The following discussion and analysis of our financial condition and results of
operations should be read together with our consolidated financial statements
and related notes appearing elsewhere in this Annual Report on Form 10-K.

Some of the information contained in this discussion and analysis or set forth
elsewhere in this Annual Report on Form 10-K contains forward-looking statements
that involve substantial risks and uncertainties. The words "anticipate,"
"believe," "estimate," "expect," "intend," "may," "plan," "predict," "project,"
"would" and similar expressions are intended to identify forward-looking
statements, although not all forward-looking statements contain these
identifying words. There are a number of important risks and uncertainties that
could cause our actual results to differ materially from those indicated by
forward-looking statements. We may not actually achieve the plans, intentions or
expectations disclosed in our forward-looking statements, and you should not
place undue reliance on our forward-looking statements. Actual results or events
could differ materially from the plans, intentions and expectations disclosed in
the forward-looking statements we make. We have included important factors in
the cautionary statements included in this Annual Report on Form 10-K,
particularly in the section entitled "Risk Factors" in Part I, Item 1A that
could cause actual results or events to differ materially from the
forward-looking statements that we make. Our forward-looking statements do not
reflect the potential impact of any future acquisitions, mergers, dispositions,
joint ventures or investments that we may make.

You should read this Annual Report on Form 10-K and the documents that we have
filed as exhibits to this Annual Report on Form 10-K completely and with the
understanding that our actual future results may be materially different from
what we expect. The forward-looking statements contained in this Annual Report
on Form 10-K are made as of the date of this Annual Report on Form 10-K,and we
do not assume any obligation to update any forward-looking statements, whether
as a result of new information, future events or otherwise, except as required
by applicable law.

Overview

We are a leading, clinical stage genome editing company dedicated to developing
potentially transformative genomic medicines to treat a broad range of serious
diseases. We have developed a proprietary genome editing platform based on
CRISPR technology and we continue to expand its capabilities. Our product
development strategy is to target diseases of high unmet need where we aim to
make differentiated, transformational medicines using our gene editing platform.
We are advancing both in vivo CRISPR medicines, in which the medicine is
injected or infused into the patient to edit the cells inside their body, and
engineered cell medicines, in which cells are edited with our technology and
then administered to the patient. While our discovery efforts have ranged across
several diseases and therapeutic areas, the two areas where our programs are
more mature are ocular diseases and engineered cell medicines to treat
hemoglobinopathies and cancer.

In ocular diseases, our most advanced program is designed to address a specific
genetic form of retinal degeneration called Leber congenital amaurosis 10
("LCA10"), a disease for which we are not aware of any available therapies and
only one other potential treatment in clinical trials in the United States and
Europe. In mid-2019, we initiated a Phase 1/2 clinical trial for EDIT-101 (also
known as AGN-151587), an experimental medicine to treat LCA10, pursuant to an
investigational new drug application ("IND") that we filed in October 2018 and
which was accepted by the United States Food and Drug Administration ("FDA") in
November 2018. We and our partner Allergan Pharmaceuticals International Limited
(together with its affiliates, "Allergan") have begun patient screening and
expect to announce patient dosing by the end of the first quarter of 2020. We
plan to enroll approximately 18 patients in the United States and Europe.

In May 2015, we entered into a collaboration with Juno Therapeutics, Inc., a
wholly-owned subsidiary of Bristol-Myers Squibb Company ("Juno Therapeutics"), a
leader in the emerging field of immuno-oncology, to develop novel engineered
alpha-beta T cell therapies for cancer and autoimmune diseases, which was
amended and restated in each of May 2018 and November 2019, at which time we
also entered into a related license agreement with Juno Therapeutics, which we
collectively refer to as our collaboration with them. In March 2017, we entered
into a strategic alliance and option agreement with Allergan a leading global
pharmaceutical company, to discover, develop, and

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commercialize new gene editing medicines for a range of ocular disorders. In
July 2018, Allergan exercised its option to develop and commercialize EDIT-101
and paid us $15.0 million in connection with such exercise (the "EDIT-101 Option
Exercise Payment"). We and Allergan subsequently entered into a co-development
and commercialization agreement under which we will co-develop and equally split
profits and losses for EDIT-101 in the United States. In December 2018, we also
received a $25.0 million payment from Allergan in connection with the acceptance
of the IND for EDIT-101 (the "EDIT-101 Milestone Payment").

Since our inception in September 2013, our operations have focused on organizing
and staffing our company, business planning, raising capital, establishing our
intellectual property portfolio, assembling our core capabilities in genome
editing, seeking to identify potential product candidates, and undertaking
preclinical studies. Except for EDIT-101, all of our research programs are still
in the preclinical or research stage of development and the risk of failure of
all of our research programs is high. We have not generated any revenue from
product sales. We have funded our operations primarily through the initial
public offering of our common stock, follow-on public offerings of our common
stock including through at-the-market offerings, private placements of our
preferred stock, payments received under our collaboration with Juno
Therapeutics and payments received under our strategic alliance and
co-development and commercialization agreements with Allergan. From inception
through December 31, 2019, we raised an aggregate of $870.8 million to fund our
operations.

