Lessons learnt from a discontinued randomised controlled trial: adalimumab injection compared with placebo for patients receiving physiotherapy treatment for sciatica (Subcutaneous Injection of Adalimumab Trial compared with Control: SCIATiC)
Trials volume 19, Article number: 408 (2018)
Adalimumab, a biological treatment targeting tumour necrosis factor α, might be useful in sciatica. This paper describes the challenges faced when developing a new treatment pathway for a randomised controlled trial of adalimumab for people with sciatica, as well as the reasons why the trial discussed was stopped early.
A pragmatic, parallel group, randomised controlled trial with blinded (masked) participants, clinicians, outcome assessment and statistical analysis was conducted in six UK sites. Participants were identified and recruited from general practices, musculoskeletal services and outpatient physiotherapy clinics. They were adults with persistent symptoms of sciatica of 1 to 6 months’ duration with moderate to high level of disability. Eligibility was assessed by research physiotherapists according to clinical criteria, and participants were randomised to receive two doses of adalimumab (80 mg then 40 mg 2 weeks later) or saline placebo subcutaneous injections in the posterior lateral thigh. Both groups were referred for a course of physiotherapy. Outcomes were measured at baseline, 6-week, 6-month and 12-month follow-up. The main outcome measure was disability measured using the Oswestry Disability Index. The planned sample size was 332, with the first 50 in an internal pilot phase.
The internal pilot phase was discontinued after 10 months from opening owing to low recruitment (two of the six sites active, eight participants recruited). There were several challenges: contractual delays; one site did not complete contract negotiations, and two sites signed contracts shortly before trial closure; site withdrawal owing to patient safety concerns; difficulties obtaining excess treatment costs; and in the two sites that did recruit, recruitment was slower than planned because of operational issues and low uptake by potential participants.
Improved patient care requires robust clinical research within contexts in which treatments can realistically be provided. Step changes in treatment, such as the introduction of biologic treatments for severe sciatica, raise complex issues that can delay trial initiation and retard recruitment. Additional preparatory work might be required before testing novel treatments. A randomised controlled trial of tumour necrosis factor-α blockade is still needed to determine its cost-effectiveness in severe sciatica.
Current Controlled Trials, ISRCTN14569274. Registered on 15 December 2014.
Sciatica is a well-localised leg pain, attributed to nerve root irritation, that approximates the dermatomal distribution of the sciatic nerve down the posterior lateral aspect of the leg . It is a common cause of pain and disability . Although most cases resolve, up to 30% might have persistent troublesome symptoms after 1 year [3, 4]. Many patients whose symptoms settle relapse later . Typical care pathways in the National Health Service (NHS) involve analgesia prescribed by a general practitioner (GP), referral for physiotherapy [6, 7], followed by more invasive treatment, such as epidural corticosteroid injection or disc surgery if symptoms persist [3, 4, 8]. However, the evidence for most of the non-surgical treatments is weak ; new treatment strategies are needed.
Sciatica caused by lumbar nerve root pain usually arises from a prolapsed intervertebral disc , which can compress the nerve root  but also releases pro-inflammatory factors such as tumour necrosis factor-α (TNF-α) that may lead to nerve sensitisation [11, 12]. Biological agents such as the monoclonal antibody adalimumab bind specifically to TNF-α receptors and might have beneficial effects on the inflamed nerve root in sciatica . Two separate network meta-analyses of different treatment strategies for sciatica found that biological agents had the highest probability of having the best outcomes for pain, but with wide confidence intervals [14, 15]. A meta-analysis of biological agents for sciatica found insufficient evidence to change practice but sufficient evidence to suggest that clinically important benefit was possible and that a definitive randomised controlled trial (RCT) was warranted .
Sciatica is costly to society , and although biological agents are expensive, they may be cost-effective if they reduce the need for more expensive treatments such as disc surgery. Also, as patents expire, cheaper biosimilar drugs are becoming available . Adalimumab is a TNF-α-blocking antibody that is administered by subcutaneous injection, with two doses given 2 weeks apart, and should inhibit TNF-α for at least 4 weeks. Adalimumab dosing for psoriasis or Crohn’s disease uses 80-mg followed by 40-mg subcutaneous injections ; the same dosing strategy is proposed in sciatica.
The aims of the RCT were to evaluate the effectiveness and cost-effectiveness of injections of adalimumab plus physiotherapy compared with placebo injection of 0.9% sodium chloride plus physiotherapy for patients with sciatica for whom first-line primary care treatment had failed. However, the RCT was discontinued because of lack of progress. The aim of this paper is to explore the reasons for this and make recommendations to inform other researchers.
