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EDITED TRANSCRIPT
MRK.N - Q1 2023 Merck & Co Inc Earnings Call

EVENT DATE/TIME: APRIL 27, 2023 / 1:00PM GMT

OVERVIEW:
Co. reported 1Q23 total revenue of $14.5b and non-GAAP EPS of $1.40. Expects
2023 revenue to be $57.7-58.9b and EPS to be $6.88-7.00.

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APRIL 27, 2023 / 1:00PM, MRK.N - Q1 2023 Merck & Co Inc Earnings Call

CORPORATE PARTICIPANTS
Caroline Litchfield Merck & Co., Inc. - Executive VP & CFO
Dean Y. Li Merck & Co., Inc. - Executive VP & President of Merck Research Laboratories
Peter Dannenbaum Merck & Co., Inc. - VP of IR
Robert M. Davis Merck & Co., Inc. - Chairman, President & CEO

CONFERENCE CALL PARTICIPANTS


Andrew Simon Baum Citigroup Inc., Research Division - Global Head of Healthcare Research and MD
Carter Lewis Gould Barclays Bank PLC, Research Division - Senior Analyst
Chris Shibutani Goldman Sachs Group, Inc., Research Division - Research Analyst
Daina Michelle Graybosch SVB Securities LLC, Research Division - Senior MD of Immuno-Oncology and Senior Research Analyst
Hardik K. Parikh JPMorgan Chase & Co, Research Division - Research Analyst
Luisa Caroline Hector Joh. Berenberg, Gossler & Co. KG, Research Division - Co-Head of Global Pharmaceutical Team
Mara Goldstein Mizuho Securities USA LLC, Research Division - MD of Equity Research Department
Seamus Christopher Fernandez Guggenheim Securities, LLC, Research Division - Senior Analyst of Global Pharmaceuticals
Timothy Minton Anderson Wolfe Research, LLC - MD of Equity Research
Trung Chuong Huynh Crédit Suisse AG, Research Division - Research Analyst
Umer Raffat Evercore ISI Institutional Equities, Research Division - Senior MD & Senior Analyst of Equity Research
Robert Ruzic Morgan Stanley
Yihan Li UBS
Malcolm Hoffman BMO

PRESENTATION
Operator
Thank you for standing by. Welcome to the Merck & Company Q1 Sales and Earnings Conference Call. (Operator Instructions) This call is being
recorded. If you have any objections, you may disconnect at this time.

I would now like to turn the call over to Mr. Peter Dannenbaum, Vice President, Investor Relations. Sir, you may begin.

Peter Dannenbaum - Merck & Co., Inc. - VP of IR


Thank you, and good morning. Welcome to Merck's First Quarter 2023 Conference Call. Speaking on today's call will be Rob Davis, Chairman and
Chief Executive Officer; Caroline Litchfield, Chief Financial Officer; and Dr. Dean Li, President of Merck Research Labs.

Before we get started, I'd like to point out a few items. You will see that we have items in our GAAP results such as acquisition-related charges,
restructuring costs and certain other items. You should note that we have excluded these from our non-GAAP results and provide a reconciliation
in our press release. I would like to remind you that some of the statements that we make today may be considered forward-looking statements
within the meaning of the safe harbor provision of the U.S. Private Securities Litigation Reform Act of 1995. Such statements are made based on
the current beliefs of Merck's management and are subject to significant risks and uncertainties. If our underlying assumptions prove inaccurate

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APRIL 27, 2023 / 1:00PM, MRK.N - Q1 2023 Merck & Co Inc Earnings Call

or uncertainties materialize, actual results may differ materially from those set forth in the forward-looking statements. Our SEC filings, including
Item 1A and the 2022 10-K, identify certain risk factors and cautionary statements that could cause the company's actual results to differ materially
from those projected in any of our forward-looking statements made this morning. Merck undertakes no obligation to publicly update any
forward-looking statements.

During today's call, a slide presentation will accompany our speakers' prepared remarks. These slides, along with the earnings release, today's
prepared remarks and our SEC filings are all posted to the Investor Relations section of Merck's website.

With that, I'd like to turn the call over to Rob.

Robert M. Davis - Merck & Co., Inc. - Chairman, President & CEO
Thanks, Peter. Good morning, and thank you for joining today's call. We began 2023 with significant advancements across key areas of our pipeline
and with continued strong performance of our key growth drivers. I remain very pleased with the consistency and excellence of our team's execution,
and I'm confident that our strategy is leading to sustainable success. We remain grounded in our shared purpose to bring forward bold science
that delivered solutions, which address serious unmet medical needs and importantly, save and improve lives around the world.

Our priorities remain consistent. By focusing on our science-led strategy, we intend to bring forward important innovation from our internal
discovery pipeline and via strategic business development targeted at accessing the most compelling and complementary external science,
leveraging our best-in-class clinical development capabilities. We aim to sustain the momentum in our pipeline in 2023 and beyond, and we're
confident that this will lead to strong commercial and financial performance as well as value creation for patients and shareholders over the long
term.

Speaking of accessing important external innovation, we're very pleased with our announced acquisition of Prometheus Biosciences. Prometheus
brings us a potential best-in-class novel treatment that could transform the standard of care for patients suffering from ulcerative colitis and Crohn's
disease, potentially debilitating conditions as well as a broader pipeline and a technology platform that enables a precision medicine approach. It
accelerates our presence in immunology, increases the diversity of our pipeline and brings us a potentially significant revenue growth driver
through the next decade. This transaction is also another example of Merck acting decisively when science and value align.

Turning now to our first quarter results. We delivered very significant underlying growth, excluding the expected year-over-year decline in LAGEVRIO
sales. This reflects continued fundamental strength and momentum across our key growth drivers particularly in oncology and vaccines. These
results reinforce our confidence in the robust demand for our innovative portfolio and in our outlook for the remainder of 2023, which Caroline
will speak to in a moment.

Moving to our research organization. We've made significant advancements. In cardiovascular, we shared the remarkable work of our research
colleagues at the American College of Cardiology Conference in March. The strength of the data from the Phase III STELLAR trial studying sotatercept
in pulmonary arterial hypertension reinforces our belief in this important new mechanisms potential to change the treatment paradigm for patients.

