The following information should be read in conjunction with our unaudited
condensed financial statements and the notes thereto included in this Quarterly
Report on Form 10-Q and the audited financial information and the notes thereto
included in our Annual Report on Form 10-K, which was filed with the Securities
and Exchange Commission, or the SEC, on March 30, 2022, or the Annual Report.

Except for the historical information contained herein, the matters discussed in
this Quarterly Report on Form 10-Q may be deemed to be forward-looking
statements that involve risks and uncertainties. We make such forward-looking
statements pursuant to the safe harbor provisions of the Private Securities
Litigation Reform Act of 1995 and other federal securities laws. In this
Quarterly Report on Form 10-Q, words such as "may," "expect," "anticipate,"
"estimate," "intend," "plan," and similar expressions (as well as other words or
expressions referencing future events, conditions or circumstances) are intended
to identify forward-looking statements.

Our actual results and the timing of certain events may differ materially from
the results discussed, projected, anticipated, or indicated in any
forward-looking statements. 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 Quarterly Report. In addition, 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
Quarterly Report, they may not be predictive of results or developments in
future periods.

The following information and any forward-looking statements should be considered in light of factors discussed elsewhere in this Quarterly Report on Form 10-Q, including those risks identified under Part II, Item 1A. Risk Factors.



We caution readers not to place undue reliance on any forward-looking statements
made by us, which speak only as of the date they are made. 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 oncology-focused cell therapy company developing
adoptive TCR-T cell therapy, designed to treat multiple solid tumor types in
large cancer patient populations with unmet clinical needs. We are leveraging
our cancer hotspot mutation TCR library and our proprietary, non-viral Sleeping
Beauty gene transfer platform to design and manufacture patient-specific cell
therapies that target neoantigens arising from shared tumor-specific mutations
in key oncogenic genes, including KRAS, TP53, and EGFR. In collaboration with
the MD Anderson Cancer Center, or MD Anderson, we are currently enrolling
patients for a Phase 1/2 clinical trial evaluating ten TCRs reactive to mutated
KRAS, TP53, and EGFR from our TCR library for the investigational treatment of
non-small cell lung, colorectal, endometrial, pancreatic, ovarian, and bile
duct, which we refer to as our TCR-T Library Phase 1/2 Trial. On May 2, 2022, we
announced that we treated our first patient in this trial; we anticipate
reporting interim data in the second half of 2022.

We have not generated any product revenue and have incurred significant net
losses in each year since our inception. For the three months ended March 31,
2022, we had a net loss of $9.8 million, and as of March 31, 2022, we have
incurred approximately $852.6 million of accumulated deficit since our inception
in 2003. We expect to continue to incur significant operating expenditures and
net losses. Further development of our product candidates will likely require
substantial increases in our expenses as we:

continue to undertake clinical trials for product candidates;

seek regulatory approvals for product candidates;

work with regulatory authorities to identify and address program-related inquiries;

implement additional internal systems and infrastructure;

hire additional personnel; and

scale-up the formulation and manufacturing of our product candidates.



We continue to seek additional financial resources to fund the further
development of our product candidates. If we are unable to obtain sufficient
additional capital, one or more of these programs could be delayed, and we may
be unable to continue our operations at planned levels and be forced to reduce
our operations. Because of the numerous risks and uncertainties associated with
product development, we are unable to predict the timing or amount of increased
expenses or when or if we will be able to achieve or maintain profitability.

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Recent Developments



On September 27, 2021, we announced a restructuring designed to enable us to
focus on and advance our TCR program. As a result of the restructuring,
approximately 60 positions were eliminated, and we were able to extend our
anticipated cash runway. Given our current development plans and cash management
efforts, we anticipate cash resources will be sufficient to fund operations into
the second quarter of 2023.

The ongoing COVID-19 global pandemic has presented a significant health and
economic challenge around the world and may affect our employees, partners and
business operations. 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. Supply chain disruptions caused by the pandemic
may negatively impact productivity, disrupt our business and delay our clinical
programs and timelines. The severity of negative impacts will depend, in part,
on the length and magnitude of the disruptions. These and perhaps more severe
disruptions in our operations could negatively impact our business, operating
results and financial condition. We continue to work with our partners to
mitigate the impact the COVID-19 pandemic is having on our business.

