You should read the following discussion and analysis of our financial condition
and results of operations in conjunction with our consolidated financial
statements and related notes and other financial information included elsewhere
in this Annual Report on Form 10-K. In addition to historical information, some
of the statements contained in this discussion and analysis or set forth
elsewhere in this Annual Report on Form 10-K, including information with respect
to our plans and strategy for our business, constitute 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, or
the Exchange Act. We have based these forward-looking statements on our current
expectations and projections about future events. The following information and
any forward-looking statements should be considered in light of factors
discussed elsewhere in this Annual Report on Form 10-K, particularly including
those risks identified in Part I, Item 1A "Risk factors" and our other filings
with the Securities Exchange Commission, or SEC.

We caution you that forward-looking statements are not guarantees of future
performance and that our actual results of operations, financial condition and
liquidity, and the development of the industry in which we operate may differ
materially from the forward-looking statements contained in this Annual Report
on Form 10-K. Statements made herein are as of the date of the filing of this
Annual Report on Form 10-K with the SEC and should not be relied upon as of any
subsequent date. Even if our results of operations, financial condition and
liquidity, and the development of the industry in which we operate are
consistent with the forward-looking statements contained in this Annual Report
on Form 10-K, they may not be predictive of
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results or developments in future periods. We disclaim any obligation, except as
specifically required by law and the rules of the SEC, to publicly update or
revise any such statements to reflect any change in our expectations or in
events, conditions or circumstances on which any such statements may be based or
that may affect the likelihood that actual results will differ from those set
forth in the forward-looking statements.

Overview



We are a clinical-stage biotechnology company committed to applying our leading
expertise in the field of oncolytic immunotherapy to transform the lives of
cancer patients through our novel tumor-directed oncolytic immunotherapies. Our
proprietary tumor-directed oncolytic immunotherapy product candidates are
designed and intended to maximally activate the immune system against cancer.

Oncolytic immunotherapy is an emerging drug class, which we intend to establish
as the second cornerstone of immune-based cancer treatments, alongside
checkpoint blockade. Oncolytic immunotherapy exploits the ability of certain
viruses to selectively replicate in and directly kill tumors, as well as induce
a potent, patient-specific, anti-tumor immune response. Our product candidates
incorporate multiple mechanisms of action into a practical "off-the-shelf"
approach that is intended to maximize the immune response against a patient's
cancer and to offer significant advantages over other approaches of inducing
anti-tumor immunity, including personalized vaccine approaches. We believe that
the bundling of multiple approaches for the treatment of cancer into single
therapies will simplify the development path of our product candidates, while
also improving patient outcomes at a lower cost to the healthcare system than
the use of multiple different drugs.

Financial



Since our inception, we have devoted substantially all of our resources to
developing our proprietary RPx platform, building our intellectual property
portfolio, conducting research and development of our product candidates,
business planning, raising capital and providing selling, general and
administrative support for our operations. To date, we have financed our
operations primarily with proceeds from the sale of equity securities and to a
lesser extent the proceeds from the issuance of debt securities. We do not have
any products approved for sale and have not generated any revenue from product
sales.

Since commencement of our initial public offering, or IPO, on July 20, 2018, we
have raised an aggregate of approximately $569.0 million in net proceeds to fund
our operations, of which $101.2 million was from our IPO, $463.4 million was
from three separate follow-on offerings, or the Public Offerings, that we closed
in November 2019, June 2020 and October 2020, respectively, and $4.4 million was
from at-the-market offerings. We sold 7,407,936 shares of common stock in our
IPO, an aggregate of 13,619,822 shares of our common stock and pre-funded
warrants to purchase 5,284,238 shares of our common stock in the Public
Offerings, and 287,559 shares of common stock through our at-the-market
facility.

Funds affiliated with two separate institutional investors hold all of our
outstanding pre-funded warrants. Other than as set forth in Notes 8, 9 and 10 of
the "Notes to Consolidated Financial Statements" contained in Part II, Item 8 of
this Annual Report on From 10-K, the shares of our common stock into which our
outstanding pre-funded warrants are exercisable are not included in the number
of issued and outstanding shares of our common stock set forth in this Annual
Report on Form 10-K.

In addition, on August 8, 2019, we entered into a Loan and Security Agreement
with Hercules Capital, Inc., or Hercules, which we refer to as the Hercules Loan
Agreement, pursuant to which we borrowed $10.0 million under a secured term loan
facility in the amount of $30.0 million. The Hercules Loan Agreement was
subsequently amended on June 1, 2020, in order to, among other things, increase
the secured term loan facility from $30.0 million to $40.0 million. On
December 15, 2020, we paid a total of $10.8 million, representing the
outstanding principal, accrued and unpaid interest, fees, costs and expenses due
and owing under the Hercules Loan Agreement and related loan documents, in
repayment of all of our outstanding obligations thereunder, and thereby
terminated the Hercules Loan Agreement and the related loan documents.

Since our inception, we have incurred significant operating losses. Our ability
to generate product revenue sufficient to achieve profitability will depend on
the successful development and eventual commercialization of one or more of our
product candidates. Our net losses were $118.0 million and $80.9 million for
the years ended March 31, 2022 and 2021, respectively. As of March 31, 2022, we
had an accumulated deficit of $311.2 million. These losses have resulted
primarily from costs incurred in connection with research and development
activities and selling, general and administrative costs associated with our
operations. We expect to continue to incur significant expenses and increasing
operating losses for at least the next several years.

