The following information should be read in conjunction with the unaudited
financial information and the notes thereto included in this Quarterly Report on
Form 10­Q and the audited financial information and the notes thereto included
in the Annual Report.  In addition, this discussion and analysis contains
forward-looking statements and involves numerous risks and uncertainties,
including, but not limited to, those described under "Special Note Regarding
Forward-Looking Statements" and under "Item 1A. Risk Factors" in this report,
and in other reports we file with the SEC, that could cause actual results to
differ materially from the results described in or implied by the
forward-looking statements contained in the following discussion and analysis.



Overview

We are a clinical-stage biopharmaceutical company developing a pipeline of novel
product candidates against validated molecular targets in indications of high
unmet medical need. We focus on molecules and pathways whose role in the disease
process is well known based on prior research, but have previously failed to
yield successful products due to poor efficacy and tolerability. Our unique
approach to drug development leverages recent technological advances to design
improved drugs, employs early use of biomarkers to confirm biological activity
and focuses on potential use of expedited regulatory pathways. Our first
molecular target is aldose reductase, or AR, an enzyme that converts glucose to
sorbitol under oxidative stress conditions, and is implicated in multiple
diseases. Prior attempts to inhibit this enzyme were hindered by nonselective,
nonspecific inhibition, which resulted in limited efficacy and significant
off-target safety effects. The detrimental consequences of AR activation have
been well established by decades of prior research. Our AR program currently
includes three small molecules, which are all potent and selective inhibitors of
AR, but are engineered to have unique tissue permeability profiles to target
different disease states, including diabetic complications, heart disease and a
rare pediatric metabolic disease. Using similar strategies to our AR inhibitors,
or ARI, program, we have also developed a program targeting selective inhibition
of phosphatidylinositol 3-kinase, or PI3K, subunits that produced an early-stage
oncology pipeline. The result of this unique multifaceted approach to drug
development is a portfolio of highly specific and selective product candidates
that we believe are significantly de-risked and can move quickly through the
development process. We plan to initiate our clinical program in these
indications in 2020 and 2021.



AT-007 is a novel central nervous system, or CNS, penetrant ARI that we are
developing for the treatment of galactosemia, a devastating rare pediatric
metabolic disease that affects how the body processes a simple sugar called
galactose, and for which there is no known cure or approved treatment available.
In May 2019, the U.S. Food and Drug Administration, or FDA, granted orphan drug
designation to AT-007 for the treatment of galactosemia. We initiated a Phase
1/2 study of AT-007 in galactosemia in June 2019. The study is a double-blind
placebo-controlled trial evaluating safety and pharmacokinetics of AT-007 in
healthy volunteers, as well as safety, pharmacokinetics and biomarker effects in
adult galactosemia patients over 28 days of once daily oral dosing. The key
biomarker outcome of the study was reduction in galactitol, an aberrant toxic
metabolite of galactose, formed by AR in galactosemia patients.



In January 2020, we announced positive topline results. AT-007 treatment
resulted in a statistically significant and robust reduction in plasma
galactitol versus placebo in adult galactosemia patients. Reductions in
galactitol were dose dependent, with higher concentrations of AT-007 resulting
in a greater magnitude of reduction in galactitol. At the highest dose tested
(20mg/kg), AT-007 significantly reduced plasma galactitol 45-54% from baseline
versus placebo (with a p value of less than 0.01). Galactitol reduction was
rapid and sustained over time. No substantial change from baseline was observed
in placebo treated patients. AT-007 was well tolerated, with no drug-related
adverse events noted to date in galactosemia patients or in the 72 healthy
volunteers treated in Part 1 of the trial.



On April 21, 2020, the Company announced full results of the ACTION-Galactosemia
study. As previously announced, once-daily 20mg/kg AT-007 reduced galactitol
levels by approximately 50% in galactosemia patients. Reduction in galactitol
levels was rapid (within 6 days of consecutive AT-007 treatment) and sustained
throughout the treatment period of 27 days. Reduction in galactitol from
baseline was statistically significant at the 20mg/kg vs placebo (p<0.01). The
lower dose tested, 5mg/kg, demonstrated a similar trend in reducing galactitol
levels approximately 20% from baseline (p=NS from placebo). Reduction in
galactitol did not result in derangement of other metabolites in the galactose
pathway, such as galactose and gal-1p. As no drug-related adverse events were
seen at the once-daily 20mg/kg dose, a once-daily 40mg/kg dose was subsequently
studied in healthy volunteers and is ongoing in

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galactosemia patients. The 40mg/kg dose was safe and well tolerated. Evaluation of once-daily 40mg/kg AT-007 in galactosemia patients remains ongoing. No drug-related adverse events were reported at any dose of AT-007 in ACTION-Galactosemia.