On May 2, 2022, we announced dosing of the first patient in our TCR-T Library Phase 1/2 trial being conducted at MD Anderson. The TCR-T cell product was successfully manufactured in Alaunos' cGMP facility in Houston, Texas. We continue to enroll patients in the trial at dose levels according to the clinical protocol. We expect to present interim data at an appropriate scientific or medical conference in the second half of 2022.



On May 16, 2022, we presented preclinical data in poster M-234 on Stem-cell
memory TCR-T cells targeting hotspot EGFR, KRAS and TP53 neoantigens generated
through co-expression of membrane-bound Interleukin-15, or mbIL-15, at the 25th
Annual Meeting of the American Society of Gene and Cell Therapy. Our mbIL-15
program is designed to augment the function of TCR-T cells by co-expression of a
proprietary potentially more potent mbIL-15. In this preclinical study, we
observed that mbIL-15 TCR-T cells specifically targeted and killed tumors
expressing matching neoantigen and HLAs with negligible off-target effects.
Importantly, mbIL-15 seems to enhance the survival and persistence of TCR-T
cells cultured in the absence of exogenous cytokine support. The persisting
mbIL-15 TCR-T cells were observed to exhibit a preponderance of long-lived T
stem-cell memory cells that were capable to giving rise to effector T cell
subsets upon in vitro restimulation. These preclinical observations suggest that
our proprietary mbIL-15 technology has the potential to establish long-lived
tumor-specific TCR-T cells that may have the potential to survive in circulation
and in the suppressive tumor microenvironment.

Financial Overview

Collaboration Revenue



We recognize research and development funding revenue over the estimated period
of performance. To date we have not generated product revenue. Unless and until
we receive approval from the FDA and/or other regulatory authorities for our
product candidates, we cannot sell our products and will not have product
revenue.

Research and Development Expenses



Our research and development expenses consist primarily of salaries and related
expenses for personnel, costs of contract manufacturing services, costs of
facilities, reagents, and equipment, fees paid to professional service providers
in conjunction with our clinical trials, fees paid to contract research
organizations in conjunction with clinical trials, fees paid to contract
research organizations in conjunction with costs of materials used in research
and development, consulting, license and milestone payments and sponsored
research fees paid to third parties.

Our future research and development expenses in support of our current and
future programs will be subject to numerous uncertainties in timing and cost to
completion. We test potential products in numerous preclinical studies for
safety, toxicology and efficacy. We may conduct multiple clinical trials for
each product. As we obtain results from trials, we may elect to discontinue or
delay clinical trials for certain products in order to focus our resources on
more promising products or indications. Completion of clinical trials may take
several years or more, and the length of time generally varies substantially
according to the type, complexity, novelty and intended use of a product. It is
not unusual for preclinical and clinical development of each of these types of
products to require the expenditure of substantial resources.

The duration and the cost of clinical trials may vary significantly over the life of a project as a result of differences arising during clinical development, including, among others, the following:

The number of clinical sites included in the trials;

The length of time required to enroll suitable patients;

The number of patients that ultimately participate in the trials;

The length of time and cost to develop and optimize manufacturing processes;


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The cost to manufacture the clinical products for patients;

The duration of patient follow-up to ensure the absence of long-term product-related adverse events; and

The efficacy and safety profile of the product.



As a result of the uncertainties discussed above, we are unable to determine the
duration and completion costs of our programs or when and to what extent we will
receive cash inflows from the commercialization and sale of a product. Our
inability to complete our programs in a timely manner or our failure to enter
into appropriate collaborative agreements could significantly increase our
capital requirements and could adversely impact our liquidity. These
uncertainties could force us to reduce or eliminate our activities in one or
more of our programs or seek additional, external sources of financing from
time-to-time in order to continue with our product development strategy. Our
inability to raise additional capital, or to do so on terms reasonably
acceptable to us, would jeopardize the future success of our business.

General and Administrative Expenses



General and administrative expenses consist primarily of salaries, benefits and
stock-based compensation, consulting and professional fees, including patent
related costs, general corporate costs and facility costs not otherwise included
in research and development expenses or cost of product revenue.

Other Income (Expense)

Other income (expense) consists primarily of interest expense associated with our Amended Loan and Security Agreement, as defined below.

