New Data from Investigational Study of LENVIMA® (lenvatinib) and KEYTRUDA® (pembrolizumab) Combination in Three Different Tumor Types Presented at the Society for Immunotherapy of Cancer’s 33rd Annual Meeting

TOKYO KENILWORTH, N.J.–(BUSINESS WIRE)–Eisai Co., Ltd. (Headquarters: Tokyo, CEO: Haruo Naito, “Eisai”) and
Merck (NYSE:MRK), known as MSD outside the United States and Canada,
today announced results from presentations of new data and analyses of
LENVIMA® (lenvatinib), an orally available kinase inhibitor
discovered by Eisai, in combination with Merck’s anti-PD-1 therapy
KEYTRUDA® (pembrolizumab) in three different tumor types –
metastatic non-small cell lung cancer (NSCLC) (Abstract #11147),
metastatic melanoma (Abstract #11187) and metastatic urothelial
carcinoma (Abstract #11201).

These data from the Study 111/KEYNOTE-146 Phase 1b/2 trial will be
presented at the 33rd Annual Meeting of the Society for
Immunotherapy of Cancer (SITC) in Washington, D.C. from November 9-11.
In the interim analyses of the studies across three tumor types, the
LENVIMA and KEYTRUDA combination demonstrated encouraging anti-tumor
activity. These data support further evaluation of the combination.
LENVIMA and KEYTRUDA are not approved for use in combination in any
cancer types today.

We are increasingly confident that these interim analyses of new
clinical trial data on the combination of LENVIMA and KEYTRUDA in
non-small cell lung cancer, melanoma and urothelial cancer continue to
verify the potential of this combination,” said Dr. Takashi Owa, Vice
President and Chief Medicine Creation Officer, Oncology Business Group
at Eisai. “Through our collaboration with Merck, we are doing our utmost
to be able to provide this combination to patients in need of new
treatment options as soon as possible.”

These early promising data being presented support the clinical
strategy behind our study of KEYTRUDA in combination with LENVIMA across
a range of different cancers,” said Dr. Jonathan Cheng, Vice President,
Oncology Clinical Research, Merck Research Laboratories. “We look
forward to continuing our broad clinical research effort in
collaboration with Eisai to evaluate these two therapies in combination,
with the goal of improving treatment outcomes for people living with
cancer.”

Trial Design and New Data for Study 111/KEYNOTE-146

Study 111/KEYNOTE-146 is a multi-center, open-label, single-arm, Phase
1b/2 basket trial (ClinicalTrials.gov, NCT02501096) evaluating the
combination of LENVIMA (20 mg/day) with KEYTRUDA (200 mg intravenously
every three weeks) in patients with selected solid tumors (metastatic
endometrial cancer, metastatic head and neck cancer, metastatic
melanoma, metastatic NSCLC, metastatic renal cell carcinoma and
metastatic urothelial carcinoma). Patients were not preselected based on
PD-L1 tumor expression status. The primary endpoint of the Phase 1b
study was to determine the maximum tolerated dose of LENVIMA and
KEYTRUDA in combination. The primary endpoint of the Phase 2 portion is
investigator-assessed objective response rate (ORR) at week 24 based on
immune-related RECIST (irRECIST). The secondary efficacy endpoints
included ORR, progression-free survival (PFS) and duration of response
(DOR) for patients with complete or partial responses. Data from Study
111/KEYNOTE-146 are being presented at SITC’s 33rd Annual
Meeting from the metastatic NSCLC, metastatic melanoma and metastatic
urothelial carcinoma cohorts.

Phase 1b/2 trial of lenvatinib in combination with pembrolizumab
in patients with NSCLC (Abstract #11147/Poster #P392)

As of data cutoff on March 1, 2018, 21 patients with metastatic NSCLC
who either had no prior therapy or had received up to two prior lines of
therapy were enrolled in this Phase 2 cohort. The primary endpoint of
ORR at week 24 per irRECIST was 33.3% (95% CI: 14.6-57.0). For secondary
endpoints, median PFS per irRECIST was 5.9 months (95% CI: 2.3-13.8),
and the PFS rate at 12 months per irRECIST was 29.0% (95% CI:
10.2-51.0). Median DOR was 10.9 months (95% CI: 2.4-not estimable).
Grade 3 treatment-related adverse events (TRAEs) occurred in 10 patients
(48%), and Grade 4 TRAEs occurred in one patient (5%). The most common
TRAEs (any grade) ≥30% were decreased appetite (67%), fatigue (62%),
hypothyroidism (43%), diarrhea (43%), proteinuria (43%), arthralgia
(33%) and hypertension (33%). There was one treatment-related death.

Phase 1b/2 trial of lenvatinib in combination with pembrolizumab
in patients with advanced melanoma (Abstract #11187/Poster #P391)

As of March 1, 2018, 21 patients with metastatic melanoma who either had
no prior therapy or had received up to two prior lines of therapy were
enrolled in this cohort. The primary endpoint of ORR at week 24 per
irRECIST was 47.6% (95% CI: 25.7-70.2). For secondary endpoints, median
PFS was 5.5 months (95% CI: 2.6-15.8), and the PFS rate at 12 months was
34.7% (95% CI: 14.5-56.0). In addition, median DOR was 12.5 months (95%
CI: 2.7-not estimable). All patients experienced at least one TRAE.
Grade 3 or 4 TRAEs occurred in 14 patients (67%). The most common TRAEs
(any grade) ≥30% were fatigue (52%), decreased appetite (48%), diarrhea
(48%), hypertension (48%), dysphonia (43%), nausea (43%), arthralgia
(33%) and proteinuria (33%). There were no treatment-related deaths.

Phase 1b/2 trial of lenvatinib in combination with pembrolizumab
in patients with urothelial cancer (Abstract #11201/Poster #P393)

As of March 1, 2018, 20 patients with metastatic urothelial cancer who
either had no prior therapy or had received up to two prior lines of
therapy were enrolled in this cohort. The primary endpoint of ORR at
week 24 per irRECIST was 25% (95% CI: 9-49). For secondary endpoints,
median PFS was 5.4 months (95% CI: 1.3-not estimable). Eighteen patients
(90%) experienced TRAEs. Grade 3 or 4 TRAEs occurred in 10 patients
(50%). The most common TRAEs (any grade) ≥30% were proteinuria (45%),
diarrhea (40%), hypertension (35%), fatigue (30%) and hypothyroidism
(30%). There was one treatment-related death.