This was designed as a pragmatic, multi-centre RCT with blinded (masked) participants, clinicians, outcome assessment and statistical analysis, with concurrent economic evaluation and internal pilot. The Wales Research Ethics Committee (REC) 3 granted approval on 27 May 2015 (15/WA/105), and clinical trial authorisation from the Medicines and Healthcare products Regulatory Agency (MHRA) was granted on 15 April 2015 (21996/0002/001-0001). The setting was the NHS in England and Wales, with five collaborating university centres (designated 1–5). We aimed to recruit from six NHS sites overseen by these five centres (designated A–F). Each collaborating centre would oversee a number of patient identification centres, which consisted of general medical practices, local musculoskeletal services and outpatient physiotherapy clinics. Patients were identified in three ways:
By their GP
Following a search of the general practice patient record database
After referral to local musculoskeletal services
Patients were invited to participate by letter. Those who were interested were contacted by telephone for pre-screening, and if they fitted the inclusion criteria, were given an appointment in a research clinic run by a research physiotherapist. At this research clinic, all potential participants were screened by the research physiotherapist for eligibility. If eligible, participants had blood tests, tuberculosis (TB) screening, biological agents counselling, and magnetic resonance imaging (MRI) to exclude serious spinal pathology. If they were still eligible, at a second screening assessment 2–3 weeks later, informed consent was obtained for trial entry and randomisation (Fig. 1).
Clinical features of sciatica
○ Leg pain worse than or as bad as back pain
○ Unilateral leg pain approximating a dermatomal distribution
○ Positive neural tension test such as straight leg raise test restricted < 50 degrees by leg pain, or positive femoral stretch test, or muscle weakness, or loss of tendon reflex, or loss of sensation in a dermatomal distribution
18 years of age or older
Persistent symptoms for ≥ 4 weeks and < 6 months
Moderate to high severity (≥ 30) on Oswestry Disability Index (ODI)
Unable to undergo MRI
Neurological deficit requiring urgent spinal surgery assessment
Contralateral leg pain extending below the inferior gluteal margin
Widespread pain throughout the body
Prior use of biological agents within previous 6 months
Previous lumbar spinal surgery
Contraindications to adalimumab injection
Unable to give informed consent
Secure web-based randomisation was performed using a dynamic adaptive randomisation algorithm  to protect against subversion while ensuring that the trial maintained good balance to the allocation ratio of 1:1, both within each stratification variable and across the trial. Participants were stratified by (1) treatment centre and (2) presence of neurological signs (motor weakness or sensory loss).
All participants were randomised to receive an 80-mg adalimumab subcutaneous injection followed 2 weeks later by a 40-mg injection in the posterior thigh, or an equivalent volume of 0.9% sodium chloride. Both groups received a concurrent course of physiotherapy over a period of 12 weeks [21, 22].
Internal pilot trial phase
The internal pilot trial phase aimed to assess the feasibility of the trial procedures, recruitment and retention rates, based on the first 50 participants recruited. The stopping criteria at the end of this internal pilot were recruitment which failed to reach 80% of the planned recruitment rate target, dropouts exceeding 20%, or more than one centre failing to commence recruitment.
The baseline questionnaire was administered by research physiotherapists. We planned to send postal questionnaires at 6 weeks, 6 months and 12 months post-randomisation. The primary clinical outcome was back pain-related disability using the ODI  measured at 12 months, which has evidence of validity for sciatica as well as back pain. The primary economic outcome was quality-adjusted life-year calculated from the EuroQol 5-level EQ-5D version (EQ-5D-5L) .
Oswestry Disability Index 
Sciatica Bothersomeness Index 
Pain location using a pain manikin 
EuroQol EQ-5D-5L 
Global assessment of change since baseline
Hospital Anxiety and Depression Scale 
Use of health care and social care services
Process measures (potential predictors and mediators of outcome)
Keele STarT Back Risk Screening Tool 
Pain trajectory (based on a single question) 
Pain Self-Efficacy Questionnaire 
Tampa Scale for Kinesiophobia 
In order to detect an effect size of 0.4 with 90% power, 5% significance and 80% retention rate, 332 patients would have needed to be recruited.
Written qualitative comments
After the trial funding was withdrawn because of slow progress, the trial management team and all sites were asked to reflect on what worked and what did not work within the trial. Written comments were collated by the trial manager (AJ) and the chief investigator (NHW) and grouped into themes.
