New Treatment Response in People With and Without Cirrhosis From Chronic Hepatitis C

Up to 70 patients with chronic hepatitis C, genotype 1, who were partial or null responders
to optimal therapy with the combination of peginterferon and ribavirin will be enrolled into
this pilot study on the use of asunaprevir and daclatasvir together or in combination with
peginterferon alfa-2a and ribavirin to improve response to antiviral therapy. Two separate
studies will be conducted based upon HCV genotype 1 subtype. For patients with HCV genotype
1b: Will undergo baseline testing for NS5A RAVs known to confer resistance to daclatasvir
(L31/Y93). Subjects who harbor these NS5A resistance associated variants will be excluded
from receiving dual therapy but would be offered quad therapy and managed as a HCV genotype
1a subject. After medical evaluation and liver biopsy, 30 HCV genotype 1b patients will
receive combination therapy with asunaprevir and daclatasvir alone for 24 weeks and undergo
paired liver biopsies, pre-treatment and either at 2 or 4 weeks after starting therapy.
Patients in whom HCV RNA is greater than or equal to LLOQ at 8 weeks will either discontinue
therapy at that point (early stopping rule for futility) or may have rescue therapy
instituted at the discretion of the investigator with a QUAD regimen (asunaprevir and
daclatasvir plus peginterferon and ribavirin) provided they meet pre-specified inclusion
criteria. For patients with HCV genotype 1a: After medical evaluation and liver biopsy 40
(15 with cirrhosis and 15 with Ishak fibrosis 0-2; the remaining 10 slots will be allocated
for individuals who do not meet the histological entry requirement i.e. Ishak 3-4) HCV
genotype 1a patients will be started on combination therapy with asunaprevir, daclatasvir,
peginterferon alfa-2a and ribavirin for 24 weeks. Patients will be randomized to undergo a
second liver biopsy at study week 4 after starting therapy either before or 6 hours after
the next scheduled peginterferon dose to assess intrahepatic interferon stimulated gene
expression. Intrahepatic drug concentrations of asunaprevir and daclatasvir will be measured
as part of an ancillary study. Patients in whom HCV RNA is greater than or euqal to LLOQ at
8 weeks will discontinue therapy (early stopping rule for futility). Routine serum
chemistries, complete blood counts and HCV RNA levels will be monitored more frequently for
the initial 4 days and then at standard intervals during the period of antiviral therapy.
The major endpoints will be changes in interferon stimulated gene and protein expression in
the liver and changes in HCV RNA levels in liver and serum between baseline and 4 weeks.
Secondary endpoints will be rates of sustained virologic response 12 and 24 weeks off
therapy.

-INCLUSION CRITERIA:

INCLUSION CRITERIA FOR BOTH GENOTYPES 1a and 1b:

1. Adults, ages 18 and above

2. Chronic hepatitis C (HCV RNA in serum for more than 6 months)

3. HCV Genotype 1

4. HCV RNA in serum above 10,000 IU/mL

5. Non-response to previous therapy with peginterferon and ribavirin categorized as
null-response as defined by a less than 1 log IU/mL decline in HCV RNA at treatment
week 4 or a less than 2 log IU/mL decline in HCV RNA at treatment week 12; and
partial response as defined by a greater than or equal to 2 log decrease in HCV RNA
at treatment week 12 but continued detection of HCV RNA at treatment week 24

6. No contraindications to agents being used (asunaprevir, daclatasvir, peginterferon
and ribavirin).

7. No evidence or history of hepatic decompensation.

8. Females of childbearing potential must have a negative serum or urine pregnancy test
result (minimum sensitivity 25 IU/L or equivalent units of HCG) within 24 hours
before the first dose of study drug.

9. Women of childbearing potential (WOCBP) and men must use highly effective methods of
birth control to minimize the risk of pregnancy. WOCBP must follow instructions for
birth control for the entire duration of the study including a minimum of 24 weeks
after the last dose of P/R. Birth control requirements are or WOCBP and men who are
sexually active with WOCBP

10. Women must not be breastfeeding

11. Fully informed, written consent to the study including repeat liver biopsy.

ADDITIONAL INCLUSION CRITERIA FOR GENOTYPE 1a

1) Liver biopsy showing Ishak stages 0-2 or 5-6 within 12 weeks of initiating therapy OR a
prior biopsy performed within 96 weeks of screening visit WITH saved tissue. Up to 10
subjects who do not fulfill the entry histologic criteria will be allowed to participate
in the trial at the discretion of the investigator.