In addition, impressive results from the Phase II trial studying our oral PCSK9 inhibitor suggests that this could be a globally accessible treatment
option for patients in need of LDL cholesterol reduction.

The successes we are achieving across our cardiovascular pipeline have created excitement across our company and a belief that Merck will build
on its strong legacy of bringing forth breakthrough therapies for the benefit of patients suffering from cardiovascular disease and that these
programs will contribute significantly to our long-term growth.

In oncology, we were pleased to share the positive top line results from KEYNOTE-671, which showed a significant improvement in event-free
survival in certain patients with early-stage non-small cell lung cancer, and we look forward to potential approval later this year. In addition, we
are working with our partner, Moderna to rapidly expand our efforts to study the combination of KEYTRUDA with an individualized neoantigen
therapy, which we previously referred to as a personalized cancer vaccine therapy in adjuvant melanoma and potential additional tumor types.

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APRIL 27, 2023 / 1:00PM, MRK.N - Q1 2023 Merck & Co Inc Earnings Call

I'm very encouraged by the substantial progress we've made across our broad pipeline. We're now working on a greater number of late-stage
programs across more therapeutic areas and modalities than at any time in recent years.

In summary, we've begun 2023 with scientific, commercial and operational momentum and expect strong full year growth across both our Human
and Animal Health businesses. I'm proud of the progress we've made, but as always recognize the need to move with speed and urgency to do
even more. I want to thank our global team for their steadfast dedication as we build a sustainable innovation engine that will deliver value for
patients and shareholders well into the next decade.

With that, I'll turn the call over to Caroline.

Caroline Litchfield - Merck & Co., Inc. - Executive VP & CFO


Thank you, Rob. Good morning. As Rob highlighted, we are off to a strong start to the year with robust underlying performance across our key
growth pillars. These results further demonstrate but our focus on science and innovation as the core of our strategy is working. Our success is
enabled by the excellent execution of our team of dedicated colleagues who are delivering our important medicines and vaccines to people and
animals across the globe. We remain very confident in our ability to continue to deliver in the short term while we make disciplined investments
to maximize long-term value for patients and shareholders.

Now turning to our first quarter results. Total company revenues were $14.5 billion. Excluding the impact from LAGEVRIO and foreign exchange,
the business delivered very strong underlying growth of 15%. The remainder of my revenue comments will be on an ex exchange basis.

Our Human Health business continued its strong momentum, excluding LAGEVRIO, growth was 18%, driven by oncology and vaccines. Our Animal
Health business also delivered solid performance with sales increasing 5% and driven by growth across both livestock and companion animal
products.

Now turning to the first quarter performance of our key brands. In oncology, KEYTRUDA grew 24% to $5.8 billion, driven by robust global demand
for metastatic indications as well as increased utilization driven by approvals in early-stage cancers. In the U.S., KEYTRUDA grew across all key tumor
types and continues to benefit from uptake in earlier stage cancers, including triple-negative breast cancer as well as in certain types of renal cell
carcinoma and melanoma.

We continue to anticipate gradual uptake from KEYNOTE-091 in earlier stage lung cancer as we are working with the medical community to increase
adjuvant treatment rates for diagnosed patients receiving surgery. We, along with others, are also working to improve upon the low level of lung
cancer screenings and follow-up through diagnosis which we anticipate will increase over time. We are encouraged by the positive feedback
received thus far.

Furthermore, we are excited by the potential to bring an additional treatment option to patients following the positive results of the KEYNOTE-671
study. Together, these studies position us well to extend our leadership in non-small cell lung cancer. We also look forward to providing a new
treatment option to certain adult patients with bladder cancer following the recent approval of KEYNOTE-869.

Outside the U.S. KEYTRUDA continues to maintain its leadership in non-small cell lung cancer. Growth was driven by uptake in metastatic renal
cell carcinoma and certain types of head and neck cancer as well as in earlier stage cancers, including certain types of high-risk early-stage
triple-negative breast cancer, which continues to launch in additional markets.

Lynparza remains the market-leading PARP inhibitor. Alliance revenue grew 8%, primarily due to increased demand in key European markets in
certain patients with ovarian cancer. Lenvima alliance revenue grew 5% due to increased uptake in the treatment of certain patients with advanced
renal cell carcinoma in key European markets. Our vaccines portfolio delivered excellent growth led by GARDASIL, which grew 43% to $2 billion.
Performance was driven by strong demand in major ex-U.S. markets particularly China as well as increased supply. Growth also benefited from an
acceleration of shipments to China from the second half to the first half of the year to ensure the availability of product to meet heightened demand
following the approval of the expanded indication of GARDASIL 9 for girls and women, 9 to 45 years of age. Vaccine sales also benefited from the

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APRIL 27, 2023 / 1:00PM, MRK.N - Q1 2023 Merck & Co Inc Earnings Call

increasing demand for VAXNEUVANCE following the ongoing pediatric launch, particularly in the U.S. In our hospital acute care portfolio, BRIDION
sales grew 27%, driven by an increase in market share among neuromuscular blockade reversal agents.

Our Animal Health business delivered another good quarter with sales increasing 5%, reflecting strong demand across our livestock portfolio,
particularly in ruminant and poultry products as well as strategic price actions.

I will now walk you through the remainder of our P&L, and my comments will be on a non-GAAP basis. Gross margin was 76.9%, an increase of 6.1
percentage points due to favorable product mix, which reflects a benefit from the lower sales of LAGEVRIO. Operating expenses increased to $6.7
billion, reflecting $1.4 billion of charges related to the acquisition of Imago and our license and collaboration agreement with Kelun. Excluding
these charges, operating expenses grew 12%, driven by increased investments to support our key growth drivers and pipeline. Other income was
$17 million. Our tax rate was 20.4%, reflecting the unfavorable impact from the Imago transaction for which no tax benefit was recognized. Taken
together, we earned $1.40 per share, which includes a $0.52 impact from charges related to the acquisition of Imago and our agreement with
Kelun.

