Merck’s KEYTRUDA® (pembrolizumab) Reduced Risk of Death by 31 Percent Compared to Chemotherapy in Previously Treated Patients with Advanced Esophageal or Esophagogastric Junction Carcinoma Whose Tumors Expressed PD-L1 (CPS ≥10)

Save

January 14, 2019 5:00 pm ET

Results from Phase 3 KEYNOTE-181 Trial to be Presented at 2019 Gastrointestinal Cancers Symposium (ASCO GI)

KENILWORTH, N.J.–(BUSINESS WIRE)–Merck (NYSE:MRK), known as MSD outside the United States and Canada,
today announced the first presentation of results from KEYNOTE-181, a
Phase 3 trial investigating KEYTRUDA, Merck’s anti-PD-1 therapy, as
monotherapy for the second-line treatment of advanced or metastatic
esophageal or esophagogastric junction carcinoma. In this pivotal study,
KEYTRUDA met a primary endpoint by significantly improving overall
survival (OS) in patients with squamous cell carcinoma or adenocarcinoma
who progressed after standard therapy and whose tumors expressed PD-L1
(Combined Positive Score [CPS] ≥10), with a 31 percent reduction in the
risk of death compared to chemotherapy (paclitaxel, docetaxel or
irinotecan) (HR=0.69 [95% CI, 0.52-0.93]; p=0.0074). This represents the
first time an anti-PD-1 therapy has demonstrated a survival benefit for
this patient population. The primary endpoint of OS was also evaluated
in patients with squamous cell histology and in the entire
intention-to-treat (ITT) study population. While directionally
favorable, statistical significance for OS was not met in these two
patient groups. These results, as well as other study findings, are
being presented at the 2019 Gastrointestinal Cancers Symposium (ASCO GI)
in San Francisco in an oral presentation on Thursday, Jan. 17 (Abstract
#2).

“The prognosis for patients diagnosed with esophageal cancer is poor,
and for those who experience disease progression, there is no
established standard of care, underscoring the need for improved
therapies in the second-line setting,” said Dr. Takashi Kojima,
professor at the Department of Gastroenterology and Gastrointestinal
Oncology at the National Cancer Center Hospital East in Kashiwa, Japan.
“The significant improvement in overall survival observed with KEYTRUDA
in patients with squamous cell carcinoma or adenocarcinoma whose tumors
expressed PD-L1 with a CPS of 10 or greater represents an important
scientific advancement and has the potential to benefit patients who
currently have limited treatment options.”

“Esophageal cancer often progresses aggressively, so we are encouraged
to see these overall survival results for KEYTRUDA as monotherapy in
previously treated patients,” said Dr. Roy Baynes, senior vice president
and head of global clinical development, chief medical officer, Merck
Research Laboratories. “Merck is committed to understanding the clinical
benefit of KEYTRUDA across a range of gastrointestinal cancers,
including esophageal cancer. Along with other new data for KEYTRUDA and
from our broad oncology portfolio, we are pleased to share our latest
clinical research in gastrointestinal cancers at ASCO GI.”

As previously announced, data from KEYNOTE-181 will be submitted to the
U.S. Food and Drug Administration (FDA) and other regulatory authorities
for review.

Merck is continuing to study KEYTRUDA across multiple settings and
stages of gastrointestinal cancer – including gastric, hepatocellular
carcinoma and esophageal – through a broad clinical program comprised of
more than 9,000 patients in 65 studies involving KEYTRUDA, including
7,000 patients in 35 Merck-affiliated studies. In esophageal cancer, the
Phase 3 trial KEYNOTE-590, evaluating KEYTRUDA in combination with
chemotherapy as a first-line treatment, is ongoing.

Study Design and Additional Data from KEYNOTE-181 (Abstract #2)

KEYNOTE-181 is a randomized, open-label, Phase 3 trial
(ClinicalTrials.gov, NCT02564263)
investigating KEYTRUDA monotherapy compared to chemotherapy in more than
600 patients with advanced or metastatic adenocarcinoma or squamous cell
carcinoma of the esophagus, or Siewert type I adenocarcinoma of the
esophagogastric junction that has progressed after first-line standard
therapy. The primary endpoint is OS (evaluated in all patients as well
as in patients with PD-L1 CPS ≥10 and in patients with squamous cell
carcinoma). Secondary endpoints are progression-free survival (PFS),
objective response rate (ORR) and safety/tolerability.

