hepatitis c: a new era in treatment and cure adam deising, do lcdr mc usn director of hepatology...
TRANSCRIPT
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Hepatitis C: A New Era In Treatment And Cure
Adam Deising, DOLCDR MC USN
Director of HepatologyDepartment of GastroenterologyNaval Medical Center San Diego
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Disclosures I have no financial disclosures
I will be discussing some treatments that are not FDA approved and that are still in development
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Objectives Discuss the basic epidemiology and natural history of HCV and identify
which groups are at risk
Briefly review prior treatment therapies and current recommended available therapies with specific concentration on interferon-free treatments
Discuss new and upcoming treatment strategies in treatment naïve, experienced and difficult to treat populations
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Epidemiology and General StatisticsFirst identified in 1989, previously known as “non-A/non-B” viral
hepatitis
Leading chronic blood-borne pathogen in the US
Worldwide, 130 – 170 million are chronically infected 2.7 – 4 million infected in the US alone Prevalence in US veterans 2x than general population (2.8% vs 1.3%)1
Currently the leading underlying cause for liver transplantation and major factor for rising incidence of HCC**
1. Backus LI et al. Public Health Matters 2012
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Distribution of Fibrosis
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VirologySingle stranded RNA member of the Flaviviridae family
3 structural proteins and 7 non-structural (NS) proteins
Six genotypes (1 – 6) with various subtypes
Degree of viral loads do no predict stage of fibrosis or overall prognosis
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NS3/4A inhibitorsBoceprevir*Teleprevir*SimeprivirABT-450MK-5172
NS5B inhibitorSofosbuvirDasabuvir
NS5A inhibitorLedipasvirDaclatasvirOmbitasvirMK-8742
NS3 inhibitorAsunaprevir
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MESSINA ET AL. HEPATOLOGY, 2014 ahead of print
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Natural HistoryIncubation of HCV virus ranges from 2 – 23 weeks (mean 7.5
weeks)
Infected patients rarely present with acute clinical symptoms—most present with chronic elevation of liver enzymes
HCV RNA detected within 2 weeks of infection, HCV-Ab lags by 4-8 weeks
Loomba R et al. The natural history of acute hepatitis C: clinical presentation, laboratory findings and treatment outcomes. Aliment Pharmacol Ther. 2011 Mar;33(5):559-65.
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Factors That Increase Risk of Progression to CirrhosisHistologic stage at diagnosis
Duration of infection
Alcohol consumption >50g/day
Steatosis
Age > 40 years at the time of infection
Co-infection with HIV or HBV
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Risk of TransmissionBlood-borne pathogen, transmission mainly through
percutaneous exposure to blood
IV and intra-nasal drug use is most common means of transmission
Less common is needle stick injury, vertical transmission (~5%, highest risk in mother with high HCV titer + HIV), sexual (except MSM, which is high risk)
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Who To Screen?2012 CDC recommendation to perform at least a one time screen of all
patients born b/w 1945-1965 50% of patients were under-reporting their previous high risk behavior Patients in this birth cohort account for 3/4 of current infections
Yearly screening for persons who continue to inject drugs and HIV+ men who continue to have unprotected sex with men
Periodic testing should be offered to others with ongoing risk factors for exposure to HCV
AASLD / IDSA guidelines for HCV
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How To Screen?All persons with risk for HCV should be initially tested for a HCV
antibody (anti-HCV) If positive, it is recommended to proceed with a quant HCV RNA (detect
RNA 25 IU/ml or lower) RNA obtained in HCV Ab negative patients who are immunocompromised
or if acute HCV is suspected
Genotype HCV RNA + patients
Test for HIV and HBV to evaluate for co-infection (+/- RPR for high risk behavior)
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Basic recommendations:Minimal alcohol use (NO alcohol for those with cirrhosis)
