hcv tx update 2012 townshend
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Hepatitis C TREATMENT 2012
Lisa Townshend-Bulson, MSN, FNP-CAlaska Native Tribal Health Consortium
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Objectives Define Sustained Virologic Response (SVR)
Identify candidates for hepatitis C treatment
Differentiate appropriate treatment by genotype
Identify factors associated with treatment response
Recognize common side effects of treatment
Recognize key drug interactions with telaprevir and boceprevir
Discuss future treatment of hepatitis C
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Why Treat HCV? Sustained Virologic Response (SVR) =
Undetectable HCV RNA 6 months after completing treatment
SVR is considered a cure (Swain, Gastroenterology Nov 2010; 139(5):1593-601.)
Risk of developing decompensated cirrhosis is greatly reduced and
Regression of cirrhosis can occur (Mallet Ann Int Med 2008;149:399-403)
Risk of hepatocellular carcinoma (HCC) in those with cirrhosis reduced
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Consider Treatment Now
Patients with bridging fibrosis or cirrhosis on liver biopsy
Patients with HCV and HIV coinfection (early and mild disease)
Patients with acute hepatitis C who do not clear virus spontaneously
Patients with mild disease
Not urgent
If circumstances are right and no contraindications
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Candidates for HCV Treatment
Persons who are motivated to get better
Genotype 1 after biopsy (recommended, not req’d)
Genotype 2 & 3 without biopsy
Persons not interested in getting pregnant/fathering a
child in next 12-24 months
Rehabilitated alcoholics/drug abusers: 6-month abstinence
from alcohol & drugs before treatment
AUDIT-C Alcohol Screening Tool
Random drug screening
Persons not depressed or depression well-controlled
PHQ-9/Prime-MD Depression Screening Tool
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Do Not Treat
Clinically decompensated cirrhosisascites variceal bleedingcoagulopathy encephalopathy
Kidney, liver, heart or other solid-organ transplant
When contraindications to peginterferon, ribavirin and protease inhibitors exist (see later slides)
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Factors Affecting Treatment Response Genotype Viral load Age Fibrosis stage Insulin resistance Steatosis IL28B genotype Vitamin D level Coffee Consumption
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IL28B and Hepatitis C CC= Good response TT = Poor response CT = Intermediate response
(heterozygous)
40%
52%
8%
IL-28b in AN/AIs in Alaska
CC
CT
TT
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DL Ge et al. Nature, 461, 399-401, 2009.
Percentage of treatment induced SVR by genotypes of rs12979860
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Vitamin D Levels and HCV 197 HCV genotype 1 patients receiving
IFN-RBV therapy; 49 healthy controls matched by age and sex
25 (OH) D levels significantly lower in HCV persons (25) vs. controls (43); p<0.001)
Low levels significantly associated with: Female sex, increased liver inflammation, increased liver fibrosis and decreased SVR
Hepatology 2010;51:1158-67
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Vitamin D Levels in AN/AIs with Hepatitis C in Alaska
73%
27%
<30>30
223 tested
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Coffee Consumption and HCV
HALT-C trial serial liver biopsies q2 years Coffee consumption > 3 cups/day
associated with: Significantly reduced fibrosis (Hepatology
2009;50:1360-9) Significantly better response to Peg
IFN+RBV (Freedman et al, Gastroenterology 2011; 140(7): 1961-1969)
Quantity of coffee consumption associated with decreased risk of HCC(Hepatology 2008; 48:129-36)
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History of Hepatitis C Treatment SVR
Interferon α 1992-1998
Inf α/Rib 1998-2002
PegInf/Rib 2002-2011
PegInf/Rib/PI 2011…
0
10
20
30
40
50
60
70
80
90
100
9
29
44
75
30
62
75
G1 SVR %
G 2/3 SVR %
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Genotype 1 Peginterferon/Ribavirin Treatment Response Rates by Ethnicity
Asian: ~60%+
Caucasian: ~50%
Hispanic: ~30%
African American: ~10%-20%
Alaska Native/American Indian Persons (AI/AN): 32-46%