We anticipate that our expenses and capital requirements will increase substantially in connection with our ongoing activities, particularly as we advance the clinical trials, development and pre-commercial activities related to our RPx platform product candidates, and if and as we:


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•conduct our current and future clinical trials with RP1, RP2 and RP3;

•further preclinical development of our RPx platform;

•qualify, operate or maintain our own in-house manufacturing facility;

•seek to identify and develop additional product candidates;

•seek marketing approvals for any of our product candidates that successfully complete clinical trials, if any;

•establish a sales, marketing and distribution infrastructure to commercialize any products for which we may obtain marketing approval;

•until our manufacturing facility is fully validated, continued limited manufacturing by third parties for clinical development;

•maintain, expand and protect our intellectual property portfolio;

•hire and retain additional clinical, quality control, scientific and selling, general and administration personnel;

•acquire or in-license other drugs and technologies; and



•add operational, financial and management information systems and personnel,
including personnel to support our research and development programs, any future
commercialization efforts and operations as a public company.

We will not generate revenue from product sales unless and until we successfully
complete clinical development and obtain regulatory approval for RP1 or our
other product candidates. If we obtain regulatory approval for any of our
product candidates and do not enter into a commercialization partnership in any
jurisdiction, we expect to incur significant expenses related to developing our
internal commercialization capability to support product sales, marketing, and
distribution.

As a result, we will need additional funding to support our continuing
operations and pursue our growth strategy. Until such time as we can generate
significant revenue from product sales, if ever, we expect to finance our
operations through a combination of equity offerings, debt financings, lines of
credit, collaborations, strategic alliances, and marketing, distribution, or
licensing arrangements. We may be unable to raise additional funds or enter into
such other agreements or arrangements when needed on favorable terms, or at all.
If we fail to raise capital or enter into such agreements as, and when, needed,
we may have to significantly delay, scale back, or discontinue the development
and commercialization of one or more of our product candidates.

Because of the numerous risks and uncertainties associated with pharmaceutical
product development, we are unable to accurately predict the timing or amount of
increased expenses or when, or if, we will be able to achieve or maintain
profitability. Even if we are able to generate product sales, we may not become
profitable. If we fail to become profitable or are unable to sustain
profitability on a continuing basis, then we may be unable to continue our
operations at planned levels and be forced to reduce or terminate our
operations.

As of March 31, 2022, we had cash and cash equivalents and short-term
investments of $395.7 million. We believe that our existing cash and cash
equivalents and short-term investments will enable us to fund our operating
expenses and capital expenditure requirements through at least 12 months from
the issuance of the consolidated financial statements included in this Annual
Report on Form 10-K.

See "- Liquidity and capital resources" and "Risk factors - Risks related to our financial position and need for additional capital."

The COVID-19 pandemic



We are continuing to monitor the global outbreak and spread of COVID-19 and,
throughout the pandemic, have implemented measures designed to comply with
applicable federal, state and local guidelines, as well as care for our
employee's health and well-being. We will continue to examine our protocols as
the pandemic and health guidance evolves. The COVID-19 pandemic continues to
affect the United States and global economies and has affected and may continue
to affect our operations and those of third parties on which we rely, including
by causing disruptions in our raw material and anti-PD-1 supply, the
manufacturing of our product candidates and our commercialization processes. In
addition, timing of patient enrollment and treatment in certain of our ongoing
clinical studies has been impacted by the pandemic. However, the extent of these
delays is currently unknown and has and will likely continue to vary by clinical
study. In addition, we may incur unforeseen costs as a result of disruptions in
raw material supplies, clinical product supplies, and preclinical studies or
clinical trial delays. The full extent to which the COVID-19 pandemic will
directly or indirectly impact our business, results of operations and financial
condition will depend on future developments that are highly uncertain and
cannot be accurately predicted, including new
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information that may emerge concerning COVID-19, the actions taken in an effort
to contain it or to potentially treat or continue to vaccinate against COVID-19
and the economic impact on local, regional, national and international markets.
We continue to actively monitor this situation and the possible effects on our
financial condition, liquidity, operations, suppliers, supplies, industry and
workforce. For additional information, see "Risk Factors - Our financial
condition and results of operations could be adversely affected by the
coronavirus disease-2019, or COVID-19, outbreak." in Part I, Item 1A of this
Annual Report on Form 10-K.

Components of our results of operations

Revenue



To date, we have not generated any revenue from product sales as we do not have
any approved products and do not expect to generate any revenue from the sale of
products in the near future. If our development efforts for RP1 or any other
product candidates that we may develop in the future are successful and result
in regulatory 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 those collaborations 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:

•expenses incurred under agreements with third parties, including clinical
research organizations, or CROs, that conduct research, preclinical activities
and clinical trials on our behalf as well as contract manufacturing
organizations, or CMOs, that manufacture our product candidates for use in our
preclinical and clinical trials;

•salaries, benefits and other related costs, including stock-based compensation expense, for personnel engaged in research and development functions;

•costs of outside consultants engaged in research and development functions, including their fees, stock-based compensation and related travel expenses;

•the costs of laboratory supplies and acquiring, developing and manufacturing preclinical study and clinical trial materials;

•costs related to compliance with regulatory requirements in connection with the development of our product candidates; and

•facility-related expenses, which include direct depreciation costs and allocated expenses for rent and maintenance of facilities and other operating costs.