A 90-day safety extension study for ACTION-Galactosemia is ongoing. The extension study is open to patients from the core study and to new adult galactosemia patients.

On April 30, 2020 the FDA granted Pediatric Rare Disease designation to AT-007 for treatment of galactosemia. The FDA had previously granted AT-007 Orphan Designation.





In May 2020 the Company met with the FDA to discuss the ongoing galactosemia
development program.  Specifically, the design of the galactosemia pediatric
study was discussed and feedback from FDA was subsequently incorporated into the
pediatric study protocol. The study is designed similarly to ACTION-Galactosemia
with a bio-marker based endpoint of galactitol reduction. We continue to work
with the FDA to finalize the study protocol, and we expect to commence the trial
as planned in Q2 of this year. Both the adult extension study and the pediatric
study are designed to incorporate primarily home health visits in order to limit
travel and risk of exposure to Covid-19.



The Company is also engaged in preclinical work on AT-007 in another pediatric
rare disease, called PMM2-CDG. PMM2-CDG is a glycosylation disorder caused by
deficiencies in the enzyme phosphomannomutase 2, which leads to CNS symptoms
similar to galactosemia, including low IQ, tremor, and speech and motor
problems. Aldose Reductase is over-activated in this disease as a compensatory
consequence of PMM2 deficiency, and a CNS penetrant ARI may be a compelling
clinical option. Initial data in fibroblast cell lines derived from PMM2-CDG
patients demonstrates that AT-007 treatment increases phosphomannomutase 2
activity. We may pursue clinical development in this indication in the future.



We are also working on a rare disease caused by Sorbitol Dehydrogenase
deficiency, called SORD. Aldose Reductase is the first enzyme in the polyol
pathway, converting glucose to sorbitol. AR is then followed by Sorbitol
Dehydrogenase, which converts sorbitol to fructose. Patients with SORD build up
very high levels of sorbitol in their cells and tissues as a result of the
enzyme deficiency, which results in tissue toxicities such as peripheral
neuropathy. Recent research in drosophila and cell models of SORD demonstrates
that treatment with an ARI that blocks sorbitol production may provide benefit
in this disease. The Company is working with researchers to explore potential
benefit in SORD models of disease, and may initiate a clinical development
program. Intellectual property applications have previously been filed related
to both PMM2-CDG and SORD.



AT-001 is a novel ARI with broad systemic exposure and peripheral nerve
permeability that we are developing for the treatment of diabetic
cardiomyopathy, or DbCM, a fatal fibrosis of the heart, for which no treatments
are available. We completed a Phase 1/2 clinical trial evaluating AT-001 in
approximately 120 patients with type 2 diabetes, in which no drug-related
adverse effects or tolerability issues were observed. In September 2019, we
announced the initiation of a Phase 3 registrational trial for AT-001 in DbCM.
The study, called ARISE-HF, will investigate AT-001's ability to improve or
prevent the decline of functional capacity in patients with DbCM at high risk of
progression to overt heart failure.



On April 2, the Company announced that a Covid-19 IND had been opened with the
FDA for AT-001. AT-001 investigator-initiated trials were initiated at Mt. Sinai
and NYU to address acute lung inflammation and cardiomyopathy in critical
Covid-19 patients. The company also announced that the drug was being provided
free of charge through "Named Patient" Emergency INDs at multiple hospitals
across the US in critical Covid-19 patients.



Covid-19 can cause significant cardiac morbidities, including cardiomyopathy.
AT-001, has been shown to prevent oxidative damage to cardiomyocytes, and
decrease oxidative-induced damage. In severe cases, Covid-19 infection can lead
to development of Acute Respiratory Distress Syndrome (ARDS) and Acute lung
Inflammation/Injury (ALI) resulting from inflammatory response. In an animal
model of sepsis-induced ALI, Aldose Reductase inhibition was shown to have a
beneficial effect and attenuate severity of disease by reducing cytokines (such
as IL-6), neutrophil infiltration into the lungs, and activation of lung
inflammatory endothelial cells. The company will make a decision as to

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whether to pursue further clinical development of AT-001 in Covid-19 based on the results of these pilot studies and individual patient results.