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AN/AI Treatment Outcomes Peg-IFN/RBV through 2011
SVR in those who
Genotype Treated Discontinued Failed Relapsed SVR* completed tx 1 43 20 (47%) 10 3 10 (23%) 10/23
(43%)
2 37 7 (19%) 3 3 26 *(70%) 24/30 (80%)
3 20 7 (35%) 1 2 10 (50%) 10/13 (77%)
Total 100 34 (34%) 14 8 46 (46%) 46/66 (70)%
*Includes pts who discontinued tx and still achieved SVR
S Livingston et al, ANTHC, Circumpolar Health Conference Abstract 2012
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How Often Do Persons Complete Treatment
Peginterferon/ribavirin clinical trials: Dropout rates 10-15%
VA study: Dropout rate 77.5% 134,934 patients with HCV, 16,043 treated (12%)
10,641 with 1 year data: 2,394 completed treatment (22.5%)
Only 1 in 56 patients with known HCV finish treatment
(AA Butt et al. Liver Int. 2010 Aug;30(7):1082)
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Difficulties in Treating HCV
Many patients have medical or psychiatric contraindications Prospective study done at ANMC
40% of patients are treatment candidates 60% are not treatment candidates
(S Livingston et al. Int J Circumpolar Health 2012, 71:18445)
As long as treatment includes interferon, HCV infection will be difficult to treat
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Hepatitis C Treatment 2012Genotype 1
Peginterferon, ribavirin AND a protease inhibitor (telaprevir or boceprevir) 24-48 weeks – depends on response, stage of liver
disease, history of treatment response SVR (Details in later slide) – Boceprevir and Telaprevir -
Not apples to apples comparison
Genotypes 2 & 3 Peginterferon and ribavirin only 24 weeks 68%-79% SVR
Other Genotypes (4,5,6) Peginterferon and ribavirin for 48 weeks Underrepresented in U.S.
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Pre-treatment Screening
Medical/psychiatric history for contraindications
Review ALL medications
EKG (men over 40 & women over 50)
Stress test (all patients with hx of cardiac disease)
Dilated retinal exam recommended
Pre-treatment labs, including HCV RNA, genotype, CBC, PT, CMP, AFP, TSH, uric acid, and pregnancy testing for females of childbearing age.
Consider biopsy - Genotype 1
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Follow Up During Treatment Monitor closely for side effects & tolerability Genotypes 2 & 3, labs at weeks 0 (Start), 1, 2
and 4, then monthly after that unless: Significant anemia Thrombocytopenia Neutropenia
Adjust medication doses (refer to prescribing information) Hgb < 10 (Ribavirin) Platelets < 50 (Peginterferon) ANC < 0.5 (Peginterferon)
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HCV Treatment Medications:
Peginterferon (PegInf) Pegylated interferon
Polyethylene glycol added to interferon Extends half-life of interferon Provides a more constant level in the blood
Given weekly, subcutaneously Pharmacodynamics:
Immunomodulation Increases T cell activity Stimulates B cells for increased antibody
response
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Contraindications to Peginterferon
Known hypersensitivity reactions to alpha interferons Autoimmune hepatitis Hepatic decompensation (Child-Pugh > 6 mono-infection,
≥ 6 for HIV coinfection) Women who are pregnant and men whose female
partners are pregnant Cardiac disease Severe pulmonary disease Bone marrow suppression Autoimmune disorders incl. RA, thyroid disease,
uncontrolled DM, ulcerative colitis
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Use Extreme Caution
Severe depression & serious psychiatric conditions Bipolar depression/Mania Psychosis/Hallucinations Suicidal ideation and past attempts Homicidal ideation or history
Active substance or alcohol abuse Patients who can’t practice birth control
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HCV Treatment Medications:Ribavirin (RBV) Oral antiviral agent Does not cause a reduction in serum HCV
RNA when used alone Enhances the virologic response to
interferon Prevents breakthrough and reduces relapse
rates Important not to miss doses Reduce dose in adverse event rather than
stop dose, if possible
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Contraindications to Ribavirin
Anemia (Hgb <11, Hct <33%)
Renal disease (CrCl < 50)