About LENVIMA® (lenvatinib) capsules 10 mg
and 4 mg

LENVIMA® (lenvatinib) is a kinase inhibitor that is indicated
in the U.S.:

  • For the treatment of patients with locally recurrent or metastatic,
    progressive radioactive iodine-refractory differentiated thyroid
    cancer (DTC)
  • In combination with everolimus, for the treatment of patients with
    advanced renal cell carcinoma (RCC) following one prior
    anti-angiogenic therapy
  • For the first-line treatment of patients with unresectable
    hepatocellular carcinoma (HCC)

LENVIMA, discovered and developed by Eisai, is a kinase inhibitor that
inhibits the kinase activities of vascular endothelial growth factor
(VEGF) receptors VEGFR1 (FLT1), VEGFR2 (KDR), and VEGFR3 (FLT4). LENVIMA
inhibits other kinases that have been implicated in pathogenic
angiogenesis, tumor growth, and cancer progression in addition to their
normal cellular functions, including fibroblast growth factor (FGF)
receptors FGFR1-4; the platelet derived growth factor receptor alpha
(PDGFRα), KIT, and RET. The combination of lenvatinib and everolimus
showed increased anti-angiogenic and anti-tumor activity as demonstrated
by decreased human endothelial cell proliferation, tube formation, and
VEGF signaling in vitro and tumor volume in mouse xenograft
models of human renal cell cancer greater than each drug alone.
Lenvatinib also exhibited antiproliferative activity in hepatocellular
carcinoma cell lines dependent on activated FGFR signaling with a
concurrent inhibition of FGF-receptor substrate 2α (FRS2α)
phosphorylation.

Important Safety Information

Warnings and Precautions

Hypertension. In DTC, hypertension occurred in 73% of patients on
LENVIMA (44% grade 3-4). In RCC, hypertension occurred in 42% of
patients on LENVIMA + everolimus (13% grade 3). Systolic blood pressure
≥160 mmHg occurred in 29% of patients, and 21% had diastolic blood
pressure ≥100 mmHg. In HCC, hypertension occurred in 45% of
LENVIMA-treated patients (24% grade 3). Grade 4 hypertension was not
reported in HCC.

Serious complications of poorly controlled hypertension have been
reported. Control blood pressure prior to initiation. Monitor blood
pressure after 1 week, then every 2 weeks for the first 2 months, and
then at least monthly thereafter during treatment. Withhold and resume
at reduced dose when hypertension is controlled or permanently
discontinue based on severity.

Cardiac Dysfunction. Serious and fatal cardiac dysfunction can
occur with LENVIMA. Across clinical trials in 799 patients with DTC,
RCC, and HCC, grade 3 or higher cardiac dysfunction occurred in 3% of
LENVIMA-treated patients. Monitor for clinical symptoms or signs of
cardiac dysfunction. Withhold and resume at reduced dose upon recovery
or permanently discontinue based on severity.

Arterial Thromboembolic Events. Among patients receiving LENVIMA
or LENVIMA + everolimus, arterial thromboembolic events of any severity
occurred in 2% of patients in RCC and HCC and 5% in DTC. Grade 3-5
arterial thromboembolic events ranged from 2% to 3% across all clinical
trials.

Permanently discontinue following an arterial thrombotic event. The
safety of resuming after an arterial thromboembolic event has not been
established and LENVIMA has not been studied in patients who have had an
arterial thromboembolic event within the previous 6 months.

Hepatotoxicity. Across clinical studies enrolling 1,327
LENVIMA-treated patients with malignancies other than HCC, serious
hepatic adverse reactions occurred in 1.4% of patients. Fatal events,
including hepatic failure, acute hepatitis and hepatorenal syndrome,
occurred in 0.5% of patients. In HCC, hepatic encephalopathy occurred in
8% of LENVIMA-treated patients (5% grade 3-5). Grade 3-5 hepatic failure
occurred in 3% of LENVIMA-treated patients. 2% of patients discontinued
LENVIMA due to hepatic encephalopathy and 1% discontinued due to hepatic
failure.

Monitor liver function prior to initiation, then every 2 weeks for the
first 2 months, and at least monthly thereafter during treatment.
Monitor patients with HCC closely for signs of hepatic failure,
including hepatic encephalopathy. Withhold and resume at reduced dose
upon recovery or permanently discontinue based on severity.

Renal Failure or Impairment. Serious including fatal renal
failure or impairment can occur with LENVIMA. Renal impairment was
reported in 14% and 7% of LENVIMA-treated patients in DTC and HCC,
respectively. Grade 3-5 renal failure or impairment occurred in 3% of
patients with DTC and 2% of patients with HCC, including 1 fatal event
in each study. In RCC, renal impairment or renal failure was reported in
18% of LENVIMA + everolimus–treated patients (10% grade 3).

Initiate prompt management of diarrhea or dehydration/hypovolemia.
Withhold and resume at reduced dose upon recovery or permanently
discontinue for renal failure or impairment based on severity.

Proteinuria. In DTC and HCC, proteinuria was reported in 34% and
26% of LENVIMA-treated patients, respectively. Grade 3 proteinuria
occurred in 11% and 6% in DTC and HCC, respectively. In RCC, proteinuria
occurred in 31% of patients receiving LENVIMA + everolimus (8% grade 3).

Monitor for proteinuria prior to initiation and periodically during
treatment. If urine dipstick proteinuria ≥2+ is detected, obtain a
24-hour urine protein. Withhold and resume at reduced dose upon recovery
or permanently discontinue based on severity.

Diarrhea. Of the 737 LENVIMA-treated patients in DTC and HCC,
diarrhea occurred in 49% (6% grade 3). In RCC, diarrhea occurred in 81%
of LENVIMA + everolimus–treated patients (19% grade 3). Diarrhea was the
most frequent cause of dose interruption/reduction, and diarrhea
recurred despite dose reduction.

Promptly initiate management of diarrhea. Withhold and resume at reduced
dose upon recovery or permanently discontinue based on severity.

Fistula Formation and Gastrointestinal Perforation. Of the 799
patients treated with LENVIMA or LENVIMA + everolimus in DTC, RCC, and
HCC, fistula or gastrointestinal perforation occurred in 2%. Fistulas
and gastrointestinal perforations have also been reported in other
lenvatinib clinical trials and in post-marketing experience.
Pneumothorax has been reported with and without clear evidence of a
bronchopleural fistula. Some reports of gastrointestinal perforation,
fistula, and pneumothorax occurred in association with tumor regression
or necrosis. In most cases of fistula formation or gastrointestinal
perforation, risk factors such as prior surgery or radiotherapy were
present.