Turning now to our 2023 non-GAAP guidance. The continued operational strength of our business enables us to raise and narrow our full year
revenue guidance. We now project revenue to be between $57.7 billion and $58.9 billion, including approximately $1 billion from LAGEVRIO. We
expect strong underlying revenue growth of 8% to 10%, offset by the decline in LAGEVRIO and an approximate 2 percentage point negative impact
from foreign exchange using mid-April rates.

Our gross margin is still expected to be approximately 77%. We have narrowed the estimated range of operating expenses to be between $23.3
billion and $24.1 billion. As a reminder, this range includes $1.4 billion of upfront research and development expenses related to the acquisition
of Imago and our agreement with Kelun. This guidance does not assume the proposed acquisition of Prometheus or any additional significant
potential business development transactions. Other income is anticipated to be approximately $250 million. We continue to assume a full year tax
rate between 17% and 18%, and approximately 2.55 billion shares outstanding. Taken together, we are increasing and narrowing our expected
EPS range to $6.88 to $7. This range includes a negative impact from foreign exchange of approximately 4 percentage points using mid-April rates.

It is important to note that this guidance does not include the impact of the proposed acquisition of Prometheus, which is expected to close in the
third quarter of this year. We expect the transaction will result in a onetime charge that will increase research and development expense of
approximately $10.3 billion or approximately $4 per share. The impact of this charge will be reflected in both our GAAP and non-GAAP results. In
addition, ongoing investment to advance the pipeline assets as well as the cost of financing will negatively impact EPS by approximately $0.25 in
the first 12 months following close.

As Rob noted, we are very excited by Prometheus compelling science and confident that this transaction has the potential to create meaningful
value for patients and shareholders. Our guidance reflects our continued confidence in the underlying strength of our business, driven by our key
pillars in oncology, vaccines and Animal Health.

As you consider your models, there are a few items to keep in mind. In the U.S., KEYTRUDA has achieved exceptional growth over the past several
quarters driven by recent launches, particularly in early-stage indications, such as triple-negative breast cancer. While we continue to anticipate
growth from these earlier-stage indications, the year-over-year growth rate is expected to moderate as we anniversary their very strong initial
uptake. Outside the U.S., we continue to expect strong volume growth for KEYTRUDA. However, pricing is an increasing headwind, particularly as
we launch new indications in key European markets, which will temper ex-U.S. growth.

Finally, we are confident in our ability to drive strong growth of GARDASIL, particularly in international markets. We are well positioned to protect
many more people from HPV-related cancers now and over the long term. And given the strong global demand for the vaccine, we see an acceleration
of growth for GARDASIL in the full year 2023 relative to 2022 but not quite at the same level of growth achieved this quarter.

Now shifting to capital allocation, where we remain committed to our priority following the announcement to acquire Prometheus. We will continue
to prioritize investments in our business and growing pipeline to realize the value of the many near- and long-term opportunities we see. We
remain committed to our dividend and plan to increase it over time. Business development remains a high priority and we maintained the ability

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APRIL 27, 2023 / 1:00PM, MRK.N - Q1 2023 Merck & Co Inc Earnings Call

within our strong investment-grade credit rating to pursue additional science-driven, value-enhancing transactions going forward. We will continue
to execute a modest level of share repurchases this year.

To conclude, we remain very confident in the outlook of our business driven by the global demand for our innovative medicines and vaccines. We
are in a position of financial and operational strength and our continued excellent execution will enable us to deliver value to patients and
shareholders well into the future.

With that, I'd now like to turn the call over to Dean.

Dean Y. Li - Merck & Co., Inc. - Executive VP & President of Merck Research Laboratories
Thank you, Caroline. Hello, everyone. Today, I will provide notable updates since the last earnings call, starting with our progress in cardiovascular
disease, oncology, then infectious disease and subsequently, immunology with our recently announced acquisition of Prometheus.

As Rob mentioned earlier, at the American College of Cardiology in conjunction with the World Congress of Cardiology meeting in New Orleans,
results from the Phase III STELLAR trial, evaluating sotatercept for pulmonary arterial hypertension as well as data from the Phase IIb trial for our
oral PCSK9 inhibitor candidate, MK-0616 and in development for the treatment of hypercholesterolemia were presented. In the STELLAR study,
sotatercept in combination with stable background therapy met its primary endpoint with a substantial improvement in 6-minute walk distance
at 24 weeks compared to placebo in combination with background therapy. The trial also met 8 out of 9 secondary measures, including a compelling
reduction in time to clinical worsening or death versus placebo. These findings were published simultaneously in the New England Journal of
Medicine.

We are working diligently to submit filings from the STELLAR data to regulatory agencies. And at this time, anticipate filing in the U.S. in the third
quarter of this year, followed by the EU. We are advancing the broad sotatercept program, including the HYPERION, ZENITH, SOTERIA and Phase
II CADENCE trials which are actively recruiting. Also at the ACC meeting, detailed Phase IIb results for MK-0616 were presented showing a reduction
of LDL-cholesterol levels from 41.2%, up to 60.9% versus placebo. Up to 90% of patients receiving MK-0616 at the highest dose study were able to
reach their LDL-C goal.

An oral PCSK9 inhibitor could provide the opportunity for broad global access. We are initiating multiple Phase III studies, including in secondary
prevention intermediate to high-risk primary prevention and for patients with heterozygous familial hypercholesterolemia. In parallel, we will
conduct a cardiovascular outcomes trial. We are making progress towards our goal of developing medicines that improve and extend the lives of
patients with cardiovascular diseases and look forward to providing updates in the future.

Turning to oncology. As I have mentioned previously, a key area of focus and execution has been the development of treatment for early stages
of cancer where there remains significant unmet need. We announced FDA acceptance of our application for KEYTRUDA in combination with
platinum doublet chemotherapy as neoadjuvant followed by adjuvant therapy in patients with resectable Stage 2, 3A and 3B non-small cell lung
cancer based on the findings to date from the KEYNOTE-671 study. The agency has set a PDUFA action date of October 16 and detailed findings
will be presented at ASCO in June. Together with the approval of KEYTRUDA in the adjuvant setting for certain patients with non-small cell lung
cancer based on KEYNOTE-091, the KEYNOTE-671 study builds on the wealth of data we have generated, relevant additional ongoing studies
include KEYNOTE-867 and KEYLYNK-012. The comprehensive development program underscores our commitment to an area where there is
significant opportunity to improve patient outcomes. Importantly, it also reinforces the need for early detection through lung cancer screening.