These costs will be partially offset by our agreement with Regeneron related to our CERPASS trial.

We expense research and development costs as incurred. We recognize external development costs based on an evaluation of the progress to completion of specific tasks using information provided to us by our service providers. 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 consolidated financial statements as prepaid or accrued research and development expenses.



Our direct external research and development expenses are tracked on a
program-by-program basis and consist of costs, such as fees paid to consultants,
contractors, CMOs, and CROs in connection with our preclinical and clinical
development activities. We do not allocate personnel costs, costs associated
with our discovery efforts, laboratory supplies, and facilities, including
depreciation or other indirect costs, to specific product development programs
because these costs are deployed across multiple product development programs
and, as such, are not separately classified. All non-employee costs associated
with our manufacturing facility have been fully burdened to our RP1 program.

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 that our research and development expenses will continue to increase
for the foreseeable future as we continue enrollment and initiate additional
clinical trials and continue to discover and develop additional product
candidates. The successful development and commercialization of our product
candidates is highly
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uncertain. This is due to the numerous risks and uncertainties associated with product development and commercialization, including the following:

•the scope, rate of progress, expense and results of our ongoing clinical trials, as well as future clinical trials or other product candidates and other research and development activities that we may conduct;

•the number and scope of preclinical and clinical programs we decide to pursue;

•our ability to maintain our current research and development programs and to establish new ones;

•uncertainties in clinical trial design;

•the rate of enrollment in clinical trials;



•the successful completion of clinical trials with safety, tolerability, and
efficacy profiles that are satisfactory to the FDA or any comparable foreign
regulatory authority;

•the receipt of regulatory approvals from applicable regulatory authorities;

•our success in operating our manufacturing facility, or securing manufacturing supply through relationships with third parties;

•our ability to obtain and maintain patents, trade secret protection, and regulatory exclusivity, both in the United States and internationally;

•our ability to maintain, expand and protect our rights in our intellectual property portfolio;

•the commercialization of our product candidates, if and when approved;

•the acceptance of our product candidates, if approved, by patients, the medical community, and third-party payors;

•our ability to successfully develop our product candidates for use in combination with third-party products or product candidates;

•negative developments in the field of immuno-oncology;

•competition with other products; and

•significant and changing government regulation and regulatory guidance.



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. For
example, if the FDA or another regulatory authority were to require us to
conduct clinical trials beyond those that we anticipate will be required for the
completion of clinical development of a product candidate, or if we experience
significant trial delays due to patient enrollment or other reasons, we could be
required to expend significant additional financial resources and time on the
completion of clinical development. We may never succeed in obtaining regulatory
approval for any of our product candidates.

Selling, general and administrative expenses



Selling, general and administrative expenses consist primarily of salaries and
other related costs, including stock-based compensation, for personnel in our
executive, finance, corporate, commercial, and business development and
administrative functions. Selling, general and administrative expenses also
include professional fees for legal, patent, accounting, auditing, tax and
consulting services, pre-commercial planning, travel expenses, and
facility-related expenses, which include direct depreciation costs and allocated
expenses for rent and maintenance of facilities and other operating costs.

We expect that our selling, general and administrative expenses will continue to
increase in the future as we increase our selling, general and administrative
headcount to support our continued research and development and pre-launch
activities to prepare for potential commercialization of our product candidates.
We also expect to continue to incur increased expenses, including accounting,
audit, legal, regulatory and tax-related services associated with maintaining
compliance with exchange listing and SEC requirements; director and officer
insurance costs; and investor and public relations costs.

Other income (expense), net

Research and development incentives



Research and development incentives consists of reimbursements of research and
development expenditures. We participate, through our subsidiary in the United
Kingdom, in the research and development program provided by the United
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Kingdom tax relief program, such that a percentage of up to 14.5% of our qualifying research and development expenditures are reimbursed by the United Kingdom government, and such incentives are reflected as other income.

Investment income

Investment income consists of income earned on our cash and cash equivalents and short-term investments.

Interest expense on finance lease liability

Interest expense on finance lease liability consists of amortization of finance charges under our financing lease.

Interest expense on debt obligations

Interest expense on debt obligations consists of the amortization of debt discount and cash paid for interest under the term loan facility with Hercules.

Loss on extinguishment of debt

Loss on extinguishment of debt consists of the loss from extinguishment of debt obligations under the term loan facility with Hercules.

Other income (expense), net

Other income (expense), net consists primarily of realized and unrealized foreign currency transaction gains and losses.

Income taxes



Since our inception and through March 31, 2022, we have not recorded any income
tax benefits for the net losses we incurred in each jurisdiction in which we
operate, as we believe, based upon the weight of available evidence, that it is
more likely than not that all of our net operating loss carryforwards will not
be realized.