Overview of Results of Operations

Three Months Ended March 31, 2022 Compared to Three Months Ended March 31, 2021

Research and Development Expenses



Research and development expenses during the three months ended March 31, 2022
and 2021 were as follows:

                                             Three Months Ended March 31,
                                              2022                 2021                   Change

($ in thousands) Research and development expenses $ 5,580 $ 13,336 $ (7,756 ) (58 )%





Research and development expenses for the three months ended March 31, 2022
decreased by $7.8 million, or 58%, when compared to the three months ended March
31, 2021 primarily due to a decrease in program-related costs of $2.8 million as
a result of the winding down of our IL-12 and CAR-T programs, a $4.7 million
decrease in employee related expenses due to our reduced headcount following our
restructuring in the third quarter of 2021, and a $0.3 million decrease in
consulting expenses due to a decreased reliance on consultants.

For the three months ended March 31, 2022, our clinical stage projects included our TCR-T Library Phase 1/2 trial evaluating TCRs from our library for the investigational treatment of non-small cell lung, colorectal, endometrial, pancreatic, ovarian, and bile duct cancers.

General and administrative expenses



General and administrative expenses during the three months ended March 31, 2022
and 2021 were as follows:

                                            Three Months Ended March 31,
                                              2022                2021                  Change
($ in thousands)
General and administrative expenses       $       3,505       $       8,227

$ (4,722 ) (57 )%





General and administrative expenses for the three months ended March 31, 2022
decreased by $4.7 million as compared to the three months ended March 31, 2021,
primarily due to a $3.6 million decrease in employee related expenses due to our
reduced headcount following our restructuring in the third quarter of 2021, a
$0.8 million decrease in consulting and professional services expenses due to
lower legal costs and a decreased use of consultants, and a $0.2 million
decrease in facilities and other expenses.


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Other income (expense), net



Other income (expense), net during the three months ended March 31, 2022 and
2021 was as follows:

                                 Three Months Ended March 31,
                                     2022                   2021            Change
($ in thousands)
Interest expense              $             (683 )         $    -     $ (683 )       100 %
Other income (expense), net                  (20 )              9        (29 )      (322 )%
Total                         $             (703 )         $    9     $ (712 )     (7911 )%



Other expense, net for the three months ended March 31, 2022 increased by $0.7
million as compared to the three months ended March 31, 2021, primarily due to
$0.7 million of interest expense associated with our Amended Loan and Security
Agreement, as defined below.

Liquidity and Capital Resources

Sources of Liquidity

We have not generated any revenue from product sales. Since inception, we have incurred net losses and negative cash flows from our operations.



To date, we have financed our operations primarily through public offerings of
our common stock, private placements of our convertible equity securities, term
debt and collaborations. Through March 31, 2022, we have received an aggregate
of $714.1 million from issuances of equity and $25.0 million from our Amended
Loan and Security Agreement, as defined below.

We follow the guidance of Accounting Standards Codification ("ASC") Topic
205-40, Presentation of Financial Statements - Going Concern, in order to
determine whether there is substantial doubt about our ability to continue as a
going concern for one year after the date our financial statements are issued.
Given our current development plans and cash management efforts, we anticipate
that our cash resources will be sufficient to fund operations into the second
quarter of 2023. Our ability to continue operations after our current cash
resources are exhausted depends on our ability to obtain additional financing,
as to which no assurances can be given. Cash requirements may vary materially
from those now planned because of changes in our focus and direction of our
research and development programs, competitive and technical advances, patent
developments, regulatory changes or other developments. If adequate additional
funds are not available when required, management may need to curtail its
development efforts and planned operations to conserve cash.

Based on the current cash forecast, management has determined that our present
capital resources will not be sufficient to fund our planned operations for at
least one year from the issuance date of the financial statements, which raises
substantial doubt as to our ability to continue as a going concern. This
forecast of cash resources and planned operations is forward-looking information
that involves risks and uncertainties, and the actual amount of expenses could
vary materially and adversely as a result of a number of factors.


2021 Loan and Security Agreement



On August 6, 2021, we entered into a Loan and Security Agreement with Silicon
Valley Bank and affiliates of Silicon Valley Bank (collectively, "SVB") (the
"Loan and Security Agreement"). The Loan and Security Agreement provided for an
initial term loan of $25.0 million funded at the closing ("Term A Tranche"),
with an additional tranche of $25.0 million available if certain funding and
clinical milestones were met by August 31, 2022 ("Term B Tranche").