At the American Association for Cancer Research Annual Meeting in collaboration with Moderna, we announced detailed results from KEYNOTE-942,
a Phase IIb study evaluating KEYTRUDA in combination with V940, also known as mRNA-4157, an individualized neoantigen therapy for the adjuvant
treatment of stage 3 and 4 melanoma in patients with high risk of disease occurrence following complete reception. These results are the first to
demonstrate improvement of recurrence-free survival over adjuvant standard of care PD-1 blockade in resected high-risk melanoma and provide
the first randomized evidence that an individualized neoantigen therapy has potential benefit. The FDA has granted this combination breakthrough
therapy designation and the European Medicine Agency has awarded prime designation for high-risk Stage 3 and 4 melanoma following complete
resection.

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APRIL 27, 2023 / 1:00PM, MRK.N - Q1 2023 Merck & Co Inc Earnings Call

Merck and Moderna plant initiated Phase III study in adjuvant melanoma this year and rapidly expand additional tumor types including non-small
cell lung cancer. Together with Astellas and Seagen, we announced the FDA's accelerated approval of KEYTRUDA in combination with enfortumab
vedotin an antibody drug conjugate for the treatment of adults with locally advanced or metastatic urothelial carcinoma who are not eligible for
cisplatin containing chemotherapy. This accelerated approval followed priority review and is based on data from the KEYNOTE-869 trial. This is an
important advancement as this is the first U.S. approval of a regimen combining an anti-PD-1 therapy with an antibody drug conjugate in these
patients. The approval adds to the success of our foundational work evaluating KEYTRUDA in combination with chemotherapy and provides
promising evidence for combining immunotherapy with tissue-targeted anticancer agents.

We are well positioned to build upon this work with a portfolio of next-generation antibody drug conjugate through our collaboration with
Kelun-Biotech. Planning is underway for an expansive global clinical development program, and we look forward to initiating Phase III trials for
MK-2870, our TROP2 targeting ADC as both monotherapy and in combination with KEYTRUDA. We also announced that the FDA has accepted our
application for KEYTRUDA in combination with chemotherapy for the first-line treatment of patients with HER2 negative locally advanced unresectable
or metastatic gastric or gastroesophageal junction adenocarcinoma. This filing is based on results from the Phase III KEYNOTE-859 trial in which
KEYTRUDA plus chemotherapy demonstrated a significant improvement in overall survival, reducing the risk of death by 22% compared to
chemotherapy alone in these patients regardless of PD-L1 expression. The agency has set a PDUFA action date of December 16. This provides us
the opportunity to expand upon our approval for patients with HER2-positive disease based on KEYNOTE-811.

We recently announced positive data from the Phase III NRG-GY018 trial, investigating KEYTRUDA in combination with chemotherapy for the
first-line treatment of patients with stage 3 to 4 or recurrent endometrial carcinoma. This is an important advancement for women with endometrial
cancer building on our approvals from KEYNOTE-146, 775 and 158.

Earlier this year, the American Cancer Society's 2023 Annual Report on cancer facts and trends noted that survival for uterine malignancies had not
improved over the past 4 decades due to a lack of treatment advances. We continue our work to provide better treatment options in women's
cancer.

And finally, the treatment of metastatic castrate-resistant prostate cancer remains a significant and growing unmet need and, therefore, an area
of ongoing commitment. We have gained important insights to date from our trials evaluating KEYTRUDA and Lynparza, and are planning to initiate
Phase III studies of MK-5684 a, novel oral nonsteroidal inhibitor of CYP-11A1 from our collaboration with Orion by the end of this year. Also with
AstraZeneca, we look forward to the discussion regarding the PROpel study at the upcoming Oncologic Drugs Advisory Committee meeting. We
are proud of the progress we are making and look forward to hosting an investor event at ASCO in Chicago. Please mark your calendars for the
evening of Monday, June 5, where we will provide an update on our oncology strategy and development program.

Turning to the progress of our infectious disease program. We are now actively enrolling multiple new Phase III studies for once daily islatravir in
combination with doravirine, and with Gilead have resumed the Phase II study of an oral once-weekly combination treatment regimen of islatravir
and Gilead lenacapavir. We are committed to advancing the science to offer new treatment options for the treatment of HIV.

On LAGEVRIO, we continue to prioritize global access during surges of COVID-19 around the world including in Japan, with the Ministry of Health,
Labor and Welfare recently granted full approval for the treatment of COVID-19. We are proceeding with the evaluation of LAGEVRIO for the
treatment of other viral respiratory infections and will show more as studies readout.

Finally, to our recently announced acquisition of Prometheus. Prometheus offers a strong scientific pedigree with a candidate that has shown
exciting potential in both ulcerative colitis and Crohn's disease. TNF-like 1A is a novel target, which provides the potential opportunity to transform
standard of care in a disease area where current therapies are often inadequate and high unmet need remains. Prometheus anti-TL1A antibody,
PRA023 is a potential first-in-class late-stage clinical candidate with a unique dual mechanism of action, including anti-inflammatory and anti-fibrotic
properties. PRA023 Phase II results in both ulcerative colitis and Crohn's disease demonstrated strong efficacy.

Further, at interim analysis, the data in the biomarker-positive subpopulation suggested even greater efficacy with patients more likely to achieve
clinical remission. By combining Prometheus, deep understanding of an inflammatory bowel disease and Merck's deep expertise in developing
and implementing biomarkers. We hope to usher in a new era in immunology where patients are matched with the right therapy based on a

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APRIL 27, 2023 / 1:00PM, MRK.N - Q1 2023 Merck & Co Inc Earnings Call

precision medicine approach. Prometheus biobank of IBD specimens have yielded deep molecular insights that form the foundation for the
discovery of PRA052, and we look forward to building on that knowledge to gain further insights, which will enable the identification and prioritization
of additional targets.

In closing, we continue to make progress towards our goal of creating innovative medicines that will improve the outcomes for patients. And now
I will turn the call back to Peter.