Trial progress is compared with what was planned, as shown in Fig. 2. The letter of notification of funding was received on 11th August 2014. The trial documentation for the regulatory approval was in place in December 2014. Regulatory approval was obtained from the MHRA on 15th April 2015 and from the REC on 27th May 2015. There were long delays in signing contracts with University 4 and NHS sites D and E, and contracts were never signed with University 5 and NHS site F (Table 1). There were delays in obtaining the excess treatment costs (ETCs) for some sites in England. University 3 and NHS site C withdrew from the trial in February 2016. The trial initially opened to recruitment on 8th December 2015 at NHS sites A and B, with NHS sites D and E opening to recruitment on 11th August 2016. The trial was closed early on 23rd September 2016 because of poor recruitment.
The main contract was between the funder (NIHR Health Technology Assessment) and University 1, which was one of the centres and also acted as sponsor. Subcontracts between University 1 and the participating centres and sites concerning roles and responsibilities and the available funding were a major issue. Initial subcontract templates were drafted in November 2014 but could not proceed further until the main contract and finances were agreed with the funder in February 2015. Draft subcontracts were sent to the relevant parties from University 1 contracts department on 31st March 2015. The time taken to sign contracts is shown in Table 1.
There were protracted discussions about the nature and content of the subcontracts, as well as the division of responsibilities between the academic partners and the NHS sites. In the final adopted model, the subcontracts were between the NHS sites and the sponsor, with universities providing academic support rather than taking on contractual responsibilities .
There were initial discussions about whether to have a tripartite subcontract between University 1, University 4 and NHS site D, but after further discussion it was agreed that University 1 would have separate subcontracts. In addition, physiotherapy services were provided by two NHS sites, and separate subcontracts were needed for each. Two clinical rheumatology services were being merged during the trial set-up. The Clinical Trials Unit at University 4 had recently had an MHRA inspection in autumn 2015, and the learning from that recent inspection led to further discussions concerning sponsorship arrangements, delegated duties and the wording of the contract to clarify the role of the NHS sites, which resulted in further delay.
There were delays with the agreement between University 1, University 5 and NHS Site F regarding delineation of the roles and responsibilities of the NHS site and University 5, which included the costing model for the MRI. These discussions were still ongoing when the study was stopped.
The funder also requested oversight of all the subcontracts before they were signed. Delays with the subcontracts led to delays with recruitment and retention of staff at the trial sites.
Excess treatment costs
In the United Kingdom, the costs of a pharmacological treatment in an RCT are met by a participating pharmaceutical company or by the participating NHS organisation, and not by the research funder. These ETCs amounted to more than £1000 per participant in the intervention group. In Wales ETCs are managed centrally and were agreed by the Welsh government for the two Welsh sites (A and F), whereas in England individual NHS sites are responsible. An ETC application was submitted to NHS site B in June 2014 and approved on 11th March 2015. In NHS site D an initial application for ETCs was declined owing to insufficient funds. The co-investigators from University 4 led negotiations with both NHS site D and the local Clinical Commissioning Groups (CCGs). Both parties argued that they were not funded to support these ETCs, despite guidance on attributing the costs of health and social care research and development . Following negotiation it was agreed that the costs would be split between the local CCGs and the charitable funds from NHS site D. ETCs were approved for NHS site D on 19th August 2015. Provisional ETCs were agreed for NHS site C, who were told that it would be finalised once research and development approval was given.
Withdrawal of site
Eight months after initiation, NHS site C reviewed the risk assessment of the trial. The locality has a high incidence of TB, and there had recently been several difficult and complex cases treated locally, which had drawn the attention of the local press and community pressure groups [38, 39]. Adalimumab is known to reactivate latent TB , and all patients should be evaluated for TB before commencing treatment. The principal investigator (PI) was worried about the risk of reactivating TB with the initial 80-mg dose of adalimumab and decided to withdraw from the trial. Consequently University 3 also withdrew from the trial. This withdrawal led to a risk review for the other sites, who concluded that available data indicated an acceptable risk of infection in their populations, which was consistent with advice provided in the patient information sheet.
Research physiotherapist recruitment
Delays in signing subcontracts and setting up sites led to delays in recruiting the research physiotherapists at study sites. In NHS site A a physiotherapist was seconded from the NHS physiotherapy department but was required to return to clinical duties because of staffing shortages. This led to delays in recruiting participants into the trial, and to the loss of potential participants. The availability of research nurses and consultant rheumatologists was limited owing to other clinical commitments, so co-ordination of biological agent counselling and investigations was difficult within the time available.
Recruitment data for the trial are presented in Fig. 3, and reasons for withdrawal or exclusion are listed in Table 2. NHS sites A and B recruited from December 2015 to September 2016. NHS sites D and E recruited from August to September 2016.