Unstable coronary artery or cerebrovascular disease
Pregnancy, those contemplating pregnancy (men & women), breastfeeding
Inability to practice birth control (men & women)
Didanosine use (lactic acidosis, hepatic failure)
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Peginterferon & Ribavirin Side Effects
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Baseline Lab Parameters Before Treatment
Mono-infection Plt ≥ 90,000 cells/mm3
or 75,000 cirrhosis ANC ≥ 1500
cells/mm3
Cr ≤ 1.5 ULN TSH and T4 WNL Hgb ≥ 12g/dL women,
13g/dL men
HIV Coinfection Plt ≥ 70,000 cells/mm3
ANC ≥ 1500 cells/mm3
CD4 count ≥ 200 cells/mm3
Cr ≤ 1.5 ULN TSH and T4 WNL Hgb ≥ 11g/dL women,
12g/dL men
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1st Generation Protease Inhibitorsfor Genotype 1-New Std of Care
1st two drugs, telaprevir and boceprevir
approved 2011
Telaprevir – Incivek®
Boceprevir – Victrelis®
Must be used with peginterferon and ribavirin
Cannot be used alone
May shorten treatment to 24-28 weeks
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Protease Inhibitors (PI)Mechanism of Action
NS3/4A protease is necessary for cleavage of the HCV encoded polyprotein into mature proteins
Inhibits HCV NS3/4A protease
This inhibits viral replication in HCV-infected host cells
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The Down Side Increased side effects
Telepavir: Rash (moderate/severe in 56%) , anemia (36%), GI Side Effects (29%)
Boceprevir: Severe anemia requiring drug modification in 39% (EPO)
Many drug interactions including non-prescription meds
Can develop resistance. Must follow futility (stopping) rules
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Drug Contraindications withTelaprevir or Boceprevir
Atorvastatin, lovastatin, simvastatin
Alfuzosin
Rifampin
Cisapride
Ergot derivatives
Midazolam (oral), triazolam
PDE5 Inhibitors (PAH doses)
Pimozide
St. John’s wort
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Potential Significant Drug Interactions Telaprevir, Boceprevir *
Antiarrhythmics ↑Antifungals ↑Anticonvulsants ↑ or ↓-Mycin antibiotics ↑Colchicine ↓Alprazolam ↑Zolpidem ↓Ca++ channel blockers ↑Corticosteroids ↑Bosentan ↑Escitalopram ↓Buprenorphine/naloxone ↑
Tenofovir ↑Cyclosporine ↑Sirolimus ↑Tacrolimus ↑Salmeterol ↑Fluticasone ↑Budesonide ↑Methadone ↓PDE5 Inhibitors for ED ↑ Rifabutin ↑Warfarin ↑ or ↓
* Not all inclusive. Check individual drug interactions before starting treatment.
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Hepatitis C and HIV Coinfection Treatment
Treatment unchanged genotypes 2 through 6
Provisional guidance for genotype 1 and PIs: boceprevir and telaprevir*
No shortened treatment with PIs
More drug interactions
Consult specialist
*Thomas, D. et al. CID 2012(54): 979-983.
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TermsRelapser – HCV RNA undetectable at end
of treatment (EOT) with PegInf/RBV but detectable 24 weeks after treatment
Partial Responder – Greater than 2 log drop at week 12 but not achieving undetectable RNA by week 24 of a prior course of therapy with PegInf/RBV
Null Responder – Less than 2 log reduction in HCV RNA at week 12 of prior course of therapy with PegInf/RBV
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Comparison Boceprevir Telaprevir PegInf/Rib
# of pills 17-18/day(4 Bocep TID)
11-12/day(2 Telap TID w/fat)
5-6 Rib/day
How to take? With food q8h With 20g fat q8h BID with food
New Side Effects Anemia requiring EPO,
Dysgeusia
Rash, GI SEs, Anemia
N/A
How long on this med?
24-44 weeks 12 weeks 48 weeks
Tx Length incl. PegInf/Rib
28, 36 or 48 weeks
24 or 48 weeks 48 weeks
SVR in Tx Naive 63-66% 79% 38%
SVR in Relapsers 70-75% 86% 22%
SVR in Partial Responders
40-52% 59% 7%
SVR in Null Responders
Not studied 32% 5%
SVR in Advanced Fibrosis
41-52% 62% 10-38%
Total Cost 31,680-$58,080 $59,080 $20,000-40,000
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Fatty Foods for Absorption of Telaprevir
½ cup trail mix 2 ounces of cheese ¾ cup regular ice
cream 1 container Total
Classic Fage Fruit yogurt and 1 oz
coconut 2 oz potato chips ½ c or 4oz avocado
15 dark chocolate covered almonds
2 T peanut butter 35 almonds/peanuts ½ cup Agutuk (berries,
seal oil, shortening, sugar)
