You should read the following discussion and analysis of our financial condition
and results of operations together with our unaudited condensed consolidated
financial statements and related notes appearing elsewhere in this Quarterly
Report on Form 10-Q. In addition to historical information, some of the
information contained in this discussion and analysis or set forth elsewhere in
this Quarterly Report on Form 10-Q contains forward-looking statements within
the meaning of Section 27A of the Securities Act of 1933, as amended, and
Section 21E of the Securities Exchange Act of 1934, as amended, and is subject
to the "safe harbor" created by those sections. All statements other than
statements of historical facts contained in this Quarterly Report on Form 10-Q,
including without limitation statements regarding: our financial performance,
including our expectations regarding our existing cash, operating losses,
expenses and sources of future financing; our ability to hire and retain
necessary personnel; patient enrollments and the timing thereof; the timing of
announcements regarding results of clinical trials; our ability to protect our
intellectual property; ongoing activities under and our ability to negotiate our
collaboration and license agreements, if needed, and the impact of termination;
our marketing, commercial sales, and revenue generation; expectations
surrounding our manufacturing arrangements; the impact of the novel coronavirus,
or COVID-19, pandemic on our business and operations and our future financial
results; and other statements identified by words such as "anticipates,"
"believes," "could," "estimates," "expects," "intends," "may," "might,"
"likely," "plans," "potential," "predicts," "projects," "seeks," "should,"
"target," "will," "would," or similar expressions and the negatives of those
terms are forward-looking statements.  These forward-looking statements are
neither promises nor guarantees of future performance, and are subject to a
variety of known and unknown risks and uncertainties, many of which are beyond
our control, and other important factors which could cause actual results to
differ materially from those contemplated in such forward-looking statements. We
discuss factors that we believe could cause or contribute to these differences
below and elsewhere in this report, including but not limited to those set forth
in Part II, Item 1A under the heading "Risk Factors" of this Quarterly Report on
Form 10-Q. Except as may be required by law, we have no plans to update our
forward-looking statements to reflect events or circumstances after the date of
this Quarterly Report on Form 10-Q. We caution readers not to place undue
reliance upon any such forward-looking statements, which speak only as of the
date made.

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Overview

We are a global, a commercial-stage biopharmaceutical company committed to
transforming the lives of patients and their families living with hyperphagia
and severe obesity caused by rare melanocortin 4 receptor (MC4R) pathway
diseases. Rhythm's precision medicine, IMCIVREE® (or setmelanotide), for which
we have exclusive worldwide rights, has the potential to restore dysfunctional
MC4R pathway signaling and MC4R pathway function. MC4R pathway deficiencies
result in the disruption of satiety signals and energy homeostasis in the body,
which, in turn, leads to intense feelings of hunger and to obesity. IMCIVREE is
the first-ever therapy developed for patients with hyperphagia and severe
obesity caused by certain rare MC4R pathway diseases that is approved or
authorized in the United States, European Union (EU) or Great Britain. In the
United States, IMCIVREE is approved for chronic weight management in adult and
pediatric patients 6 years of age and older with monogenic or syndromic obesity
due to pro-opiomelanocortin (POMC), proprotein convertase subtilisin/kexin type
1 (PCSK1) or leptin receptor (LEPR) deficiency as determined by a U.S. Food and
Drug Administration (FDA)-approved test demonstrating variants in POMC, PCSK1 or
LEPR genes that are interpreted as pathogenic, likely pathogenic, or of
uncertain significance, or Bardet-Biedl syndrome (BBS). The European Commission
(EC) has authorized setmelanotide for the treatment of obesity and the control
of hunger associated with genetically confirmed BBS or genetically confirmed
loss-of-function biallelic POMC, including PCSK1, deficiency or biallelic LEPR
deficiency in adults and children 6 years of age and above. The UK's Medicines &
Healthcare Products Regulatory Agency (MHRA) authorized setmelanotide for the
treatment of obesity and the control of hunger associated with genetically
confirmed loss-of-function biallelic POMC, including PCSK1, deficiency or
biallelic LEPR deficiency in adults and children 6 years of age and above. We
have achieved market access for IMCIVREE in France, Germany and Great Britain,
and we expect to secure market access in Italy and the Netherlands in the fourth
quarter of 2022. In addition to United States, EU and UK, we and our partners
are seeking approval and market access for IMCIVREE to treat patients with these
MC4R pathway-related obesities in Argentina and Israel.

We also are advancing a broad clinical development program evaluating
setmelanotide in several ongoing clinical trials, and we are leveraging what we
believe is the largest known DNA database focused on obesity - with
approximately 45,000 sequencing samples as of December 31, 2021 - to improve the
understanding, diagnosis and care of people living with severe obesity due to
certain variants in genes associated with the MC4R pathway. In April 2022, we
enrolled the first patient in the pivotal Phase 3 EMANATE clinical trial, a
randomized, double-blind, placebo-controlled trial to evaluate setmelanotide in
four independent sub-studies in patients with obesity due to a heterozygous
variant of the POMC/PCSK1 genes or LEPR gene or certain rare variants of the
SRC1 gene or the SH2B1 gene. We also have initiated the Phase 2 DAYBREAK
clinical trial designed to evaluate setmelanotide in patients who carry a
confirmed variant in one or more of 10 additional genes with strong or very
strong relevance to the MC4R pathway. In November 2022, we announced plans to
initiate a pivotal, Phase 3 trial to evaluate setmelanotide in patients with
hypothalamic obesity in early 2023. In addition, our broad clinical programs
evaluating setmelanotide in rare MC4R pathway diseases include the ongoing Phase
3 study in pediatric patients with MC4R pathway deficiencies between the ages of
2 and 6 years old, and a potential registration-enabling study with our
once-weekly formulation of setmelanotide. Additionally, as an FDA post-marketing
requirement, we are currently evaluating the effects of setmelanotide on the QT
interval corrected for heart rate, or QTc interval, in healthy volunteers.