Recruitment was less than anticipated. Invitation letters were sent to 1546 potential participants across sites A and B; 583 (38%) were interested in participating and underwent pre-screening by telephone. At pre-screening 210 (36%) did not have sciatica according to our criteria, and 173 (30%) had had symptoms for longer than 6 months, making them ineligible for the trial. Twenty five (4.3%) attended for screening at the first clinic assessment, 13 (52%) were eligible after the second clinical assessment, and 8 were randomised. The other five were eligible but could not be randomised, owing to study closure.
In NHS site A, 16 GP practices identified eligible patients presenting to the practice using database searches or opportunistic referral. Musculoskeletal clinics and physiotherapy departments also searched for eligible patients presenting to their clinics.
NHS site B recruited mainly from a secondary care back pain service rather than from primary care and had a higher rate of exclusion because of longer duration of symptoms (19% of those excluded) than in the other sites (NHS site A, 4%; NHS sites D and E, 5%). It was noted by the PI at this site that referrals of patients with sciatica to the clinics had decreased between planning stages and the start of trial recruitment, owing to a change in the referral pathway commissioned by the local CCG. Therefore, the planned recruitment pathway was changed to inviting GP practices to identify eligible patients by database search or opportunistic referral, independent of referral to specialist services. Database searches commenced at 12 practices in June 2016; 756 potential participants were identified by GP practices, 11 were invited to first clinical assessment screening, and 5 provided initial consent to participate before the trial was terminated.
NHS sites D and E had opened to recruitment on 11th August 2016, but the trial was closed on 26th September 2016. During this period there was a reasonable response rate of 14 of 43 invitations to participate, and nearly half of these, 6 of 14, were made by GPs handing out trial information packs during primary care consultations. This method of recruitment could have been more successful, but we were unable to test this properly before the trial closed. One patient who was eligible after assessment by the research physiotherapist was not able to participate because of trial closure.
No adverse events or adverse reactions were recorded for any of the eight participants.
Summary of lessons learnt
This study has several important findings with major implications for developing evidence, within a UK setting, for challenging, expensive interventions with the potential for rare but significant side effects. We found that treatment pathways for acute sciatica varied across research sites and changed during the study period. This necessitated a flexible and heterogeneous approach to study recruitment, matching local treatment pathways. It was possible to introduce a novel treatment approach (biologic therapy) requiring specialist services (rheumatology), not normally a part of existing treatment pathways, within the context of a clinical trial. However, delivering this RCT was challenging, involving multiple professional groups across different health care organisations. In the future, additional feasibility studies, more efficient site set-up, improved and pilot-tested recruitment methods and longer recruitment periods might be appropriate.
There were four main factors that led to delays and early trial closure: contracting issues, securing the payment of ETCs, site withdrawal due to concerns about reactivating TB in a highly prevalent area, and a complex trial recruitment process that did not always match local care pathways. There were long delays agreeing and exchanging subcontracts with participating centres and sites, and contractual discussions with one site were never concluded. Earlier agreement between sponsor, university centres and NHS sites might have been facilitated by the use of model agreements such as the Brunswick research collaboration agreement ; site feasibility questionnaires; or research infrastructure that could facilitate the contracting process in multi-site research, such as the National Institute of Health Research Translational Research Partnership .
Negotiations for the ETCs were protracted in England, where responsibility for these costs had to be negotiated with different NHS organisations with competing cost pressures; new arrangements are needed . One site withdrew from the RCT before starting recruitment because of a change in the PI’s perception of acceptable risk in the local population, fuelled by recent high-profile media cases. Further discussions between the trial management group and the local PI around potential risks, related concerns and the degree of equipoise might have prevented site withdrawal.
During trial set-up new national management guidance was published , as well as a new national back pain and radicular pain pathway . In one site the local sciatica management pathway changed around the time that it opened to recruitment. This site initially relied only on referrals to its secondary care musculoskeletal service but later involved the primary care research network, which was starting to identify participants just before trial closure. In the other open site there were operational issues with identifying the research physiotherapist resource and fitting the trial around the clinical commitments of participating clinicians.