Permanently discontinue in patients who develop gastrointestinal
perforation of any severity or grade 3-4 fistula.

QT Interval Prolongation. In DTC, QT/QTc interval prolongation
occurred in 9% of LENVIMA-treated patients and QT interval prolongation
of 500 ms occurred in 2%. In RCC, QTc interval increases of 60 ms
occurred in 11% of patients receiving LENVIMA + everolimus and QTc
interval 500 ms occurred in 6%. In HCC, QTc interval increases of 60
ms occurred in 8% of LENVIMA-treated patients and QTc interval 500 ms
occurred in 2%.

Monitor and correct electrolyte abnormalities at baseline and
periodically during treatment. Monitor electrocardiograms in patients
with congenital long QT syndrome, congestive heart failure,
bradyarrhythmias, or those who are taking drugs known to prolong the QT
interval, including Class Ia and III antiarrhythmics. Withhold and
resume at reduced dose upon recovery based on severity.

Hypocalcemia. In DTC, grade 3-4 hypocalcemia occurred in 9% of
LENVIMA-treated patients. In 65% of cases, hypocalcemia improved or
resolved following calcium supplementation with or without dose
interruption or dose reduction. In RCC, grade 3-4 hypocalcemia occurred
in 6% of LENVIMA + everolimus–treated patients. In HCC, grade 3
hypocalcemia occurred in 0.8% of LENVIMA-treated patients.

Monitor blood calcium levels at least monthly and replace calcium as
necessary during treatment. Withhold and resume at reduced dose upon
recovery or permanently discontinue depending on severity.

Reversible Posterior Leukoencephalopathy Syndrome. Across
clinical studies of 1,823 patients who received LENVIMA as a single
agent, RPLS occurred in 0.3%. Confirm diagnosis of RPLS with MRI.
Withhold and resume at reduced dose upon recovery or permanently
discontinue depending on severity and persistence of neurologic symptoms.

Hemorrhagic Events. Serious including fatal hemorrhagic events
can occur with LENVIMA. In DTC, RCC, and HCC clinical trials,
hemorrhagic events, of any grade, occurred in 29% of the 799 patients
treated with LENVIMA as a single agent or in combination with
everolimus. The most frequently reported hemorrhagic events (all grades
and occurring in at least 5% of patients) were epistaxis and hematuria.
In DTC, grade 3-5 hemorrhage occurred in 2% of LENVIMA-treated patients,
including 1 fatal intracranial hemorrhage among 16 patients who received
LENVIMA and had CNS metastases at baseline. In RCC, grade 3-5 hemorrhage
occurred in 8% of LENVIMA + everolimus–treated patients, including 1
fatal cerebral hemorrhage. In HCC, grade 3-5 hemorrhage occurred in 5%
of LENVIMA-treated patients, including 7 fatal hemorrhagic events.

Serious tumor-related bleeds, including fatal hemorrhagic events,
occurred in LENVIMA-treated patients in clinical trials and in the
postmarketing setting. In postmarketing surveillance, serious and fatal
carotid artery hemorrhages were seen more frequently in patients with
anaplastic thyroid carcinoma (ATC) than other tumors. Safety and
effectiveness of LENVIMA in patients with ATC have not been demonstrated
in clinical trials.

Consider the risk of severe or fatal hemorrhage associated with tumor
invasion or infiltration of major blood vessels (eg, carotid artery).
Withhold and resume at reduced dose upon recovery or permanently
discontinue based on severity.

Impairment of Thyroid Stimulating Hormone Suppression/Thyroid
Dysfunction.
LENVIMA impairs exogenous thyroid suppression. In DTC,
88% of patients had baseline thyroid stimulating hormone (TSH) level
≤0.5 mU/L. In patients with normal TSH at baseline, elevation of TSH
level 0.5 mU/L was observed post baseline in 57% of LENVIMA-treated
patients. In RCC and HCC, grade 1 or 2 hypothyroidism occurred in 24% of
LENVIMA + everolimus–treated patients and 21% of LENVIMA-treated
patients, respectively. In patients with normal or low TSH at baseline,
elevation of TSH was observed post baseline in 70% of LENVIMA-treated
patients in HCC and 60% of LENVIMA + everolimus–treated patients in RCC.

Monitor thyroid function prior to initiation and at least monthly during
treatment. Treat hypothyroidism according to standard medical practice.

Wound Healing Complications. Wound healing complications,
including fistula formation and wound dehiscence, can occur with
LENVIMA. Withhold for at least 6 days prior to scheduled surgery. Resume
after surgery based on clinical judgment of adequate wound healing.
Permanently discontinue in patients with wound healing complications.

Embryo-fetal Toxicity. Based on its mechanism of action and data
from animal reproduction studies, LENVIMA can cause fetal harm when
administered to pregnant women. In animal reproduction studies, oral
administration of lenvatinib during organogenesis at doses below the
recommended clinical doses resulted in embryotoxicity, fetotoxicity, and
teratogenicity in rats and rabbits. Advise pregnant women of the
potential risk to a fetus; and advise females of reproductive potential
to use effective contraception during treatment with LENVIMA and for at
least 30 days after the last dose.

Adverse Reactions

In DTC, the most common adverse reactions (≥30%) observed in
LENVIMA-treated patients were hypertension (73%), fatigue (67%),
diarrhea (67%), arthralgia/myalgia (62%), decreased appetite (54%),
decreased weight (51%), nausea (47%), stomatitis (41%), headache (38%),
vomiting (36%), proteinuria (34%), palmar-plantar erythrodysesthesia
syndrome (32%), abdominal pain (31%), and dysphonia (31%). The most
common serious adverse reactions (≥2%) were pneumonia (4%), hypertension
(3%), and dehydration (3%). Adverse reactions led to dose reductions in
68% of LENVIMA-treated patients; 18% discontinued LENVIMA. The most
common adverse reactions (≥10%) resulting in dose reductions were
hypertension (13%), proteinuria (11%), decreased appetite (10%), and
diarrhea (10%); the most common adverse reactions (≥1%) resulting in
discontinuation of LENVIMA were hypertension (1%) and asthenia (1%).