Results of operations

Comparison of the years ended March 31, 2022 and 2021

The following table summarizes our results of operations for the years ended March 31, 2022 and 2021:



                                                    Year Ended March 31,                            Change
                                                  2022                  2021                $                   %
                                                            (Amounts in thousands)
Operating expenses:
Research and development                    $    79,545             $  56,754          $  22,791                   40  %
Selling, general and administrative              38,769                23,201             15,568                   67  %
Total operating expenses                        118,314                79,955             38,359                   48  %
Loss from operations                           (118,314)              (79,955)           (38,359)                  48  %
Other income (expense):
Research and development incentives               3,170                 2,807                363                   13  %
Investment income                                   390                   916               (526)                 (57) %
Interest expense on finance lease liability      (2,223)               (2,242)                19                   (1) %
Loss on extinguishment of debt                        -                  (913)               913                 (100) %
Interest expense on debt obligations                  -                  (818)               818                 (100) %
Other (expense) income                           (1,059)                 (665)              (394)                  59  %
Total other income (expense), net                   278                  (915)             1,193                 (130) %
Net loss                                       (118,036)              (80,870)           (37,166)                  46  %


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Research and development expenses



Research and development expenses for the year ended March 31, 2022 were $79.5
million, compared to $56.8 million for the year ended March 31, 2021. The
following table summarizes our research and development expenses for the years
ended March 31, 2022 and 2021:

                                                    Year Ended March 31,                            Change
                                                  2022                  2021                $                   %
Direct research and development expenses by
program:
RP1                                              16,291                27,517            (11,226)                (41) %
RP2                                              13,958                 3,004             10,954                 365  %
RP3                                               1,227                     -              1,227                 100  %
Unallocated research and development
expenses:                                                                                      -
Personnel related (including stock-based
compensation)                                    37,528                22,939             14,589                  64  %
Other                                            10,541                 3,294              7,247                 220  %
Total research and development expenses     $    79,545             $  56,754          $  22,791                  40  %


The change in our direct research and development expenses between our product
candidates is associated with technology transfer, process development,
qualification and comparability of our in-house manufactured materials compared
to our third-party manufactured materials in readiness for utilizing our product
candidates made at our in-house manufacturing facility in our clinical
development programs and preparation for potential commercial manufacture, if
approved. Manufacturing continued to focus on RP2 and RP3 technology transfers
and process development during the fourth quarter, as well as continued
readiness for clinical trial development of these product candidates made at our
in-house facility.

The increase of $21.8 million in our unallocated expenses was due primarily to a
$14.6 million increase in personnel-related costs, including a $11.6 million
increase in payroll and fringe benefits and a stock-based compensation increase
of $2.8 million. The increase in personnel-related costs largely reflected the
hiring of additional personnel in our research and development functions as we
expand the development plan in multiple indications. Personnel related costs for
the years ended March 31, 2022 and 2021 included stock-based compensation
expense of $8.6 million and $5.7 million, respectively. Additionally, the
increase in other expenses is largely driven by $3.2 million of increased costs
related to our manufacturing facility and related lease costs, as well as an
increase of $1.9 million in research costs and an increase of $0.9 million in
lab supplies.

Selling, general and administrative expenses



Selling, general and administrative expenses were $38.8 million for the year
ended March 31, 2022, compared to $23.2 million for the year ended March 31,
2021. The increase of $15.6 million is primarily the result of an increase of
$13.1 million in personnel related costs, including a stock-based compensation
increase of $9.6 million, an increase of $3.2 million in payroll and fringe
benefits and a $0.3 million increase in travel and entertainment. The increase
in personnel related costs was driven by the continued hiring of additional
personnel in our selling, general and administrative functions, including the
addition of commercial personnel associated with pre-launch commercial planning
and initial build of the Company's commercial infrastructure, which accounts for
approximately $1.7 million of the increase compared to prior year, as we expand
our operations.

Total other income (expense), net



Other income (expense) for the year ended March 31, 2022 was $0.3 million
compared to $(0.9) million for the year ended March 31, 2021. The net change of
$1.2 million is primarily attributable to a decrease in expense of $0.9 million
as a result of a loss related to the extinguishment of debt in the prior year
which did not recur in the current year, as well as a decrease in expense of
$0.8 million as a result of interest expense on the aforementioned debt
obligations in the prior year which did not recur during the current year.
Furthermore, the Company earned approximately $0.5 million more in interest
income on investments in the prior year as compared to the current year, and
there is an increase in expense of $0.4 million in the current year due to the
changes in foreign exchange rates of the Great British Pound to United States
Dollar.

Liquidity and capital resources



Since our inception, we have not generated any revenue from product sales and
have incurred significant operating losses and negative cash flows from our
operations. We have not yet commercialized any of our product candidates, which
are in
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various phases of preclinical and clinical development, and we do not expect to
generate revenue from sales of any products for the foreseeable future, if at
all.

Sources of liquidity

To date, we have financed our operations primarily with proceeds from the sale
of equity securities and, to a lesser extent, proceeds from the issuance of
debt. Through March 31, 2022, we had received net proceeds of $655.8 million
from our sales of equity securities and $10.0 million from our incurrence of
debt under the term loan facility with Hercules, which was repaid in full in
December 2020. As of March 31, 2022, we had cash and cash equivalents and
short-term investments of $395.7 million.