Vaccinate against HAV and HBV, if not already immune
Flu vaccine yearly
Education on how to prevent transmission to others
Evaluation for evidence of advanced fibrosis Liver biopsy, imaging with US or MRI, non-invasive markers of fibrosis (Fibrosure,
fibroscan, MRI elastography)
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TreatmentBrief overview of where we were
Pre-2011: PEG/Riba2011: PEG/Riba + PI (TEL and BOC) for GT1 diseaseNOV/DEC 2013: Simeprevir and Sofosbuvir on the market
Multiple new medications are on the way
All oral, interferon-free therapy may (will) become standard of care
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Current Available Treatment Options
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Slide c/o Dr. Alexander Kuo, MD UCSD
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Interferon Intolerant or Ineligible
Molina et al. IAS July 2014, Melbourne
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Simeprevir + Sofosbuvir +/- RBV, to Treat Chronic Infection With HCV GT 1 in non-responders to PEG-IFN and RBV and Treatment-Naive
Patients: The COSMOS Study
Lawitz et al. Lancet. Published online 7/28/14
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Sim/Sof/RBV x 24 Sim/Sof x 24 Sim/Sof/RBV x 12 Sim/Sof x 12 Overall
Group 1: patients discontinued treatment for non-virologic reasons or missing data at time of assessment. SVR = 19/20 (95%) with these patients excluded
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PRESS RELEASE: OCTOBER 10, 2014
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Ledipasvier (NS5A) + Sofosbuvir (NS5B) Treatment naïve, GT 1a + 1b, up to 20% cirrhosis
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SVR 99% SVR >99%
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Treatment naïve, GT1a/1b, no cirrhosis
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202/215 (94%) 201/216 (93%) 208/216 (96%)
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Previous exposure to PEG/RBV or PEG/RBV/PI, ~20% cirrhotic, GT 1a/1b
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Prescribing Guidelines for SOF/LDV
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Genotype 2
Treatment naïve, non-cirrhotic—Sofosbuvir + weight based RBV x 12 weeks FISSION, POSITRON, VALENCE trials: 201/214 patients achieved SVR = 94%
Treatment experienced +/- cirrhosis x 12 weeks (VALENCE trial)
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Genotype 3
Sofosbuvir + RBV x 12 weeks: SVR ~60%
Extending SOF + RBV x 24 weeks (VALENCE trial)
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Genotype 3
SOF + PEG + RBV x 12 weeks 38/39 (97%) SVR in treatment naïve patients 10/12 (83%) SVR in treatment experienced with/without cirrhosis**
“For many patients with genotype 3, the adverse effects and increased monitoring requirements of PEG make this less acceptable than the recommended regimen of sofosbuvir plus weight-based RBV” (AASLD/IDSA HCV Guidance)
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Sofosbuvir + Ledipasvir in GT 3 + 4 SOF/LDV x 12 weeks in treatment naïve GT3 patients +/- Ribavirin1
SOF/LDV alone: SVR12 = 64% (16/25) SOF/LDV/Riba: SVR12 = 100% (26/26)
Ongoing trials for GT4 disease ION-4: phase 3 trial of LDV/SOF x 12 weeks in GT 1 or GT4 + HIV co-infection2
French trial, phase 2 of LDV/SOF in treatment naïve and experienced with GT4 and GT53
1. Gane, E et al. LDV/SOF fixed-dose combination is safe and effective in difficult to treat populations including GT3 patients, decompensated GT1 patients and GT1 patients with prior sofosbuvir experience. Oral presentation#6: 49 th annual meeting of EASL, April 9-13 2014, London, UK
2. Clinical trials.gov NCT020736563. Clinical trials.gov NCT0208
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Upcoming Treatment Options
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Slide c/o Dr. Alexander Kuo, MD UCSD
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Treatment naïve, non-cirrhotic patients ABT-450 = NS3/4A; Ombitasvir = NS5A inhibitor; Dasabuvir = NS5B inhibitor
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Treatment naïve or experienced (PEG-IFN + Riba), all patients with Childs A cirrhosis. Patients with thrombocytopenia (>/= 60K), low albumin and major depression included.