Since inception, we have incurred significant operating losses. Our net losses
were $133.7 million, $110.0 million and $120.3 million for the years ended
December 31, 2019, 2018 and 2017, respectively. As of December 31, 2019, we had
an accumulated deficit of $549.2 million. We expect to continue to incur
significant expenses and operating losses for the foreseeable future. Our net
losses may fluctuate significantly from quarter to quarter and from year to
year. We anticipate that our expenses will increase substantially as we continue
our current research programs and our preclinical development activities;
progress the clinical development of EDIT-101 with Allergan; seek to identify
additional research programs and additional product candidates; initiate
preclinical testing and clinical trials for other product candidates we identify
and develop; maintain, expand, and protect our intellectual property portfolio,
including reimbursing our licensors for such expenses related to the
intellectual property that we in-license from such licensors; further develop
our genome editing platform; hire additional clinical, quality control, and
scientific personnel; and incur additional costs associated with operating as a
public company. We do not expect to be profitable for the year ending
December 31, 2020 or the foreseeable future.

Financial Operations Overview

Revenue


To date, we have not generated any revenue from product sales and we do not
expect to generate any revenue from product sales for the foreseeable future. In
connection with entering into our collaboration with Juno Therapeutics in May
2015, we received an upfront payment of $25.0 million, and in each of May 2016
and July 2017, we received a milestone payment of $2.5 million. In May 2018, in
connection with the amendment and restatement of our collaboration agreement
with Juno Therapeutics to expand our collaboration to add an additional research
program, we received $5.0 million for amending the agreement and two $2.5
million milestone payments for technical progress in a research program. In
November 2019, we further amended and restated our collaboration with Juno
Therapeutics. Pursuant to the amended and restated collaboration, we received a
$70.0 million payment from Juno Therapeutics and will no longer receive research
support under such collaboration. Through December 31, 2019 and prior to
amending and restating our collaboration in November 2019, we had recognized an
aggregate of $23.9 million of research support from Juno Therapeutics since
entering into the collaboration. During the year ended December 31, 2019, we
recognized $6.2 million of research support from Juno Therapeutics. As of
December 31, 2019, we recorded $96.3 million of deferred revenue, all of which
is classified as long-term on our consolidated balance sheet, related to the
collaboration.

In connection with entering into our strategic alliance with Allergan in March
2017, we received an upfront payment of $90.0 million from Allergan (such
payment, the "Allergan Upfront"). In addition, we received $15.0 million related
to the EDIT-101 Option Exercise Payment in July 2018 and $25.0 million related
to the EDIT-101 Milestone Payment in December 2018. Through December 31, 2019,
we had recognized an aggregate of $44.4 million in revenue related to our
strategic alliance with Allergan, which includes all of the EDIT-101 Option

Exercise Payment and a

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portion of the EDIT-101 Milestone Payment. For the year ended December 31, 2019,
we recognized $13.6 million in revenue in connection with the Allergan Upfront,
which includes a portion of the EDIT-101 Milestone Payment. As of December 31,
2019, we recorded $85.6 million of deferred revenue, of which $63.8 million is
classified as long-term on the consolidated balance sheet. For additional
information about our revenue recognition policy related to the Juno
Therapeutics collaboration or the Allergan alliance, see "-Critical Accounting
Policies and Estimates-Revenue Recognition."

For the foreseeable future, we expect substantially all of our revenue will be
generated from our collaboration with Juno Therapeutics, our strategic alliance
with Allergan, any other collaborations or agreements we may enter into and
anticipated interest income.

Expenses

Research and Development Expenses



Research and development expenses consist primarily of costs incurred for our
research and development activities, including our drug discovery efforts and
preclinical studies under our research programs, which include:

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

compensation expense;

? costs of funding research performed by third parties that conduct research and

development and preclinical activities on our behalf;

? costs of purchasing lab supplies and non-capital equipment used in our

preclinical activities and in manufacturing preclinical study materials;

? consultant fees;

? facility costs including rent, depreciation, and maintenance expenses; and

fees for acquiring and maintaining licenses under our third-party licensing

? agreements, including any sublicensing or success payments made to our

licensors.




Research and development costs are expensed as incurred. At this time, we cannot
reasonably estimate or know the nature, timing, and estimated costs of the
efforts that will be necessary to complete the development of any product
candidates we may identify and develop. This is due to the numerous risks and
uncertainties associated with developing such product candidates, including the
uncertainty of:

? successful completion of preclinical studies, IND-enabling studies and natural

history studies;

? successful enrollment in, and completion of, clinical trials;

? receipt of marketing approvals from applicable regulatory authorities;

? establishing commercial manufacturing capabilities or making arrangements with

third-party manufacturers;

? obtaining and maintaining patent and trade secret protection and non-patent

exclusivity;

? launching commercial sales of a product, if and when approved, whether alone or

in collaboration with others;

? acceptance of a product, if and when approved, by patients, the medical

community, and third-party payors;




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? effectively competing with other therapies and treatment options;

? a continued acceptable safety profile following approval;

? enforcing and defending intellectual property and proprietary rights and

claims; and

? achieving desirable medicinal properties for the intended indications.