In March 2020 the Company hired a Chief Commercial Officer, and build-out of
commercial infrastructure commenced.  As such, we expect commercial expenditures
to increase in 2020 as we prepare for potential galactosemia commercial launch,
including additional costs related to marketing, market access, market research
and sales and forecasting, as well as an increase in compensation expense
related to several new hires in connection with the build-out.



Since inception in 2016, our operations have focused on developing our product
candidates, organizing and staffing our company, business planning, raising
capital, establishing our intellectual property portfolio and conducting
clinical trials. We do not have any product candidates approved for sale and
have not generated any revenue.

Initial Public Offering



On May 16, 2019, the Company completed an initial public offering, or IPO, in
which the Company issued and sold 4,000,000 shares of its common stock at a
public offering price of $10.00 per share, for aggregate gross proceeds of $40.0
million. The Company received approximately $34.6 million in net proceeds after
deducting underwriting discounts and commissions and offering costs. The shares
began trading on The Nasdaq Global Market on May 14, 2019. Upon completion of
the IPO, all of our outstanding shares of convertible preferred stock, converted
into 7,538,671 shares of our common stock.

Prior to the completion of the IPO, the Company primarily funded its operations
with proceeds from the sale of convertible preferred stock. We have incurred
significant operating losses since inception in 2016. Our ability to generate
product revenue sufficient to achieve profitability will depend on the
successful development and commercialization of one or more of our product
candidates. Our net loss was $12.4 million for the three months ended March 31,
2020. As of March 31, 2020, we had an accumulated deficit of $79.1 million. We
expect to continue to incur significant expenses and increasing operating losses
for the foreseeable future in connection with our ongoing activities.
Furthermore, we expect to incur additional costs associated with operating as a
public company that we did not previously incur or had previously incurred at
lower rates as a private company, including significant legal, accounting,
investor relations and other expenses. As of March 31, 2020, we had cash and
cash equivalents and short-term investments of $154.3 million.

November 2019 Private Placement



On November 7, 2019, we entered into a securities purchase agreement for the
Private Placement with the Purchasers. Pursuant to the securities purchase
agreement, the Purchasers purchased 1,380,344 shares of our common stock. The
purchase price for each share was $14.50, with net proceeds of approximately $18
million. The closing of the purchase and sale of the securities occurred on
November 12, 2019.



January 2020 Secondary Public Offering



In January 2020, we issued and sold 2,741,489 shares of our common stock at a
public offering price of $45.50 per share, with an additional 411,223 shares
sold pursuant to the underwriters' full exercise of their option to purchase
additional shares in the Secondary Public Offering. We received aggregate net
proceeds, net of underwriting discounts and commissions and estimated offering
expenses of $134.1 million.

Components of Our Results of Operations

Revenue



Since inception, we have not generated any revenue and do not expect to generate
any revenue from the sale of products in the near future. If our development
efforts for our product candidates are successful and result in regulatory

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approval, or if we enter into collaboration or license agreements with third
parties, we may generate revenue in the future from a combination of product
sales or payments from collaboration or license agreements.

Operating Expenses

Research and Development Expenses



Research and development expenses consist primarily of costs incurred for our
research activities, including our discovery efforts and the development of our
product candidates, and include:

· employee­related expenses, including salaries, related benefits and stock­based

compensation expense for employees engaged in research and development

functions;

· fees paid to consultants for services directly related to our product

development and regulatory efforts;

· expenses incurred under agreements with contract research organizations, or

CROs, as well as contract manufacturing organizations, or CMOs, and consultants

that conduct and provide supplies for our preclinical studies and clinical

trials;

· costs associated with preclinical activities and development activities;

· costs associated with our technology and our intellectual property portfolio;

and

· costs related to compliance with regulatory requirements.




We expense research and development costs as incurred. Costs for external
development activities are recognized based on an evaluation of the progress to
completion of specific tasks using information provided to us by our vendors.
Payments for these activities are based on the terms of the individual
agreements, which may differ from the pattern of costs incurred, and are
reflected in our financial statements as prepaid or accrued research and
development expenses.