There are currently no effective or approved treatments for these MC4R pathway
related diseases. The FDA has acknowledged the importance of these results by
giving setmelanotide Breakthrough Therapy designation for the treatment of
obesity associated with genetic defects upstream of the MC4R in the leptin
melanocortin pathways. The Breakthrough Therapy designation currently covers
indications for POMC deficiency obesity, LEPR deficiency obesity, BBS and, as of
November 2022, hypothalamic obesity.

Additional recent clinical, regulatory and commercial updates include:


On November 8, 2022, we announced that, as of September 30, 2022, more than 80
physicians have written more than 120 prescriptions for IMCIVREE for patients
with BBS since IMCIVREE was approved by the FDA. We have secured approval for
reimbursement for more than 40 of those prescriptions.

On November 2, 2022, we also announced the design of our Phase 3 clinical trial
in acquired hypothalamic obesity following recent discussions with the FDA. The
trial, which is anticipated to initiate in early 2023, is expected to enroll

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120 patients randomized 2:1 to setmelanotide therapy or placebo for 60 weeks,
including up to 8 weeks for dose titration. The primary endpoint will be the
percent change in body mass index (BMI) versus placebo. Key secondary endpoints
will include the proportion of patients who achieve ?5% reduction in BMI from
baseline in adults (?18) or BMI Z-score reduction of ?0.2 from baseline in
pediatrics at Week 60 compared with placebo; and mean change in the weekly
average of the daily most hunger score in patients ?12 years from baseline to
Week 60 compared with placebo.

At The Obesity Society's ObesityWeek® 2022 conference held November 1-4, 2022 in San Diego, California, we and our collaborators delivered 11 presentations. Highlights from the presentations include:

Positive full dataset from our Phase 2 trial evaluating setmelanotide for the

treatment of hypothalamic obesity demonstrating that 89% percent (16 of 18)

? patients had a 5% or greater reduction in BMI at 16 weeks; 14.5 mean percent

reduction in BMI and 12.6 mean percent reduction body weight (N=18) at Week 16


   from baseline;


   Additionally, we reported that 14 patients continued on therapy in our

long-term extension trial. As of a cut-off date of September 23, 2022, 13 of

? these patients who reached a total of 29 weeks on setmelanotide therapy

achieved a mean BMI reduction of 21.1% (SD, 11.2%); and five (5) of these

patients who reached a total of 41 weeks on setmelanotide therapy achieved a


   mean BMI reduction of 26.7% (SD, 12.4%).


   Results from the Clinical Registry Investigating Bardet-Biedl Syndrome

(CRIBBS): We also presented results from CRIBBS, the international registry of

patients with BBS that launched in 2014. We collaborated with the Marshfield

Clinic Research Institute on multiple analyses of blinded CRIBBS data. The

? results demonstrated that children with BBS experience high disease burden due

to hyperphagia and that hyperphagia was positively correlated with higher BMI

weight categories. Obesity was found to be highly prevalent in a large sample

of children with BBS, and most children who had obesity continued to have it or

experienced worsening weight gain over time.




On November 1, 2022, we also announced that the FDA has granted Breakthrough
Therapy designation to setmelanotide for the treatment of hypothalamic obesity.
The FDA's Breakthrough Therapy designation is designed to expedite development
and review of medicines that aim to address a serious condition with preliminary
clinical evidence indicating that the drug may demonstrate substantial
improvement over existing treatments on one or more clinically significant
endpoints.

On October 12, 2022, we announced our sponsorship of the inaugural International
Meeting on Pathway-Related Obesity: Vision of Excellence (IMPROVE) 2022 in
Berlin, Germany, bringing together approximately 100 specialists to share the
latest scientific developments and patient care practices related to rare MC4R
pathway-related obesities.

Also on October 12, 2022 at IMPROVE, we announced data from our exploratory
Phase 2 Basket Study evaluating setmelanotide in patients stratified into two
cohorts, one with predicted setmelanotide rescuable MC4R pathway deficiency and
one with predicted nonrescuable MC4R deficiency.

On October 6, 2022, we announced the appointment of Dana Washburn, M.D., as Senior Vice President of Clinical Development and as a member of our Executive Leadership Team to lead our robust clinical development program, clinical operations, and data management.

On September 23, 2022, we announced the publication of a children's book developed in collaboration with the BBS Foundation entitled, "Understanding Hunger & Bardet-Biedl Syndrome (BBS): Gabe's Story."



On September 19, 2022, we completed a public offering of 4,800,000 shares of
common stock at a price to the public of $26.00 per share for aggregate net
proceeds to us of $117.0 million, after deducting underwriting discounts and
commissions and offering expenses payable by us.  On October 18, 2022, we
completed the sale of an additional 580,000 shares of common stock at a price to
the public of $26.00 per share pursuant to the partial exercise of the
underwriters'

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option to purchase additional shares, for aggregate net proceeds to us of approximately $131.2 million, after deducting underwriting discounts, commissions and offering expenses payable by us.



On September 19, 2022, we announced presentations during the 60th Annual Meeting
of the European Society for Paediatric Endocrinology (ESPE 2022) held in Rome,
Italy that detailed new findings on the burden of hyperphagia and obesity on
patients with BBS and their caregivers and data from new analyses that showed
setmelanotide achieved substantial weight loss benefit in adolescent and
pediatric patients with rare MC4R pathway diseases across three separate pivotal
trials.