A change in the outcome of any of these variables with respect to the
development of any product candidates we develop would significantly change the
costs, timing, and viability associated with the development of that product
candidate. As a result of Allergan's exercise of its option to license EDIT-101
and our entry into a profit-sharing arrangement with Allergan in the United
States for EDIT-101, our obligations to fund such program in the United States
will represent 50% of the total costs related to developing and commercializing
the program in the United States.

We do not track research and development costs on a program-by-program basis except for reimbursable amounts that relate to third-party arrangements.



Research and development activities are central to our business model. We expect
research and development costs to increase significantly for the foreseeable
future as our development programs progress, including as we continue to
progress the clinical development of EDIT-101 with Allergan as well as
supporting preclinical studies for our other research programs.

General and Administrative Expenses


General and administrative expenses consist primarily of salaries and other
related costs, including stock-based compensation for personnel in executive,
finance, investor relations, business development, legal, corporate affairs,
information technology, facilities and human resource functions. Other
significant costs include corporate facility costs not otherwise included in
research and development expenses, legal fees related to intellectual property
and corporate matters, and fees for accounting and consulting services.

We anticipate that our general and administrative expenses will increase in the
future to support continued research and development activities and potential
commercialization of any product candidates we identify and develop. These
increases will include increased costs related to the hiring of additional
personnel and fees to outside consultants. We also anticipate increased expenses
related to reimbursement of third-party patent-related expenses and expenses
associated with operating as a public company, including costs for audit, legal,
regulatory, and tax-related services, director and officer insurance premiums,
and investor relations costs. With respect to reimbursement of third-party
intellectual property-related expenses specifically, given the ongoing nature of
the opposition and interference proceedings involving the patents licensed to us
under our license agreement with The Broad Institute, Inc. ("Broad") and the
President and Fellows of Harvard College ("Harvard"), we anticipate general and
administrative expenses will continue to be significant.

Other Income (Expense), Net

For the year ended December 31, 2019, other income (expense), net consisted primarily of interest income and accretion of discounts associated with marketable securities.


For the year ended December 31, 2018, other income (expense), net consisted
primarily of interest income, accretion of discounts associated with marketable
securities, and rental income from our former subtenant, partially offset by
interest expense on our construction financing lease obligation.

For the year ended December 31, 2017, other income (expense), net consisted primarily of interest expense on our construction financing lease obligation and promissory notes, and amortization of premiums associated with



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marketable securities, partially offset by rental income from our former subtenant, interest income, and accretion of discounts associated with marketable securities.

Critical Accounting Policies and Estimates



Our management's discussion and analysis of our financial condition and results
of operations is based on our consolidated financial statements, which have been
prepared in accordance with United States generally accepted accounting
principles. The preparation of our consolidated financial statements requires us
to make judgments and estimates that affect the reported amounts of assets,
liabilities, revenues, 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 to be reasonable under the circumstances. Actual results may differ
from these estimates under different assumptions or conditions. On an ongoing
basis, we evaluate our judgments and estimates in light of changes in
circumstances, facts, and experience. The effects of material revisions in
estimates, if any, will be reflected in the consolidated financial statements
prospectively from the date of change in estimates.

While our significant accounting policies are described in more detail in the
notes to our consolidated financial statements appearing elsewhere in this
Annual Report on Form 10-K, we believe the following accounting policy used in
the preparation of our consolidated financial statements requires the most
significant judgments and estimates.

Revenue Recognition



We recognize revenue in accordance with Financial Accounting Standards Board
("FASB") Accounting Standards Codification ("ASC"), Topic 606, Revenue
Recognition ("ASC 606"). Accordingly, we recognize revenue following the five
step model prescribed under Accounting Standards Updates No. 2014-09, Revenue
from Contracts with Customers: (i) identify contract(s) with a customer; (ii)
identify the performance obligations in the contract; (iii) determine the
transaction price; (iv) allocate the transaction price to the performance
obligations in the contract; and (v) recognize revenues when (or as) we satisfy
the performance obligation. We only apply the five-step model to contracts when
it is probable that we will collect the consideration we are entitled to in
exchange for the goods or services we transfer to the customer. At contract
inception, once the contract is determined to be within the scope of ASC 606, we
assess the goods or services promised within each contract and determine those
that are performance obligations, and whether each promised good or service is
distinct. We then recognize as revenue the amount of the transaction price that
is allocated to the respective performance obligation when (or as) the
performance obligation is satisfied. As part of the accounting for these
arrangements, we must develop assumptions that require judgment to determine the
standalone selling price for each performance obligation identified in the
contract. A significant portion of revenue recognized from our strategic
alliance with Allergan is related to research services performed for each
clinical development program whereby revenue is recognized as the underlying
services are performed using a proportional performance model. We measure
proportional performance based on full time employee hours incurred relative to
projected full time employee hours to complete the research services for each
clinical development program. We evaluate the measure of progress each reporting
period and, if necessary, adjust the measure of performance and related revenue
recognition.