Research and development activities are central to our business model. We expect
that our research and development expenses will continue to increase for the
foreseeable future as we continue clinical development for our product
candidates and continue to discover and develop additional product candidates.
If any of our product candidates enter into later stages of clinical
development, they will generally have higher development costs than those in
earlier stages of clinical development, primarily due to the increased size and
duration of later­stage clinical trials. Historically, we have incurred research
and development expenses that primarily relate to the development of AT­001,
AT­007, and our ARI program. As we advance our product candidates, we expect to
allocate our direct external research and development costs across each of the
indications or product candidates.

General and Administrative Expenses



General and administrative expenses consist primarily of salaries and other
related costs, including stock­based compensation, for personnel in our
executive and finance functions. General and administrative expenses also
include professional fees for legal, accounting, auditing, tax and consulting
services; travel expenses; and facility­related expenses, which include
allocated expenses for rent and maintenance of facilities and other operating
costs.

We expect that our general and administrative expenses will increase in the
future as we increase our general and administrative headcount to support our
continued research and development and potential commercialization of our
product candidates. We also expect to incur increased expenses associated with
being a public company, including costs of accounting, audit, legal, regulatory
and tax compliance services; director and officer insurance costs; and investor
and public relations costs.

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Other Income (Expense), Net

Other income (expense), net consists of interest income (expense), net, and other expenses. Interest income (expense), net consists primarily of our interest income on our cash and cash equivalents and marketable securities. Other expense consists primarily of realized gains and losses on sales of marketable securities.

Results of Operations

Three Months Ended March 31, 2020 and 2019

The following table summarizes our results of operations for the three months ended March 31, 2020 and 2019:






                                                     (Unaudited)
                                                 Three Months Ended
                                                     March 31,
              (in thousands)                      2020         2019
              Operating expenses:
              Research and development         $    7,271    $   6,874
              General and administrative            5,196        1,855
              Total operating expenses             12,467        8,729
              Loss from operations               (12,467)      (8,729)
              Other (expense) income, net:
              Interest income (expense), net          122          (1)
              Loss on extinguishment of debt            -            -
              Other expense                          (24)            -
              Other (expense) income, net              98          (1)
              Net loss                         $ (12,369)    $ (8,730)

Research and Development Expenses

The following table summarizes our research and development expenses for the three months ended March 31, 2020 and 2019:






                                                  Three Months Ended
                                                      March 31,
      (in thousands)                               2020         2019      Increase

      Clinical and pre-clinical                 $    5,162     $ 4,333    $

829


      Drug manufacturing and formulation               616       1,635     

(1,019)


      Personnel expenses                               782         625          157
      Stock-based compensation                         642         147          495
      Regulatory and other                              69         134         (65)
      Total research and development expenses   $    7,271     $ 6,874    $     397




Research and development expenses for the three months ended March 31, 2020 were
$7.3 million, compared to $6.9 million for the three months ended March 31,
2019. For the three months ended March 31, 2020, the increase of $0.4 million
was primarily related to the increase in clinical and pre-clinical expenses of
$0.8  million for the advancement of clinical trials, increase in
personnel-related costs of $0.2 million and $0.5 million increase in stock-based
compensation expense due to an increase in headcount, which were offset by the
decrease in drug manufacturing and formulation expenses of $1.0 million and
decrease in regulatory and other expenses of $0.1 million.

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General and Administrative Expenses

The following table summarizes our general and administrative expenses for the three months ended March 31, 2020 and 2019:






                                                   Three Months Ended
                                                       March 31,
    (in thousands)                                  2020         2019       Increase
    Personnel expenses                           $      610     $   259    $      351
    Stock-based compensation                            689         178           511
    Legal and professional fees                       2,182         921         1,261
    Other expenses                                    1,715         497         1,218
    Total general and administrative expenses    $    5,196     $ 1,855    $    3,341




General and administrative expenses were $5.2 million for the three months ended
March 31, 2020, compared to $1.9 million for the three months ended March 31,
2019. For the three months ended March 31, 2020, the increase of $3.3 million
was primarily related to the increase in personnel expenses and stock-based
compensation of $0.4 million and $0.5 million, respectively, due to the increase
in headcount, including the hiring of the chief financial officer and chief
accounting officer, $1.3 million related to an increase in legal and
professional fees due to increased costs associated with being a public company,
and $1.2 million in other expenses relating to increased costs of insurance,
rent, and other office expenses.