Effective December 28, 2021, we entered into a First Amendment (the "Amendment") to the Loan and Security Agreement (as so amended, the "Amended Loan and Security Agreement").



The Amended Loan and Security Agreement extends the interest-only period through
August 31, 2022, and provides for an automatic extension through August 31,
2023, if the Amended Milestones (as defined below) are met by August 31, 2022.
The Amendment eliminated the Term B Tranche, which remained unfunded, leaving
only the Term A Tranche (the "SVB Facility"). Under the Amended Loan and
Security Agreement, the SVB Facility will mature on August 1, 2023; however, if
we achieve the Amended Milestones on or prior to August 31, 2022, then the
maturity will automatically extend to August 1, 2024. As of March 31, 2022, the
SVB Facility was fully drawn in the amount of $25.0 million. The SVB Facility
bears interest at a floating rate per annum on the outstanding loans, payable
monthly, at the greater of (a) 7.75% and (b) the current published U.S. prime
rate, plus a margin of 4.5%. The Amended Loan and Security Agreement provides
for an interest-only period which extends through August 31, 2022, as compared
to March 31, 2022 in the Loan and Security Agreement, and may be automatically
extended through August 31, 2023, if, on or prior to August 31, 2022, SVB
receives evidence, satisfactory to it, confirming that we have (i) received at
least $50.0 million in net cash proceeds from the sale of our equity securities
after the date of the Amended Loan and Security Agreement, on terms and

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conditions acceptable to SVB, and (ii) achieved positive data in the first
cohort of the TCR-T Library Phase 1/2 Trial endorsed by an independent safety
monitoring committee as a safe dose to proceed (together, the "Amended
Milestones"). After the interest-only payment period, aggregate outstanding
borrowings are repayable in twelve consecutive, equal monthly installments of
principal plus accrued interest.

All outstanding principal and accrued and unpaid interest under the SVB Facility
and all other outstanding obligations under the Amended Loan and Security
Agreement are due and payable on August 1, 2023; however, if we achieve the
Amended Milestones on or prior to August 31, 2022, then the maturity will be
automatically extended to August 1, 2024. In addition to the payment of the
outstanding principal plus accrued interest due, we will also owe SVB 5.75% of
the original principal amounts borrowed as a final payment (the "Final
Payment"). We are permitted to make up to two prepayments, each payment of at
least $5.0 million, subject to the prepayment premium of the SVB Facility. Such
prepayment premium would be 3.00% of the principal amount of the SVB Facility if
prepaid prior to the first anniversary of the effective date, 2.00% of the
principal amount of the SVB Facility if prepaid on or after the first
anniversary of the effective date but prior to the second anniversary of the
effective date and 1.00% of the principal amount of the SVB Facility if prepaid
on or after the second anniversary of the effective date but prior to maturity
date. No amount that has been repaid may be reborrowed.

The Amended Loan and Security Agreement requires us to cash collateralize half
of the sum of the then-outstanding principal amount of the SVB Facility, plus an
amount equal to 5.75% of the original principal amount of the SVB Facility if we
do not achieve the Amended Milestones on or prior to August 31, 2022. In the
event a cash collateralization were to occur, so long as no event of default has
occurred, $2.5 million will be released from the collateral account following
the eighth scheduled payment of principal and interest, and a further $4.0
million will be released following the tenth scheduled payment of principal and
interest on the SVB facility, in each case, so long as (i) after subtracting
such scheduled payment, the sum of (a) the aggregate outstanding principal, (b)
accrued and unpaid interest and (c) the Final Payment is less than $9,770,933
and $5,604,167, respectively and (ii) the balance in the collateral account
after the release would equal or exceed $10.0 million and $6.0 million,
respectively. The SVB Facility and related obligations under the Amended Loan
and Security Agreement are secured by substantially all of our properties,
rights and assets, except for its intellectual property (which is subject to a
negative pledge under the Amended Loan and Security Agreement). In addition, the
Amended Loan and Security Agreement contains customary representations,
warranties, events of default and covenants.