The main method for identifying participants was retrospective GP record review, but this had a low rate of response, with only a small proportion seen at the screening assessment. We had modelled the numbers of eligible participants for our recruitment projections on the previous Assessment and Treatment of Leg pain Associated with the Spine (ATLAS) cohort study, which identified patients in real time as they were consulting, with retrospective record review used only as a backup . Although we identified large numbers of potential participants, only small numbers returned reply slips indicating a willingness to participate. It is not known why potentially eligible participants did not wish to participate. Informal feedback suggested that some patients might have been much improved by the time they were contacted about the trial; some might have found the trial procedures too burdensome, such as the complex two-stage recruitment process; whilst others might not have wished to participate in an RCT, especially in a clinical trial of an investigational medicinal product involving a medication with significant potential adverse effects. Greater patient and public involvement could offer insights into how to explore this. Two of the clinical sites were going to recruit participants using the same methods as the ATLAS cohort, which have been used successfully in another RCT of primary care-delivered treatment for sciatica . However, these two sites signed their contracts just prior to trial closure. Although potential participants had started to be identified, there was insufficient time to recruit them.
The current management of RCTs within the United Kingdom has emphasised recruitment efficiency and delivery of outcomes within short timelines . This remains appropriate for treatments that fit within existing treatment pathways; when they do not, a new pathway must be developed specifically for the trial. In the current study we introduced medical screening and biologic therapy administration delivered through experienced secondary care rheumatology services. The heterogeneity of existing clinical pathways for sciatica (in primary and in secondary care) necessitated a multifaceted approach, with different solutions for different sites, requiring flexibility when pathways at single sites changed between the planning and execution of the trial.
Comparison with previous literature
The previous systematic review of biological agents for sciatica found a small number of RCTs and other studies with small numbers recruited . Many of these studies also had poor rates of recruitment, both in the UK NHS  and elsewhere in Europe .
Slow or inadequate recruitment to publicly funded multicentre RCTs is still a common problem . Systematic reviews of RCTs that compared methods to increase trial recruitment found that effective interventions included telephone or text reminders 2 weeks after receiving the letter of invitation, the use of lay advocates who were already involved in the study, monetary incentives, and non-blinding of trial participants. The evaluation of recruitment strategies within RCTs was advocated [49, 50]. Results of a systematic review concerning the recruitment activity of clinicians in RCTs include the use of qualitative research to identify and overcome recruitment barriers, reduction of clinical workload associated with participation in RCTs, extra training and protected research time .
Implications for future research
We make a number of recommendations for future researchers (Table 3). A number of these are pertinent to all RCTs conducted in the United Kingdom. For example, we would recommend full discussions between the sponsor’s contracting department and all university centres and NHS sites to obtain early agreement about what the contracts need to include and how the contracting process should be arranged, so that the university centres and the NHS sites have a clear understanding of their delegated roles and tasks. This may involve model contracts such as the Brunswick research collaboration agreements, which have been designed to be suitable for the majority of cases where two or more universities receive a joint research grant . Early discussions about site requirements, perhaps using a site feasibility questionnaire, early dialogue with sites’ research and development departments, and the early appointment of research staff in each site would facilitate trial set-up.
We also make recommendations pertinent to the circumstances of this particular RCT. The impact of research staff shortages, in this case a research physiotherapist at one site, could be avoided by having dedicated research staff. In addition, involvement of the research staff during the initial planning stage would have been useful for planning the recruitment strategy.
Further qualitative research is needed to identify reasons for low recruitment rates, using methods such as the QuinteT Recruitment Intervention, which uses a combination of standard and innovative qualitative research methods, with some simple quantification, to understand recruitment and identify sources of difficulty . Possible reasons for poor recruitment include concerns about the nature of the trial intervention and its side effects, perceived burden of trial participation, natural history of recovery of severe sciatica, perceptions about the nature of sciatica itself, and whether the treatment under study is consistent with these. People who believe that their sciatica will resolve quickly (either spontaneously or with treatment) are unlikely to commit to a trial of medical intervention with long follow-up, particularly if they perceive that it would not provide (and might delay) definitive treatment. Such beliefs in the study population might not be well-founded in evidence, and pre-recruitment education might be necessary to help potential participants appreciate the possible benefits that might be achieved from novel interventions that are being investigated.
Patient recruitment from ‘real-time’ GP consultations may have reduced the delays associated with retrospective checks of GP consultations and from referrals to physiotherapy and secondary care settings. Unfortunately, because of delays in agreeing ETCs and finalising contracts, there was insufficient time to recruit any participants using this method before trial closure.
A trial of biological therapy in patients with sciatica still needs to be performed, but it would require a clearer contracting process, qualitative research to ensure that patients (and clinicians) would be willing to participate, and more efficient recruitment methods, with the least possible burden on patients.