On September 6, 2022, we announced that the EC has expanded the marketing
authorization for IMCIVREE to include the treatment of obesity and control of
hunger associated with genetically confirmed BBS in adult and pediatric patients
6 years of age and older.

Also on September 6, 2022, we announced that Health Canada granted Priority
Review for our New Drug Submission (NDS) for setmelanotide, indicated in adult
and pediatric patients 6 years of age and older with impairments in the MC4R
pathway due to genetic diseases, for the treatment of obesity and control of
hunger in BBS or biallelic POMC, PCSK1, LEPR deficiency. Priority Review
shortens Health Canada's submission review performance target to 180 days, in
comparison to 300 days for non-Priority Review.

In addition, we reported that we expect to achieve the following near-term milestones:

? Launch IMCIVREE in Italy and the Netherlands for patients with POMC, PCSK1 or

LEPR deficiencies in the fourth quarter of 2022;

? Initiate pivotal Phase 3 trial to evaluate setmelanotide in hypothalamic

obesity in early 2023;

Initiate a Phase 3, randomized, double-blind trial in patients naïve to

? setmelanotide therapy ("de novo study") to evaluate the weekly formulation of

setmelanotide in patients with BBS in the first half of 2023;

Complete regulatory review by Health Canada and, pending approval, make

? IMCIVREE commercially available in Canada for the treatment of obesity and

control of hunger in adults and pediatric patients 6 years and older with BBS,

or with POMC, PCSK1 or LEPR deficiencies in 2023; and

Announce topline data from our Phase 3, open-label trial evaluating one year of

? setmelanotide therapy in pediatric patients with MC4R pathway deficiencies

between the ages of 2 and 6 years old in the second half of 2023.




Our operations to date have been limited primarily to conducting research and
development activities for setmelanotide. To date, we have generated less than
$15.0 million of revenue from product sales and we have financed our operations
primarily through the proceeds received from the sales of common and preferred
stock, asset sales, as well as capital contributions from the former parent
company, Rhythm Holdings LLC. From August 2015 through August 2017, we raised
aggregate net proceeds of $80.8 million through our issuance of series A
preferred stock.  Since our initial public offering, or IPO, on October 10, 2017
and our underwritten follow-on offerings through October 2022, we have raised
aggregate net proceeds of approximately $742.6 million through the issuance of
our common stock after deducting underwriting discounts, commissions and
offering related transaction costs. We also received $100.0 million from an
asset sale, specifically in connection with the sale of our PRV. In December
2021, we entered into an Exclusive License Agreement with RareStone Group Ltd.,
and received $7.0 million in connection with the execution of that agreement.
 In June 2022, we entered into the RIFA (as defined below) with entities managed
by HealthCare Royalty and received cumulative proceeds of $74.8 million, net of
certain transaction costs at closing.

We will not generate significant revenue from product sales until we are able to successfully establish a marketing and commercialization infrastructure for IMCIVREE. IMCIVREE became commercially available to patients 6 years of



                                       24

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age and older with obesity due to POMC, PCSK1 or LEPR deficiency in the U.S. in
the first quarter of 2021 and patients 6 years of age and older with obesity due
to BBS during June 2022. Following marketing authorizations in the EU and Great
Britain, we are pursuing a country-by-country strategy to establish market
access and reimbursement for IMCIVREE in several countries. During March 2022,
we treated the first patients with IMCIVREE in France under the paid early
access program and we treated the first patients with IMCIVREE in Germany during
June 2022. We expect to continue to fund our operations through the sale of
equity, debt financings or other sources. We intend to build our own marketing
and commercial sales infrastructure and we may enter into collaborations with
other parties for certain markets outside the United States. However, we may be
unable to raise additional funds or enter into such other arrangements when
needed on favorable terms, or at all. If we fail to raise capital or enter into
such other arrangements as, and when, needed, we may have to significantly
delay, scale back or discontinue the development or commercialization of
setmelanotide.

As of September 30, 2022, we had an accumulated deficit of $667.6 million. Our
net losses were $40.9 million, $35.1 million, $138.6 million, and $26.7 million
for the three and nine months ended September 30, 2022 and 2021, respectively.
We expect to continue to incur significant expenses and increasing operating
losses over the foreseeable future. We expect our expenses will increase
substantially in connection with our ongoing activities, as we:

? continue to conduct clinical trials for setmelanotide;

? engage contract manufacturing organizations, or CMOs, for the manufacture of

clinical and commercial-grade setmelanotide;

? seek regulatory approval for setmelanotide for additional indications;

? expand our clinical, regulatory, commercial and corporate infrastructure and

expand operations globally;

? engage in the sales and marketing efforts necessary to support the continued

commercial efforts of IMCIVREE globally;

? take into account the levels, timing and collection of revenue earned from

sales of IMCIVREE and other products approved in the future, if any; and

? continue to operate as a public company.




As of September 30, 2022, our existing cash and cash equivalents and short-term
investments were approximately $347.8 million. We expect that our previously
announced changes to the EMANATE and DAYBREAK trials, coupled with a
streamlining of our planned global network of clinical trial sites, will result
in meaningful cost savings. We expect that our existing cash and cash
equivalents and short-term investments will be sufficient to fund our operations
into 2025.

Corporate Background

We are a Delaware corporation organized in February 2013 under the name Rhythm Metabolic, Inc., and as of October 2015, under the name Rhythm Pharmaceuticals, Inc.