Peter Dannenbaum - Merck & Co., Inc. - VP of IR


Thank you, Dean. Michelle, we're ready for Q&A. I'd like to ask analysts to limit themselves to 1 question today. We'd like to complete the call by
the top of the hour. Thank you.

QUESTIONS AND ANSWERS


Operator
(Operator Instructions) Terence Flynn with Morgan Stanley.

Robert Ruzic - Morgan Stanley


This is Robert Ruzic on for Terence. You and your partner, Moderna are conducting a Phase I basket trial of the PCV. Can you elaborate on the design
of the trial and if you have any of the data in-house at this point?

Dean Y. Li - Merck & Co., Inc. - Executive VP & President of Merck Research Laboratories
Yes. Thank you. This is Dean. I probably want to just focus really on the Phase IIIs that we're advancing in melanoma and likely in others. There is a
basket trial that's going through to look at the extent of the tumors that a joint sort of KEYTRUDA plus a personalized or individualized neoantigen
therapy will work. I can just give you a general sense. We have a little bit of a road map as to where immune sensitive tumors are, and we would
likely prioritize those in our basket trial.

Peter Dannenbaum - Merck & Co., Inc. - VP of IR


Great. Thank you, next question, please.

Operator
Your next caller is Seamus Fernandez with Guggenheim.

Seamus Christopher Fernandez - Guggenheim Securities, LLC, Research Division - Senior Analyst of Global Pharmaceuticals
So my question is actually on the Kelun Bio opportunity. Dean, just hoping if you could update us, I believe, previously, it was stated that we may
see some longer-term data later this year. Just hoping to see if that is still the case or if competitive dynamics have kind of changed that commitment?
And maybe if you could just help us understand your enthusiasm for that particular product and where you feel it would be likely differentiated
from other products in the category?

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APRIL 27, 2023 / 1:00PM, MRK.N - Q1 2023 Merck & Co Inc Earnings Call

Dean Y. Li - Merck & Co., Inc. - Executive VP & President of Merck Research Laboratories
I'll just answer by the competitive dynamics make us more enthusiastic to push our programs harder and faster. We will be providing data from
the data that we have in a series of cancers at ASCO on June 5. We'll have an investor, but it will also be in the ASCO, I believe, already accepted for
our presentation there as well. So we're very interested in that. And we're also very interested in the fact that -- as we know, the first evidence of
anti-PD-1 with an antibody drug conjugates and our collaboration with Seagen has shown good effect, and we postulate that, that may be a broader
impact, not just with one ADC or one indication, but more broadly, through multiple antibody drug conjugates and therefore, our interest in
advancing not just the TROP2 ADC but many other ADCs that we haven't provided data as of this point.

Peter Dannenbaum - Merck & Co., Inc. - VP of IR


Okay. Next question, please.

Operator
Luisa Hector from Berenberg.

Luisa Caroline Hector - Joh. Berenberg, Gossler & Co. KG, Research Division - Co-Head of Global Pharmaceutical Team
I wondered if you could give us an update on KEYTRUDA. Your -- how it's looking in the adjuvant lung setting and relative positioning against your
competitor and how any subcutaneous formulation might change that either from the competitor or you? And when might we have that Phase
III data on your newer former of the subcutaneous?

Dean Y. Li - Merck & Co., Inc. - Executive VP & President of Merck Research Laboratories
Let me just grab the question about the early-stage lung. As we've talked, the earlier stages are really important. We've already seen it in triple-negative
breast cancer. We've seen it in RCC. We've seen it in melanoma. And I think the aperture of being able to do it in the lung is going to be substantial.
Again, for our KEYNOTE-671, which is the first perioperative trial to announce a statistically significant and clinically meaningful improvement in
EFS and statistically significant improvement in pathologic complete response. Those will be presented in June as well. I would also emphasize
that event-free survival and overall survival are the primary endpoints of our study, and most competitors do not have OS as a primary endpoint.

I would also emphasize that this is also in the setting where we have perioperative, but we also have adjuvant as well. So we provide a broad
treatment choice in relationship to moving forward in the earlier stage. In all earlier stage, whether it be lung, triple-negative, RCC, melanoma, I
think it will be increasingly important to provide innovation that allows patients to have "more normal" ability to stay on these treatments long
term, there are different profiles than a metastatic patient. And so we believe that giving other routes of administration will be important. And
we're advancing our subcu pembrolizumab, especially with hyaluronidase because that gives us an ability to do both a Q3 weeks and importantly,
also allows us to do a Q6 weeks because that frequency, I think, will be very important for patients.

Robert M. Davis - Merck & Co., Inc. - Chairman, President & CEO
And Luisa, I might just add from a commercial perspective, the early stage launch in lung with KEYNOTE-091 is off to a good start. We're actually
seeing good uptake. As you know, the challenge here is that the overall screening rates are lower. So it's going to be a slower climb than what we
saw, for instance, or we have been seeing with triple-negative breast cancer. But as we sit here today, the launch is going well. And as we look
forward, and hopefully, once we -- with the potential approval of KEYNOTE-671, we'll be the only company that has both adjuvant and neoadjuvant
offerings as well as, obviously, a leadership position in the metastatic setting.

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APRIL 27, 2023 / 1:00PM, MRK.N - Q1 2023 Merck & Co Inc Earnings Call

So as we sit here today, we continue to see this as a meaningful opportunity and long term will continue to drive growth for us in lung. But obviously,
we've got to get that going to do that in the adjuvant setting. From a metastatic perspective, we're continuing to hold our leadership position.

Peter Dannenbaum - Merck & Co., Inc. - VP of IR


Great. Thank you, Luisa. Next question, please.

Operator
Chris Shibutani with Goldman Sachs.

Chris Shibutani - Goldman Sachs Group, Inc., Research Division - Research Analyst
Great. For sotatercept, certainly, a broad scope of potential not just from the STELLAR results, but in earlier and later line, you have HYPERION and
ZENITH. Can you remind us if there's potential for interim readouts and if so, potential what time line? And relatedly, what are you thinking about
in terms of your overall sort of PH -- PAH strategy? You have assets now with Prometheus as well that have potential to be used in the systemic
sclerosis ILD population. A lot of opportunity. If you can just help frame some strategic thinking?