In July 2018, we completed our IPO and issued and sold 7,407,936 shares of our
common stock at a public offering price of $15.00 per share, resulting in net
proceeds of $101.2 million after deducting underwriting discounts, commissions
and other offering expenses of approximately $9.9 million. In the fourth
calendar quarter of 2019, we closed a registered public offering for the
issuance and sale of 4,516,561 shares of our common stock at a public offering
price of $13.61 per share and pre-funded warrants to purchase 2,200,000 shares
of our common stock at a purchase price of $13.6099 per pre-funded warrant,
which was equal to the public offering price per share of the common stock less
the $0.0001 per share exercise price of each pre-funded warrant. We received
aggregate net proceeds of approximately $85.6 million after deducting
underwriting discounts, commissions and other offering expenses of approximately
$5.8 million. In June 2020, we closed a second registered public offering for
the issuance and sale of 3,478,261 shares of our common stock at a public
offering price of $23.00 per share and pre-funded warrants to purchase 1,521,738
shares of our common stock at a purchase price of $22.9999 per pre-funded
warrant, which was equal to the public offering price per share of common stock
less the $0.0001 per share exercise price of each pre-funded warrant. We
received aggregate net proceeds of approximately $107.8 million after deducting
underwriting discounts, commissions and other offering expenses of approximately
$7.2 million. In October 2020, we closed a third registered public offering for
the issuance and sale of 5,625,000 shares of our common stock at a public
offering price of $40.00 per share and pre-funded warrants to purchase 1,562,500
shares of our common stock at a purchase price of $39.9999 per pre-funded
warrant, the public offering price per share of common stock less the $0.0001
per share exercise price of each pre-funded warrant. We received aggregate net
proceeds of approximately $270.0 million after deducting underwriting discounts,
commissions and other offering expenses of approximately $17.5 million.

In addition to registered public equity offerings, we also established an
at-the-market offering program pursuant to a sales agreement that we entered
into with SVB Leerink LLC, or the Agent, on August 8, 2019, or the 2019 Sales
Agreement. Under the 2019 Sales Agreement, and prior to its amendment in
June 2020, we could sell from time to time, at our option, up to an aggregate of
$75.0 million of shares of our common stock. In June 2020, we amended the 2019
Sales Agreement to reduce the aggregate offering amount thereunder from
$75.0 million to $30.0 million. We sold 287,559 shares of our common stock under
the 2019 Sales Agreement for net proceeds of approximately $4.4 million. On
August 11, 2020, in connection with our entry into separate sales agreement with
the Agent, or the 2020 Sales Agreement, we and the Agent mutually agreed to
terminate the 2019 Sales Agreement. Under the 2020 Sales Agreement, and prior to
its amendment in October 2020, we could sell from time to time, at our option,
up to an aggregate of $75.0 million of shares of our common stock. In
October 2020, we amended the 2020 Sales Agreement to reduce the aggregate
offering amount thereunder from $75.0 million to $62.5 million. We did not issue
or sell any shares of our common stock under the 2020 Sales Agreement during the
year ended March 31, 2022. For additional information, see Note 17, Subsequent
events, of the "notes to Consolidated Financial Statements" contained in Part
II, Item 8 of this Annual Report on Form 10-K.

Our incurrence of debt was conducted entirely under the Hercules Loan Agreement,
as amended, pursuant to which we borrowed $10.0 million of a maximum of
$40.0 million. On December 15, 2020, we entered into a Payoff Letter with
Hercules and paid a total of $10.8 million to Hercules in connection therewith,
representing the outstanding principal, accrued and unpaid interest, fees, costs
and expense due and owed to Hercules, thereby terminating the Hercules Loan
Agreement and the related loan documents.

Cash flows

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


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                                                                         Year Ended March 31,
                                                                        2022                 2021
                                                                        (Amounts in thousands)
Net cash used in operating activities                             $     (82,180)         $ (61,389)
Net cash (used in) provided by investing activities                      (1,806)          (188,776)
Net cash provided by financing activities                                 6,598            372,462
Effect of exchange rate changes on cash and cash equivalents                818                721
Net (decrease) increase in cash and cash equivalents              $     (76,570)         $ 123,018


Operating activities

During the year ended March 31, 2022, net cash used in operating activities was
$82.2 million, primarily resulting from our net loss of $118.0 million,
partially offset by non-cash charges of $28.6 million, consisting of stock-based
compensation expense of $24.3 million and $4.4 million of expense related to
depreciation and amortization and net amortization of premiums and discounts on
short-term investments, and an increase in cash of $7.2 million related to
changes in our operating assets and liabilities. Changes in our operating assets
and liabilities for the year ended March 31, 2022 consisted primarily of a $4.7
million increase in accrued expenses and other current liabilities, a net $2.5
million change in operating and financing right-of-use assets and lease
liabilities, a $1.1 million increase in accounts payable and a $0.8 million
increase in prepaid expenses and other current assets, as well as a $0.2 million
increase in research and development incentives receivable from the United
Kingdom government due to the timing and amount of qualifying expenditures.