Exclusions: Childs B + C, prior treatment with Telaprevir or Boceprevir
1:1 stratified to receive either 12 or 24 weeks of treatment
Primary endpoint is SVR 12
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Difficult To Treat Populations
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HCV and HIV co-infected Minimal drug-drug interaction with sofosbuvir and ART therapies
Tipranavir/ritonavir: decrease sofosbuvir concentration Simeprevir: more drug-drug interactions SOF/LDV: Tipranavir/ritonavir: decrease SOF/LED concentration, several others containing
HIV PI/ritonavir + tenofovir (all can increase tenofovir concentration)
Post-liver and kidney transplant Both can be safely treated with sofosbuvir and simeprevir containing regimens SOF/LDV likely safe based on preliminary data No significant interaction with sofosbuvir and CNI, purine antagonists or mTOR inhibitors Co-administration not recommended with simeprevir and cyclosporine
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Childs B + C patients—should be referred for clinical trials Currently not recommended to treat these with interferon based therapy or
simeprevir based therapy due to the risk of further decompensation Sofosbuvir + Ribavirin can be considered for those who require immediate
treatment for up to 48 weeks of therapy Decompensated, pre-transplant Hepatocellular carcinoma who may be transplanted in the near future
SOF/LDV currently being studied in pre-transplant decompensated patients and post-transplant patients, including those with fibrosing cholestatic hepatitis (SOLAR-1 and SOLAR-2)1
1. Clinicaltrials.gov NCT01938430 and NCT02010255
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Who Can’t We Treat (yet)? Renal disease
Sofosbuvir, ledipasivr and simeprevir studied in CKD with GFR ≥ 30 and is safe Abbvie regimen also safe in patients with mild to moderate CKD Not studied in ESRD on HD or GFR ≤ 30, thus treatment with new DAAs is not
recommended in this population unless enrolled in a trial Studies are underway and more to come
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Treatment of Acute Hepatitis C Infection
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PRESS RELEASE: OCTOBER 8 2014 HCV-Ab and RNA recommended if suspicious for acute HCV
ALF secondary to acute HCV is rare (< 1% of ALF cases), those suspected of ALF should be evaluated by a transplant center
Monitor for serological clearance for 3-6 months and treat with DAA therapies per the treatment recommendations for chronic HCV infection
PEG-IFN + Riba for 16 weeks (GT 2 and 3) to 24 weeks (GT 1) can still be used for those who are interferon eligible. SVR = ~82% when treated within 12 weeks of acute HCV diagnosis
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So, do we now treat everyone?
What about the cost?
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Show Me The Money! Cost is an issue
What have we been paying? PEG-IFN/Riba x 48 weeks ~$36,000 PEG-IFN/Riba/TEL ~$86,000 PEG-IFN/Riba/BOC ~$72,000
Simeprevir + Sofosbuvir x 12 weeks ~$150,0001
Sofosbuvir + Ledipasvir: $63,000 (8 weeks); $94,500 (12 weeks)
Other DAA regimens ????—To be determined1 Hagan et al. Hepatology 2014;60:37-45
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Cost of liver transplant: ~$550,000
Expect a pricing competition
Cost of therapy will likely remain high for some time
Are there regulations on who we should not treat right now?
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What Do the HCV Guidance Recommendations Say? August 11 2014, HCV guidance recommendations were updated:
Treatment is recommended for patients with chronic HCV infection.
Treatment is assigned with the highest priority for those patients with advanced fibrosis (F3), those with compensated cirrhosis (F4), liver transplant recipients, and patients with severe extrahepatic HCV manifestations (Table 1)
Based on available resources, treatment should be prioritized as necessary so that patients at high risk for liver-related complications and severe extrahepatic HCV complications are given high priority (Table 1)
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Conclusions: Hepatitis C is now a curable disease for the vast majority of people
Treatment of HCV will decrease overall morbidity and mortality for these patients, decrease rates of HCC and HCV-related liver transplants
Prior null responders and those with cirrhosis are still the toughest to treat, some regiments may be better than others
Genotype 3 is now the new Genotype 1
More treatment options are on the way (very very soon!) and thus the treatment landscape will change within the next 6 months
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Conclusions: Cost is an issue and insurance companies may force people with indolent
disease to wait
Prediction: At some point HCV treatment may be in the hands of primary care
Up to date information can be found on the AASLD website or www.hcvguidelines.org
Am I going to be out of a job in 10-15 years?
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NASH—A Persistent Hurdle!
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• Daclatasvir (NS5A inhibitor) + Sofosbuvir x 24 weeks in GT 2 and 3• Daclatasvir + Sofosbuvir +/- Ribavirin for 12 or 24 weeks
• Naïve and prior treatment failures with TEL or BOC included,• F0 - F4 included
• SVR 12 for GT 2 + 3• GT 2: 92% (24/26)• GT 3: 89% (16/18)
• SVR GT 1: 98% (164/167); 1a (98% ,129/132) 1b (100%, 35/35)• SVR achieved in 84/85 who received 24 weeks and 80/82 who received 12
weeks • Addition of Ribavirn had no effect on SVR