs in terms of clinical remission. In relation to the efficacy endpoints clinical response and mucosal healing, statistically significant differences were observed between infliximab and adalimumab.

In the maintenance period, there were no statistically significant differences between the 3 drugs in terms of clinical remission, clinical response and mucosal healing.

Discussion

In the six RCTs included, patients had similar baseline characteristics and the efficacy outcomes used were the same, although the primary endpoint was not the same in all trials. In addition, the six trials evaluated the results at weeks 6-8 and 52-54 for induction and maintenance periods, respectively. Based on the homogeneity and similarity of the trials, it was possible to realize indirect comparisons between the three biological agents.

The internal validity of the analyses is contingent on three factors: 1) the appropriate identification of the studies that make up the evidence network, 2) the quality of the individual RCTs, and 3) the extent of confounding bias due to similarity violations. Appropriate search and selection methods of all relevant RCTs was conducted. The internal validity of the single RCTs included was high. Studies did not differ with respect to the characteristics of the patients, the way in which the outcomes were measured or defined, the protocol requirements including the concomitant interventions allowed, the length of follow-up as well as differential loss to follow-up.

There are several limitations to consider in these analyses. The study ULTRA 2 included patients who could have been previously treated with anti-TNF drugs. However, the patients were stratified according to prior exposure to the same or not, and the results were reported independently for each subgroup of patients. Moreover, in this study, patients not responding to adali-mumab treatment could continue with it, but they entered to an open trial, assuming these losses as treatment failure (this does not happen with trials of infliximab and golimumab). Finally, the Mayo score was calculated in ULTRA 2 as the worst score of the last three days for stool frequency and rectal bleeding, while in RCTs of in-fliximab and golimumab was calculated as the average score of the last three days for these items.

The statistical approach that we employed is widely accepted by agencies such as the National Institute for Health and Care Excellence (NICE), and the CAD-TH. However, many clinicians may be unfamiliar with this approach and few guides are available to critically appraise such studies. The ITCs rely on many of the same assumptions as a standard pair-wise meta-analysis. There is a necessary consideration that the trials of each agent are sufficiently similar to pool together in terms of populations, interventions and outcomes. A further necessary consideration is that these similarities exist across the different agents.

For both infliximab and golimumab, the results of ACT 1 and ACT 2 and PURSUIT-SC and PURSUIT- M, were consistent with each other respectively. However, in the case of adalimumab, in ULTRA 1 and ULTRA 2, the results for the primary endpoint (clinical remission at week 8) were similar, but these studies differed in the results of the secondary endpoints. In ULTRA 1, there were no statistically significant differences between adalimumab and placebo for clinical response and mucosal healing at week 8, while in ULTRA 2 there were. This discrepancy may be due to higher response rates in the placebo group in ULTRA 1.

The three biological agents showed statistically superior efficacy to placebo. The available evidence is limited, as there are no comparative head to head trials.

The results of the adjusted ITCs for the outcomes evaluated were heterogeneous and insufficient to suggest differences between the three drugs. Therefore, they can be considered therapeutic alternatives with similar efficacy.

The results of the RCTs can be extrapolated to the population of interest, because the baseline characteristics of the patients do not have substantially differences with the patients treated in the routine clinical practice. Moreover, the end points used in the studies are the recommended for this condition.

Given the lack of ITCs related to biological agents in Spain, this work could be an important contribution for the evidence available so far. Nevertheless, a network meta-analysis18, which includes vedolizumab (a biological agent recently approved by EMA), had been published after we finished our systematic review. This new meta-analysis concludes that biological agents are effective treatments for UC. However head-to-head trials are necessary to select the best treatment option.

There is no evidence to suggest the superiority of one drug over the other. In view of the results obtained, inflixi-mab, adalimumab and golimumab appear to be similarly effective therapeutic alternatives. Therefore, other considerations such as safety, tolerance and cost-effectiveness should be taken into account in order to select the most appropriate treatment for individuals with ulcerative colitis.

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