ADDITIONAL INCLUSION CRITERIA FOR GENOTYPE 1b

1. Baseline sequence analysis of the NS5A region to exclude presence of mutations known
to confer resistance to daclatasvir.

INCLUSION CRITERIA FOR GT 1b SUBJECTS WHO RECEIVE RESCUE THERAPY AT THE DISCREATION OF THE
INVESTIGATOR (THESE CRITERIA MUST BE ASSESSED PRIOR TO INITIATIONOF PEG INFa/RBV THERAPY):

Important: In addition to the Inclusion Criteria listed above, the following

Inclusion Criteria apply to all Rescue Subjects:

a) Subject met a definition of virologic breakthrough or treatment futility, defined

as:

i) Any confirmed > 1 log10 increase in HCV RNA from nadir, OR;

ii) Any confirmed HCV RNA greater than or equal to Lower Limit of quantification (LLOQ)
after confirmed HCV RNA < LLOQ Target Not Detected while on treatment, OR;

iii) Any confirmed HCV RNA greater than or equal to LLOQ at Week 8. Measurements should be
confirmed within 2 weeks of the Week 8 result;

b) HCV RNA < 400,000 IU/mL at the last assessment; This cut-off was chosen because it is
felt that peginterferon and ribavirin would be ineffective at higher viral loads in prior
non-responders to peginterferon and ribavirin with viral breakthrough.

c) Women of childbearing potential (WOCBP)1 and men must use highly effective methods of
birth control to minimize the risk of pregnancy. WOCBP must follow instructions for birth
control for the entire duration of the study including a minimum of 24 weeks after the
last dose of P/R. Birth control requirements are or WOCBP (see Section C.5 for the
definition of WOCBP) and men who are sexually active with WOCBP;

i) Two (2) forms of birth control are required from time of screening throughout the
duration of the on-treatment study period and for at least 24 weeks after the last dose of
RBV (or the duration specified by the country-specific RBV label, whichever is longer), in
such a manner that the risk of pregnancy is minimized. Examples of highly effective birth
control include:

-condom with spermicide;

-diaphragm and spermacide;

-cervical cap and spermacide

- female condom;

- intrauterine devices (IUDs);

Oral contraceptive pills (OCPs) may be used in this study but cannot be considered as an
effective form of contraception for WOCBP subjects.

ii) Exceptions include:

1. WOCBP who are not heterosexually active or who have male partners who have been
vasectomized for a minimum of 6 months with a history of confirmed azoospermia;

2. Sexually active men who are vasectomized for a minimum of 6 months with a history of
confirmed azoospermia.

d) WOCBP must have a negative serum or urine pregnancy test [minimum sensitivity 25
IU/L or equivalent units of human chorionic gonadotropin (HCG)] within 24 hours prior
to the start of P/R. Female subjects must agree to the pregnancy testing requirements
of this protocol;

e) Women must not be breastfeeding;

f) Male Subjects: Requirements (based on RBV label):

i) Male subjects (unless vasectomized for at least 6 months with a history of
confirmed azoospermia) with female partners who are WOCBP must agree to inform their
female partners of the protocol-specified effective birth control methods requirement
and pregnancy testing recommendations during treatment and post-treatment (i.e., two
forms of effective methods of birth control and monthly pregnancy testing while the
subject is enrolled in the study and 6 months following discontinuation of RBV [or
for the post-treatment duration specified in the country-specific RBV label]), and
agree to adhere to these recommendations both on-treatment and during the
post-treatment follow-up period;

ii) Male subjects must confirm that their female sexual partners are not pregnant at the
time of screening.