In the study, a total of 628 patients were randomized 1:1 to receive
either KEYTRUDA (200 mg fixed dose every three weeks) or investigator’s
choice of any of the following chemotherapy regimens, all given
intravenously: docetaxel (75 mg/m² on Day 1 of each 21-day
cycle), paclitaxel (80-100 mg/m² on Days 1, 8, and 15 of each
28-day cycle), or irinotecan (80 mg/m² on Day 1 of each
14-day cycle). Of these 628 patients, 401 had squamous cell carcinoma,
and 222 had a PD-L1 CPS ≥10. Median follow-up for the study was 7.1
months for KEYTRUDA and 6.9 months for chemotherapy.

Among patients in the study whose tumors expressed PD-L1 (CPS ≥10)
(n=222/628), the median OS in the KEYTRUDA group was 9.3 months (95% CI,
6.6-12.5) compared to a median OS of 6.7 months for patients in the
chemotherapy group (95% CI, 5.1-8.2). In addition, the estimated
12-month OS rate in these patients was 43 percent for KEYTRUDA compared
with 20 percent for chemotherapy.

In patients with squamous cell carcinoma (n=401/628), there was a
clinically meaningful improvement in OS with KEYTRUDA compared to
chemotherapy, which did not meet statistical significance per the
pre-specified statistical plan (HR=0.78 [95% CI, 0.63-0.96]; p=0.0095).
Among these 401 patients, median OS was 8.2 months in the KEYTRUDA group
(95% CI, 6.7-10.3) compared with 7.1 months in the chemotherapy group
(95% CI, 6.1-8.2).

In the entire ITT study population (n=628), while also directionally
favorable, the difference in OS was not statistically significant
(HR=0.89 [95% CI, 0.75-1.05]; p=0.0560), with a median OS of 7.1 months
for both treatment groups. Per the pre-specified statistical analysis
plan, the secondary endpoints of PFS and ORR were not formally tested,
as OS was not reached in the full ITT study population.

The safety of KEYTRUDA in KEYNOTE-181 was consistent with what has been
seen in previous trials among patients treated with KEYTRUDA
monotherapy. Treatment-related adverse events (TRAEs) occurred in 64.3
percent of patients taking KEYTRUDA compared with 86.1 percent for
chemotherapy. The most common TRAEs in the KEYTRUDA group with an
incidence of 5 percent or more were fatigue (11.8%), hypothyroidism
(10.5%), decreased appetite (8.6%), asthenia (7.0%), nausea (7.0%) and
diarrhea (5.4%). Grade 3-5 TRAEs occurred in 57 patients (18.2%) taking
KEYTRUDA compared with 121 (40.9%) on chemotherapy. There were five
treatment-related deaths in each of the groups.

About Esophageal Cancer

Esophageal cancer, a type of cancer that is particularly difficult to
treat, begins in the inner layer (mucosa) of the esophagus and grows
outward. There are two main types of esophageal cancer: squamous cell
carcinoma and adenocarcinoma. Globally, esophageal cancer is the seventh
most commonly diagnosed cancer. This year, an estimated 17,650 adults in
the United States will be diagnosed with esophageal cancer, and 16,080
deaths from this disease will occur. Worldwide, there were estimated to
be over 572,000 new cases of esophageal cancer and approximately 508,000
deaths resulting from this disease in 2018 alone.

About KEYTRUDA
^®
(pembrolizumab) Injection,
100mg

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 900 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 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.

Hepatocellular Carcinoma

KEYTRUDA is indicated for the treatment of patients with hepatocellular
carcinoma (HCC) who have been previously treated with sorafenib. 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.

Merkel Cell Carcinoma

KEYTRUDA is indicated for the treatment of adult and pediatric patients
with recurrent locally advanced or metastatic Merkel cell carcinoma.
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 in adults is 200 mg administered as an intravenous infusion
over 30 minutes every three weeks until disease progression,
unacceptable toxicity, or up to 24 months in patients without disease
progression. The recommended dose of KEYTRUDA in pediatric patients is 2
mg/kg (up to a maximum of 200 mg), administered as an intravenous
infusion over 30 minutes every three weeks until disease progression or
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 who
received KEYTRUDA as a monotherapy, 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 who received
KEYTRUDA as a monotherapy.

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%).

Adverse reactions occurring in patients with HCC were generally similar
to those in patients with melanoma or NSCLC who received KEYTRUDA as a
monotherapy, with the exception of increased incidences of ascites (8%
Grades 3-4) and immune-mediated hepatitis (2.9%). Laboratory
abnormalities (Grades 3-4) that occurred at a higher incidence were
elevated AST (20%), ALT (9%), and hyperbilirubinemia (10%).

Among the 50 patients with MCC enrolled in KEYNOTE-017, adverse
reactions were similar to those occurring in patients with melanoma or
NSCLC who received KEYTRUDA as a monotherapy. Laboratory abnormalities
(Grades 3-4) that occurred at a higher incidence were elevated AST (11%)
and hyperglycemia (19%).

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%).

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 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