Scaling up LTBI Treatment with Short Course Regimens

Transcription

1 April 2016 Scaling up LTBI Treatment with Short Course Regimens Carol Dukes Hamilton, MD, MHS Director, Scientific Affairs, FHI 360 Professor of Medicine, Duke University

2 Disclosures past 12 months No financial disclosures Will be discussing off-label use for rifampin for treatment of latent TB infection (LTBI) Investigator/author on 2 referenced studies Sterling et al; N Engl J Med 2011;365: TB Trials Consortium Holland et al; PLoS ONE, vol 6; 2011; e22276 Investigator with the TB Trials Consortium

3 Scaling Up Treatment of LTBI Objectives: Recognize the benefits and risks of LTBI treatment options in order to reduce morbidity from LTBI treatment Understand and be able to use new LTBI treatment options to increase the number of patients completing treatment for LTBI

4 Scaling up : Ingredients? Ramp up, expand coverage, broaden application Specific product (e.g., mobile phones) Strategy (e.g., provider-initiated HIV C&T) Rationale: What are we trying to achieve? TB Elimination, draining the reservoir of latent TB Evidence of efficacy, effectiveness Affordable Hopefully evidence of cost-effectiveness Steady supply if product-based

5 Scaling up: Getting There? Systematize Put in existing system, e.g., routine contact investigation leads to identification of high-risk LTBI If no systems, create Educate Private and public health care providers Public (targeted? Who, where?) Fund Measure progress

6 Scaling up : Rationale It is estimated that as much of 1/3 of world s population has evidence of latent TB infection Serves as reservoir of future cases Proportion of local population that progresses to active TB depends on population co-factors: o Innate immunity & ongoing community transmission o Burden of silicosis, HIV/AIDS, diabetes mellitus, smoking, iatrogenic immunosuppression o Socioeconomics: crowded living conditions, malnutrition, poor education 6

7 Scope of Problem: Enormous Reservoir of Latent TB ~ 1/3 world s population with LTBI Progress to Active TB

8 Spillover to active TB can be. Modest.think Mexico, much of Latin America A trickle e.g., USA, Canada, Europe, New Zealand, Australia, Japan 8

9 Spillover to active TB can be. Frequent, potentially accelerating. Think countries of former Soviet Union eastern Europe, parts of Asia Overwhelming. Southern Africa coinciding with HIV/AIDS epidemic 9

10 Impact of Addressing the Reservoirs US & Canada: Scope & Impact of Treating LTBI Studied LTBI practices in % of LTBI identified and treated in public health clinics Immigrant/refugee clinics (6.4%), correctional/detention centers 6.1% Drying up the reservoir! Extrapolated to estimate that between 4-11,000 future TB cases prevented by activities that year Sterling, TB Epi Consortium; AJRCCM, 2006,

11 Most Effective Interventions? Or, where to spend the $$? Number of cases Number of deaths Treating LTBI Treating LTBI TB Morbidity TB Morality Abu-Raddad et al; PNAS 106: ; 2009

12 Scaling up : Ingredients? Ramp up, expand coverage, broaden application Specific product (e.g., mobile phones) Strategy (e.g., provider-initiated HIV C&T) Rationale: What are we trying to achieve? TB Elimination, draining the reservoir of latent TB Evidence of efficacy, effectiveness Affordable Hopefully evidence of cost-effectiveness Steady supply if product-based

13 Latent TB Infection (LTBI) Active TB Continuum from exposure to infection to latency to active disease Opportunity to intervene

14 Latent TB Infection (LTBI): Not Really Latent Trends in Microbiology, Young, 2009,

15 Latent TB Infection (LTBI) Active TB Continuum from exposure to infection to latency to active disease Opportunity to intervene Certain populations EXTREMELY vulnerable Recent close contacts to a case, especially infants and children <4 years HIV/AIDS; other immunosuppressed (TNF-inhibitors) Newly arriving immigrants with abnormal chest x-rays Identifying vulnerable populations can lead to efficient targeted testing for LTBI