Assessment and Treatment of Leg pain Associated with the Spine
Clinical Commissioning Group
European Quality of Life-5 Dimensions 5-level version
Excess treatment cost
Health Technology Assessment
Medicine and Healthcare products Regulatory Agency
Magnetic resonance imaging
National Health Service
Oswestry Disability Index
Research and development
Randomised controlled trial
Research ethics committee
Tumour necrosis factor-α
Deyo R, Rainville J, Kent DL. What can the history and physical examination tell us about low back pain? JAMA. 1992;268:760–5.
Konstantinou K, Dunn KM. Sciatica: review of epidemiological studies and prevalence estimates. Spine. 2008;33:2464–72.
Weber H, Holme I, Amlie E. The natural course of acute sciatica with nerve root symptoms in a double-blind placebo-controlled trial evaluating the effect of piroxicam. Spine. 1993;18:1433–8.
Bush K, Cowan N, Katz DE, Gishen P. The natural history of sciatica associated with disc pathology; a prospective study with clinical and independent radiological follow-up. Spine. 1992;17:1205–12.
Tubach F, Beauté J, Leclerc A. Natural history and prognostic indicators of sciatica. J Clin Epidemiol. 2004;57:174–9.
National Institute for Health and Care Excellence (NICE). Low back pain and sciatica in over 16s: assessment and management. NICE Guideline. 2016. nice.org.uk/guidance/ng59. Accessed 3 Oct 2017.
UK Spine Societies Board. National Backpain Pathway. 2017. http://www.ukssb.com/pages/Improving-Spinal-Care-Project/National-Backpain-Pathway.html. Accessed 3 Oct 2017.
Koes B, van Tulder MW, Peul WC. Diagnosis and treatment of sciatica. BMJ. 2007;334:1313–7.
Luijsterburg P, Verhagen AP, Ostelo RW, van Os TA, Peul WC, Koes BW. Effectiveness of conservative treatments for the lumbosacral radicular syndrome: a systematic review. Eur Spine J. 2007;16:881–99.
Mixer W, Barr J. Rupture of the intervertebral disc with involvement of the spinal canal. N Engl J Med. 1934;211:210–5.
Goupille P, Jayson M, Valat JP, Freemont AJ. The role of inflammation in disc herniation associated radiculopathy. Semin Arthritis Rheum. 1998;28:60–71.
Revdivik B, Brown M, Lundborg G. Pathoanatomy and pathophysiology of nerve root compression. Spine. 1984;9:7–15.
Cooper RG, Freemont AJ. TNF-α blockade for herniated intervertebral disc-induced sciatica: a way forward at last? Rheumatol. 2004;43:119–21.
Lewis R, Williams NH, Sutton A, Burton K, Matar HE, Hendry M, et al. Comparative clinical effectiveness of management strategies for sciatica: systematic review and network meta-analyses. Spine J. 2015;15:1461–77.
Guo JR, Jin XJ, Shen HC, Wang H, Zhou X, Liu XQ, Zhu NN. A comparison of the efficacy and tolerability of the treatments for sciatica: a network meta-analysis. Ann Pharmacother. 2017;51:1041–52.
Williams N, Lewis R, Din NU, Matar HE, Fitzsimmons D, Phillips CJ, et al. A systematic review and meta-analysis of biological treatments targeting tumour necrosis factor α for sciatica. Eur Spine J. 2013;22:1921–35.
van Tulder MW, Koes B, Bouter LM. A cost of illness study of back pain in the Netherlands. Pain. 1995;62:233–40.
NHS England. What is a biosimilar medicine? 2015. https://www.england.nhs.uk/wp-content/uploads/2015/09/biosimilar-guide.pdf. Accessed 8 Nov 2017.
European Medicines Agency. 04/04/2012 Humira - EMEA/H/C/00481 -II/0082. http://www.ema.europa.eu/ema/index.jsp?curl=pages/medicines/human/medicines/000481/human_med_000822.jsp&mid=WC0b01ac058001d124&murl=menus/medicines/medicines.jsp. Accessed 7 Aug 2014.
Russell D, Hoare ZSJ, Whitaker R, Whitaker CJ, Russell IT. Generalized method for adaptive randomization in clinical trials. Stat Med. 2011;30:922–34.
Bakhtiary A, Safavi-Farokhi Z, Rezasoltani A. Lumbar stabilizing exercises improve activities of daily living in patients with lumbar disc herniation. J Back Musculoskelet Rehabil. 2005;18:55–60.
Albert H, Manniche C. The efficacy of systematic active conservative treatment for patients with severe sciatica: a single-blinded randomized clinical controlled trial. Spine. 2012;37:531–42.
Fairbank J, Couper J, Davies JB, O’Brien JP. The Oswestry low back pain disability questionnaire. Physiotherapy. 1980;66:271–3.