In RCC, the most common adverse reactions (≥30%) observed in LENVIMA +
everolimus–treated patients were diarrhea (81%), fatigue (73%),
arthralgia/myalgia (55%), decreased appetite (53%), vomiting (48%),
nausea (45%), stomatitis (44%), hypertension (42%), peripheral edema
(42%), cough (37%), abdominal pain (37%), dyspnea (35%), rash (35%),
decreased weight (34%), hemorrhagic events (32%), and proteinuria (31%).
The most common serious adverse reactions (≥5%) were renal failure
(11%), dehydration (10%), anemia (6%), thrombocytopenia (5%), diarrhea
(5%), vomiting (5%), and dyspnea (5%). Adverse reactions led to dose
reductions or interruption in 89% of patients. The most common adverse
reactions (≥5%) resulting in dose reductions were diarrhea (21%),
fatigue (8%), thrombocytopenia (6%), vomiting (6%), nausea (5%), and
proteinuria (5%). Treatment discontinuation due to an adverse reaction
occurred in 29% of patients.

In HCC, the most common adverse reactions (≥20%) observed in
LENVIMA-treated patients were hypertension (45%), fatigue (44%),
diarrhea (39%), decreased appetite (34%), arthralgia/myalgia (31%),
decreased weight (31%), abdominal pain (30%), palmar-plantar
erythrodysesthesia syndrome (27%), proteinuria (26%), dysphonia (24%),
hemorrhagic events (23%), hypothyroidism (21%), and nausea (20%). The
most common serious adverse reactions (≥2%) were hepatic encephalopathy
(5%), hepatic failure (3%), ascites (3%), and decreased appetite (2%).
Adverse reactions led to dose reductions or interruption in 62% of
patients. The most common adverse reactions (≥5%) resulting in dose
reductions were fatigue (9%), decreased appetite (8%), diarrhea (8%),
proteinuria (7%), hypertension (6%), and palmar-plantar
erythrodysesthesia syndrome (5%). Treatment discontinuation due to an
adverse reaction occurred in 20% of patients. The most common adverse
reactions (≥1%) resulting in discontinuation of LENVIMA were fatigue
(1%), hepatic encephalopathy (2%), hyperbilirubinemia (1%), and hepatic
failure (1%).

Use in Specific Populations

Because of the potential for serious adverse reactions in breastfed
infants, advise women to discontinue breastfeeding during treatment and
for at least 1 week after last dose. LENVIMA may impair fertility in
males and females of reproductive potential.

No dose adjustment is recommended for patients with mild (CLcr 60-89
mL/min) or moderate (CLcr 30-59 mL/min) renal impairment. LENVIMA
concentrations may increase in patients with DTC or RCC and severe (CLcr
15-29 mL/min) renal impairment. Reduce the dose for patients with RCC or
DTC and severe renal impairment. There is no recommended dose for
patients with HCC and severe renal impairment. LENVIMA has not been
studied in patients with end stage renal disease.

No dose adjustment is recommended for patients with HCC and mild hepatic
impairment (Child-Pugh A). There is no recommended dose for patients
with HCC with moderate (Child-Pugh B) or severe (Child-Pugh C) hepatic
impairment.

No dose adjustment is recommended for patients with DTC or RCC and mild
or moderate hepatic impairment. LENVIMA concentrations may increase in
patients with DTC or RCC and severe hepatic impairment. Reduce the dose
for patients with DTC or RCC and severe hepatic impairment.

About KEYTRUDA® (pembrolizumab) Injection
100 mg

KEYTRUDA is an anti-PD-1 therapy that works by increasing the ability of
the body’s immune system to help detect and fight tumor cells. KEYTRUDA
is a humanized monoclonal antibody that blocks the interaction between
PD-1 and its ligands, PD-L1 and PD-L2, thereby activating T lymphocytes
which may affect both tumor cells and healthy cells.

Merck has the industry’s largest immuno-oncology clinical research
program. There are currently more than 850 trials studying KEYTRUDA
across a wide variety of cancers and treatment settings. The KEYTRUDA
clinical program seeks to understand the role of KEYTRUDA across cancers
and the factors that may predict a patient’s likelihood of benefiting
from treatment with KEYTRUDA, including exploring several different
biomarkers.

KEYTRUDA® (pembrolizumab) Indications and
Dosing

Melanoma

KEYTRUDA is indicated for the treatment of patients with unresectable or
metastatic melanoma at a fixed dose of 200 mg every three weeks until
disease progression or unacceptable toxicity.

Lung Cancer

KEYTRUDA, in combination with pemetrexed and platinum chemotherapy, is
indicated for the first-line treatment of patients with metastatic
nonsquamous non-small cell lung cancer (NSCLC), with no EGFR or ALK
genomic tumor aberrations.

KEYTRUDA, in combination with carboplatin and either paclitaxel or
nab-paclitaxel, is indicated for the first-line treatment of patients
with metastatic squamous NSCLC.

KEYTRUDA, as a single agent, is indicated for the first-line treatment
of patients with metastatic non-small cell lung cancer (NSCLC) whose
tumors have high PD-L1 expression [Tumor Proportion Score (TPS) ≥50%] as
determined by an FDA-approved test, with no EGFR or ALK genomic
tumor aberrations.

KEYTRUDA, as a single agent, is indicated for the treatment of patients
with metastatic NSCLC whose tumors express PD-L1 (TPS ≥1%) as determined
by an FDA-approved test, with disease progression on or after
platinum-containing chemotherapy. Patients with EGFR or ALK genomic
tumor aberrations should have disease progression on FDA-approved
therapy for these aberrations prior to receiving KEYTRUDA.

In metastatic NSCLC, KEYTRUDA is administered at a fixed dose of 200 mg
every three weeks until disease progression, unacceptable toxicity, or
up to 24 months in patients without disease progression.

When administering KEYTRUDA in combination with chemotherapy, KEYTRUDA
should be administered prior to chemotherapy when given on the same day.
See also the Prescribing Information for the chemotherapy agents
administered in combination with KEYTRUDA, as appropriate.

Head and Neck Cancer

KEYTRUDA is indicated for the treatment of patients with recurrent or
metastatic head and neck squamous cell carcinoma (HNSCC) with disease
progression on or after platinum-containing chemotherapy. This
indication is approved under accelerated approval based on tumor
response rate and durability of response. Continued approval for this
indication may be contingent upon verification and description of
clinical benefit in the confirmatory trials. In HNSCC, KEYTRUDA is
administered at a fixed dose of 200 mg every three weeks until disease
progression, unacceptable toxicity, or up to 24 months in patients
without disease progression.