Amounts received prior to satisfying the revenue recognition criteria are recorded as deferred revenue in our consolidated balance sheets.



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Results of Operations

Comparison of Years ended December 31, 2019 and 2018



The following table summarizes our results of operations for the years ended
December 31, 2019 and 2018, together with the changes in those items in dollars
(in thousands) and the respective percentages of change:




                                                 Year Ended
                                               December 31,
                                            2019           2018         Dollar Change      Percentage Change

Collaboration and other research and     $              $              $   

                              %
development revenues                          20,531         31,937           (11,406)              (36)
Operating expenses:
Research and development                      96,898         90,654              6,244                 7  %
General and administrative                    64,555         55,010              9,545                17  %
Total operating expenses                     161,453        145,664             15,789                11  %
Other income (expense), net
Other (expense) income, net                    (137)            328              (465)               n/m
Interest income, net                           7,313          3,445              3,868               n/m
Total other income, net                        7,176          3,773              3,403                90  %
Net loss                                 $ (133,746)    $ (109,954)    $      (23,792)              (22)  %




For our results of operations, we have included the respective percentage of
changes, unless greater than 100% or less than (100)%, in which case we have
denoted such changes as not meaningful (n/m).

Collaboration and Other Research and Development Revenues



Collaboration and other research and development revenues decreased by $11.4
million, to $20.5 million for the year ended December 31, 2019 from $31.9
million for the year ended December 31, 2018. This decrease was primarily
attributable to a $7.9 million decrease in revenue recognized pursuant to our
strategic alliance with Allergan, $3.9 million in revenue recognized during the
second quarter of 2018 related to a one time upfront payment in connection with
an out-license arrangement and a $0.2 million decrease in revenue recognized
pursuant to our collaboration with Juno Therapeutics.

Research and Development Expenses



Research and development expenses increased by $6.2 million, to $96.9 million
for the year ended December 31, 2019 from $90.7 million for the year ended
December 31, 2018. The following table summarizes our research and development
expenses for the years ended December 31, 2019 and December 31, 2018, together
with the changes in those items in dollars (in thousands) and the respective
percentages of change:




                                                    Year Ended
                                                  December 31,
                                                 2019        2018       Dollar Change      Percentage Change

Process and platform development expenses      $ 33,242    $ 25,466    $         7,776               31   %
Employee related expenses                        24,249      19,771              4,478               23   %
Stock-based compensation expenses                13,538      14,734            (1,196)              (8)   %
Licensing and sublicensing payment expenses      11,731       8,707        

     3,024               35   %
Facility expenses                                 9,131       6,058              3,073               51   %
Other expenses                                    5,007       3,418              1,589               46   %
Success payment expenses                              -      12,500           (12,500)              n/m

Total research and development expenses        $ 96,898    $ 90,654    $   

     6,244                7   %




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The increase in research and development expenses for the year ended December
31, 2019 compared to the year ended December 31, 2018 was primarily attributable
to:

approximately $7.8 million in increased process and platform development

? expenses due to increased research activity, mostly relating to external

research and development costs that we expect will increase further as we

continue to progress the clinical development of EDIT-101;

? approximately $4.5 million in increased employee related expenses due to an

increase in the size of our workforce;

? approximately $4.7 million in increased facility and other related expenses due

to increased office and professional service expenses; and

approximately $3.0 million in increased licensing and sublicensing payment

expenses, primarily due to sublicense expense recorded during the fourth

? quarter of 2019 in connection with receiving $70.0 million related to our

amended and restated collaboration agreement with Juno Therapeutics, partially

offset by sublicense fees owed to certain of our licensors in 2018 in

connection with receiving milestone and other payments from our licensees.

These increases were partially offset by the following decreases in research and development expenses:

approximately $12.5 million in decreased success payment expenses resulting

? from notes payable that were issued to Broad and settled during the second

quarter of 2018 in connection with us entering into a sponsored research

agreement with Broad; and

? approximately $1.2 million in decreased stock-based compensation expenses

mostly due to a decrease in non-employee stock option expense.