During the year ended March 31, 2021, net cash used in operating activities was
$61.4 million, primarily resulting from our net loss of $80.9 million, partially
offset by an increase in non-cash charges of $16.0 million, primarily consisting
of stock-based compensation expense, and an increase in cash of $3.5 million
related to changes in our operating assets and liabilities. Changes in our
operating assets and liabilities for the year ended March 31, 2021 consisted
primarily of a $3.4 million increase in accrued expenses and other current
liabilities, a net $2.5 million change in operating and financing right-of-use
assets and lease liabilities, a $1.7 million decrease in prepaid expenses and
other current assets, a $1.0 million decrease in accounts payable and a
$0.3 million decrease in research and development incentives receivable from the
United Kingdom government due to the timing and amount of our qualifying
expenditures. The changes in accounts payable were primarily due to the timing
of vendor invoicing and payments.

Investing activities



During the year ended March 31, 2022, net cash used in investing activities was
$1.8 million, consisting of $255.7 million in purchases of available for sale
securities and $2.3 million in purchases of property, plant and equipment,
offset by $256.3 million in proceeds from sales and maturities of short-term
investments.

During the year ended March 31, 2021, net cash used in investing activities was
$188.8 million, consisting of $392.4 million in purchases of available for sale
securities which were primarily driven by the receipt of proceeds from two
registered public offerings during the fiscal year ended March 31, 2021, as well
as $2.4 million in purchases of property, plant and equipment, partially offset
by $206.1 million in proceeds from sales and maturities of short-term
investments.

Financing Activities

During the year ended March 31, 2022, net cash provided by financing activities was $6.6 million, consisting primarily of $6.9 million in proceeds from the exercise of stock options.



During the year ended March 31, 2021, net cash provided by financing activities
was $372.5 million, consisting of $286.1 million from the issuance of common
stock, $91.7 million from the issuance of pre-funded warrants to purchase common
stock, $5.7 million in proceeds from the exercise of stock options, partially
offset by $10.0 million in debt payments under the Hercules Loan Agreement and
$0.8 million of fees associated with the extinguishment of the obligations under
the Hercules Loan Agreement.

Hercules Loan Agreement

On August 8, 2019 and as amended on June 1, 2020, we and certain of our affiliates entered into the Hercules Loan Agreement with Hercules, which provided for aggregate borrowings of up to $40 million in the form of term loans. We borrowed $10.0 million at closing under the Hercules Loan Agreement in August 2019 and subject to the achievement of certain milestones, had the ability to borrow the unused $30.0 million available in three separate $10.0 million advances


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between October 1, 2020 and December 15, 2020, July 1, 2020 and June 30, 2021, and July 1, 2021 and December 15, 2021, respectively.



On December 15, 2020, we entered into a Payoff Letter with respect to the
Hercules Loan Agreement. Pursuant to the Payoff Letter, we paid a total of
$10.8 million to Hercules, representing the outstanding principal, accrued and
unpaid interest, fees, costs and expenses due and owed to Hercules under the
Hercules Loan Agreement. Upon the execution of the Payoff Letter, in repayment
of all of our outstanding obligations thereunder, the Hercules Loan Agreement
and the related loan documents were terminated.

Borrowings under the Hercules Loan Agreement bore interest at a rate per annum
equal to 8.75%. Under the Hercules Loan Agreement, we were required to make
monthly interest-only payments through September 1, 2022. As of March 31, 2022,
there was no amount outstanding under the Hercules Loan Agreement due and owing.

The Term Loan Facility with Hercules was secured by substantially all of our
assets, excluding our intellectual property, and subject to certain exceptions
and exclusions. All liens on our assets held by Hercules were released in
connection with the execution of the Payoff Letter.

Funding requirements



Our plan of operation is to continue implementing our business strategy,
continue research and development of RP1 and our other product candidates and
continue to expand our research pipeline and our internal research and
development capabilities. 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 and if and
as we:

•conduct our current and future clinical trials with RP1, RP2 and RP3;

•further preclinical development of our RPx platform;

•operate, qualify and maintain our own in-house manufacturing facility;

•seek to identify and develop additional product candidates;

•seek marketing approvals for any of our product candidates that successfully complete clinical trials, if any;

•establish a sales, marketing and distribution infrastructure to commercialize any products for which we may obtain marketing approval;

•until our planned manufacturing facility is fully validated, continued limited manufacturing by third parties for clinical development.

•maintain, expand and protect our intellectual property portfolio;

•acquire or in-license other drugs and technologies; and



•add operational, financial and management information systems and personnel,
including personnel to support our research and development programs, any future
commercialization efforts and operations as a public company.

As of March 31, 2022, we had cash and cash equivalents and short-term
investments of $395.7 million. We believe that our existing cash, cash
equivalents and short-term investments as of March 31, 2022, will enable us to
fund our overall operations into the second half of calendar 2024, excluding any
confirmatory trial required by the FDA or other regulatory body. We have based
these estimates on assumptions that may prove to be wrong, and we could utilize
our available capital resources sooner than we expect.

Because of the numerous risks and uncertainties associated with the development
of RP1 and other 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 capital
requirements will depend on many factors, including those described in this
section and above under "- Operating expenses - Research and development
expenses."

Developing novel biopharmaceutical products, including conducting preclinical
studies and clinical trials, is a time-consuming, expensive and uncertain
process that takes years to complete, and we may never generate the necessary
data or results required to obtain marketing approval for any product candidates
or generate revenue from the sale of any products for which we may obtain
marketing approval. In addition, our product candidates, if approved, may not
achieve commercial success. Our commercial revenues, if any, will be derived
from sales of therapies that we do not expect to be commercially
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available for many years, if ever. Accordingly, we will need to obtain substantial additional funds to achieve our business objectives.



