delamanid central nervous system pharmacokinetics in
TRANSCRIPT
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Delamanid Central Nervous System Pharmacokinetics in Tuberculous
Meningitis
Liz Tucker, Assistant Professor of Pediatric Critical Care Medicine
On behalf of Lisa Pieterse, Matthew D. Zimmerman, Zarir F. Udwadia, Charles Peloquin, Maricelle Gler, Shashank Ganatra, Jeffrey Tornheim, Prerna Chawla, Janice
Caoilli, Sanjay K. Jain, Veronique Dartois, Kelly E. Dooley
International Workshop on Clinical Pharmacology of Tuberculosis Drugs
10/23/18
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Disclosures
• Otsuka provided Delamanid for the animal studies
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Background: CNS Tuberculosis
• Most severe form of extrapulmonary TB
• TB meningitis (TBM) accounts for 0.5-1%
• Disproportionately high mortality and morbidity– Young children
– HIV co-infection
• Meningeal exudate
• Hydrocephalus
• Vasculitis leads to strokes
Be NA 2009; Thwaites GE 2009; Schoeman JF 2000; Jain SK, Tobin DM, Tucker EW, et al Nat Immuno 2018; Figaji A 2013
Inflammatory exudate
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Background: Treatment• Fatal without treatment• Current regimen for sensitive
– RIF, INH, PZA, S (adult)– RIF, INH, PZA & EMB (children)– Steroids
• Poor CNS penetration– EMB, RIF
• Multidrug Resistance (MDR):– Rifampin-resistance associated
with 94% mortality – HIV-associated TBM:
• INH-resistance 1.78 fold increased risk of death
• MDR-TBM uniformly fatal
Vinnard C CID 2017; Tho DQ AAC 2012; Ruslami R Lancet ID 2013; Heemskerk AD NEJM 2016
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Neurobehavioral Deficits
Tucker et al, DMM 2016
Exudative Meningitis and Tuberculoma
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11C-Rifampin PET Bioimaging
• Rifampin is KEY anti-mycobacterial
• Bactericidal BUT poor CNS penetration
• Dynamic PET imaging to elucidate pharmacokinetics and penetration into lung granuloma
DeMarco, Jain et al 2015
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Paucity of 11C-Rifampin Signal in Brain
11C-Rifampin
18F-
FDG
11C
-Rif
amp
inC
T
M. tuberculosis-InfectedTucker, Ordonez, Peloquin, Jain et al, Manuscript Under Review
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Paucity of 11C-Rifampin Signal in Brain
11C-Rifampin
18F-
FDG
11C
-Rif
amp
inC
T
M. tuberculosis-InfectedTucker, Ordonez, Peloquin, Jain et al, Manuscript Under Review
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Decreased 11C-Rifampin Penetration into Brain Lesion with Treatment
Time-activity curves (TAC) of ONE rabbit imaged over weeks of treatment
Area under the curve (AUC) ratios of brain lesion/plasma comparing ALL rabbits
imaged over weeks of treatment
Tucker, Ordonez, Peloquin, Jain et al, Manuscript Under Review
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Rifampin Mass Spec shows Decreased Rifampin Penetration Overtime
Tucker, Ordonez, Peloquin, Jain et al, Manuscript Under Review
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Background: Delamanid• New TB drug by Otsuka Pharmaceutical Co., Ltd.
• Nitro-dihydro-imidazooxazole derivative
• Active against Mycobacterium tuberculosis– Inhibits mycolic acid synthesis
– MIC95 on agar media w/ 0.5% albumin = 12 ng/mL
• Side effects: Prolonged QTc, depression, headache
• Currently approved in European Union, Japan & Korea for 2nd line therapy (2014)– MDR
– Improved sputum clearance in pulm MDR-TB
• PK studies in rats demonstrated distribution into CNS, eyes, placenta and fetus– Higher levels in tissue compared to plasma
Sasahara K DMM 2015; Shibata M BDD 2017; Gler MT ENJM 2012;
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Delamanid Rabbit Protocol• 6-7 weeks old (~ teenagers)
– Uninfected (PBS)– Infected (M. tuberculosis)
• Delamanid 5 mg/kg via NG
• Plasma– 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 24, 36, & 48 hr
• CSF & Brain sample– Terminal samples– 9 & 24 hr
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Delamanid Results
Cmax of adults from trials: median= 357 ng/mL (range 124-1000); MIC95 12 ng/mL
Mumbai with XDR TBM
0 6 1 2
0
2 0 0
4 0 0
1 2 2 4 3 6 4 8
D e la m a n id P la s m a
H o u rs
ng
/mL
In fe c te d
U n in fe c te d
0 6 1 2
0
5
1 0
1 0
2 0
3 0
1 2 2 4 3 6 4 8
D M -6 7 0 5 P la s m a
H o u rsn
g/m
L
In fe c te d
U n in fe c te d
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Delamanid Results
MIC95 12 ng/mL
Mumbai with XDR TBM
9 2 4
0
1
2
3
4
C S F
H o u rs
ng
/mL
D e la m a n id In fe c te d
D M -6 7 0 5 In fe c te d
D e la m a n id U n in fe c te d
D M -6 7 0 5 U n in fe c te d
9 2 4
0
2 0 0
4 0 0
6 0 0
B ra in
H o u rs
ng
/mL
D e la m a n id In fe c te d
D M -6 7 0 5 In fe c te d
D e la m a n id U n in fe c te d
D M -6 7 0 5 U n in fe c te d
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Delamanid Results
9 2 4
0 .0 0
0 .0 2
0 .0 4
0 .0 6
0 .0 8
D e la m a n id C S F /P la s m a ra t io
H o u rs
Ra
tio
In fe c te d
C o n tro l
9 2 4
0
2
4
6
8
D e la m a n id B ra in /P la s m a ra t io
H o u rs
Ra
tio
In fe c te d
C o n tro l
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Clinical Relevance
• So what about patients?