Interest Income (Expense), Net



Interest income was $0.1 million for the three months ended March 31, 2020, as
compared to $1,000 expense for the three months ended March 31, 2019. The change
was primarily related to interest income from the Company's marketable
securities of $0.1 million for the three months ended March 31, 2020, which did
not exist for the three months ended March 31, 2019.

Other Expense



Other expense was $24,000 for the three months ended March 31, 2020, compared to
zero for the three months ended March 31, 2019. The change was primarily related
to the realized loss of $25,000 related to loss on foreign exchange transactions
that did not exist during the three months ended March 31, 2019, offset by other
income of $1,000.

Liquidity and Capital Resources



Since our inception through March 31, 2020, we have not generated any revenue
and have incurred significant operating losses and negative cash flows from our
operations. We expect our existing cash and cash equivalents and short-term
investments of $154.3 million as of March 31, 2020 will be sufficient to fund
our operating expenses and capital expenditure requirements for at least 12
months from the date of this Quarterly Report on Form 10-Q.

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Cash Flows

The following table summarizes our cash flows for each of the periods presented:




                                                             Three Months Ended
                                                                 March 31,
   (in thousands)                                             2020         2019
   Net cash used in operating activities                   $ (18,855)    $ 

(7,002)


   Net cash used in investing activities                     (41,711)       

-


   Net cash provided by financing activities                  134,219       

2,940

Net increase (decrease) in cash and cash equivalents $ 73,653 $ (4,062)






Operating Activities

Net cash used in operating activities for the three months ended March 31, 2020,
was $18.9 million. For the three months ended March 31, 2020, the increase was
primarily due to our net losses of $12.4 million from clinical and pre-clinical
expenses, an increase in prepaid expenses of $2.1 million and a decrease in
accounts payable of $7.2 million, which is partially offset by an increase in
accrued expenses and other current liabilities of $1.5 million, $1.3 million in
non-cash stock-based compensation expense, and $0.1 million in amortization of
operating lease right-of-use assets.

Net cash used in operating activities for three months ended March 31, 2019, was
$7.0 million and was primarily due to our net loss of $8.7 million from drug
manufacturing and formulation expenses, an increase in prepaid expenses of $0.5
million, and a decrease of $0.4 million in accounts payable, which are partially
offset by increases $2.3 million in accrued expenses and other current
liabilities and $0.3 million in non-cash stock-based compensation expense.

Investing Activities



Net cash used in investing activities for the three months ended March 31, 2020
was $41.7 million relating to our purchase of available-for-sale securities for
$41.7 million.

During the three months ended March 31, 2019, there were no investing activities.

Financing Activities



During the three months ended March 31, 2020, net cash provided by financing
activities was $134.2 million, primarily from the cash proceeds from the
secondary offering of $134.1 million and $0.1 million from the exercise of stock
options for common stock under the Equity Incentive Plan.

During the three months ended March 31, 2019, net cash provided by financing
activities was $2.9 million, primarily from the cash proceeds from the issuance
of Series B Preferred Stock resulting in $3.1 million cash proceeds offset by
payment of initial public offering costs of $0.2 million.

Funding Requirements



We expect our expenses to increase substantially in connection with our ongoing
activities, particularly as we advance the preclinical activities and clinical
trials of our product candidates. We expect that our expenses will increase
significantly if and as we:

· continue the ongoing and planned development of our product candidates;

· initiate, conduct and complete any ongoing, anticipated or future preclinical

studies and clinical trials for our current and future product candidates;




 ·  seek marketing approvals for any product candidates that successfully complete
    clinical trials;


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· establish a sales, marketing, manufacturing and distribution infrastructure to

commercialize any current or future product candidate for which we may obtain

marketing approval;

· seek to discover and develop additional product candidates;

· continue to build a portfolio of product candidates through the acquisition or

in­license of drugs, product candidates or technologies;

· maintain, protect and expand our intellectual property portfolio;

· hire additional clinical, regulatory and scientific personnel; and

· add operational, financial and management information systems and personnel,

including personnel to support our product development and planned future

commercialization efforts.




Furthermore, we have and expect to continue to incur additional costs associated
with operating as a public company, including significant legal, accounting,
investor relations and other expenses that we did not incur as a private
company.