Impact of COVID-19


We are closely monitoring how the continued spread of COVID-19 is affecting our
employees, business, preclinical studies and clinical trials. In response to the
COVID-19 pandemic, we have limited access to our executive offices with most
employees continuing their work outside of our offices and travel has been
restricted.  Based on current information we do not currently anticipate any
disruption in the clinical supply of setmelanotide. Our CMOs have indicated that
they have appropriate plans and procedures in place to ensure uninterrupted
future supply of clinical and commercial-grade setmelanotide, subject to
potential limitations on their operations due to COVID-19.  As a result, we do
not currently expect that the COVID-19 pandemic will have a material impact on
our business, results of operations and financial condition. At this time,
however, there is still uncertainty relating to the trajectory of the pandemic
and the impact of

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related responses, and disruptions caused by the COVID-19 pandemic have resulted
and may in the future result in difficulties or delays in initiating, enrolling,
conducting or completing our planned and ongoing clinical trials and the
incurrence of unforeseen costs as a result of disruptions in clinical supply or
preclinical study or clinical trial delays. For example, in 2020, we experienced
interruption of key clinical trial activities, such as patient attendance and
clinical trial site monitoring, in our Phase 3 clinical trial evaluating
setmelanotide for the treatment of insatiable hunger and severe obesity in
individuals with BBS or Alström syndrome. The impact of COVID-19 on our future
results will largely depend on future developments, which are highly uncertain
and cannot be predicted with confidence, such as the duration of the pandemic,
the impact of variants, evolving travel restrictions and social distancing in
the United States and other countries, business closures or business
disruptions, the ultimate impact on financial markets and the global economy,
the effectiveness of vaccines and vaccine distribution efforts and the
effectiveness of other actions taken in the United States and other countries to
contain and treat the disease. See "Risk Factors-The COVID-19 pandemic has and
may continue to adversely impact our business, including our preclinical
studies, clinical trials and our commercialization prospects." in Part II, Item
1A of this Quarterly Report on Form 10-Q.

Financial Operations Overview

Revenue


To date, we have generated less than $15.0 million of revenue from product
sales.  Our lead product candidate, IMCIVREE, was approved by the FDA in
November 2020 for chronic weight management in adult and pediatric patients six
years of age and older with obesity due to POMC, PCSK1 or LEPR deficiency
confirmed by genetic testing. IMCIVREE became commercially available in the
United States in the first quarter of 2021.  We recorded our first sales of
IMCIVREE in the United States in March 2021 and we made our first sales in
France during March 2022 under the paid early access program.  IMCIVREE was
approval by the FDA and the EC in adult and pediatric patients six years of age
and older with obesity due to BBS in June and September of 2022, respectively.

Following these approvals for BBS, we expect our sales of IMCIVREE will continue to grow as we identify and treat more patients with this disease and obtain reimbursement throughout the international markets in which we operate.

Cost of sales



All of our inventory of IMCIVREE produced prior to FDA approval is available for
commercial or clinical use.  Most of the manufacturing costs have been recorded
as research and development expenses in prior periods.  Accordingly, the costs
for IMCIVREE included in our cost of sales for the three and nine months ended
September 30, 2022 were insignificant.  We expect cost of sales to increase in
2022 as we continue to sell inventory that is produced after we began
capitalizing IMCIVREE commercial inventory.  We continue to evaluate the impact
of this previously expensed inventory on the future cost of product sales,
however we do not expect there to be a significant impact based on the cost
structure of the product.

Research and development expenses

Research and development expenses consist primarily of costs incurred for our research activities, including our drug discovery and genetic sequencing efforts, and the clinical development of setmelanotide, which include:

expenses incurred under agreements with third parties, including CROs that

? conduct research and development and preclinical activities on our behalf, and

the cost of consultants and CMOs that manufacture drug products for use in our

preclinical studies and clinical trials;

? employee-related expenses including salaries, benefits and stock-based

compensation expense;

? the cost of lab supplies and acquiring, developing and manufacturing

preclinical and clinical study materials;

? the cost of genetic sequencing of potential patients in clinical studies; and




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? facilities, depreciation, and other expenses, which include rent and

maintenance of facilities, insurance and other operating costs.

We expense research and development costs to operations as incurred. Nonrefundable advance payments for goods or services to be received in the future for use in research and development activities are recorded as prepaid expenses. The capitalized amounts are expensed as the related goods are delivered or the services are performed.



The following table summarizes our current research and development expenses:

                                      Three Months Ended        Nine Months Ended
                                        September 30,            September 30,

Research and development summary 2022 2021 2022

2021

Research and development expense $ 21,116 $ 27,539 $ 85,082 $ 72,554




We are unable to predict the duration and costs of the current or future
clinical trials of our product candidates. The duration, costs, and timing of
clinical trials and development of setmelanotide will depend on a variety of
factors, including:

? the scope, rate of progress, and expense of our ongoing, as well as any

additional, clinical trials and other research and development activities;

? the rate of enrollment in clinical trials;

? the safety and efficacy demonstrated by setmelanotide in future clinical

trials;

? changes in regulatory requirements;

? changes in clinical trial design; and

? the timing and receipt of any regulatory approvals.

A change in the outcome of any of these variables with respect to the development of our product candidates would significantly change the costs and timing associated with its development and potential commercialization.



Research and development activities are central to our business model. Product
candidates in later stages of clinical development generally have higher
development costs than those in earlier stages of clinical development,
primarily due to the increased size and duration of later-stage clinical trials.
We expect research and development costs to increase significantly for the
foreseeable future as our setmelanotide and other development programs progress.
However, we do not believe that it is possible at this time to accurately
project total program-specific expenses to commercialization and there can be no
guarantee that we can meet the funding needs associated with these expenses.