5 ½ oz cooked king salmon
1 ½ Tablespoon seal oil 3 oz smoked hooligan
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Ribavirin Dose Modification Algorithm for Telaprevir
Test Hgb ≥10 g/dl Weeks0-2-4-8-12*
Test Hgb <10 g/dl <8.5 g/dl
Reduce dose to 600mg/d
Continue at current dose
Discontinue RBV
>2g/dL drop in Hgb during any 4 wk tx pd
Reduce RBV to
600mg/d
Hgb < 12 g/dL after 4
wks at reduced
dose
D/C RBV
*More frequent monitoring may be clinically appropriate
Source: Vertex Incivek® Treatment Management Guide
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Financial Resources for HCV Treatment
Boceprevir (and Pegintron®) www.Merck-CARES.com 1-866-939-4372
Telaprevir www.VertexGPS.com 1-855-837-8394
Peginterferon alfa 2a (Pegasys®) www.genentechaccesssolutions.com 1-800-530-3083
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Response Guided Therapy (RGT) The opportunity to shorten treatment
duration based on HCV RNA decline at specific timepoints during treatment
Key RGT HCV RNA Timepoints:Telaprevir - Weeks 4, 12, 24Boceprevir – Weeks 8, 12, 24
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Interpreting HCV RNA Results Virus must be “not detected” or
“undetectable” to be considered negative for genotype 1 RGT
<43 or <25 IU/ml – Unclear Result should specify:
Detected/Below Level of Quantification (Still detected – Not negative)
Not Detected/Below Level of Detection (Negative result – Proceed with RGT)
Harrington, P., Wen Zeng, L. Naeger. Hepatology, 2012 (online 10/1011)
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Boceprevir Treatment AlgorithmBoceprevir Treatment Duration
Lead-in:Peg/RBV
Wk 8 RNA
Wk 24 RNA
Triple therapy:
Peg/RBV/BOC
Peg/RBV
Total Duratio
n
Treatment-naïve
4 wks4 wks
NegPos
NegNeg
24 wks32 wks
-12 wks
28 wks48 wks
Prior Relapser orPartial Responder
4 wks4 wks
NegPos
NegNeg
32 wks32 wks
-12 wks
36 wks48 wks
Cirrhotics 4 wks Neg 44 wks 48 wks
Null responder
No data
STOPPING RULES/TREATMENT FUTILITY: If HCV RNA ≥100 IU/mL at wk 12, or detectable at any level at wk 24, discontinue all treatment. It isn’t working.
Peg = Peginterferon RBV = Ribavirin BOC = Boceprevir
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Telaprevir Treatment Duration
Wk 4 RNA
Wk 12 RNA
Wk 24RNA
Triple therapy:
Peg/Rib/TPR
Peg/Rib Total Duratio
n
Treatment-naïve or Prior Relapser
NegPos
NegPos
Neg 12 wks12 wks
12 wks36 wks
24 wks48 wks
Prior Partial Responder or Null Responder
Neg/Pos Neg/Pos Neg 12 wks 36 wks 48 wks
Cirrhosis Neg/Pos Neg/Pos Neg 12 wks 36 wks 48 wks
STOPPING RULES/TREATMENT FUTILITY: If >1000 IU/mL at wks 4 or 12, or detectable at any level at wk 24, discontinue all treatment. It isn’t working.
Telaprevir Treatment Algorithm
Peg = Peginterferon RBV = Ribavirin TPR = Telaprevir
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PI Treatment Caution HCV/HIV - provisional guidance HCV/HBV Coinfection – not studied Children – not studied Patients over 65 - not studied sufficiently
(35 subjects in telaprevir study >65 yrs) Cirrhotics – limited study ESRD or patients on hemodialysis – not
studied Solid Organ Transplantation – not studied
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“Now this is not the end. It is not even the beginning of the end. But it is, perhaps, the end of the beginning”
-Winston Churchill
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New Drugs for HCVClass Drug
ExamplesPotency Resistance
BarrierActiveGenotype 1
ActiveGenotype 2 &3
1st Gen PI (NS3/4A)
TelaprevirBoceprevir
Mod. high
Lowest Yes No
2nd Gen PI SimeprevirAsunaprevirGS 9256MK 5172ACH 2684
High Low Yes Low/moderate
Nucleotide Inhibitors
GS 7977 High High Yes Yes
Polymerase Inh/NS5B
TegobuvirABT-072
High Low Yes Yes
NS5A Protease Inhibitors
Daclatasvir High Intermediate Yes ?
Cyclophilin Inhibitors
Alisporivir Yes
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Future Treatment withDirect Acting Antivirals (DAAs)
Interferon-free
Fewer side effects
More drug options
Tailored treatment
Less frequent administration (QD or BID)
Fewer pills (Combining drugs)
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Thank You!
My contact info: [email protected] 907-729-1573
ANTHC Hepatitis Website http://www.anthctoday.org/community/hep/
providerinformation.html