Classical Hodgkin Lymphoma

KEYTRUDA is indicated for the treatment of adult and pediatric patients
with refractory classical Hodgkin lymphoma (cHL), or who have relapsed
after 3 or more prior lines of therapy. This indication is approved
under accelerated approval based on tumor response rate and durability
of response. Continued approval for this indication may be contingent
upon verification and description of clinical benefit in the
confirmatory trials. In adults with cHL, KEYTRUDA is administered at a
fixed dose of 200 mg every three weeks until disease progression or
unacceptable toxicity, or up to 24 months in patients without disease
progression. In pediatric patients with cHL, KEYTRUDA is administered at
a dose of 2 mg/kg (up to a maximum of 200 mg) every three weeks until
disease progression or unacceptable toxicity, or up to 24 months in
patients without disease progression.

Primary Mediastinal Large B-Cell Lymphoma

KEYTRUDA is indicated for the treatment of adult and pediatric patients
with refractory primary mediastinal large B-cell lymphoma (PMBCL), or
who have relapsed after 2 or more prior lines of therapy. This
indication is approved under accelerated approval based on tumor
response rate and durability of response. Continued approval for this
indication may be contingent upon verification and description of
clinical benefit in confirmatory trials. KEYTRUDA is not recommended for
the treatment of patients with PMBCL who require urgent cytoreductive
therapy.

In adults with PMBCL, KEYTRUDA is administered at a fixed dose of 200 mg
every three weeks until disease progression, unacceptable toxicity, or
up to 24 months in patients without disease progression. In pediatric
patients with PMBCL, KEYTRUDA is administered at a dose of 2 mg/kg (up
to a maximum of 200 mg) every three weeks until disease progression or
unacceptable toxicity, or up to 24 months in patients without disease
progression.

Urothelial Carcinoma

KEYTRUDA is indicated for the treatment of patients with locally
advanced or metastatic urothelial carcinoma (mUC) who are not eligible
for cisplatin-containing chemotherapy and whose tumors express PD-L1
[Combined Positive Score (CPS) ≥10] as determined by an FDA-approved
test, or in patients who are not eligible for any platinum-containing
chemotherapy regardless of PD-L1 status. This indication is approved
under accelerated approval based on tumor response rate and duration of
response. Continued approval for this indication may be contingent upon
verification and description of clinical benefit in the confirmatory
trials.

KEYTRUDA is indicated for the treatment of patients with locally
advanced or metastatic urothelial carcinoma (mUC) who have disease
progression during or following platinum-containing chemotherapy or
within 12 months of neoadjuvant or adjuvant treatment with
platinum-containing chemotherapy.

In locally advanced or metastatic urothelial carcinoma, KEYTRUDA is
administered at a fixed dose of 200 mg every three weeks until disease
progression or unacceptable toxicity, or up to 24 months in patients
without disease progression.

Microsatellite Instability-High (MSI-H) Cancer

KEYTRUDA is indicated for the treatment of adult and pediatric patients
with unresectable or metastatic microsatellite instability-high (MSI-H)
or mismatch repair deficient (dMMR)

  • solid tumors that have progressed following prior treatment and who
    have no satisfactory alternative treatment options, or
  • colorectal cancer that has progressed following treatment with
    fluoropyrimidine, oxaliplatin, and irinotecan.

This indication is approved under accelerated approval based on tumor
response rate and durability of response. Continued approval for this
indication may be contingent upon verification and description of
clinical benefit in the confirmatory trials. The safety and
effectiveness of KEYTRUDA in pediatric patients with MSI-H central
nervous system cancers have not been established.

In adult patients with MSI-H cancer, KEYTRUDA is administered at a fixed
dose of 200 mg every three weeks until disease progression, unacceptable
toxicity, or up to 24 months in patients without disease progression. In
children with MSI-H cancer, KEYTRUDA is administered at a dose of 2
mg/kg (up to a maximum of 200 mg) every three weeks until disease
progression or unacceptable toxicity, or up to 24 months in patients
without disease progression.

Gastric Cancer

KEYTRUDA is indicated for the treatment of patients with recurrent
locally advanced or metastatic gastric or gastroesophageal junction
(GEJ) adenocarcinoma whose tumors express PD-L1 [Combined Positive Score
(CPS) ≥1] as determined by an FDA-approved test, with disease
progression on or after two or more prior lines of therapy including
fluoropyrimidine- and platinum-containing chemotherapy and if
appropriate, HER2/neu-targeted therapy. This indication is approved
under accelerated approval based on tumor response rate and durability
of response. Continued approval for this indication may be contingent
upon verification and description of clinical benefit in the
confirmatory trials. The recommended dose of KEYTRUDA is a fixed dose of
200 mg every three weeks until disease progression, unacceptable
toxicity, or up to 24 months in patients without disease progression.

Cervical Cancer

KEYTRUDA is indicated for the treatment of patients with recurrent or
metastatic cervical cancer with disease progression on or after
chemotherapy whose tumors express PD-L1 (CPS ≥1) as determined by an
FDA-approved test. This indication is approved under accelerated
approval based on tumor response rate and durability of response.
Continued approval for this indication may be contingent upon
verification and description of clinical benefit in the confirmatory
trials. The recommended dose of KEYTRUDA is a fixed dose of 200 mg every
three weeks until disease progression, unacceptable toxicity or up to 24
months in patients without disease progression.

Selected Important Safety Information for KEYTRUDA

Immune-Mediated Pneumonitis

KEYTRUDA can cause immune-mediated pneumonitis, including fatal cases.
Pneumonitis occurred in 3.4% (94/2799) of patients receiving KEYTRUDA,
including Grade 1 (0.8%), 2 (1.3%), 3 (0.9%), 4 (0.3%), and 5 (0.1%),
and occurred more frequently in patients with a history of prior
thoracic radiation (6.9%) compared to those without (2.9%). Monitor
patients for signs and symptoms of pneumonitis. Evaluate suspected
pneumonitis with radiographic imaging. Administer corticosteroids for
Grade 2 or greater pneumonitis. Withhold KEYTRUDA for Grade 2;
permanently discontinue KEYTRUDA for Grade 3 or 4 or recurrent Grade 2
pneumonitis.