EuroQol Group. EuroQol: a new facility for the measurement of health related quality of life. Health Policy. 1999;16:199–208.
Roland M, Morris RA. Study of the natural history of back pain: part I: development of a reliable and sensitive measure of disability in low-back pain. Spine. 1983;8:141–4.
Kim M, Guilfoyle R, Seeley HM, Laing RJC. A modified Roland-Morris disability scale for the assessment of sciatica. Acta Neurochir. 2010;152:1549–53.
Grøvle L, Haugen AJ, Keller A, Natvig B, Brox JI, Grotle M. The bothersomeness of sciatica: patients’ self-report of paresthesia, weakness and leg pain. Eur Spine J. 2010;19:263–9.
Lacey R, Lewis M, Jordan K, Jinks C, Sim J. Pain location using a pain manikin. Spine. 2005;30:E455–8.
Zigmond A, Snaith RP. The Hospital Anxiety and Depression Scale. Acta Psychiatr Scand. 1983;67:361–70.
Ridyard C, Hughes DA. Methods for the collection of resource use data within clinical trials: a systematic review of studies funded by the UK health technology assessment program. Value Health. 2010;13:867–72.
Thorn J, Coast J, Cohen D, Hollingworth W, Knapp M, Noble SM, et al. Resource-use measurement based on patient recall: issues and challenges for economic evaluation. Appl Health Econ Health Pol. 2013;11:155–61.
Hill J, Dunn KM, Lewis M, Mullis R, Main CJ, Foster NE, et al. A primary care back pain screening tool: identifying patient subgroups for initial treatment. Arthritis Rheum. 2008;59:632–4.
Dunn K, Croft PR. The importance of symptom duration in determining prognosis. Pain. 2006;121:126–32.
Nicholas M. The pain self-efficacy questionnaire: taking pain into account. Eur J Pain. 2007;11:153–63.
Vlaeyen J, Kole-Snijders AMJ, Boren RGB, van Eek H. Fear of movement/(re)injury in chronic low back pain and its relation to behavioural performance. Pain. 1995;62:363–72.
International Conference on Harmonisation of technical requirements for registration of pharmaceuticals for human use - Good Clinical Practice. 1996. https://www.ich.org/fileadmin/Public_Web_Site/ICH_Products/Guidelines/Efficacy/E6/E6_R1_Guideline.pdf. Accessed 8 Nov 2017.
Department of Health. Attributing the costs of health and social care research and development. 2015. https://www.gov.uk/government/publications/guidance-on-attributing-the-costs-of-health-and-social-care-research. Accessed 8 Nov 2017.
Public Health England. Tuberculosis strategy for England 2015-2020. NHS England 2015. https://www.england.nhs.uk/tb-strategy. Accessed 8 Nov 2017.
Lloyd Johnson. Health experts call for action as tower hamlets ranked among worst London areas for TB. East London Lines Health 2015. http://www.eastlondonlines.co.uk/2015/10/tower-hamlets-among-worst-london-areas-for-tb/. Accessed 8 Nov 2017.
Association of Research Managers and Administrators. Brunswick Agreements. https://arma.ac.uk/updated-brunswick-agreements/. Accessed 12 Dec 2016.
National Institute of Health Research. Collaborations for early phase translational research. https://www.nihr.ac.uk/life-sciences-industry/access-to-expertise-and-collaborations/collaborations-for-early-phase-translational-research/. Accessed 8 Nov 2017.
NHS England. Excess treatment costs. 2015. https://www.england.nhs.uk/commissioning/research/etc/. Accessed 9 Nov 2017.
Konstantinou K, Dunn KM, Ogollah R, Vogel S, Hay EM, ATLAS study research team. Characteristics of patients with low back and leg pain seeking treatment in primary care: baseline results from the ATLAS cohort study. BMC Musculoskelet Disord. 2015;16:332.
Foster NE, Konstantinou K, Lewis M, Ogollah R, Dunn KM, van der Windt D, et al. The clinical and cost-effectiveness of stratified care for patients with sciatica: the SCOPiC randomised controlled trial protocol (ISRCTN75449581). BMC Musculoskelet Disord. 2017;18:172.
National Institute of Health Research. Push the pace. https://www.nihr.ac.uk/about-us/how-we-are-managed/boards-and-panels/push-the-pace.htm. Accessed 9 Nov 2017.
Okoro T, Tafazl S, Longworth S, Sell PJ. Tumour necrosis factor α-blocking agent (etanercept); a triple blind randomized controlled trial of its use in treatment of sciatica. J Spinal Disord Tech. 2010;23:74–7.
van der Gaag WH, van den Berg R, Koes BW, Bohnen AM, Hazen LMG, Peul WC, et al. Discontinuation of a randomised controlled trial in general practice due to unsuccessful patient recruitment. BJGP Open. 2017;1(3):BJGP-2016-0872.