General and Administrative Expenses



General and administrative expenses increased by approximately $9.5 million, to
$64.6 million for the year ended December 31, 2019 from $55.0 million for the
year ended December 31, 2018. The following table summarizes our general and
administrative expenses for the years ended December 31, 2019 and December 31,
2018, together with the changes in those items in dollars (in thousands) and the
respective percentages of change:




                                                      Year Ended
                                                    December 31,
                                                   2019        2018       Dollar Change      Percentage Change

Intellectual property and patent related fees    $ 18,103    $ 20,442    $       (2,339)              (11)  %
Professional service expenses                      14,462       6,875              7,587               n/m
Stock-based compensation expenses                  13,705      11,864      

       1,841                16  %
Employee related expenses                          12,781      11,502              1,279                11  %
Other expenses                                      5,504       4,327              1,177                27  %

Total general and administrative expenses        $ 64,555    $ 55,010    $ 

       9,545                17  %




The increase in general and administrative expenses for the year ended December
31, 2019 compared to the year ended December 31, 2018 was primarily attributable
to:

? approximately $7.6 million in increased professional services expenses

primarily related to an increase in our use of consulting services;

? approximately $1.8 million in increased stock-based compensation expenses due

to an increase in employee stock option expense and employee headcount;




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? approximately $1.3 million in increased employee related expenses due to an

increase in the size of our workforce; and

? approximately $1.2 million in increased other expenses including

facility-related expenses.

These increases were partially offset by an approximate $2.3 million in decreased intellectual property and patent related fees, including expenses associated with the prosecution and maintenance of patents and patent applications.

Other Income, Net

For the year ended December 31, 2019, other income, net was $7.2 million, which was primarily attributable to interest income and accretion of discounts associated with marketable securities.



For the year ended December 31, 2018, other income, net was $3.8 million, which
was primarily attributable to interest income, accretion of discounts associated
with marketable securities, and rental income from our former subtenant,
partially offset by interest expense on our construction financing lease
obligation.

Comparison of Years Ended December 31, 2018 and 2017



The following table summarizes our results of operations for the years ended
December 31, 2018 and 2017, together with the changes in those items in dollars
(in thousands) and the respective percentage of changes:




                                                   Year Ended
                                                 December 31,
                                              2018           2017        Dollar Change      Percentage Change
Collaboration and other research and       $              $             $
development revenues                            31,937         13,728            18,209              n/m
Operating expenses:
Research and development                        90,654         83,159             7,495                9   %
General and administrative                      55,010         50,502             4,508                9   %
Total operating expenses                       145,664        133,661            12,003                9   %
Other income (expense), net:
Other income, net                                  328            587             (259)              n/m

Interest income (expense), net                   3,445          (978)             4,423              n/m
Total other income (expense), net                3,773          (391)      

      4,164              n/m
Net loss                                   $ (109,954)    $ (120,324)   $        10,370                9   %



Collaboration and Other Research and Development Revenues



Collaboration and other research and development revenues increased by $18.2
million, to $31.9 million for the year ended December 31, 2018 from $13.7
million for the year ended December 31, 2017. This increase was primarily
attributable to a $12.7 million increase in revenue recognized pursuant to our
strategic alliance with Allergan, $4.0 million in revenue recognized in
connection with entering into an out-license agreement and a $1.5 million
increase in revenue recognized pursuant to our collaboration with Juno
Therapeutics.

Research and Development Expenses

Research and development expenses increased by $7.5 million, to $90.7 million for the year ended December 31, 2018 from $83.2 million for the year ended December 31, 2017. The following table summarizes our research and



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development expenses for the years ended December 31, 2018 and December 31, 2017, together with the changes in those items in dollars (in thousands) and the respective percentages of change:






                                                    Year Ended
                                                  December 31,
                                                 2018        2017       Dollar Change      Percentage Change

Process and platform development expenses      $ 25,466    $ 17,117    $         8,349                49  %
Employee related expenses                        19,771      14,406              5,365                37  %
Stock-based compensation expenses                14,734      15,131              (397)               (3)  %
Success payment expenses                         12,500      14,500            (2,000)              (14)  %
Licensing and sublicensing payment expenses       8,707      14,610        

   (5,903)              (40)  %
Facility expenses                                 6,058       4,416              1,642                37  %
Other expenses                                    3,418       2,979                439                15  %

Total research and development expenses        $ 90,654    $ 83,159    $   

     7,495                 9  %




The increase in research and development expenses for the year ended December
31, 2018 compared to the year ended December 31, 2017 was primarily attributable
to:

approximately $8.3 million in increased process and platform development

expenses due to increased research activity, mostly relating to external

? research and development costs, which was partially offset by $1.7 million in

reimbursable research and development expenses associated with our

profit-sharing arrangement with Allergan related to EDIT-101;

? approximately $5.4 million in increased employee related expenses due to an

increase in the size of our workforce; and

? approximately $2.0 million in increased facility and other related expenses due

to increased professional service and office expenses.

These increases were partially offset by the following decreases in research and development expenses:

approximately $5.9 million in decreased licensing and sublicensing payment

expenses resulting primarily from $14.5 million in sublicense fees that were

owed to certain of our licensors in connection with receiving the Allergan

? Upfront and a milestone received under our collaboration with Juno Therapeutics

in 2017, partially offset by sublicense fees owed to certain of our licensors

in 2017 in connection with receiving milestone and other payments from our

licensees;

approximately $2.0 million in decreased success payment expenses resulting

primarily from $14.5 million in success payments due to the triggering of

? multiple success payment obligations under licensing agreements in 2017, offset

by the $12.5 million notes payable that were issued to Broad and settled during

the second quarter of 2018 in connection with us entering into a sponsored

research agreement with Broad; and

? approximately $0.4 million in decreased stock-based compensation expenses.