Immune-Mediated Colitis

KEYTRUDA can cause immune-mediated colitis. Colitis occurred in 1.7%
(48/2799) of patients receiving KEYTRUDA, including Grade 2 (0.4%), 3
(1.1%), and 4 (0.1%). Monitor patients for signs and symptoms of
colitis. Administer corticosteroids for Grade 2 or greater colitis.
Withhold KEYTRUDA for Grade 2 or 3; permanently discontinue KEYTRUDA for
Grade 4 colitis.

Immune-Mediated Hepatitis

KEYTRUDA can cause immune-mediated hepatitis. Hepatitis occurred in 0.7%
(19/2799) of patients receiving KEYTRUDA, including Grade 2 (0.1%), 3
(0.4%), and 4 (0.1%). Monitor patients for changes in liver function.
Administer corticosteroids for Grade 2 or greater hepatitis and, based
on severity of liver enzyme elevations, withhold or discontinue KEYTRUDA.

Immune-Mediated Endocrinopathies

KEYTRUDA can cause hypophysitis, thyroid disorders, and type 1 diabetes
mellitus. Hypophysitis occurred in 0.6% (17/2799) of patients, including
Grade 2 (0.2%), 3 (0.3%), and 4 (0.1%). Hypothyroidism occurred in 8.5%
(237/2799) of patients, including Grade 2 (6.2%) and 3 (0.1%). The
incidence of new or worsening hypothyroidism was higher in patients with
HNSCC, occurring in 15% (28/192) of patients. Hyperthyroidism occurred
in 3.4% (96/2799) of patients, including Grade 2 (0.8%) and 3 (0.1%),
and thyroiditis occurred in 0.6% (16/2799) of patients, including Grade
2 (0.3%). Type 1 diabetes mellitus, including diabetic ketoacidosis,
occurred in 0.2% (6/2799) of patients.

Monitor patients for signs and symptoms of hypophysitis (including
hypopituitarism and adrenal insufficiency), thyroid function (prior to
and periodically during treatment), and hyperglycemia. For hypophysitis,
administer corticosteroids and hormone replacement as clinically
indicated. Withhold KEYTRUDA for Grade 2 and withhold or discontinue for
Grade 3 or 4 hypophysitis. Administer hormone replacement for
hypothyroidism and manage hyperthyroidism with thionamides and
beta-blockers as appropriate. Withhold or discontinue KEYTRUDA for Grade
3 or 4 hyperthyroidism. Administer insulin for type 1 diabetes, and
withhold KEYTRUDA and administer antihyperglycemics in patients with
severe hyperglycemia.

Immune-Mediated Nephritis and Renal Dysfunction

KEYTRUDA can cause immune-mediated nephritis. Nephritis occurred in 0.3%
(9/2799) of patients receiving KEYTRUDA, including Grade 2 (0.1%), 3
(0.1%), and 4 (0.1%) nephritis. Nephritis occurred in 1.7% (7/405) of
patients receiving KEYTRUDA in combination with pemetrexed and platinum
chemotherapy. Monitor patients for changes in renal function. Administer
corticosteroids for Grade 2 or greater nephritis. Withhold KEYTRUDA for
Grade 2; permanently discontinue for Grade 3 or 4 nephritis.

Immune-Mediated Skin Reactions

Immune-mediated rashes, including Stevens-Johnson syndrome (SJS), toxic
epidermal necrolysis (TEN) (some cases with fatal outcome), exfoliative
dermatitis, and bullous pemphigoid, can occur. Monitor patients for
suspected severe skin reactions and based on the severity of the adverse
reaction, withhold or permanently discontinue KEYTRUDA and administer
corticosteroids. For signs or symptoms of SJS or TEN, withhold KEYTRUDA
and refer the patient for specialized care for assessment and treatment.
If SJS or TEN is confirmed, permanently discontinue KEYTRUDA.

Other Immune-Mediated Adverse Reactions

Immune-mediated adverse reactions, which may be severe or fatal, can
occur in any organ system or tissue in patients receiving KEYTRUDA and
may also occur after discontinuation of treatment. For suspected
immune-mediated adverse reactions, ensure adequate evaluation to confirm
etiology or exclude other causes. Based on the severity of the adverse
reaction, withhold KEYTRUDA and administer corticosteroids. Upon
improvement to Grade 1 or less, initiate corticosteroid taper and
continue to taper over at least 1 month. Based on limited data from
clinical studies in patients whose immune-related adverse reactions
could not be controlled with corticosteroid use, administration of other
systemic immunosuppressants can be considered. Resume KEYTRUDA when the
adverse reaction remains at Grade 1 or less following corticosteroid
taper. Permanently discontinue KEYTRUDA for any Grade 3 immune-mediated
adverse reaction that recurs and for any life-threatening
immune-mediated adverse reaction.

The following clinically significant immune-mediated adverse reactions
occurred in less than 1% (unless otherwise indicated) of 2799 patients:
arthritis (1.5%), uveitis, myositis, Guillain-Barré syndrome, myasthenia
gravis, vasculitis, pancreatitis, hemolytic anemia, sarcoidosis, and
encephalitis. In addition, myelitis and myocarditis were reported in
other clinical trials and postmarketing use.

Treatment with KEYTRUDA may increase the risk of rejection in solid
organ transplant recipients. Consider the benefit of treatment vs the
risk of possible organ rejection in these patients.

Infusion-Related Reactions

KEYTRUDA can cause severe or life-threatening infusion-related
reactions, including hypersensitivity and anaphylaxis, which have been
reported in 0.2% (6/2799) of patients. Monitor patients for signs and
symptoms of infusion-related reactions. For Grade 3 or 4 reactions, stop
infusion and permanently discontinue KEYTRUDA.

Complications of Allogeneic Hematopoietic Stem Cell Transplantation
(HSCT)

Immune-mediated complications, including fatal events, occurred in
patients who underwent allogeneic HSCT after treatment with KEYTRUDA. Of
23 patients with cHL who proceeded to allogeneic HSCT after KEYTRUDA, 6
developed graft-versus-host disease (GVHD) (1 fatal case) and 2
developed severe hepatic veno-occlusive disease (VOD) after
reduced-intensity conditioning (1 fatal case). Cases of fatal hyperacute
GVHD after allogeneic HSCT have also been reported in patients with
lymphoma who received a PD-1 receptor–blocking antibody before
transplantation. Follow patients closely for early evidence of
transplant-related complications such as hyperacute graft-versus-host
disease (GVHD), Grade 3 to 4 acute GVHD, steroid-requiring febrile
syndrome, hepatic veno-occlusive disease (VOD), and other
immune-mediated adverse reactions.