Dean Y. Li - Merck & Co., Inc. - Executive VP & President of Merck Research Laboratories
Yes. I would just focus on the pulmonary artery hypertension. I would kind of keep that a little bit distinct from other forms of lung disease, 1 is a
primary vascular. The other 1 is, I could say, primary parenchyma. So I kind of separate diseases like IPF and interstitial lung disease from scleroderma
as distinct from those like pulmonary artery hypertension. You're right. We believe that sotatercept will be important. We are pushing forward with
that sotatercept with a STELLAR. We have ZENITH, HYPERION. There are interim analysis, but I don't actually want to sort of lay out, many of them
are event-driven. The ZENITH, as you well know, is really in a more advanced situation and HYPERION is really trying to get it more in the front line.

We also believe that it will potentially reshape how people think about the treatment of PAH largely people thought about vasodilation or dilation.
I think this mechanism is active in signaling inhibitor with the mechanism that it has, which remodels, the tissue will reshape the field and in
reshaping it, it will potentially reshape the dynamics of the vasodilatory pathways and that's why we're so excited with our inhaled sGC program,
MK-5475 because we think that could be a very important combination agent with other vasodilatory mechanisms that are already approved as
well as in combination with sotatercept.

Peter Dannenbaum - Merck & Co., Inc. - VP of IR


Great. Thank you, Chris. Next question, please.

Operator
Chris Schott with JPMorgan.

Hardik K. Parikh - JPMorgan Chase & Co, Research Division - Research Analyst
This is Hardik Parikh filling in for Chris Schott. Just 1 question on the BD front. So when you're thinking about the progress that you guys have had
in internal pipeline and then now you have the Prometheus deal. Is there a priority or a bias when you consider business development from either
early or later stage deals or from therapeutic areas, oncology, CV or maybe some emerging therapeutic areas in your portfolio?

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APRIL 27, 2023 / 1:00PM, MRK.N - Q1 2023 Merck & Co Inc Earnings Call

Robert M. Davis - Merck & Co., Inc. - Chairman, President & CEO
Yes. No, I appreciate the question. So obviously, in our view of this is really unchanged despite what you've seen us do both recently and to the
fact you made -- point you made, we're seeing good progress in our internal pipeline. It starts with asking the question, where do we see the most
compelling science that we think we can use to make a difference for an unmet need and it has a strategic fit and where we see value aligned. And
that's where we move. As we sit here today, we continue to believe there are opportunities for us to continue to do business development. We are
very, I would say, pleased with the progress of the internal pipeline. And as you look about the therapeutic areas where we have been adding,
obviously, areas where you continue to see great science happening in oncology. There's a lot of science in oncology, immunology and we've seen
in cardiovascular.

So what's been driving us to the therapeutic areas has been the scientific opportunity we've seen. And as we think about early versus late, it really
will depend on the confidence the scientific team has and the particular opportunity. So we don't target one versus the other. Although I will tell
you, we continue to not believe that going after commercialized assets just for the sake of revenue is not our strategy. We're focused on building
the pipeline, both near and long term, and we do deals across the full spectrum. We talk about the acquisitions in the Phase II, Phase III area, but
we don't talk a lot about the fact we're doing a lot from collaborations and other licensing deals in their early phase. So we really look at the total
phase of development and always will be driven by the pipeline. If it brings with it a commercial opportunity, great, but it always will have to have
a pipeline element for us to want to go there.

Peter Dannenbaum - Merck & Co., Inc. - VP of IR


Great, thank you. Next question, please.

Operator
Carter Gould with Barclays.

Carter Lewis Gould - Barclays Bank PLC, Research Division - Senior Analyst
I guess for Rob and Caroline, would love to kind of hear your latest thoughts on sort of the EU proposed legislation and how that potentially changes
how you think about launching drugs in Europe? And I guess also, I guess the read-through would be also to how potential business development
as well? And as you think about the timing of the revenues and potentially shorter exclusivity periods? Any thoughts on that front would be helpful.

Robert M. Davis - Merck & Co., Inc. - Chairman, President & CEO
Yes. So if you look at what the EU just put out, obviously, the high-level message is overall on balance, we are concerned that it continues to put
innovation at a disadvantage in Europe and puts Europe at a competitive disadvantage as we think about where to invest our dollars and where
to bring new products. Now that said, on balance, there were elements of what were proposed that actually we support. There are elements that
we think need to be changed. On the side of the support, clearly, the fact that they have made some efforts to simplify and modernize the regulatory
framework, which has the potential to accelerate approvals. That was very much something the industry pushed for, and we feel good about. But
as you point out, the area that balances that, that is very concerning is the fact that they have reduced the data exclusivity period and made it
largely contingent upon you're launching in across the member states, whether or not you're doing comparative studies and whether or not you
have launches.

So we need to understand that. We're going to continue to try to make sure people understand the implications that can have as we think about
where we would launch products, and that's work we will do. We have a couple of years probably before this is put in place. So we have time to
do the negotiation. As I sit here today, I wouldn't say that I see specific implications to our business development strategy, it's more of just the

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APRIL 27, 2023 / 1:00PM, MRK.N - Q1 2023 Merck & Co Inc Earnings Call

general theme of what is a push against innovation that concerns us because Europe is an important market, getting access to our medicines to
the people in the European Union is important. We want to be there. We just have to make sure it's sustainable from a business perspective.

Peter Dannenbaum - Merck & Co., Inc. - VP of IR


Great. Thank you, Carter. Next question.

Operator
Tim Anderson with Wolfe Research.

Timothy Minton Anderson - Wolfe Research, LLC - MD of Equity Research


I have a question on GARDASIL in China. So the GFA contract from your Chinese distributor published a couple of months ago shows really big
purchase orders consistently for the next few years and it kind of trails off and declines. And it's interpreted literally it could suggest there was kind
of a bolus effect going on where growth isn't linear. It goes up for a while, then it contracts as you work through warehouse patients. Is that how
we should think about the longer-term uptake of GARDASIL in that particular market that it might not be linear?