Sully BGO, Julious SA, Nicholl J. A re-investigation of recruitment to randomised, controlled, multi-centre trials: a review of trials funded by two UK funding agencies. Trials. 2013;14:166.
Watson JM, Torgerson DJ. Increasing recruitment to trials: a review of randomised controlled trials. BMC Med Res Methodol. 2006;6:34.
Treweek S, Lockhart P, Pitkethly M, Cook JA, Kjeldstrom M, Johansen M, et al. Methods to improve recruitment to randomised controlled trials: Cochrane systematic review and meta-analysis. BMJ Open. 2013;3:e002360.
Fletcher P, Gheorgle A, Moore D, Wilson S, Damery S. Improving the recruitment activity in randomised controlled trials: a systematic review. BMJ Open. 2012;2:e000496.
Donovan JL, Rooshenas L, Jepson M, Elliott D, Wade J, Avery K, et al. Optimising recruitment and informed consent in randomised controlled trials: the development and implementation of the Quintet recruitment intervention (QRI). Trials. 2016;17:283.
Particular thanks go to all the SCIATiC study participants who gave their time to take part in the study. The authors also thank the NHS staff who screened patients and recruited participants in Betsi Cadwaladr University Health Board, Sherwood Forest NHS Foundation Trust and Royal Wolverhampton NHS Trust. In addition, the authors thank the physiotherapy department staff who provided support for the study; rheumatologists and their staff for supporting the study and providing access for researchers to the rheumatology clinics; rheumatology nurses for biologic counselling, recruiting participants and delivering the intervention; radiology department staff who provided support for the study; participating general medical practices for their contribution in identifying participants; research and development departments of the various NHS organisations involved, clinical research networks for their contribution to patient recruitment and data collection; Clinical Trials Unit staff of the North Wales Organisation for Randomised Trials in Health; the independent members of the trial steering committee and the data monitoring and ethics committee; and the Musculoskeletal Pain Clinical Studies Group of Arthritis Research UK for facilitating two workshops to develop the research idea and research proposal.
This work was supported by the National Institute for Health Research’s Health Technology Assessment Programme (grant number 12/201/02). The views and opinions expressed herein are those of the authors and do not necessarily reflect those of the HTA, NIHR, NHS or Department of Health.
Availability of data and materials
The datasets used during the current study are available from the corresponding author on reasonable request.
Ethics approval and consent to participate
The Wales REC 3 granted approval on 27 May 2015 (15/WA/105), and clinical trial authorisation from the Medicines and Healthcare products Regulatory Agency (MHRA) was granted on 15 April 2015 (21996/0002/001-0001). Informed consent was obtained from all participants in the study.
Consent for publication
NHW declares membership of the Health Technology Assessment (HTA) Primary Care, Community and Preventative Interventions Panel. DAH reports other grants from the National Institute for Health Research (NIHR) during the conduct of the study and membership of the HTA Clinical Trials Board from 2010 to 2016, the HTA Funding Teleconference from 2015 to 2016 and the Pharmaceuticals Panel from 2008 to 2012. EW reports receipt of other grants from NIHR during the conduct of the study. NEF declares membership of the HTA Primary Care, Community and Preventative Interventions Panel. DAW reports receipt of grants from Pfizer Ltd. and personal fees from Novartis Pharmaceuticals UK Ltd. and Pfizer Ltd. outside the submitted work. KK reports other grants from NIHR during the conduct of the study. JK reports receipt of personal fees from lectures (Pfizer Ltd., Merck & Co., Inc., and ORION Pharma GmbH), personal fees from a scientific advisory board (Axsome Therapeutics Inc.) and personal fees from stocks (ORION Pharma GmbH) outside the submitted work. SG reports receipt of grants from AbbVie Inc., Merck & Co., Inc., Pfizer Ltd., University Hospitals of Geneva, the Rheumasearch Foundation, Fondation de bienfaisance, Eugenio Litta and Centre de Recherches outside the submitted work.
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
About this article
Cite this article
Williams, N.H., Jenkins, A., Goulden, N. et al. Lessons learnt from a discontinued randomised controlled trial: adalimumab injection compared with placebo for patients receiving physiotherapy treatment for sciatica (Subcutaneous Injection of Adalimumab Trial compared with Control: SCIATiC). Trials 19, 408 (2018). https://doi.org/10.1186/s13063-018-2801-6