Selling, general and administrative expenses



Selling expenses consist of professional fees related to preparation for the
commercialization of setmelanotide, as well as salaries and related benefits for
commercial employees, including stock-based compensation.  As we implement and
execute our commercialization plans and start to market setmelanotide and as we
explore new collaborations to develop and commercialize setmelanotide, we
anticipate that these expenses will materially increase.

General and administrative expenses consist primarily of salaries and other
related costs, including stock-based compensation, relating to our full-time
employees not involved in R&D or commercial activities.  Other significant costs
include rent, legal fees relating to patent and corporate matters and fees for
accounting, tax and consulting services.

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The following table summarizes our current selling, general and administrative
expenses:

                                                       Three Months Ended        Nine Months Ended
                                                         September 30,            September 30,

Selling, general and administrative summary             2022         2021        2022         2021
Selling, general and administrative expense          $   21,938    $ 17,507

$ 65,715 $ 47,490




We anticipate that our selling, general and administrative expenses will
increase in the future to support continued and expanding development efforts,
commercialization of IMCIVREE in the United States and the European Union as
well as increased costs of operating as a global commercial stage
biopharmaceutical public company. These increases will likely include increased
costs related to the hiring of additional personnel and fees to outside
consultants, lawyers and accountants, compliance with local rules and
regulations in the United States and foreign jurisdictions, exchange listing and
Securities and Exchange Commission (SEC) expenses, insurance and investor
relations costs, among other expenses.

Critical Accounting Policies and Estimates



Our management's discussion and analysis of our financial condition and results
of operations are based on our financial statements, which we have prepared in
accordance with accounting principles generally accepted in the United States,
or GAAP. The preparation of these financial statements requires us to make
estimates and assumptions that affect the reported amounts of assets and
liabilities and the disclosure of contingent assets and liabilities at the date
of the financial statements, as well as the reported amounts of revenues and
expenses during the reporting periods.  These items are monitored and analyzed
by us for changes in facts and circumstances on an ongoing basis, and material
changes in these estimates could occur in the future.  We base our estimates on
historical experience and on various other factors that we believe are
reasonable under the circumstances, the results of which form the basis for
making judgments about the carrying value of assets and liabilities that are not
readily apparent from other sources. Actual results may differ from these
estimates under different assumptions or conditions.

There were no significant changes to our critical accounting policies as reported in our Annual Report on Form 10-K for the fiscal year ended December 31, 2021.



Results of Operations

Comparison of the three months ended September 30, 2022 and 2021



The following table summarizes our results of operations for the three months
ended September 30, 2022 and 2021, together with the changes in those items

in
dollars and as a percentage:

                                           Three Months Ended
                                             September 30,                 Change
                                           2022          2021           $           %

                                                         (in thousands)
Statement of Operations Data:
Product revenue, net                    $    4,284    $    1,028    $   3,256        317 %
Costs and expenses:
Cost of sales                                  497           222          275        124 %
Research and development                    21,116        27,539      (6,423)       (23) %
Selling, general, and administrative        21,938        17,507        4,431         25 %
Total costs and expenses                    43,551        45,268      (1,717)        (4) %
Loss from operations                      (39,267)      (44,240)        4,973       (11) %
Other (expense) income, net                (1,594)           138      (1,732)    (1,255) %
Loss before taxes                         (40,861)      (44,102)        3,241        (7) %
Benefit from income taxes                        -       (8,995)        8,995      (100) %
Net loss                                $ (40,861)    $ (35,107)    $ (5,754)         16 %


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NM=Not meaningful

Product revenue, net.  Product revenue, net increased by $3.3 million to
$4.3 million for the three months ended September 30, 2022 from $1.0 million for
the three months ended September 30, 2021, an increase of 317%.  The FDA
approved our lead product candidate, IMCIVREE in November 2020 and we recorded
our first sales of IMCIVREE in March 2021. We expect our sales of IMCIVREE to
continue to increase following the FDA approval for the treatment of patients
with BBS in the United States during June 2022 and by the EC in September 2022.
 Through September 30, 2022, a substantial amount of our product revenue, or
81%, has been generated in the United States.  During March 2022, we completed
our first sales of IMCIVREE in France through an early access program. During
June 2022, we completed our first sales of IMCIVREE in Germany.

Cost of sales. Cost of sales increased by $0.3 million to $0.5 million for the
three months ended September 30, 2022 from $0.2 million for the three month
period ended September 30, 2021.  All of our inventory of IMCIVREE produced
prior to FDA approval is available for commercial or clinical use.  Most of the
manufacturing costs have been recorded as research and development expenses in
prior periods.  Accordingly, the costs for IMCIVREE included in our cost of
sales for the three months ended September 30, 2022 and 2021 were insignificant
and primarily reflect the amortization of our capitalized sales based milestone
payment made to Ipsen Pharma S.A.S., or Ipsen, upon our first commercial sale in
the United States and European Union, as well as a royalty due to Ipsen on our
net product sales.  We expect cost of sales to increase over time as we sell
inventory that is produced after we began capitalizing IMCIVREE commercial
inventory.

Research and development expense. Research and development expense decreased by
$6.4 million to $21.1 million in 2022 from $27.5 million in 2021, a decrease of
23%. The decrease was primarily due to the following:

a decrease of $5.2 million in our clinical trial costs associated with the

impact of study design amendments to our Phase 2 DAYBREAK study, as well as,

? reduced activity due to the winding down of our BBS, QT, Phase 2 Basket and

renal studies; these decreases were partially offset by increased costs

associated with our Phase 3 EMANATE trials, and increased enrollment in our

long-term extension study;

? a decrease of $1.3 million in costs associated with the manufacturing of

clinical material;

? a decrease of $0.5 million of costs related to next generation research and

development activities;

? a decrease of $0.4 million in costs associated with medical affairs; and

? a decrease of $0.3 million in compensation and benefits.