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Patient with TBM-Mumbai• 26 year old female• No co-morbidities or hx of TB/TB contact• Presentation:
– Cough, fever, HA with decrease vision bilaterally– CSF GeneXpert: M. tuberculosis detected
• Rifampin resistance detected
• Imaging:– Brain MRI: meningeal enhancement with tuberculomas
• Course:– Started on 2nd line drugs & steroids– MGIT confirmed XDR-TBM– Initially good clinical & radiologic improvement– BUT relapsed 3 months after treatment stopped– Delamanid started & clinical samples obtained 5 wks later
• Capreomycin, Meropenem, Augmentin, Clofazimine, Linezolid, Cycloserine, para-aminosalicylic acid (PAS)
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Patient with TBM-Philippines• 35 year old male • HIV+• Presentation:
– Diagnosed October 2016– CSF: WBC 147 cells/µL, protein 96.10 mg/dL– CSF: culture grew M. tuberculosis; smear AFB+
• Rifampin & INH resistance detected
• Course:– Started on Levofloxacin, Amikacin, Prothionamide, Linezolid,
Meropenem, Bactrim, Augmentin– Initially improvement (CSF WBC 6 cells/µL, protein 64.57)– BUT worsened with RLE weakness with new nodules on MRI
• CSF WBC 486 cells/µL, protein 5319.89
– Delamanid started & clinical samples obtained 5 months later• Meropenem, Bedaquiline, Linezolid, Bactrim, Augmentin
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Delamanid Results
SampleConcentration (ng/mL)
Delamanid(Lab 1)
Delamanid(Lab 2)
DM-6705
Plasma T = 0 HR 550 773.5 109.3Plasma T = 2 HR 450 572.6 86.3Plasma T = 4 HR 750 1082.8 96.3Plasma T = 7 HR 740 848.3 95
CSF (4h) No Heparin BLQ 1.9 0.7CSF w/ Heparin 1.7 0.9
SampleConcentration (ng/mL)
Delamanid(Lab 1)
Delamanid(Lab 2)
DM-6705
Plasma T = 0 HR 465Plasma T = 2 HR 500Plasma T = 4 HR 473Plasma T = 7 HR 481
CSF (4h) 33
Cmax of adults from trials: median = 357 ng/mL (range 124-1000); MIC95 12 ng/mL
Mumbai with XDR TBMDelamanid 100mg BID
Philippines with XDR TBMDelamanid 100mg BID
CSF/Plasma ratio= 0.16%
CSF/Plasma ratio= 7%
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Patients – Where are they now?• Mumbai
– Completed 24 weeks of Delamanid
– Off steroids
– No HA or vision changes
• Philippines– Currently still receiving Delamanid (along with
Bedaquiline and Linezolid)
– Off steroids
– Awake and alert
– Receiving rehab to improve ambulation
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Conclusions• Delamanid CSF levels are low in TBM patients and rabbits • High Delamanid brain levels in rabbits compared to plasma
– Trend for higher in uninfected brain
• Can drugs with low CSF concentrations but high brain concentrations work for TBM?– CSF has low numbers of bacilli with unknown viability– Unknown degree & effect of protein binding– Antifungals work:
• Amphotericin and Isavuconazole for Cryptococcus (low CSF levels) • Echinocandins for Candidal meningoencephalitis (poor CSF
penetration but good efficacy)
• In order to develop optimal regimens, there need to be more preclinical and clinical data coupled with PK-PD modeling to integrate the data
Wiederhold AAC 2016, Warn AAC 2012
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Acknowledgements
Johns Hopkins Anesthesiology and Critical Care Medicine
Johns Hopkins Center for Tuberculosis Research & Center for Infection & Inflammation Imaging ResearchSanjay Jain’s LabAlvaro OrdonezMariah KlunkLisa Pieterse
FundingAll Children’s Hospital Foundation Grant (E.W.T.)NIH NICHD PCCTSDP 2K12HD047349-11 (E.W.T.)Director’s Transformative Research R01-EB020539 (S.K.J.)New Innovator Award DP2-OD006492 (S.K.J.)
Johns Hopkins Division of Clinical Pharmacology and Infectious DiseasesKelly E. Dooley
Hinduja Hospital, Mumbai, IndiaJeffrey Tornheim Zarir UdwadiaShashank Ganatra Tester AshavaidPrerna Chawla University of Florida Infectious Disease
Pharmacokinetic LabChuck Peloquin
Makati Medical Center, Makati City, PhilippinesMaricelle GlerJanice Caolli
Johns Hopkins All Children’s Hospital Center for Resources in Integrative Biology and Molecular Determinants Core
Public Health Research Institute, New Jersey Medical School, Rutgers, The State University of New JerseyVeronique Dartois’ LabMatthew D. Zimmerman
OtsukaLawerence GeiterYongge LiuJeffrey Hafkin