Robert M. Davis - Merck & Co., Inc. - Chairman, President & CEO
Yes. Just -- so if you look at the Zhifei contract, it's important to understand that the levels put in that contract are minimums. And in fact, we have
shown and our history has been that actually we have supplied well over the minimum. So I wouldn't interpret that as the literal forecast of the
business in China because there's opportunities with the expanded age cohorts as we continue to drive penetration in what is still a large unmet
population, there is opportunities to do better than what's in that contract. And if history isn't indicative of the future, we would expect to see that
move forward. So I would not interpret that as implying a decline in GARDASIL in China over the coming years.

Caroline Litchfield - Merck & Co., Inc. - Executive VP & CFO


The only thing I would add is from a research perspective, we remain focused on studies in China to support gender-neutral vaccination, which
could be a great opportunity to protect more lives and provide growth into the future.

Peter Dannenbaum - Merck & Co., Inc. - VP of IR


Great. Thank you, Tim. Next question, please.

Operator
Evan Seigerman with BMO Capital Markets.

Malcolm Hoffman - BMO


This is Malcolm on for Evan. We wanted to ask with the sotatercept Phase III data, the Prometheus deal and novel assets like the oral PCSK9. Does
the team now think that this will be enough to grow through the KEYTRUDA LOE?

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APRIL 27, 2023 / 1:00PM, MRK.N - Q1 2023 Merck & Co Inc Earnings Call

Robert M. Davis - Merck & Co., Inc. - Chairman, President & CEO
Yes. I'll take the question, Malcolm. Obviously, I would start by saying we feel very good about the progress we've made in a very short period of
time. So if you look at the opportunity to be in a situation to have sustainable growth well into the next decade. We feel like we've made significant
progress. Whether it's -- as you point out, the deal with Acceleron and then I would add the broad and strong internal pipeline we have in
cardiovascular that as you know, we've indicated has 8 potential launches in the 24 to 28 time frame, which has the potential to generate more
than $10 billion as we move into the mid-2030s.

We talked about the fact from an oncology perspective. If you look at what we have from an ADC portfolio and a lot of the small molecules, we've
brought in through business development, excluding anything from the individualized neoantigen therapy, formally what we used to call the
personalized cancer vaccine with Moderna. So that's not even counted. We see greater than $10 billion of opportunity from those assets in that
same time frame.

So as we sit here today, we've made a lot of progress. I don't want to predict to I think we're in a position to grow or not. We're not giving specific
guidance. But I would say I feel, given the rate of progress we've made in such a short period of time and given the timetable we have and our
resources going forward and the progress that Dean is driving with his team in our labs, I am no longer focusing on 2028. I am looking at how do
we have sustainable growth well into the next decade.

Peter Dannenbaum - Merck & Co., Inc. - VP of IR


Great. Thank you. Next question, please.

Operator
Andrew Baum with Citi.

Andrew Simon Baum - Citigroup Inc., Research Division - Global Head of Healthcare Research and MD
Question for Dean. Could you talk to the planned cardiovascular outcome trial for your oral PCSK9 in particular, how you balance some of the
historic data supporting the idea that median trial treatment duration is closely tied to efficacy and the parenterals were probably dosed for too
short a time suggesting that you need to have a longer trial versus, on the other hand, the impact of the IRA containing returns at least in the
Medicare population in the U.S.?

Dean Y. Li - Merck & Co., Inc. - Executive VP & President of Merck Research Laboratories
Thank you very much for that question. First of all, I just want to emphasize that we're in active discussions with regulatory agencies in relationship
to our program as we define the Phase III trial. So that will put out there. The second point I would just emphasize is there is an evolving view that
I think the field is coming to grips with. It's not just that LDL is an excellent biomarker. It's not just that PCSK9 is an excellent pathway. It is the fact
that our 0616 interdicts exactly in the same place as some of the antibodies how one interprets that and how one thinks about biomarker data in
that setting, I think it will be an evolving discussion with the regulatory agencies.

The second question that you point out is the historic in the previous. I think you're referring to the fact that there is a view that if those studies
with the antibodies had gone out a little bit longer, that they would have had a more profound impact in terms of outcomes. Those are things that
we are speaking to the regulatory agencies as they think about the difference between the biomarker and the outcomes trial. But I do -- I would
echo your point of view, which is one doesn't want to go too short that one risks the full maximum impact that you can have on the label, but that,
as you said, needs to be balanced with whatever the IRI looks like how many years from now. So those are the balances. But your observation about
the other trials is one that we observed as well. And my general thinking is we should try to maximize the impact that we have on patients because
whatever that label is, that label will stay forever.

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APRIL 27, 2023 / 1:00PM, MRK.N - Q1 2023 Merck & Co Inc Earnings Call

Peter Dannenbaum - Merck & Co., Inc. - VP of IR


Thank you, Andrew. Next question, please.

Operator
Mara Goldstein with Mizuho.

Mara Goldstein - Mizuho Securities USA LLC, Research Division - MD of Equity Research Department
I wanted to also ask a question on the personalized cancer vaccine with Moderna. Coming out of AACR, the response rate for the monotherapy
arm, the KEYTRUDA arm seemed low relative to some of the sort of historical comparisons. And I'm wondering if you could speak to that, particularly
in light of what we have seen for other therapeutics that are being tested against KEYTRUDA monotherapy comparators?

Dean Y. Li - Merck & Co., Inc. - Executive VP & President of Merck Research Laboratories
Yes. So let me just state that it's always something that we do and everyone else does, which is this cross-trial comparison between companies,
but also within companies and their own agent. What I will say is that some of the issues that have been discussed was the pembrolizumab
monotherapy arm performed comparably to KEYNOTE-054 in the high-risk subgroups, which is 3C and D. and those were also included in the
KEYNOTE-942. And in general, the KEYNOTE-942 had more advanced disease than those in KEYNOTE-054. So there is a way for us to sort of
probabilitized given the same stage. So we're very comfortable with the pembrolizumab monotherapy arm in the trial that Merck and Moderna
proceeded with.

I just want to just reemphasize that this to us is an important development scientifically. This is really the first time that I can recall seeing the impact
of a personalized or individualized neoantigen therapy or a personalized cancer vaccine that has that profound of a readout in a Phase II. So we're
excited to advance that to Phase III for melanoma and to spool up other trials in Phase III as we look to see how far we can push this strategy.