The above decreases were partially offset by:

? an increase of $1.2 million due to increased gene sequencing costs to support

our expanded clinical programs.




Selling, general and administrative expense. Selling, general and administrative
expense increased by $4.4 million to $21.9 million in 2022 from $17.5 million in
2021, an increase of 25%. The increase was primarily due to the following:

an increase of $2.2 million due to increased compensation and benefits related

? costs associated with additional headcount to support our expanding business

operations as well as to build out our commercial operations in the United

States and internationally;

an increase of $1.6 million due to increased costs associated with insurance

? premiums, office support, travel and entertainment related costs for our

expanding workforce and increased commercial operations; and




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an increase of $0.7 million related to increased costs associated with sales

? and marketing activities for IMCIVREE in connection with preparing for the EC

approval for BBS obtained in September 2022 and expanding our international

market access.

The above increases were partially offset by:

? a decrease of $0.4 million related to professional services costs.


Other (expense) income, net.  Other (expense) income, net decreased by $1.7
million to ($1.6) million for the three months ended September 30, 2022. Other
(expense) income, net consists of ($2.1) million of interest expense related to
our RIFA with HealthCare Royalty Partners, LLC and a  ($1.0) million write off
expense related to our RareStone equity partially offset by $1.0 million of
interest income primarily due to improving interest rates during the period and
$0.7 million fair market value adjustment related to our RIFA embedded
derivative.

(Benefit from) provision for income taxes.  There is no provision for income
taxes for the three months ended September 30, 2022, as we project to generate
operating losses during the year.  We recorded an income tax benefit of $9.0
million as a result of the reversal of a tax provision recorded upon the sale of
our PRV during the three months ended September 30, 2021.

Net loss. Net loss increased by $5.8 million to $40.9 million for the three
months ended September 30, 2022, from net loss of $35.1 million for the three
months ended September 30, 2021. The increase in net loss was a result of higher
costs as noted above, offset by current period revenues, and the non-recurring
nature of the impact of a tax benefit related to the sale of our PRV in the
prior year period.

Comparison of the nine months ended September 30, 2022 and 2021



The following table summarizes our results of operations for the nine months
ended September 30, 2022 and 2021, together with the changes in those items

in
dollars and as a percentage:

                                            Nine Months Ended
                                              September 30,                 Change
                                           2022           2021             $         %

                                                         (in thousands)
Statement of Operations Data:
Product Revenue, net                    $     8,094    $     1,337    $     6,757    505 %
License revenue                               6,754              -          6,754     NM
Costs and expenses:
Cost of sales                                 1,105            363            742    204 %
Research and development                     85,082         72,554         12,528     17 %

Selling, general, and administrative         65,715         47,490        

18,225     38 %
Total costs and expenses                    151,902        120,407         31,495     26 %
Loss from operations                      (137,054)      (119,070)       (17,984)     15 %
Other (expense) income, net                 (1,572)        100,313      (101,885)  (102) %
Loss before taxes                         (138,626)       (18,757)      (119,869)    639 %
Provision for income taxes                        -          7,989        (7,989)  (100) %
Net loss                                $ (138,626)    $  (26,746)    $ (111,880)    418 %


NM=Not meaningful

Product revenue, net.  Product revenue, net increased by $6.8 million to
$8.1 million for the nine months ended September 30, 2022 from $1.3 million for
the nine months ended September 30, 2021, an increase of 505%.  The FDA approved
our lead product candidate, IMCIVREE in November 2020 and we recorded our first
sales of IMCIVREE in March 2021. We expect our sales of IMCIVREE to continue to
increase following the FDA approval for the treatment of

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patients with BBS in the United States during June 2022 and by the EC during
September 2022.  Through September 30, 2022, substantially all of our product
revenue, or 86%, has been generated in the United States.  During March 2022, we
completed our first sales of IMCIVREE in France through an early access program.
During June 2022, we completed our first sales of IMCIVREE in Germany.

License revenue.  License revenue was $6.8 million for the nine months ended
September 30, 2022 and was entirely related to the RareStone license.  We
entered into a license agreement with the RareStone in December 2021 and
completed our activities required to transfer the license to RareStone during
the second quarter of 2022, which resulted in the recognition of the license
revenue.  We do not expect to recognize additional license revenue related to
the RareStone arrangement during 2022.

Cost of sales. Cost of sales increased by $0.7 million to $1.1 million for the
nine months ended September 30, 2022 from $0.4 million in the nine months ended
September 30, 2021, an increase of 204%.  Most of the IMCIVREE manufacturing
costs have been recorded as research and development expenses in prior periods.
 Accordingly, the product cost component related for IMCIVREE included in our
cost of sales for the nine months ended September 30, 2022 were insignificant
and cost of sales primarily reflect the amortization of our capitalized sales
based milestone payment made to Ipsen Pharma S.A.S., or Ipsen, upon our first
commercial sale in the United States and European Union, as well as a royalty
due to Ipsen on our net product sales.  The $0.7 million increase in cost of
sales was due to an increase of $0.3 million of additional amortization, $0.3
million of additional royalties due to our growth in sales and $0.1 attributed
to product cost primarily associated with higher sales volume.  We expect cost
of sales to increase overtime as we sell inventory that is produced after we
began capitalizing IMCIVREE commercial inventory.