16 Evidence for Long-course treatment LTBI with INH Isoniazid (INH) discovered and determined effective for treatment of active TB in 1952 Rapidly bactericidal in animal models and humans disease Let to large scale clinical trials of INH to prevent development of disease

17 Evidence for Long-course treatment LTBI with INH Union (IUAT) trials of 27,830 subjects with TST+ and fibrotic lesions on CXR in eastern Europe Placebo-controlled randomized clinical trial (INH versus placebo) Compared 12-week to 24 weeks to 52 weeks INH/placebo Bull WHO 60: ; 1982

18 Evidence for Long-course treatment LTBI with INH Completion: Shorter is better 87% completed 12 weeks 78% completed 24 weeks 68% completed 52 weeks Efficacy: Longer is better 21% reduction in TB cases with 12 weeks treatment 65% reduction.. with 24 weeks treatment 75% reduction.. with 52 weeks treatment Bull WHO 60: ; 1982

19 Evidence for Long-course treatment LTBI with INH WHO LTBI Guidelines, 2015, evidence table

20 Long-course treatment LTBI with INH: Limitations TBESC study (Colson et al, 2013, IJTLD) 29% eligible for TLTBI refused to participate in study Of those enrolled in study, 89% agreed to TLTBI Completion of 6-9 month INH 20-60% range Boston study, mostly foreign-born population, 29% finished 6 months INH (Shieh et al; 2006, AJRCCM) Multi-site study of close contacts, 63% completed (Fiske et al, 2014, IJTLD) Commonly sited reasons for discontinuation: Side effects, time away from work or family, resistance to taking medicine when not sick *LoBue, Moser; AJRCCM 168; 443-7; 2003

21 Long-course treatment LTBI with INH: Is There a Better Way? WHO LTBI Guidelines, 2015, evidence table

22 Scaling up : Ingredients? Ramp up, expand coverage, broaden application Specific product (e.g., mobile phones) Strategy (e.g., provider-initiated HIV C&T) Rationale: What are we trying to achieve? TB Elimination, draining the reservoir of latent TB Evidence of efficacy, effectiveness Affordable Hopefully evidence of cost-effectiveness Steady supply if product-based

23 Scaling up : Current Approach Not Working NEED A SHORTER DRUG REGIMEN THAN 9 months IPT!

24 PREVENT TB*: RCT 9H versus 3HP 9 INH Arm INH 300 mg Self-administered Daily, 9 months 3HP Arm INH 900 mg + RPT 900 mg DOT Weekly, 3 months TB Trials Consortium study: US, Canada, Brazil, Spain & Hong Kong enrolled high risk adults and children with LTBI (e.g., recent contacts to a case, recent conversions), (children > age 2) and HIV-infected (not on ARV) Followed each for 2 years after end of treatment *Sterling et al; N Engl J Med 2011;365: (adults); pediatric data in press; HIV data CROI

25 PREVENT TB: RCT 9H versus 3HP Conclusions for all populations studied (adults, children, HIV+): Weekly 3HP by DOT was at least as effective as 9H by selfadministration Met non-inferiority criteria Among adults, 3HP TB rate was approximately half that of 9H in adult, non-hiv The 3HP completion rate was significantly higher than 9H 3HP was safe relative to 9H Lower rates of any adverse event, and less hepatotoxicity attributable to study drug ClinicalTrials.gov: NCT

26 Subsequent Studies show it is safe and effective in: *children down to age 2 *persons living with HIV/AIDS (caution RPT drug-drug-interaction) *self-administered

27 Scaling up : Ingredients? Ramp up, expand coverage, broaden application Specific product (e.g., mobile phones) Strategy (e.g., provider-initiated HIV C&T) Rationale: What are we trying to achieve? TB Elimination, draining the reservoir of latent TB Evidence of efficacy, effectiveness Manage side-effects, toxicities Affordable Hopefully evidence of cost-effectiveness Steady supply if product-based