General and Administrative Expenses

General and administrative expenses increased by $4.5 million, to $55.0 million for the year ended December 31, 2018 from $50.5 million for the year ended December 31, 2017. The following table summarizes our general and



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administrative expenses for the years ended December 31, 2018 and December 31,
2017, together with the changes in those items in dollars (in thousands) and the
respective percentages of change:




                                                     Year Ended
                                                   December 31,
                                                  2018        2017      Dollar Change     Percentage Change

Intellectual property and patent related fees   $ 20,442    $ 23,921   $       (3,479)             (15)  %
Stock-based compensation expenses                 11,864       8,233             3,631               44  %
Employee related expenses                         11,502       8,915             2,587               29  %
Professional service expenses                      6,875       6,010               865               14  %
Other expenses                                     4,327       3,423               904               26  %
Total general and administrative expenses       $ 55,010    $ 50,502   $   

     4,508                9  %




The increase in general and administrative expenses for the year ended December
31, 2018 compared to the year ended December 31, 2017 was primarily attributable
to:

? approximately $3.6 million in increased stock-based compensation expenses due

to an increase in employee stock option expense;

? approximately $2.6 million in increased employee related expenses due to an

increase in the size of our workforce;

? approximately $0.9 million in increased other expenses including

facility-related expenses; and

? approximately $0.9 million in increased professional services expenses.

These increases were partially offset by an approximate $3.5 million in decreased intellectual property and patent related fees, including expenses associated with the prosecution and maintenance of patents and patent applications.

Other Income (Expense), Net



For the year ended December 31, 2018, other income, net was $3.8 million, which
was primarily attributable to interest income, accretion of discounts associated
with marketable securities, and rental income from our former subtenant,
partially offset by interest expense on our construction financing lease
obligation.

For the year ended December 31, 2017, other expense, net was $0.4 million, which
was primarily attributable to interest expense on our construction financing
lease obligation and certain promissory notes, and amortization of premiums
associated with marketable securities, partially offset by rental income from
our former subtenant, interest income and accretion of discounts associated with
marketable securities.

Liquidity and Capital Resources

Sources of Liquidity



From inception through December 31, 2019, we funded our operations primarily
through proceeds from private placements of our preferred stock of
$163.3 million, net proceeds of $444.8 million from public offerings of our
common stock, the Allergan Upfront and other milestones paid by Allergan, and
payments from Juno Therapeutics under our collaboration with them. As of
December 31, 2019, we had cash, cash equivalents and marketable securities of
$457.1 million.

In addition to our existing cash, cash equivalents and marketable securities we
are eligible to earn milestone and option exercise payments under our
collaboration agreement with Juno Therapeutics. Additionally, under our
strategic alliance with Allergan, we are eligible to earn milestone payments,
certain cost reimbursement for EDIT-101 costs in the

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United States and certain option exercise or extension payments. Our ability to
earn the milestone payments and the timing of earning these amounts are
dependent upon the timing and outcome of our development, regulatory and
commercial activities and, as such, are uncertain at this time. As of December
31, 2019, our right to contingent payments under our collaboration agreement
with Juno Therapeutics and our strategic alliance with Allergan are our only
significant committed potential external sources of funds.

2019 At-the-Market Offerings


In March 2018, we entered into a sales agreement with Cowen, under which we are
able from time to time to issue and sell shares of our common stock through
Cowen for aggregate gross sales proceeds of $150.0 million (the "March 2018 ATM
Program"). Through December 31, 2019, we sold an aggregate of 5,448,428 shares
of our common stock pursuant to the March 2018 ATM Program at a weighted-average
price of $27.53 per share for gross proceeds of $150.0 million. We paid Cowen a
3% cash commission on the gross sales price per share of our common stock sold
under the March 2018 ATM Program. No shares of common stock remain available for
sale under the sales agreement.

Cash Flows

The following table provides information regarding our cash flows for the years ended December 31, 2019, 2018 and 2017, respectively (in thousands):






                                                             Year Ended
                                                            December 31,
                                                  2019          2018          2017

Net cash (used in) provided by:
Operating activities                           $ (40,669)    $ (45,707)    $   (9,417)
Investing activities                               12,252      (53,087)      (183,810)
Financing activities                              131,824        86,940        154,534
Net increase (decrease) in cash and cash
equivalents                                    $  103,407    $ (11,854)    $  (38,693)

Net Cash (Used in) Operating Activities

Net cash used in operating activities was approximately $40.7 million for the year ended December 31, 2019. During the year ended December 31, 2019, we received $70.0 million related to our amended and restated collaboration agreement with Juno Therapeutics, which was partially recognized in revenue during the fourth quarter of 2019, partially offset by revenue recognized related to our strategic alliance with Allergan. This amount was offset by operating expenses that related to our on-going preclinical and clinical activities, sublicense expense, intellectual property costs and increased employee related expenses due to an increase in the size of our workforce.