Adequate additional funds may not be available to us on acceptable terms, or at
all. We do not currently have any committed external source of funds. To the
extent that we raise additional capital through the sale of our equity or
convertible debt securities, our shareholders' interest may be diluted, and the
terms of these securities may include liquidation or other preferences and
anti-dilution protections that could adversely affect the rights of our common
stockholder. Additional debt or preferred equity financing, if available, may
involve agreements that include restrictive covenants that may limit our ability
to take specific actions, such as incurring debt adversely impact our ability to
conduct our business, and may require the issuance of warrants, which could
potentially dilute your ownership interest.

If we raise additional funds through collaborations, strategic alliances or
licensing arrangements with third parties, we may have to relinquish valuable
rights to our technology, future revenue streams, research programs, or product
candidates or grant licenses on terms that may not be favorable to us. If we are
unable to raise additional funds through equity or debt financings or
collaborations, strategic alliances or licensing arrangements with third parties
when needed, we may be required to delay, limit, reduce and/or terminate our
product development programs or any future commercialization efforts or grant
rights to develop and market product candidates that we would otherwise prefer
to develop and market ourselves.

Contractual obligations and commitments



We have entered into arrangements that contractually obligate us to make
payments that will affect our liquidity and cash flows in future periods. Our
contractual obligations primarily consist of our obligations under our operating
and financing leases, as well as costs associated with contracts entered into in
the normal course of business with CROs, CMOs and other third parties for
clinical trials and preclinical research studies and testing.

As of March 31, 2022, the aggregate amount of future lease payments is approximately $60.0 million, with $3.6 million due within one year. For additional information on our leases and timing of future payments, see Note 12 Commitments and contingencies, of the "notes to Consolidated Financial Statements" contained in Part II, Item 8 of this Annual Report on Form 10-K.



Manufacturing and research commitments include agreements that are enforceable
and legally binding on us and that specify all significant terms, including
fixed or minimum quantities to be purchased; fixed, minimum or variable price
provisions; and the approximate timing of the transaction. As of March 31, 2022,
the aggregate amount of non-cancelable purchase obligations related to such
manufacturing commitments are approximately $2.0 million and all of this balance
is due within one year.

Collaborations

BMS

In February 2018, we entered into a Clinical Trial Collaboration and Supply
Agreement with Bristol-Myers Squibb Company, or BMS. Pursuant to the agreement,
BMS is providing to us, at no cost, nivolumab, its anti-PD-1 therapy, for use in
combination with RP1 in our ongoing Phase 1/2 clinical trial. Under the
agreement, we will sponsor, fund and conduct the clinical trial in accordance
with an agreed-upon protocol. BMS granted us a non-exclusive, non-transferrable,
royalty-free license (with a right to sublicense) under its intellectual
property to use nivolumab in the clinical trial and has agreed to supply
nivolumab, at no cost to us, for use in the clinical trial. Both parties will
own the study data produced in the clinical trial, other than study data related
solely to nivolumab, which will belong solely to BMS, or study data related
solely to RP1, which will belong solely to us. In January 2020, this agreement
was expanded to cover an additional cohort of 125 patients with anti-PD-1 failed
melanoma.

Unless earlier terminated, the agreement will remain in effect until (i) the
completion of the clinical trial, (ii) all related clinical trial data have been
delivered to both parties and (iii) the completion of any statistical analyses
and bioanalyses contemplated by the clinical trial protocol or any analysis
otherwise agreed upon by the parties. The agreement may be terminated by either
party (x) in the event of an uncured material breach by the other party, (y) in
the event the other party is insolvent or in bankruptcy proceedings or (z) for
safety reasons. Upon termination, the licenses granted to us to use nivolumab in
the clinical trial will terminate. The agreement contains representations,
warranties, undertakings and indemnities customary for a transaction of this
nature.

In April 2019, we entered into a separate agreement with BMS on terms similar to
the terms set forth in the agreement described above, pursuant to which BMS will
provide, at no cost to us, nivolumab for use in our Phase 1 clinical trial of
RP2 in combination with nivolumab.
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Regeneron



In May 2018, we entered into a Master Clinical Trial Collaboration and Supply
Agreement with Regeneron Pharmaceuticals, Inc., or Regeneron. Pursuant to the
agreement we agreed to undertake one or more clinical trials with Regeneron for
the administration of our product candidates in combination with cemiplimab, an
anti-PD-1 therapy developed by Regeneron, across multiple solid tumor types, the
first of which is our ongoing Phase 2 clinical trial testing RP1 in combination
with cemiplimab versus cemiplimab alone in patients with CSCC. Each clinical
trial will be conducted pursuant to an agreed study plan which, among other
things, will identify the name of the sponsor and which party will manage the
particular study, and include the protocol, the budget and a schedule of
clinical obligations. The first study plan related to the Phase 2 clinical trial
in CSCC has been agreed.