28 Overview Toxicities of All LTBI Treatment Regimens Hepatotoxicity Less if regimen excludes daily INH Drug-drug interactions Many if regimen w/rif or RPT Syncope/hypersensitivity syndrome: Unique to 12 HP Requires counseling and education Serious episodes rare, but potential for harm Mild: Dizziness, rash can try a second dose Moderate to severe (syncope) or allergic reactions: bronchospasm/wheezing, urticarial, angioedema No further doses; manage as other allergy/anaphylaxic

29 Scaling up : Ingredients? Ramp up, expand coverage, broaden application Specific product (e.g., mobile phones) Strategy (e.g., provider-initiated HIV C&T) Rationale: What are we trying to achieve? TB Elimination, draining the reservoir of latent TB Evidence of efficacy, effectiveness Manage side-effects, toxicities Affordable Hopefully evidence of cost-effectiveness Steady supply if product-based

30 Scaling up : Affordability of 3 HP Expense of PRIFTIN Started at $52/32-tablet blister pack : $32/pack (need 2.25 packs per course, adults) 2016: Course of treatment Rifapentine & INH $ $1.00* *California FAQ sheet estimates total $147/month with clinic visit and DOT Modeling study** showed that even at $52/pack and with DOT, 3-month HP more cost effective than 9H Fewer TB cases because of greater uptake, completion, less toxicity **Holland et al; PLoS ONE, vol 6; 2011; e22276

31 Scaling up 3 HP: DOT and the iadhere Study iadhere randomized participants into selfadministered, with or without SMS reminders, compared to DOPT Recognizing that DOPT is almost certainly going to result in higher completion rates, but affordable, sustainable? Therefore planned on a non-inferiority statistical approach, i.e., will SA no more than than 15% lessgood than DOPT

32 Belknap R et al; CROI 2015, manuscript in preparation iadhere: Comparable Completion Rates Selfadministered Compared to DOPT

33 Shorter Treatment Options for LTBI? 2 months rifampin and pyrazinamide Efficacy similar to INH But significant hepatotoxicity outside HIV+ populations INH and rifampin for 3 months 5 trials, total of 1,926 adults (meta-analysis)* Hong Kong, Spain, Uganda Estimated similar efficacy to INH, also similar toxicity Rifampin for 3 months One study (silicosis + TST+) showed 63% efficacy Less toxicity than INH Rifampin for 4 months RIF 4 months has become default regimen in many places due to higher uptake, low toxicity, despite very limited data Currently being evaluated in RCT (Menzies et al) *Ena, Valls; CID 40:670-6; 2005

34 Toxicities of Regimens Hepatotoxicity Less with any regimen that excludes INH Drug-drug interactions More with any regimen that includes rifampin or rifapentine Syncope/hypersensitivity syndrome Associated with once-weekly HP Requires counseling and education Discontinuation if occurs Serious episodes rare, but potential for harm

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36 Scaling up : Ingredients? Ramp up, expand coverage, broaden application Specific product (e.g., mobile phones) Strategy (e.g., provider-initiated HIV C&T) Rationale: What are we trying to achieve? TB Elimination, draining the reservoir of latent TB Evidence of efficacy, effectiveness Manage side-effects, toxicities Affordable Hopefully evidence of cost-effectiveness Steady supply if product-based Assume YES

37 Scaling up: Getting There? Systematize Put in existing system, e.g., routine contact investigation leads to identification of high-risk LTBI Educate If no systems, create Give practitioners experience Private and public health care providers Public (targeted? Who, where?) Fund Measure progress

38 Post-marketing Project Objectives Monitor for adverse events with 3HP in non-research settings Track number of patients started on regimen Note if certain populations, risk factors or settings are associated with adverse effects (AE) more often Assess compliance and treatment completion Assess impact of 3HP on programs Staffing Costs Match patients with TB registry at 2 years Observational measurement of effectiveness Surveillance for drug-resistant TB after LTBI treatment Near-final data, with permission, Ho, Nwana, et al, CDC Field Services Branch, Presentation 2015 Union meetings, Cape Town