Due to the numerous risks and uncertainties associated with the development of
our product candidates and programs, and because the extent to which we may
enter into collaborations with third parties for development of our product
candidates is unknown, we are unable to estimate the timing and amounts of
increased capital outlays and operating expenses associated with completing the
research and development of our product candidates. Our future funding
requirements, both near and long-term, will depend on many factors, including:

· the initiation, scope, progress, timing, costs and results of our ongoing and

planned clinical trials for our product candidates;

· the outcome, timing and cost of meeting regulatory requirements established by

the FDA and other comparable foreign regulatory authorities;

· the cost of filing, prosecuting, defending and enforcing our patent claims and

other intellectual property rights;

· the cost of defending potential intellectual property disputes, including

patent infringement actions;

· the achievement of milestones or occurrence of other developments that trigger

payments under the Columbia Agreements or other agreements we may enter into;

· the extent to which we are obligated to reimburse, or entitled to reimbursement

of, clinical trial costs under future collaboration agreements, if any;

· the effect of competing technological and market developments;

· the cost and timing of completion of clinical or commercial­scale manufacturing

activities;

· the costs of operating as a public company;

· the extent to which we in­license or acquire other products and technologies;




 ·  our ability to establish and maintain collaborations on favorable terms, if at
    all;


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· the cost of establishing sales, marketing and distribution capabilities for our

product candidates in regions where we choose to commercialize our product

candidates, if approved; and

· the initiation, progress, timing and results of the commercialization our

product candidates, if approved, for commercial sale.

A change in the outcome of any of these variables with respect to the development of a product candidate could mean a significant change in the costs and timing associated with the development of that product candidate.



Until such time, if ever, that we can generate product revenue sufficient to
achieve profitability, we expect to finance our cash needs through offerings of
securities, private equity financing, debt financings, collaborations or other
strategic transactions. The terms of financing may adversely affect the holdings
or the rights of our stockholders. Funding may not be available to us on
acceptable terms, or at all. If we are unable to obtain funding, we may be
required to delay, limit, reduce or terminate some or all of our research and
product development, product portfolio expansion or future commercialization
efforts. If we raise additional capital through debt financing, we may be
subject to covenants limiting or restricting our ability to take specific
actions, such as incurring additional debt, making capital expenditures or
declaring dividends.

Contractual Obligations and Commitments



The following table summarizes our contractual obligations as of March 31, 2020:


                                                                      Payments Due By Period
                                                          Less Than                                       More Than
(in thousands)                                 Total       1 Year       1 to 3 Years     4 to 5 Years      5 Years
Operating lease commitments(1)                $ 2,228    $       465    $       1,466    $         297    $        -
Total                                         $ 2,228    $       465    $       1,466    $         297    $        -

--------------------------------------------------------------------------------

(1) Represents future minimum lease payments under our operating lease for office

space.




Except as disclosed in the table above, we have no long­term debt or capital
leases and no material non­cancelable purchase commitments with service
providers, as we have generally contracted on a cancelable, purchase­order
basis. We enter into contracts in the normal course of business with CROs, CMOs
and other third parties for clinical trials, preclinical research studies and
testing and manufacturing services. These contracts are cancelable by us upon
prior notice. Payments due upon cancellation consist only of payments for
services provided or expenses incurred, including noncancelable obligations of
our service providers, up to the date of cancellation. These payments are not
included in the preceding table as the amount and timing of such payments are
not known.

We may incur potential contingent payments upon our achievement of clinical,
regulatory and commercial milestones, as applicable, or royalty payments that we
may be required to make under the 2016 and 2019 Columbia Agreements pursuant to
which we have in­licensed certain intellectual property. Due to the uncertainty
of the achievement and timing of the events requiring payment under this
agreement, the amounts to be paid by us are not fixed or determinable at this
time and are excluded from the table above.

Critical Accounting Policies and Significant Judgments and Estimates



Our management's discussion and analysis of financial condition and results of
operations is based on our financial statements, which have been prepared in
accordance with U.S. generally accepted accounting principles, or U.S. GAAP. The
preparation of our financial statements and related disclosures requires us to
make estimates and assumptions that affect the reported amounts of assets and
liabilities, costs and expenses and the disclosure of contingent assets and
liabilities in our financial statements. We base our estimates on historical
experience, known trends and events and various other factors that we believe
are reasonable under the circumstances, the results of which form the basis for
making judgments about the carrying values of assets and liabilities that are
not readily apparent from other sources. We

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evaluate our estimates and assumptions on an ongoing basis. Our actual results may differ from these estimates under different assumptions or conditions.