EXCLUSION CRITERIA:

Exclusion Criteria for Genotypes 1b:

1. Medical History and Concurrent Diseases

1. Liver or any other organ transplant (including hematopoietic stem cell
transplants) other than cornea and hair;

2. Current or known history of cancer (except in situ carcinoma of the cervix or
adequately treated basal or squamous cell carcinoma of the skin) within 5 years
prior to enrollment

3. Documented or suspected HCC, as evidenced by previously obtained imaging studies
or liver biopsy (or on a screening imaging study/liver biopsy if this was
performed)

4. Evidence of decompensated liver disease including, but not limited to,
radiologic criteria, a history or presence of ascites, bleeding varices, or
hepatic encephalopathy

5. Evidence of a medical condition contributing to chronic liver disease other than
HCV (such as, but not limited to: hemochromatosis, autoimmune hepatitis,
metabolic liver disease, alcoholic liver disease, toxin exposures)

6. History of chronic hepatitis B virus (HBV) as documented by HBV serologies (eg,
HBsAg-seropositive). Subjects with resolved HBV infection may participate (eg,
HBsAb-seropositive with concurrent HBsAg-seronegative)

7. Any gastrointestinal disease or surgical procedure that may impact the
absorption of study drug. (Subjects who have had cholecystectomy are permitted
to enter the study)

8. History of HIV infection

9. Hemophilia

10. Uncontrolled diabetes (any subject with a confirmed screening HgA1c greater than
or equal to 8.5 must be excluded)

11. Confirmed, uncontrolled hypertension (any screening systolic blood pressure
greater than or equal to 160 mmHg or diastolic blood pressure greater than or
equal to 100 mmHg should be excluded unless discussed with the central medical
monitor)

12. Any other medical and/or social reason, including active substance abuse as
defined by DSM-IV, Diagnostic Criteria for Drug and Alcohol Abuse, which in the
opinion of the investigator would make the candidate inappropriate for
participation in this study

13. History of severe psychiatric disorders including but not limited to,
schizophrenia, psychosis, bipolar disorder, post-traumatic stress disorder,
mania, etc.

14. Inability to tolerate oral medication;

15. Poor venous access

2. Physical and Laboratory Test Findings

Note: Growth factors must not be used to achieve eligibility criteria.

1. ALT greater than or equal to 10 times ULN

2. Total bilirubin greater than or equal to 34 micromoles per liter (greater than or
equal to 2 mg/dL) unless the subject has documented history of Gilbert s disease

3. Albumin < 3.5 g/dL (35 g/L)

4. Creatinine clearance (CrCl) less than or equal to 50 ml/min (as estimated by
Cockcroft and Gault)

5. Platelets < 50 times 10(9) cells/L

6. ANC < 0.5 times 10(9) cells/L

7. Hemoglobin < 8.5 g/dL

8. INR greater than or equal to 1.7

9. Alpha-fetoprotein (AFP):

i) AFP > 100 ng/mL OR

ii) AFP greater than or equal to 50 ng/mL and less than or equal 100 ng/mL requires a
liver ultrasound and subjects with findings suspicious for HCC are excluded

j) QTcF or QTcB > 500 msec

3. Allergies and Adverse Drug Reaction

a) History of hypersensitivity to drugs with a similar biochemical structure to
asunaprevir

or daclatasvir.

4. Prohibited Treatments and /or Therapies

1. Exposure to any investigational drug or placebo within 4 weeks of study drug
administration;

2. Prior exposure to any HCV DAA;

3. Prior exposure to pegIFN or RBV within 12 weeks prior to screening;

4. Subjects receiving all tricyclic anti-depressants (TCAs) including amitriptyline,
clomipramine, desiprmine, dosepin, imipramine, nortriptyline, protriptyline; OR
selective serotonin reuptake inhibitors (SSRIs) including fluoxetine, fluvoxamine,
paroxetine and

sertraline; OR additional agents including venlafaxine, duloxetine, aripiprazole and
mirtazapine within 2 weeks prior to Day 1; (subjects may switch to non-prohibited
antidepressant therapies (eg citalopram, escitalopram and bupropion) within 2 weeks prior
to

Day 1). The study eligibility of subjects on any anti-depressant not listed above, may be
considered after a consultation with the central medical monitor, prior to Day 1;