Pursuant to the terms of the agreement, each party granted the other party a
non-exclusive license of their respective intellectual property and agreed to
contribute the necessary resources needed to fulfill their respective
obligations, in each case, under the terms of agreed study plans. Development
costs of a particular clinical trial will be split equally. The agreement
contains representations, warranties, undertakings and indemnities customary for
a transaction of this nature. The agreement also contains certain time-based
covenants that restrict us from entering into a third-party arrangement with
respect to the use of our product candidates in combination with an anti-PD-1
therapy and that restrict Regeneron from entering into a third-party arrangement
with respect to the use of cemiplimab in combination with an HSV-1 virus, in
each case, for the treatment of a tumor type that is the subject of a clinical
trial to which the covenants apply. Unless otherwise mutually agreed in a future
study plan, these covenants are only applicable to our ongoing Phase 2 clinical
trial in CSCC.

The agreement may be terminated by either party if (i) there is no active study
plan for which a final study report has not been completed and the parties have
not entered into a study plan for an additional clinical trial within a period
of time after the delivery of the most recent final study report or (ii) in the
event of a material breach.

Critical accounting policies and estimates



Our management's discussion and analysis of financial condition and results of
operations is based on our consolidated financial statements, which have been
prepared in accordance with generally accepted accounting principles in the
United States. The preparation of our consolidated 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 consolidated 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 evaluate our estimates and assumptions on an ongoing basis.
Our actual results may differ from these estimates under different assumptions
or conditions.

While our significant accounting policies are described in greater detail in
Note 2 to our consolidated financial statements appearing elsewhere in this
Annual Report on Form 10-K, we believe that the following accounting policies
are those most critical to the judgments and estimates used in the preparation
of our consolidated financial statements.

Accrued research and development expenses



As part of the process of preparing our consolidated financial statements, we
are required to estimate our accrued research and development expenses. This
process involves reviewing open contracts and purchase orders, communicating
with our personnel to identify services that have been performed on our behalf
and estimating the level of service performed and the associated cost incurred
for the service when we have not yet been invoiced or otherwise notified of
actual costs. The majority of our service providers invoice us in arrears for
services performed, on a pre-determined schedule or when contractual milestones
are met; however, some require advanced payments. We make estimates of our
accrued expenses as of each balance sheet date in the consolidated financial
statements based on facts and circumstances known to us at that time. Examples
of estimated accrued research and development expenses include fees paid to:

•CROs in connection with performing research activities and conducting preclinical studies and clinical trials on our behalf;

•CMOs in connection with the production of preclinical and clinical trial materials;

•investigative sites or other service providers in connection with clinical trials;

•vendors in connection with preclinical and clinical development activities; and

•vendors related to product manufacturing and development and distribution of preclinical and clinical supplies.


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We base our expenses related to preclinical studies and clinical trials on our
estimates of the services received and efforts expended pursuant to quotes and
contracts with multiple CMOs and CROs that supply, conduct and manage
preclinical studies and clinical trials on our behalf. The financial terms of
these agreements are subject to negotiation, vary from contract to contract and
may result in uneven payment flows. There may be instances in which payments
made to our vendors will exceed the level of services provided and result in a
prepayment of the expense. Payments under some of these contracts depend on
factors such as the successful enrollment of patients and the completion of
clinical trial milestones. In accruing service fees, we estimate the time period
over which services will be performed and the level of effort to be expended in
each period. If the actual timing of the performance of services or the level of
effort varies from the estimate, we adjust the accrual or the amount of prepaid
expenses accordingly. Although we do not expect our estimates to be materially
different from amounts actually incurred, our understanding of the status and
timing of services performed relative to the actual status and timing of
services performed may vary and may result in reporting amounts that are too
high or too low in any particular period. To date, there have not been any
material adjustments to our prior estimates of accrued research and development
expenses.

Stock-based compensation

We issue stock-based awards to employees, directors, consultants and
non-employees in the form of stock options and restricted stock units. We
measure such stock-based awards in accordance with ASC 718, Compensation - Stock
Compensation, which requires all stock-based awards to be recognized in the
consolidated statements of operations and comprehensive loss based on their fair
value on the date of the grant and the related compensation expense for those
awards is recognized over the requisite service period, which is generally the
vesting period of the respective award. We have, to date, only issued
stock-based awards with service-based vesting conditions and record the expense
for these awards using the straight-line method. The fair value of each stock
option grant is estimated on the date of grant using the Black-Scholes
option-pricing model, which requires inputs based on certain subjective
assumptions, including the expected stock price volatility, the expected term of
the option, the risk-free interest rate for a period that approximates the
expected term of the option, and our expected dividend yield. See Note 9 of the
"Notes to Consolidated Financial Statements" contained in Part II, Item 8 of
this Annual Report on Form 10-K for more information. Forfeitures are accounted
for as they occur. The fair value of each stock-based award is estimated on the
date of grant based on the fair value of our common stock on that same date.

We classify stock-based compensation expense in our consolidated statements of
operations in the same manner in which the award recipient's payroll costs are
classified or in which the award recipient's service payments are classified.

Recently issued accounting pronouncements



Refer to Note 2, summary of significant accounting policies of the "Notes to
Consolidated Financial Statements" contained in Part II, Item 8 of this Annual
Report on Form 10-K for a description of recent accounting pronouncements that
are applicable to our business and may potentially have an impact on our
financial position and results of operations

Emerging growth company status



As an "emerging growth company," the Jumpstart Our Business Startups Act of 2012
permits 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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