Peter Dannenbaum - Merck & Co., Inc. - VP of IR


Thank you, Mara. Next question, please.

Operator
Umer Raffat with Evercore.

Umer Raffat - Evercore ISI Institutional Equities, Research Division - Senior MD & Senior Analyst of Equity Research
Dean, on TIGIT, we know the doublet arm was not going to meet the PFS. So by extension, the triplet may have a shot at meeting PFS. And my
question is, what is your confidence in getting to at least a 20% benefit or so on PFS? And if that plays out, you just wait for Phase III? Do you speak
to regulator? Like what happens next, considering the second line trial?

Dean Y. Li - Merck & Co., Inc. - Executive VP & President of Merck Research Laboratories
So I would just emphasize that I think you're speaking about the Phase II trial. And those Phase II trials do provide us sort of views of how to think
about the 5 Phase III trials that we have ongoing. I will just say that those 5 Phase III trials are going to be the thing that the FDA looks at. That's

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APRIL 27, 2023 / 1:00PM, MRK.N - Q1 2023 Merck & Co Inc Earnings Call

what they're going to look at and we're advancing those. And we're advancing them not just in metastatic situations. We have a series of them in
lung. But I also just want to emphasize something that I've said previously. It relates to what people have said about KEYNOTE-671. It relates to the
question about individualized neoantigen therapy, and it will relate here. When we think about IO strategies and especially IO plus IO strategies,
increasingly, our eyes are turning into the earlier stages of diseases both because it's very important for patients. It's a time where we can really
interdict early, but we also think that, that's an important place for us to relook on all of our assets that are IO-IO in that earlier stage.

Peter Dannenbaum - Merck & Co., Inc. - VP of IR


Thank you, Umer. Next question, please.

Operator
Daina Graybosch with SVB Securities.

Daina Michelle Graybosch - SVB Securities LLC, Research Division - Senior MD of Immuno-Oncology and Senior Research Analyst
Related to the previous 2 in your answer, Dean, in early-stage melanoma it looks like you're going to be pursuing 2 Phase III combinations in parallel,
adding on your TIGIT vivo and adding on the individualized neoantigen therapy. I wonder if you could talk to why you're taking 2 large shot on
goal in the same indication? And should we expect a similar strategy generally? And for these 2 add-ons specifically and other early-stage indications?

Dean Y. Li - Merck & Co., Inc. - Executive VP & President of Merck Research Laboratories
Yes. So I would just step back for just a moment. Our ability to go into earlier-stage cancers were just unlocked maybe a couple of years ago, right?
And in order to do combinations, it's very important that your base molecule actually has an impact because that allows you to do contributions
of components. So we're very comfortable moving our IO-IO strategies in earlier stages. We are doing it, as you said, both for pembro and TIGIT
and as well as pembro plus the individualized neoantigen therapy. We're very confident that the desire of patients to be there is substantial. And
our ability to recruit and do an important trial there is also important.

I would also say that as you see more readouts of earlier-stage cancer for any of our assets, whether it be Lynparza, whether it be an ADC or whether
it be KEYTRUDA, it will be likely that we will target multiple combinations in those spaces.

Peter Dannenbaum - Merck & Co., Inc. - VP of IR


Great. Thank you, Daina. We're going to try to get to 2 more questions, please.

Operator
Colin Bristow with UBS.

Yihan Li - UBS
This is Yihan on for Colin. Congrats on the quarter. So another question on KEYTRUDA. So how much of a protective strategy in terms of the
exclusivity could the subcutaneous formulation of the KEYTRUDA would afford you?

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APRIL 27, 2023 / 1:00PM, MRK.N - Q1 2023 Merck & Co Inc Earnings Call

Robert M. Davis - Merck & Co., Inc. - Chairman, President & CEO
Yes. So I appreciate the question. As we look at the subcutaneous formulation and where that can be utilized, obviously, it's focused more where
we have monotherapy as we look at earlier lines of therapy. So as we continue to advance our adjuvant and new adjuvant strategy across multiple
tumor types and then where we are combining KEYTRUDA with small molecules. Based on what we see, as we look out, we would expect about
half of what we have as KEYTRUDA would be addressable through the subcutaneous route based on that definition of those areas.

Peter Dannenbaum - Merck & Co., Inc. - VP of IR


Great. Thank you. Final question, please.

Operator
Trung Huynh with Credit Suisse.

Trung Chuong Huynh - Crédit Suisse AG, Research Division - Research Analyst
Just a quick one. Given your renewed interest in immunology, I just wanted to ask about gefapixant. GSK recently bought a product with a similar
mechanism of action for around $2 billion. They had described peak sales in the single billion dollar range. So perhaps can you just give us an
update of where gefapixant is post the CRL that you have? And what's your expectations for this opportunity?

Dean Y. Li - Merck & Co., Inc. - Executive VP & President of Merck Research Laboratories
Yes, I'll start with that. So as you recall, gefapixant, we had positive Phase III trials. We had a CRL. The CRL has nothing to do with the safety or really
any major concern that would require another clinical trial. The focus was on the way that the analysis was done and the way that costs were
counted. We have submitted additional analysis and will be submitting additional analysis to the FDA in the first half of this 2023. In general, I
believe that the timing is that on submission of all of that data, generally speaking, the FDA then readjusted CRL in -- within 6 months. We have it
already approved in Japan and Switzerland. And as you said, there is a renewed interest given the recent transaction, and I don't know if Caroline,
would you like to answer that?

Caroline Litchfield - Merck & Co., Inc. - Executive VP & CFO


So I would just add that today, this is a population that is very underserved, 1 in 10 people here in the United States have chronic cost. So it's a
market that will need to be built. But should we be successful with our work with the FDA, we look forward to bringing forward an option that will
be beneficial to patients and will drive revenue for our company.

Peter Dannenbaum - Merck & Co., Inc. - VP of IR


Great. Thank you, Trung, and thank you all for your very good questions today. We look forward to hearing from you and engaging with you in the
future. Thanks a lot.

Operator
Thank you. This concludes today's conference call. You may go ahead and disconnect at this time.

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