In connection with our entry into the Loan and Security Agreement, we issued to
SVB warrants to purchase (i) up to 432,844 shares of our common stock, in the
aggregate, and (ii) up to an additional 432,842 shares of Common Stock, in the
aggregate, in the event we achieve certain clinical milestones, in each case at
an exercise price per share of $2.22. In connection with our entry into the
Amendment, we amended and restated the warrants issued to SVB. As amended and
restated, the warrants are for up to 649,615 shares of our common stock, in the
aggregate, at an exercise price per share of $1.16, or the SVB Warrants. The SVB
Warrants expire on August 6, 2031.

The issuance costs for the Loan and Security Agreement, including the Amended
Loan and Security Agreement, were approximately $1.2 million and primarily
related to the SVB Warrants, which will be amortized into interest expense over
the period to August 1, 2023. Interest expense was $0.7 million for the three
months ended March 31, 2022.

The fair value of the Amended Loan and Security Agreement as of March 31, 2022 approximates its face value due to proximity to the transaction.

Cash Flows

The following table summarizes our net decrease in cash and cash equivalents for the three months ended March 31, 2022 and 2021:



                                               Three Months Ended March 31,
                                                2022                 2021
($ in thousands)
Net cash provided by (used in):
Operating activities                        $      (7,770 )     $       (15,313 )
Investing activities                                  (29 )                (717 )
Financing activities                                    -                 1,017

Net decrease in cash and cash equivalents $ (7,799 ) $ (15,013 )

Cash flows from operating activities represent the cash receipts and disbursements related to all of our activities other than investing and financing activities. Operating activities is derived by adjusting our net loss for:

Non-cash operating items such as depreciation and stock-based compensation; and


Changes in operating assets and liabilities which reflect timing differences
between the receipt and payment of cash associated with transactions and when
they are recognized in results of operations.

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Net cash used in operating activities for the three months ended March 31, 2022
was $7.8 million, as compared to net cash used in operating activities of $15.3
million for the three months ended March 31, 2021. The net cash used in
operating activities for the three months ended March 31, 2022 was primarily due
to our net loss of $9.8 million, adjusted for $1.7 million of non-cash items
such as depreciation and stock-based compensation, and a decrease in accounts
payable of $0.8 million and a $0.2 million decrease in accrued expenses, offset
by a decrease in receivables of $1.1 million due to cash receipts and a decrease
to prepaid expenses and other assets of $0.2 million.

Net cash used in investing activities was $29 thousand for the three months
ended March 31, 2022, compared to $0.7 million for the three months ended March
31, 2021. The decrease of $0.7 million in net cash used in investing activities
was primarily a result of the decision to use available cash to expand our
internal cell therapy capabilities in our Houston, Texas facilities during the
first quarter of 2021.

There were no financing activities for the three months ended March 31, 2022.
Net cash provided by financing activities during the three months ended March
31, 2021 was $1.0 million, related primarily to proceeds from the exercise of
stock options.

Operating Capital and Capital Expenditure Requirements



We anticipate that losses will continue for the foreseeable future. As of March
31, 2022, our accumulated deficit was approximately $852.6 million. Our actual
cash requirements may vary materially from those planned because of a number of
factors, including:

changes in the focus, direction and pace of our development programs;

the effect of competing technologies and market developments;


the scope, progress, timing, costs and results of our TCR-T Library Phase 1/2
Trial for the treatment of certain solid tumors and costs associated with the
development of our product candidates;

our headcount growth focused on our TCR program and scaling our manufacturing capabilities;

our ability to secure partnering arrangements; and

costs of filing, prosecuting, defending and enforcing any patent claims and any other intellectual property rights, or other developments.



As of March 31, 2022, we had approximately $68.3 million of cash and cash
equivalents. Given our current development plans, we anticipate our cash
resources will be sufficient to fund our operations into the second quarter of
2023. In order to continue our operations beyond our forecasted runway we will
need to raise additional capital, and we have no committed sources of additional
capital at this time. The forecast of cash resources is forward-looking
information that involves risks and uncertainties, and the actual amount of our
expenses could vary materially and adversely as a result of a number of factors.
We have based our estimates on assumptions that may prove to be wrong, and our
expenses could prove to be significantly higher than we currently anticipate.
Management does not know whether additional financing will be on terms favorable
or acceptable to us when needed, if at all. If adequate additional funds are not
available when required, management may need to curtail its development efforts
and planned operations.

Working capital as of March 31, 2022 was $48.6 million, consisting of $69.8 million in current assets and $21.2 million in current liabilities. Working capital as of December 31, 2021 was $62.8 million, consisting of $78.8 million in current assets and $16.0 million in current liabilities.