In patients with a history of allogeneic HSCT, acute GVHD (including
fatal GVHD) has been reported after treatment with KEYTRUDA. Patients
who experienced GVHD after their transplant procedure may be at
increased risk for GVHD after KEYTRUDA. Consider the benefit of KEYTRUDA
vs the risk of GVHD in these patients.

Increased Mortality in Patients With Multiple Myeloma

In clinical trials in patients with multiple myeloma, the addition of
KEYTRUDA to a thalidomide analogue plus dexamethasone resulted in
increased mortality. Treatment of these patients with a PD-1 or PD-L1
blocking antibody in this combination is not recommended outside of
controlled clinical trials.

Embryofetal Toxicity

Based on its mechanism of action, KEYTRUDA can cause fetal harm when
administered to a pregnant woman. If used during pregnancy, or if the
patient becomes pregnant during treatment, apprise the patient of the
potential hazard to a fetus. Advise females of reproductive potential to
use highly effective contraception during treatment and for 4 months
after the last dose of KEYTRUDA.

Adverse Reactions

In KEYNOTE-006, KEYTRUDA was discontinued due to adverse reactions in 9%
of 555 patients with advanced melanoma; adverse reactions leading to
permanent discontinuation in more than one patient were colitis (1.4%),
autoimmune hepatitis (0.7%), allergic reaction (0.4%), polyneuropathy
(0.4%), and cardiac failure (0.4%). The most common adverse reactions
(≥20%) with KEYTRUDA were fatigue (28%), diarrhea (26%), rash (24%), and
nausea (21%).

In KEYNOTE-189, when KEYTRUDA was administered with pemetrexed and
platinum chemotherapy in metastatic nonsquamous NSCLC, KEYTRUDA was
discontinued due to adverse reactions in 20% of 405 patients. The most
common adverse reactions resulting in permanent discontinuation of
KEYTRUDA were pneumonitis (3%) and acute kidney injury (2%). The most
common adverse reactions (≥20%) with KEYTRUDA were nausea (56%), fatigue
(56%), constipation (35%), diarrhea (31%), decreased appetite (28%),
rash (25%), vomiting (24%), cough (21%), dyspnea (21%), and pyrexia
(20%).

In KEYNOTE-407, when KEYTRUDA was administered with carboplatin and
either paclitaxel or nab-paclitaxel in metastatic squamous NSCLC,
KEYTRUDA was discontinued due to adverse reactions in 15% of 101
patients. The most frequent serious adverse reactions reported in at
least 2% of patients were febrile neutropenia, pneumonia, and urinary
tract infection. Adverse reactions observed in KEYNOTE-407 were similar
to those observed in KEYNOTE-189 with the exception that increased
incidences of alopecia (47% vs 36%) and peripheral neuropathy (31% vs
25%) were observed in the KEYTRUDA and chemotherapy arm compared to the
placebo and chemotherapy arm in KEYNOTE-407.

In KEYNOTE-010, KEYTRUDA monotherapy was discontinued due to adverse
reactions in 8% of 682 patients with metastatic NSCLC. The most common
adverse event resulting in permanent discontinuation of KEYTRUDA was
pneumonitis (1.8%). The most common adverse reactions (≥20%) were
decreased appetite (25%), fatigue (25%), dyspnea (23%), and nausea (20%).

In KEYNOTE-012, KEYTRUDA was discontinued due to adverse reactions in
17% of 192 patients with HNSCC. Serious adverse reactions occurred in
45% of patients. The most frequent serious adverse reactions reported in
at least 2% of patients were pneumonia, dyspnea, confusional state,
vomiting, pleural effusion, and respiratory failure. The most common
adverse reactions (≥20%) were fatigue, decreased appetite, and dyspnea.
Adverse reactions occurring in patients with HNSCC were generally
similar to those occurring in patients with melanoma or NSCLC, with the
exception of increased incidences of facial edema and new or worsening
hypothyroidism.

In KEYNOTE-087, KEYTRUDA was discontinued due to adverse reactions in 5%
of 210 patients with cHL. Serious adverse reactions occurred in 16% of
patients; those ≥1% included pneumonia, pneumonitis, pyrexia, dyspnea,
GVHD, and herpes zoster. Two patients died from causes other than
disease progression; 1 from GVHD after subsequent allogeneic HSCT and 1
from septic shock. The most common adverse reactions (≥20%) were fatigue
(26%), pyrexia (24%), cough (24%), musculoskeletal pain (21%), diarrhea
(20%), and rash (20%).

In KEYNOTE-170, KEYTRUDA was discontinued due to adverse reactions in 8%
of 53 patients with PMBCL. Serious adverse reactions occurred in 26% of
patients and included arrhythmia (4%), cardiac tamponade (2%),
myocardial infarction (2%), pericardial effusion (2%), and pericarditis
(2%). Six (11%) patients died within 30 days of start of treatment. The
most common adverse reactions (≥20%) were musculoskeletal pain (30%),
upper respiratory tract infection and pyrexia (28% each), cough (26%),
fatigue (23%), and dyspnea (21%).

In KEYNOTE-052, KEYTRUDA was discontinued due to adverse reactions in
11% of 370 patients with locally advanced or metastatic urothelial
carcinoma. Serious adverse reactions occurred in 42% of patients; those
≥2% were urinary tract infection, hematuria, acute kidney injury,
pneumonia, and urosepsis. The most common adverse reactions (≥20%) were
fatigue (38%), musculoskeletal pain (24%), decreased appetite (22%),
constipation (21%), rash (21%), and diarrhea (20%).

In KEYNOTE-045, KEYTRUDA was discontinued due to adverse reactions in 8%
of 266 patients with locally advanced or metastatic urothelial
carcinoma. The most common adverse reaction resulting in permanent
discontinuation of KEYTRUDA was pneumonitis (1.9%). Serious adverse
reactions occurred in 39% of KEYTRUDA-treated patients; those ≥2% were
urinary tract infection, pneumonia, anemia, and pneumonitis. The most
common adverse reactions (≥20%) in patients who received KEYTRUDA were
fatigue (38%), musculoskeletal pain (32%), pruritus (23%), decreased
appetite (21%), nausea (21%), and rash (20%).

Adverse reactions occurring in patients with gastric cancer were similar
to those occurring in patients with melanoma or NSCLC.