5. Sex and Reproductive Status

1. Sexually active men whose partners are pregnant at screening are excluded from this
study

6. OTHER EXCLUSION CRITERIA

a) Prisoners or subjects who are involuntarily incarcerated

b) Subjects who are compulsorily detained for treatment of either a psychiatric or
physical (e.g., infectious disease) illness

C.5 Exclusion Criteria for Gt 1a subjects and 1b subjects who receive rescue therapy at
discretion of the investigator (Prior to initiation of PegIFN /ribavirin therapy):

Important: In addition to the Exclusion Criteria listed above WITH THE EXCEPTION OF THE
LABORATORY TESTS INDICATED IN SECTION C.4.2 A-H, the following

Exclusion Criteria apply to all Gt 1a and rescue subjects:

a) Severe psychiatric disease that would prohibit use of peg-IFN -2a as judged by the
investigator including but not limited to:

i) Moderate or severe depression; Beck Depression Score greater than or equal to 15 during
screening

ii) History of depression associated with hospitalized for depression,

electroconvulsive therapy, or depression resulting in a prolonged absence from work and/or
significant disruptions from daily functions;

iii) Suicidal or homicidal ideation and/or attempt;

iv) History of severe psychiatric disorders including but not limited to,

schizophrenia, psychosis, bipolar disorder, post-traumatic stress disorder, mania, etc.;

b) History of hemoglobinopathies (e.g., thalassemia major or sickle cell anemia),
diagnoses associated with an increased baseline risk for anemia (e.g., spherocytosis),
hemolytic anemia, or diseases in which anemia would be medically problematic, or
hemophilia;

c) Pre-existing ophthalmologic disorders considered clinically significant on eye exam,
including retinal, examination. Note: all subjects with a history of diabetes or
hypertension must have a documented eye exam within 12 months prior to initiation of P/R;

d) Thyroid-stimulating hormone (TSH) < 0.8 times LLN or > 1.2 times ULN of the laboratory
reference range, unless

i) The subject is clinically euthyroid as determined by the investigator, AND

ii) Free T4 is greater than or equal to 0.8 times LLN and less than or equal to 1.2 times
ULN

e) History of chronic pulmonary disease associated with functional limitation such as
clinically significant chronic obstructive pulmonary disease, interstitial lung disease,
pulmonary fibrosis, sarcoidois, etc;

f) History of cardiomyopathy, coronary artery disease (including angina), interventional
procedure for coronary artery disease (including angioplasty, stent procedure, or cardiac
bypass surgery), ventricular arrhythmia, congestive heart failure, pulmonary hypertension,
cardiomyopathy, or other clinically significant cardiac disease;

g) Historical or current ECG findings indicative of cardiovascular instability, including
but not limited to evidence of significant myocardial ischemia, unstable re-entry
phenomena, other significant dysarrhythmias and/or uncontrolled hypertension;

h) Immunologically-mediated disease (eg, inflammatory bowel disease [Crohn s disease,
ulcerative colitis], celiac disease, rheumatoid arthritis, idiopathic thrombocytopenic
purpura, systemic lupus erythematosus, autoimmune hemolytic anemia, scleroderma,

sarcoidosis, severe psoriasis requiring oral or injected treatment, or symptomatic thyroid
disorder).

i) Any known contraindication to peg-IFN -2a or ribavirin, not otherwise specified.

j) Alanine aminotransferase (ALT) greater than 10 times ULN;

k) Total Bilirubin greater than or equal to 34 mol/L (greater than or equal to 2 mg/dL),
unless subject has a documented history of Gilbert s disease;

l) INR greater than or equal to 1.7;

m) Albumin < 3.5 g/dL (35 g/L);

n) Platelets < 70 times 10(9) cells/L;

o) ANC < 1,500 cells/mm3 (confirmed ANC < 1,200 cells/mm3 for Black/African-Americans);

p) Hemoglobin < 12 g/dL (120 g/L) for women and < 13 g/dL (130 g/L) for men;

q) Creatinine Clearance (CrCl) less than or equal to 50 mL/min (as estimated by Cockcroft
and Gault);

r) History of hypersensitivity to drugs with similar biochemical structure to pegIFN alpha
or ribavirin

s) QTcF or QTcB > 500 msec;