Net cash used in operating activities was approximately $45.7 million for the
year ended December 31, 2018. During the year ended December 31, 2018, we
received $25.0 million related to the EDIT-101 Milestone Payment which was
partially recognized as revenue during the fourth quarter of 2018 and $15.0
million related to the EDIT-101 Option Exercise Payment which was fully
recognized as revenue during the third quarter of 2018, both related to our
strategic alliance with Allergan. We received $10.0 million related to our
amended and restated collaboration agreement with Juno Therapeutics which was
partially recognized during 2018. Additionally, we issued $12.5 million in notes
payable to Broad and settled in shares of common stock during the second quarter
of 2018 in connection with our entry into a sponsored research agreement with
Broad. This amount was offset by operating expenses that related to our on-going
preclinical activities, sublicensing and success payments, intellectual property
costs and increased employee related expenses due to an increase in the size of
our workforce.

Net cash used in operating activities was approximately $9.4 million for the
year ended December 31, 2017. During the year ended December 31, 2017, we
received a $90.0 million up-front payment associated with our strategic alliance
with Allergan. This was partially offset by revenue recognized associated with
our collaboration arrangement with Juno Therapeutics and our strategic alliance
with Allergan. Additionally, we issued $14.5 million in notes payable

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due to triggering success payments under licensing agreements. This amount was
offset by operating expenses that related to our on-going preclinical
activities, sublicensing payments, intellectual property costs and increased
employee related expenses due to an increase in the size of our workforce.

Net Cash (Used in) Provided by Investing Activities



Net cash provided by investing activities was approximately $12.3 million for
the year ended December 31, 2019, primarily related to proceeds from maturities
of marketable securities of $360.5 million, partially offset by costs to acquire
marketable securities of $342.2 million and costs to acquire property plant and
equipment of $6.2 million.

Net cash used in investing activities was approximately $53.1 million for the
year ended December 31, 2018, primarily related to costs to acquire marketable
securities of $459.4 million and costs to acquire property plant and equipment
of $4.8 million, partially offset by proceeds from maturities of marketable
securities of $411.0 million.

Net cash used in investing activities was approximately $183.8 million for the
year ended December 31, 2017, primarily related to costs to acquire marketable
securities of $375.3 million and costs to acquire property plant and equipment
of $2.1 million, partially offset by proceeds from maturities of marketable
securities of $193.5 million.

Net Cash Provided by Financing Activities


Net cash provided by financing activities was approximately $131.8 million for
the year ended December 31, 2019, primarily related to $116.3 million in
proceeds received from at-the-market offerings of our common stock, net of
issuance costs that were paid as of December 31, 2019, $14.9 million in proceeds
from exercises of options for our common stock and $0.6 million from issuances
of our common stock under equity benefit plans.

Net cash provided by financing activities was approximately $86.9 million for
the year ended December 31, 2018, primarily related to $76.8 million in proceeds
received from at-the-market offerings of our common stock, net of issuance costs
that were paid as of December 31, 2018, $10.3 million in proceeds from exercises
of options for our common stock and $0.7 million from issuances of our common
stock under equity benefit plans, partially offset by payments on our
construction financing lease obligation of $0.9 million.

Net cash provided by financing activities was approximately $154.5 million for
the year ended December 31, 2017, primarily related to $154.1 million in
proceeds received from public offerings of common stock, net of issuance costs
that were paid as of December 31, 2017, and $1.8 million in proceeds from
exercises of options for our common stock, partially offset by payments on our
construction financing lease obligation of $0.8 million and promissory notes of
$0.6 million.

Funding Requirements

We expect our expenses to increase in connection with our ongoing activities,
particularly as we further advance our current research programs and our
preclinical development activities; progress the clinical development of
EDIT-101 with Allergan; seek to identify product candidates and additional
research programs; initiate preclinical testing and clinical trials for other
product candidates we identify and develop; maintain, expand, and protect our
intellectual property portfolio, including reimbursing our licensors for
expenses related to the intellectual property that we in-license from such
licensors; hire additional clinical, quality control, and scientific personnel;
and incur costs associated with operating as a public company. In addition, if
we obtain marketing approval for any product candidate that we identify and
develop, we expect to incur significant commercialization expenses related to
product sales, marketing, manufacturing, and distribution to the extent that
such sales, marketing, and distribution are not the responsibility of a
collaborator. We do not expect to generate significant recurring revenue unless
and until we obtain regulatory approval for and commercialize a product
candidate. Furthermore, since 2016 we have incurred, and in future years we
expect to continue to incur, significant costs associated with operating as a
public company. Accordingly, we will need to obtain substantial additional
funding in connection with our continuing operations. If we are unable to raise
capital when needed or on attractive terms, we would be forced to delay, reduce,
or eliminate our research and development programs or future commercialization
efforts.

