An Open-label RCT to Evaluate a New Treatment Regimen for Patients With Multi-drug Resistant Tuberculosis
Information source: University of Cape Town
ClinicalTrials.gov processed this data on August 23, 2015 Link to the current ClinicalTrials.gov record.
Condition(s) targeted: Tuberculosis; Multidrug Resistant Tuberculosis; Extremely-drug Resistant Tuberculosis
Intervention: Linezolid (Drug); Bedaquiline (Drug); Levofloxacin (Drug); Pyrazinamide (Drug); Isoniazid (Drug); Ethionamide (Drug); Terizidone (Drug); Moxifloxacin (Drug); Kanamycin (Drug)
Phase: Phase 2/Phase 3
Status: Not yet recruiting
Sponsored by: University of Cape Town Overall contact: Aliasgar Esmail, DM, Phone: +27214047654, Ext: 6119, Email: a.esmail@uct.ac.za
Summary
This study aims to evaluate the impact of a new injection-free six-to-nine month treatment
regimen of linezolid, bedaquiline, levofloxacin, pyrazinamide (PZA) and ethionamide/high
dose isoniazid (INH) compared to the conventional empiric injection-based regimen of 21-24
months treatment. The secondary aim is to determine if other treatment-related outcomes
including adverse events, adherence to treatment, culture conversion, and cure/completion
are significantly different in the intervention and conventional arms.
Clinical Details
Official title: Evaluating a New Treatment Regimen for Patients With Multidrug-resistant TB (MDR-TB) - a Prospective Open-label Randomised Controlled Trial
Study design: Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment
Primary outcome: Treatment success
Secondary outcome: Favourable outcome rateTime specific rate of treatment failure. Time specific culture conversion rates. Time specific relapse rate. Rate of re-infection. All cause mortality Composite measure of QT interval on ECG, grade 3 and 4 adverse events, stopping drugs due to intolerance, adherence. Default rate Rate of loss of follow-up.
Detailed description:
Background: TB is completely out of control in South Africa and is now officially the most
common cause of death in this country. Alarmingly, the gravity if this pandemic has now been
compounded by the emergence of multidrug-resistant TB (MDR-TB), which constitutes resistance
to the two most potent anti-tuberculous drugs, namely rifampicin and isoniazid (2). XDR-TB
refers to resistance to rifampicin, isoniazid, any fluoroquinolone, and any second line
injectable drug (amikacin, kanamycin, or capreomycin). MDR-TB is a burgeoning epidemic in
South Africa, with rates trebling over the last decade (6). It is of considerable concern
because mortality is high (up to 50% in South Africa) and it often affects economically
active young adults. It is also a major threat to health care workers in South Africa. We
recently showed a rate in SA health care workers 6 fold higher than the general population
(7) further exacerbating the shortage of this critical workforce in the country. The
increasing cost to manage this disease is unsustainable. The on-going epidemic of
drug-resistant TB has the capacity to destabilise our entire National TB Programme (NTP).
Although drug-resistant TB comprises less than 2% of the total caseload in the country
(approximately ½ million patients with TB treated per year), it consumes almost 40% of the
total national TB programme budget, and more than 60% of the total TB drug budget (8). This
is not sustainable and drug-resistant TB therefore has the capacity to destabilise
functional TB control programmes in many countries in Africa.
The current treatment of MDR-TB is arduous, with a six to eight month intensive phase of
daily painful injections of Kanamycin combined with oral pyrazinamide, a fluoroquinolone
(moxifloxacin or levofloxacin), prothionamide and either cycloserine or para-aminosalicylic
acid (if cycloserine cannot be used). Treatment continues for 18 months after consecutive
negative sputum cultures, and lasts at least 20 months. There are substantial
drug-associated toxicities and adverse events that frequently lead to interruption or
cessation of treatment.
This study proposes to test the efficacy of a new drug regimen for the treatment of MDR-TB
which is of short term duration and which does not contain an injectable drug, thus making
treatment easier to administer and thereby potentially increasing compliance. All the drugs
will be available to the NTP if the study is shown to be successful. This regimen will
comprise linezolid, bedaquiline, levofloxacin, PZA and either ethionamide or high dose INH.
A gene-directed diagnostic approach (mutational analysis) will be used in the interventional
arm to individualise therapy and to inform on the use of high dose INH versus ethionamide.