Research and development expense. Research and development expense increased by
$12.5 million to $85.1 million in the nine months ended September 30, 2022 from
$72.6 million in the nine months ended September 30, 2021, an increase of 17%.
The increase was primarily due to the following:

an increase of $8.8 million in our clinical trial costs associated with new and

planned clinical trials, including our Phase 2 DAYBREAK and Phase 3 EMANATE

? trials, Phase 3 pediatrics trial, QTc study, Phase 2 hypothalamic obesity

study, and increased enrollment in our long-term extension study. These

increases were partially offset by reduced activity due to the completion and

winding down of our POMC LEPR, BBS, Phase 2 Basket, renal and GO-ID studies;

? an increase of $3.0 million due to increased purchases of clinical supply

material;

? an increase of $2.4 million due to increased gene sequencing costs associated

with our expanded clinical programs;

an increase of $1.1 million in compensation and benefits due to the hiring of

? additional full-time employees in order to support the growth of our research

and development programs and expansion of regulatory affairs operations;

an increase of $1.0 million in development milestones earned by Camurus AB, or

? Camurus, related to development milestone achieved related to our weekly

formulation; and

? an increase of $0.3 million related to IP and patent related filing activities.

The above increases were partially offset by:

? a decrease of $3.7 million in costs associated with medical affairs; and

? a decrease of $0.7 million in costs associated with next generation research


   and development activities.


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Selling, general and administrative expense. Selling, general and administrative
expense increased by $18.2 million to $65.7 million in the nine months ended
September 30, 2022 from $47.5 million in the nine months ended September 30,
2021, an increase of 38%. The increase was primarily due to the following:

an increase of $8.1 million related to increased costs associated with

? commercial operations, sales and marketing activities for IMCIVREE in

connection with preparing for the U.S. approval for BBS obtained in June 2022

and EC approval in September 2022;

an increase of $6.6 million due to increased compensation and benefits related

? costs associated with additional headcount to support our expanding business

operations as well as to build out our commercial operations in the United

States and internationally; and

an increase of $3.6 million due to increased costs associated with information

? technology, international office space, sponsorships and general corporate

travel related expenses for our expanding workforce.




Other (expense) income, net.  Other (expense) income, net decreased by $101.9
million to ($1.6) million in the nine months ended September 30, 2022. The
decrease was primarily due to the sale of our PRV in February 2021. The sale of
our PRV in the prior year was a non-recurring transaction. Other (expense)
income, net consists of $2.2 million of interest expense related to our RIFA and
a $1.0 million write-off expense related to our RareStone equity for the nine
months ended September 30, 2022, partially offset by $1.4 million of interest
income and $0.7 million of other income resulting from the remeasurement of our
embedded derivative related to our RIFA.

Provision for income taxes.  There is no provision for income taxes for the nine
months ended September 30, 2022, as we project to generate operating losses
during the year.  We recorded a provision for income taxes of $8.0 million as a
result of the sale of our PRV during the nine months ended September 30, 2021.

Net loss. Net loss increased by $111.9 million to $138.6 million for the nine
months ended September 30, 2022, from net loss of $26.7 million for the nine
months ended September 30, 2021. The increase in net loss was primarily a result
of the non-recurring nature of our PRV sale in 2021, which resulted in $100.0
million of other income during the prior year period, as well as higher costs
partially offset by product and license revenue in the current year as noted
above.

Liquidity and Capital Resources

As of September 30, 2022, our cash and cash equivalents and short-term investments were approximately $347.8 million.

Cash flows

The following table provides information regarding our cash flows for the nine months ended September 30, 2022 and 2021:



                                                                 Nine Months Ended September 30,
                                                                    2022                  2021

                                                                          (in thousands)
Net cash provided by (used in):
Operating activities                                          $       (139,428)     $       (105,531)
Investing activities                                                     68,804              (69,407)
Financing activities                                                    196,463               166,381

Net increase (decrease) in cash, cash equivalents and restricted cash

                                               $         125,839               (8,557)


Net cash used in operating activities

The use of cash in all periods resulted primarily from our net loss adjusted for non-cash charges and changes in components of working capital.



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Net cash used in operating activities was $139.4 million for the nine months
ended September 30, 2022 and consisted primarily of a net loss of $120.9 million
adjusted for non-cash items, which consisted of non-cash stock-based
compensation, depreciation and amortization and rent expense. The change in
operating assets and liabilities reflected a total use of cash of approximately
$4.9 million from a decrease in other long-term assets, prepaid expenses and
other current assets coupled with a $13.7 million decrease in accounts payable,
deferred revenue and accrued expenses and other current liabilities.

Net cash used in operating activities was $105.5 million for the nine months
ended September 30, 2021 and consisted primarily of a net loss of $102.0 million
adjusted for non-cash items, which consisted of non-cash stock-based
compensation, the gain on the sale of the PRV, a deferred provision for income
taxes, depreciation and amortization and rent expense.  The change in operating
assets and liabilities reflected a total use of cash of approximately
$5.4 million from an increase in accounts payables and accrued expenses
associated with our CROs, CMOs, and consultants due to the timing of payments,
offset by an increase of $8.9 million in prepaid expenses.

Net cash provided by (used in) investing activities



Net cash provided by investing activities was $68.8 million for the nine months
ended September 30, 2022 and relates to $224.6 million of maturities of
short-term investments, partially offset by $151.5 million of purchases of
short-term investments, a $4.0 million milestone obligation payment under our
license agreement with Ipsen and $0.3 million related to the purchase of
property plant and equipment.