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We expect that our existing cash, cash equivalents and marketable securities at
December 31, 2019 and anticipated interest income will enable us to fund our
operating expenses and capital expenditure requirements for at least 24 months
following the date of this Annual Report on Form 10-K. We have based our
estimates on assumptions that may prove to be wrong, and we may use our
available capital resources sooner than we currently expect. Our future capital
requirements will depend on many factors, including:

the scope, progress, results, and costs of drug discovery, preclinical

? development, laboratory testing, and clinical or natural history study trials

for the product candidates we develop;

? the costs of progressing the clinical development with Allergan of EDIT-101 to

treat LCA10;

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

? maintaining and enforcing our intellectual property and proprietary rights, and

defending intellectual property-related claims;

? the costs, timing, and outcome of regulatory review of the product candidates

we develop;

the costs of future activities, including product sales, medical affairs,

? marketing, manufacturing, and distribution, for any product candidates for

which we receive regulatory approval;

? the success of our collaboration with Juno Therapeutics and our strategic

alliance with Allergan;

whether Juno Therapeutics exercises any of its options to extend the research

? program term and/or to certain of the research programs under our

collaboration;

? whether Allergan exercises any additional options under our strategic alliance;

? our ability to establish and maintain additional collaborations on favorable

terms, if at all;

? the extent to which we acquire or in-license other medicines and technologies;

? the costs of reimbursing our licensors for the prosecution and maintenance of

the patent rights in-licensed by us; and

? the costs of operating as a public company.


Identifying potential product candidates and conducting preclinical studies and
clinical trials is a time-consuming, expensive, and uncertain process that takes
many years to complete, and we may never generate the necessary data or results
required to obtain marketing approval and achieve product sales. In addition,
any product candidate that we identify and develop, if approved, may not achieve
commercial success. Our commercial revenues, if any, will be derived from sales
of genomic medicines that we do not expect to be commercially available for many
years, if at all. Accordingly, we will need to continue to rely on additional
financing to achieve our business objectives. Adequate additional financing may
not be available to us on acceptable terms, or at all.

Until such time, if ever, as we can generate substantial product revenues, we
expect to finance our cash needs through a combination of equity offerings, debt
financings, collaborations, strategic alliances, and licensing arrangements. To
the extent that we raise additional capital through the sale of equity or
convertible debt securities, our stockholders' ownership interests will be
diluted, and the terms of these securities may include liquidation or other
preferences that adversely affect the rights of our stockholders. Debt
financing, if available, may involve agreements that include covenants limiting
or restricting our ability to take specific actions, such as incurring
additional debt, making capital expenditures, or declaring dividends.

If we raise funds through additional collaborations, strategic alliances, or
licensing arrangements with third parties, we may have to relinquish valuable
rights to our technologies, future revenue streams, research programs, or

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product candidates or to grant licenses on terms that may not be favorable to
us. If we are unable to raise additional funds through equity or debt financings
when needed, we may be required to delay, limit, reduce, or terminate our
product development or future commercialization efforts or grant rights to
develop and market product candidates that we would otherwise prefer to develop
and market ourselves.

Contractual Obligations

The following table summarizes our significant contractual obligations as of payment due date by period at December 31, 2019 (in thousands):






                                                        Less Than                                          More than
                                            Total        1 Year        1 to 3 Years      3 to 5 Years       5 Years
Operating lease obligations (1)            $ 35,092    $     8,150    $    

15,889 $ 10,763 $ 290

Represents future minimum lease payments under our non-cancelable operating (1) leases. The minimum lease payments above exclude our share of the facility

operating expenses and other costs that are reimbursable to the landlord

under the leases.




The table above does not include potential milestone and success fees,
sublicense fees, royalty fees, licensing maintenance fees, and reimbursement of
patent maintenance costs that we may be required to pay under agreements we have
entered into with certain institutions to license intellectual property. Our
agreements to license intellectual property include potential milestone payments
that are dependent upon the development of products using the intellectual
property licensed under the agreements and contingent upon the achievement of
development or regulatory approval milestones, as well as commercial milestones.
We have not included such potential obligations in the table above because they
are contingent upon the occurrence of future events and the timing and
likelihood of such potential obligations are not known with certainty. For
further information regarding these agreements, please see "Business-Our
Collaborations and Licensing Strategy."

We enter into contracts in the normal course of business with contract research
organizations and other vendors to assist in the performance of our research and
development activities and other services and products for operating purposes.
These contracts generally provide for termination on notice, and therefore are
cancelable contracts and not included in the table of contractual obligations
and commitments.

Off-Balance Sheet Arrangements

We did not have, during the periods presented, and we do not currently have, any off-balance sheet arrangements, as defined under applicable Securities and Exchange Commission rules.

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