39 Post-marketing 3HP Surveillance Project Patients Started on 3HP, June 2011 December ,327 patients started on 3HP 39 Ineligible to complete Index-case resistant: 20 QFT negative/not LTBI: 2 Active TB case: 1 Pregnant: 14 HIV + receiving HAART: 2 3,288 patients eligible to complete treatment 421 (12.8%) discontinued treatment 2,867 (87.2%) completed treatment 246 (7.5%) discontinued with symptoms 175 (5.3%) discontinued due to other reasons

40 Treatment Completion Rate (%) Range of Treatment Completion Across 16 U.S. Sites, June 2011 December * L E J A F D I N K H O P C B G M Participating Site Number of participants at each site ranged from 14 to 1,018 Completion ranged from % Discontinuation while reporting symptoms ranged from 0 16% * Proportion completing treatment among those eligible to complete at that site Near-final data, with permission, Ho, Nwana, et al, CDC Field Services Branch, Presentation 2015 Union meetings, Cape Town

41 Demographic Factors and Treatment Reasons Associated with Discontinuation of 3HP, N=3,288 Discontinued Multivariate Completed Univariate N p-value arr N (%) RR (%) p-value Age (years) 1.01 <.001 (2-17) (94.5) (5.5) >=65 Race/Ethnicity Non-Hispanic White Treatment Reason Contact Corrections Homeless Student 154 (78.6) 595 (82.5) 751 (91.5) 451 (87.4) 147 (81.2) 123 (94.6) 42 (21.4) 126 (17.5) 70 (8.5) 65 (12.6) 34 (18.8) 7 (5.4) 1.72 < <

42 Scaling up: Getting There? Education, Systemization California TBCB 3 HP FAQ Sheet

43 Scaling up: Getting There? Systematize Put in existing system, e.g., routine contact investigation leads to identification of high-risk LTBI Educate If no systems, create Give practitioners experience Private and public health care providers Public (targeted? Who, where?) Fund Measure progress

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45 Reported Symptoms for Patients on 3HP and Treatment Completion % 12% 5% 3% 8% 8% 7% 6% 6% 6% 3% 2% 5% 3% 4% 4% 2% 2% 3% 2% 4% 1% 1% 1% 0.7% 10% 9% 5% 5% 3% 4% 4% 3% 3% 3% 3% 5% Completed Tx Discontinued Tx Other symptoms reported by one or more patients include: Dermatological-related Symptom, Gastro-Intestinal related Symptoms, Cough, Mental Health Symptom, Weight Loss, Blurred Vision, Flu-like Symptoms, Breathing Problem, Back Pain, Gynecological-related Symptoms, Chest Pain, Diaphoresis, Angioedema, Bleeding, Palpitation, Ease Bruising, Edema, Neurologic Symptoms, Hypotension, Flushing, Red Eyes, URI, Genitourinary Symptoms, Other Eye Symptom, Black Stool, Pain, Pneumonia, and Sepsis. *Patients can have more than one symptom

46 Updating LTBI Testing and Treatment Guidelines Updating the 2000 LTBI Guidelines In process since 2011 Co-sponsored by ATS (MTPI Assembly), CDC and IDSA and in-kind author support from institutions Working with NTCA to create companion how-to document

47 Conclusions: Scaling Up Treatment of LTBI Targeted testing and treatment of high-risk individuals is necessary for TB Elimination in the US We now have important new tools IGRAs more specific, may help with FB populations Shorter regimens higher acceptance and completion Agreement across international normative bodies embracing short-course regimens ATS/CDC/IDSA LTBI treatment guideline update in progress Canada, WHO embrace

48 Acknowledgements Conveners of Annual meeting for invitation Charlie Crane National TB Controllers Association Review and work together on guidelines, and guideline supplement CDC s ongoing support for TB Trials Consortium Ken Castro, Andy Vernon Tim Sterling, Elsa Villarino and all other TBTC investigators for Study 26/PREVENT TB Chistine Ho, Nwana, et al, CDC Field Services Branch, for generously sharing their data Jason Stout (Duke), David Holland