In KEYNOTE-158, KEYTRUDA was discontinued due to adverse reactions in 8%
of 98 patients with recurrent or metastatic cervical cancer. Serious
adverse reactions occurred in 39% of patients receiving KEYTRUDA; the
most frequent included anemia (7%), fistula, hemorrhage, and infections
[except urinary tract infections] (4.1% each). The most common adverse
reactions (≥20%) were fatigue (43%), musculoskeletal pain (27%),
diarrhea (23%), pain and abdominal pain (22% each), and decreased
appetite (21%).

Lactation

It is not known whether KEYTRUDA is excreted in human milk. Because many
drugs are excreted in human milk, instruct women to discontinue nursing
during treatment with KEYTRUDA and for 4 months after the final dose.

Pediatric Use

There is limited experience in pediatric patients. In a study in 40
pediatric patients with advanced melanoma, lymphoma, or PD-L1–positive
advanced, relapsed, or refractory solid tumors, the safety profile was
similar to that seen in adults treated with KEYTRUDA. Toxicities that
occurred at a higher rate (≥15% difference) in these patients when
compared to adults under 65 years of age were fatigue (45%), vomiting
(38%), abdominal pain (28%), hypertransaminasemia (28%), and
hyponatremia (18%).

About the Eisai and Merck Strategic Collaboration

In March 2018, Eisai and Merck, known as MSD outside the United States
and Canada, through an affiliate, entered into a strategic collaboration
for the worldwide co-development and co-commercialization of LENVIMA.
Under the agreement, the companies will jointly develop and
commercialize LENVIMA, both as monotherapy and in combination with
Merck’s anti-PD-1 therapy KEYTRUDA. In addition to ongoing clinical
studies of the combination, the companies will jointly initiate new
clinical studies evaluating the LENVIMA and KEYTRUDA combination to
support 11 potential indications in six types of cancer (bladder cancer,
endometrial cancer, head and neck cancer, hepatocellular carcinoma,
melanoma and non-small cell lung cancer), as well as a basket trial
targeting six additional cancer types. The LENVIMA and KEYTRUDA
combination is not approved in any cancer types today.

About Eisai Inc.

At Eisai Inc., human health care (hhc) is our goal. We
give our first thoughts to patients and their families, and helping to
increase the benefits health care provides. As the U.S. pharmaceutical
subsidiary of Tokyo-based Eisai Co., Ltd., we have a passionate
commitment to patient care that is the driving force behind our efforts
to discover and develop innovative therapies to help address unmet
medical needs.

Eisai is a fully integrated pharmaceutical business that operates in two
global business groups: oncology and neurology (dementia-related
diseases and neurodegenerative diseases). Each group functions as an
end-to-end global business with discovery, development, manufacturing
and marketing capabilities. Our U.S. headquarters, commercial and
clinical development organizations are located in New Jersey; our
discovery labs are in Massachusetts and Pennsylvania; and our global
demand chain organization resides in Maryland and North Carolina. To
learn more about Eisai Inc., please visit us at eisai.com/us.

Merck’s Focus on Cancer

Our goal is to translate breakthrough science into innovative oncology
medicines to help people with cancer worldwide. At Merck, the potential
to bring new hope to people with cancer drives our purpose and
supporting accessibility to our cancer medicines is our commitment. As
part of our focus on cancer, Merck is committed to exploring the
potential of immuno-oncology with one of the largest development
programs in the industry across more than 30 tumor types. We also
continue to strengthen our portfolio through strategic acquisitions and
are prioritizing the development of several promising oncology
candidates with the potential to improve the treatment of advanced
cancers. For more information about our oncology clinical trials, visit www.merck.com/clinicaltrials.

About Merck

For more than a century, Merck, a leading global biopharmaceutical
company known as MSD outside of the United States and Canada, has been
inventing for life, bringing forward medicines and vaccines for many of
the world’s most challenging diseases. Through our prescription
medicines, vaccines, biologic therapies and animal health products, we
work with customers and operate in more than 140 countries to deliver
innovative health solutions. We also demonstrate our commitment to
increasing access to health care through far-reaching policies, programs
and partnerships. Today, Merck continues to be at the forefront of
research to advance the prevention and treatment of diseases that
threaten people and communities around the world – including cancer,
cardio-metabolic diseases, emerging animal diseases, Alzheimer’s disease
and infectious diseases including HIV and Ebola. For more information,
visit www.merck.com
and connect with us on Twitter,
Facebook,
Instagram,
YouTube
and LinkedIn.

Forward-Looking Statement of Merck Co., Inc., Kenilworth, N.J., USA

This news release of Merck Co., Inc., Kenilworth, N.J., USA (the
“company”) includes “forward-looking statements” within the meaning of
the safe harbor provisions of the U.S. Private Securities Litigation
Reform Act of 1995. These statements are based upon the current beliefs
and expectations of the company’s management and are subject to
significant risks and uncertainties. There can be no guarantees with
respect to pipeline products that the products will receive the
necessary regulatory approvals or that they will prove to be
commercially successful. If underlying assumptions prove inaccurate or
risks or uncertainties materialize, actual results may differ materially
from those set forth in the forward-looking statements.

Risks and uncertainties include but are not limited to, general industry
conditions and competition; general economic factors, including interest
rate and currency exchange rate fluctuations; the impact of
pharmaceutical industry regulation and health care legislation in the
United States and internationally; global trends toward health care cost
containment; technological advances, new products and patents attained
by competitors; challenges inherent in new product development,
including obtaining regulatory approval; the company’s ability to
accurately predict future market conditions; manufacturing difficulties
or delays; financial instability of international economies and
sovereign risk; dependence on the effectiveness of the company’s patents
and other protections for innovative products; and the exposure to
litigation, including patent litigation, and/or regulatory actions.

The company undertakes no obligation to publicly update any
forward-looking statement, whether as a result of new information,
future events or otherwise. Additional factors that could cause results
to differ materially from those described in the forward-looking
statements can be found in the company’s 2017 Annual Report on Form 10-K
and the company’s other filings with the Securities and Exchange
Commission (SEC) available at the SEC’s Internet site (www.sec.gov).

Please see Prescribing Information for LENVIMA (lenvatinib) at http://www.lenvima.com/pdfs/prescribing-information.pdf.

Please see Prescribing Information for KEYTRUDA at http://www.merck.com/product/usa/pi_circulars/k/keytruda/keytruda_pi.pdf
and Medication Guide for KEYTRUDA at
http://www.merck.com/product/usa/pi_circulars/k/keytruda/keytruda_mg.pdf.

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