Furthermore, in the proposed study the key aim is to test a regimen (rather than an
individual drug) and will look at how the outcomes (24 month), including treatment
completion/cure (i. e. treatment success which is the primary outcome) and mortality, are
impacted. It is expected that introduction of a shortened effective regimen will reduce drop
out and drastically reduce mortality and on-going transmission. Moreover, the rates of
XDR-TB and TDR-TB may also decline.
The study will be conducted at 5 trial sites in South Africa that are designated MDR-TB
treatment facilities and it many cases patients will be recruited from the satellite clinics
of these centres reflecting the decentralized MDR-TB program. All the sites have the
necessary expertise and facilities to carry out the proposed study. The study is a fully
conceived and funded within South Africa.
Eligibility
Minimum age: 18 Years.
Maximum age: N/A.
Gender(s): Both.
Criteria:
Inclusion Criteria:
- Newly diagnosed culture and/or GeneXpert positive pulmonary TB.
- Rifampicin resistance detected using at least two susceptibility testing assays
(GeneXpert, HainMTBDRplus or phenotypic) using a sputum sample during screening.
- Provide written informed consent prior to all trial-related procedures including HIV
testing.
- Male or female aged 18 years and older.
- Body weight between 40 and 90 kg, inclusive.
- Women of non-childbearing potential or participants of either sex who are using or
willing to use effective methods of birth control
Exclusion Criteria:
- A participant who in the opinion of the investigator is unlikely to cope with regular
visits to the trial site either because of travel constraints, or because of drug or
alcohol abuse, or other reason.
- Known at screening to have XDR-TB or pre-XDR-TB (i. e. fluoroquinolone or second-line
injectable drug (SLID) resistance i. e. to capreomycin, amikacin and kanamycin).
- Previous history of treatment for MDR-TB or XDR-TB or previous treatment with
bedaquiline.
- Currently on MDR-TB treatment for more than 2 weeks.
- Any participant with a Karnofsky score < 50.
- Known allergy to any of the trial drugs or related substances.
- Having participated in other clinical studies within 8 weeks prior to trial start
where investigational agents were used that may potentially impact current trial
outcome.
- Presence (or evidence) of symptomatic neuropathy grade 3 or higher.
- Epilepsy where drugs prolonging QT interval are used.
- Participant who is pregnant, breast-feeding (and not willing to stop), or planning to
conceive a child within 6 months of cessation of treatment.
- Incompatibility between microbiological and clinical/ radiological findings (i. e.
where the clinical and/or radiological findings are discordant with microbiological
testing suggesting laboratory contamination).
- Participants with ECG abnormalities, in particular QT prolongation.
- Any pre-existing laboratory abnormality which in the opinion of the investigator will
place the participant at risk. Patients with any of the following baseline laboratory
abnormalities will be excluded from the study:
- Creatinine grade 2 or worse (>1. 4 times ULN)
- Hemoglobin level grade 4 (HB <6. 5g/dL)
- Platelets grade 3 or worse (<49999 x 109/L)
- ALT grade 3 or worse (>5 times ULN)
- Total bilirubin grade 3 or worse (>2. 5 times ULN)
- Specific prior or concurrent medication/treatments (see Restrictions section below,
Table 3).
- Rifampicin monoresistant TB.
- Fluoroquinolone and/or SLID resistance. Although in South Africa, the standard of
care does not single out MDR-TB with fluoroquinolone or aminoglycoside resistance at
initiation of MDR-TB treatment, in this study the Hain MTBDRsl LPA will be used on
the sputum sample to exclude any pre-XDR and XDR cases from participation in the
study (results from the LPA and phenotypic DST testing on the isolate will be
available 3-6 weeks later).
All inclusion and no exclusion criteria must be met prior to enrolment and randomisation.
Whenever the investigator has reason to suspect that there might be a health problem
(other than TB) participation should only be considered after discussing the case with the
medical monitor. Note: Participants who are currently on, or have previously been on
drug-sensitive TB treatment are not excluded from participation.
Post-randomisation exclusion criteria:
• Fluoroquinolone and/or SLID resistance detected on DST using the isolate. Note: A woman
who falls pregnant during the treatment phase of the trial will not be excluded but will
be counselled regarding potential termination of pregnancy.
Locations and Contacts
Aliasgar Esmail, DM, Phone: +27214047654, Ext: 6119, Email: a.esmail@uct.ac.za Additional Information
Starting date: June 2015
Last updated: June 19, 2015
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