Net cash used in investing activities was $69.4 for the nine months ended
September 30, 2021 and relates to $164.0 million of net purchases of short-term
investments, $0.4 million related to the purchase of property plant and
equipment and $5.0 million for the acquisition of an intangible asset, partially
offset by the $100.0 million in proceeds from the sale of the PRV.

Net cash provided by financing activities



Net cash provided by financing activities was $196.5 million for the nine months
ended September 30, 2022, which represents the net proceeds of $117.0 million
from our common stock offering in September 2022, net proceeds from of $75.0
million from the RIFA, and $4.5 million of cash proceeds from the exercise of
stock options and the issuance of common stock from our 2017 Employee Stock
Purchase Plan, or the ESPP.

Net cash provided by financing activities was $166.4 million for the nine months
ended September 30, 2021, which represents the net proceeds of $161.7 million
from our common stock offering in February 2021 and $4.7 million of cash
proceeds from the exercise of stock options and the issuance of common stock
from the ESPP.

Revenue Interest Financing Agreement



On June 16, 2022, we announced a non-dilutive revenue interest financing
agreement, or RIFA, with HealthCare Royalty Partners, LLC, or HealthCare
Royalty, for a total investment amount of up to $100 million. In exchange for
the total investment amount to be received by Rhythm, HealthCare Royalty will
receive a tiered royalty based on global net product sales generated by
IMCIVREE. For additional information, see Note 10, "Long-term Obligations" to
the unaudited condensed consolidated financial statements included elsewhere in
this Quarterly Report on Form 10-Q.

Funding requirements



We expect our expenses to increase in connection with our ongoing activities,
particularly as we continue the clinical development of and seek marketing
approval for setmelanotide for future indications, and build out our global
organization. In addition, we expect to incur significant commercialization
expenses related to product sales, marketing, manufacturing and distribution to
the extent that such sales, marketing and distribution are not the
responsibility of potential collaborators. We also expect to incur additional
costs associated with operating as a public company.

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We expect that our existing cash and cash equivalents and short-term investments
will be sufficient to fund our operations into 2025. We may need to obtain
substantial additional funding in connection with our research and development
activities and any continuing operations thereafter. If we are unable to raise
capital when needed or on favorable terms, we would be forced to delay, reduce
or eliminate our research and development programs or future commercialization
efforts.

Our future capital requirements will depend on many factors, including:

the cost to commercialize setmelanotide, by building an internal sales force or

? entering into collaborations with third parties and providing support services

for patients;

? the scope, progress, results and costs of clinical trials for our setmelanotide

program;

? the costs, timing and outcome of regulatory review of our setmelanotide

program;

? the obligations owed to Ipsen, Camurus and Takeda pursuant to our license

agreements;

? the extent to which we acquire or in-license other product candidates and

technologies;

the costs of preparing, filing and prosecuting patent applications, maintaining

? and enforcing our intellectual property rights and defending intellectual

property-related claims;

? our ability to establish and maintain additional collaborations on favorable

terms, if at all; and

? the costs of operating as a public company, including those resulting from

losing our emerging growth company status.


Although IMCIVREE has been approved by the FDA and authorized by the EC and
Great Britain in certain indications, IMCIVREE may not achieve commercial
success. In addition, developing our setmelanotide program is a time-consuming,
expensive and uncertain process that may take years to complete, and we may
never generate the necessary data or results required to obtain future marketing
approvals and achieve product sales. Accordingly, we will need to continue to
rely on additional financing to achieve our business objectives. Adequate
additional financing may not be available to us on acceptable terms, or at all.

In addition, the magnitude and duration of the COVID-19 pandemic and its impact
on our liquidity and future funding requirements is uncertain as of the filing
date of this Quarterly Report as this continues to evolve globally. See "Impact
of COVID-19" above and "Risk Factors- The COVID-19 pandemic has and may continue
to adversely impact our business, including our preclinical studies, clinical
trials and our commercialization prospects." in Part II, Item 1A of this
Quarterly Report for a further discussion of the possible impact of the COVID-19
pandemic on our business.

Until such time, if ever, as we can generate substantial product revenues, we
expect to finance our cash needs through a combination of equity offerings, debt
financings, collaborations, strategic alliances and licensing arrangements.

To the extent that we raise additional capital through the sale of equity or
convertible debt securities, the ownership interest of our stockholders will be
diluted, and the terms of these securities may include liquidation or other
preferences that adversely affect the rights of our common stockholders. Debt
financing, if available, involves agreements that include covenants limiting or
restricting our ability to take specific actions, such as incurring additional
debt, making capital expenditures or declaring dividends.

If we raise funds through additional collaborations, strategic alliances or
licensing arrangements with third parties or other means, we may have to
relinquish valuable rights to our setmelanotide program on terms that may not be
favorable to us. If we are unable to raise additional funds through equity, debt
financings or other means, when needed, we may be

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required to delay, limit, reduce or terminate our product development or future commercialization efforts or grant rights to develop and market our setmelanotide program that we would otherwise prefer to develop and market ourselves.

Contractual obligations



As of September 30, 2022, apart from additional contractual obligations under
our RIFA as disclosed in Note 10, "Long-Term Obligations", to the unaudited
condensed consolidated financial statements included under Part I, Item 1 of
this Quarterly Report on Form 10-Q, there were no other material changes to our
principal contractual obligations and commitments as reported in our Annual
Report on Form 10-K for the fiscal year ended December 31, 2021.

Recent Accounting Pronouncements


For a discussion of pending and recently adopted accounting pronouncements, see
Note 2 to our unaudited condensed consolidated financial statements included
elsewhere in this Quarterly Report on Form 10-Q.

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