Operating Leases



Our commitments for operating leases relate to laboratory and office space in
Houston, Texas and office space in Boston, Massachusetts. On December 21, 2015
and April 15, 2016, we renewed the sublease for our office space in Boston
through August 31, 2021. On April 22, 2021, we extended our lease for a portion
of office space currently held at our office in Boston. The renewal of the
portion of our office space was originally set to expire on August 31, 2021 but
was extended through August 31, 2026.

On March 12, 2019, we entered into a lease agreement for office space in Houston
at MD Anderson through April 2021. On October 15, 2019, we entered into another
lease agreement for additional office and laboratory space in Houston through
February 2027. On April 7, 2020, we entered into amendments to our existing
lease to lease additional office and laboratory space in Houston through
February 2027. In June and September 2020, we entered into short-term leases in
Houston for additional office and laboratory space. On December 15, 2020, we
entered into a second lease in Houston with MD Anderson which provided us
additional office and laboratory space through April 2028.

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Royalty and License Fees



On May 28, 2019, we entered into a patent license agreement, or the Patent
License, with the National Cancer Institute, or the NCI. The terms of the Patent
License require us to pay the NCI minimum annual royalties in the amount of $0.3
million, which will be reduced to $0.1 million once the aggregate minimum annual
royalties paid by us equals $1.5 million. For the three months ended March 31,
2022 and 2021, we recognized $0.3 million related to royalty payments under this
agreement. As of March 31, 2022, we have paid a total of $0.8 million in minimum
annual royalty payments under this agreement.

Pursuant to the Patent License, we are also required to make performance-based
payments contingent upon the successful completion of clinical and regulatory
benchmarks relating to the licensed products. Of such payments, the aggregate
potential benchmark payments are $4.3 million, of which aggregate payments of
$3.0 million are due only after marketing approval in the United States or in
Europe, Japan, Australia, China or India. The first benchmark payment of $0.1
million will be due upon the initiation of our first sponsored Phase 1 clinical
trial of a licensed product or licensed process in the field of use licensed
under the Patent License. In addition, we are required to pay the NCI one-time
benchmark payments following aggregate net sales of licensed products at certain
aggregate net sales ranging from $250.0 million to $1.0 billion. The aggregate
potential amount of these benchmark payments is $12.0 million. No payments were
made during the three months ended March 31, 2022 and March 31, 2021.

On October 5, 2018, we entered into an exclusive license agreement, or the
License Agreement, with PGEN Therapeutics, Inc., or PGEN, a wholly owned
subsidiary of Precigen Inc., or Precigen. Under the License Agreement, we are
obligated to pay PGEN an annual licensing fee of $0.1 million expected to be
paid through the term of the agreement and we have also agreed to reimburse
certain historical costs of PGEN up to $1.0 million. For the three months ended
March 31, 2022 and March 31, 2021, we have made licensing fee payments in
accordance with the terms of the agreement.

Pursuant to the terms of the License Agreement, we are responsible for
contingent milestone payments totaling up to an additional $52.5 million for
each exclusively licensed program upon the initiation of later stage clinical
trials and upon the approval of exclusively licensed products in various
jurisdictions. In addition, we will pay PGEN tiered royalties ranging from
low-single digit to high-single digit on the net sales derived from the sales of
any approved IL-12 products and CAR products. We will also pay PGEN royalties
ranging from low-single digit to mid-single digit on the net sales derived from
the sales of any approved TCR products, up to a maximum royalty amount of $100.0
million in the aggregate. We will also pay PGEN twenty percent of any
sublicensing income received by us relating to the licensed products. We are
responsible for all development costs associated with each of the licensed
products. PGEN will pay us royalties ranging from low-single digits to
mid-single digits on the net sales derived from the sale of PGEN's CAR products,
up to a maximum royalty amount of $100.0 million.

Critical Accounting Policies and Estimates



In our Annual Report on Form 10-K for the year ended December 31, 2021, our most
critical accounting policies and estimates upon which our financial status
depends were identified as those relating to clinical trial expenses and other
research and development expenses; collaboration agreements; fair value
measurements for stock-based compensation; and income taxes. We reviewed our
policies and determined that those policies remain our most critical accounting
policies for the three months ended March 31, 2022.

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