There have been no significant changes to our critical accounting policies from
those described in "Management's Discussion and Analysis of Financial Condition
and Results of Operations," included in our Annual Report on Form 10-K other
than what is noted below.

Stock­Based Compensation

We account for our stock­based compensation as expense in the statements of operations based on the awards' grant date fair values. We account for forfeitures as they occur by reversing any expense recognized for unvested awards.



We estimate the fair value of options granted using the Black­Scholes option
pricing model. The Black­Scholes option pricing model requires inputs based on
certain subjective assumptions, including (a) the expected stock price
volatility, (b) the calculation of expected term of the award, (c) the risk­free
interest rate and (d) expected dividends. Due to a historical lack of a public
market for our common stock and a lack of company­specific historical and
implied volatility data, we have based our estimate of expected volatility on
the historical volatility of a group of similar companies that are publicly
traded. The historical volatility is calculated based on a period of time
commensurate with the expected term assumption. The computation of expected
volatility is based on the historical volatility of a representative group of
companies with similar characteristics to us, including stage of product
development and life science industry focus. We use the simplified method as
allowed by the SEC Staff Accounting Bulletin No. 107, Share­Based Payment, to
calculate the expected term for options granted as we do not have sufficient
historical exercise data to provide a reasonable basis upon which to estimate
the expected term. The risk­free interest rate is based on a treasury instrument
whose term is consistent with the expected term of the stock options. The
expected dividend yield is assumed to be zero as we have never paid dividends
and have no current plans to pay any dividends on our common stock. The fair
value of stock­based payments is recognized as expense over the requisite
service period which is generally the vesting period.

Determination of the Fair Value of Common Stock



As there was no public market for our common stock prior to the IPO on May 16,
2019, the estimated fair value of our common stock prior to May 16, 2019 had
been determined by our board of directors, with input from management,
considering third party valuations of our common stock as well as our board of
directors' assessment of additional objective and subjective factors that it
believed were relevant and which may have changed from the date of the most
recent third party valuation through the date of the option grant. These third
party valuations were performed in accordance with the guidance outlined in the
American Institute of Certified Public Accountants' Accounting and Valuation
Guide, Valuation of Privately­Held­Company Equity Securities Issued as
Compensation.

In addition to considering the results of these third party valuations, our board of directors considered various objective and subjective factors to determine the fair value of our common stock as of each grant date, including:

· the prices at which we sold shares of preferred stock and the superior rights

and preferences of the preferred stock relative to our common stock at the time

of each grant;

· the progress of our research and development programs, including the status and

results of preclinical studies for our product candidates;

· our stage of development and commercialization and our business strategy;

· external market conditions affecting the biotechnology industry and trends


    within the biotechnology industry;


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· our financial position, including cash on hand, and our historical and

forecasted performance and operating results;

· the lack of an active public market for our common stock and our preferred

stock;

· the likelihood of achieving a liquidity event, such as an initial public

offering, or sale of our company in light of prevailing market conditions; and

· the analysis of initial public offerings and the market performance of similar

companies in the biotechnology industry.

The assumptions underlying these valuations represented management's best estimate, which involved inherent uncertainties and the application of management's judgment. As a result, if we had used different assumptions or estimates, the fair value of our common stock and our stock­based compensation expense could have been materially different.

Options Granted



The intrinsic value of all outstanding options as of March 31, 2020 was
$104.5 million, based on the fair value of our common stock of $32.69 per share,
of which approximately $61.1 million related to vested options and approximately
$43.4 million related to unvested options.

Off­Balance Sheet Arrangements

We have not entered into any off­balance sheet arrangements and do not have any holdings in variable interest entities.

Recently Issued Accounting Pronouncements



Refer to Note 1, in the accompanying notes to our condensed financial statements
appearing elsewhere in this Quarterly Report on Form 10­Q for a discussion of
recent accounting pronouncements.

Emerging Growth Company Status



The Jumpstart Our Business Startups Act of 2012 permits an "emerging growth
company" such as us to take advantage of an extended transition period to comply
with new or revised accounting standards applicable to public companies until
those standards would otherwise apply to private companies. We have irrevocably
elected to "opt out" of this provision and, as a result, we will comply with new
or revised accounting standards when they are required to be adopted by public
companies that are not emerging growth companies.

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