The following discussion and analysis of our financial condition and results of
operations should be read together with our condensed consolidated financial
statements and related notes appearing elsewhere in this Quarterly Report on
Form 10-Q and our Annual Report on Form 10-K for the year ended December 31,
2019, which was filed with the Securities and Exchange Commission ("SEC") on
February 26, 2020 (the "Annual Report").



This Quarterly Report on Form 10-Q 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. All
statements addressing our future operating performance and clinical development
and regulatory timelines that we expect or anticipate will occur in the future,
are forward-looking statements. 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
Quarterly Report on Form 10-Q, particularly in the section entitled "Risk
Factors" in Part II, 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 Quarterly Report on Form 10-Q and the documents that we
have filed as exhibits to this Quarterly Report on Form 10-Q 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 Quarterly
Report on Form 10-Q are made as of the date of this Quarterly Report
on Form 10-Q, 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, an
experimental medicine to treat LCA10. The first patient was dosed in the first
quarter of 2020 and we plan to enroll approximately 18 patients in the United
States and Europe in up to five cohorts. We have completed dosing of the adult
low-dose cohort. This trial remains active and open for enrollment. We continue
to enroll patients, but enrollment has been slowed due to the ongoing impact of
the coronavirus disease of 2019 ("COVID-19") pandemic. For our engineered cell
medicines, our lead program is EDIT-301, an experimental medicine to treat
sickle cell disease and beta-thalassemia. We have initiated IND-enabling studies
for EDIT-301 and aim to submit to the U.S. Food and Drug Administration an
investigational new drug application ("IND") for EDIT-301 for the treatment of
sickle cell disease by the end of 2020. In addition, EDIT-201 is our
experimental allogeneic healthy-donor NK cell medicine for the treatment of

solid tumors.

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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 Pharmaceuticals International Limited (which is referred to together
with its affiliates as "Allergan"), a leading global pharmaceutical company, to
discover, develop, and 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 we subsequently entered into a co-development and
commercialization agreement with Allergan under which we will co-develop and
equally split profits and losses for EDIT-101 in the United States. Allergan was
acquired by AbbVie, Inc. in May 2020. On August 5, 2020, we entered into a
termination agreement with Allergan pursuant to which, among other things, we
and Allergan terminated the strategic alliance and option agreement and the
co-development and commercialization agreement.



As a result of the termination of our collaboration with Allergan, we regained
full global rights to research, develop, manufacture, and commercialize our
ocular product candidates, including EDIT-101 for the treatment of LCA10. Under
the termination agreement, Allergan granted us a non-exclusive, royalty-bearing
right and license, including the right to grant sublicenses (through multiple
tiers), to certain Allergan know-how that is necessary to develop, manufacture
and commercialize EDIT-101. In addition, we are obligated to use commercially
reasonable efforts to develop and commercialize a product directed to each of
four collaboration targets, one of which is LCA10. Under the termination
agreement, we agreed to make a one-time aggregate payment of $20.0 million to
Allergan, of which $17.5 million had been paid as of September 30, 2020. In
addition, we will make certain payments on achievements of clinical and
regulatory milestones up to $20.0 million for each target program and aggregated
sales milestones for all products covered by the termination agreement up to
$90.0 million. We are also obligated to pay royalties in a low-single digit
percentage, subject to reduction under specified circumstances, on net sales of
specified products. Our obligation to pay royalties will expire on a
country-by-country and product-by-product basis upon the later of the expiration
of regulatory-based exclusivity with respect to such product in such country and
the tenth anniversary of the first commercial sale of such product. We and
Allergan also entered into a transition services agreement to facilitate the
transfer of the LCA10 program from Allergan to us. As a result of the
termination of the agreements with Allergan, we now have full responsibility for
the Phase 1/2 clinical trial for EDIT-101 and expect that our research and
development expenses will increase significantly for the foreseeable future as
our development programs progress.



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 and clinical 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 primarily financed our operations
through various equity financings and payments received under our research
collaboration with Juno Therapeutics and our strategic alliance with Allergan.



Since inception, we have incurred significant operating losses. Our net losses
were $53.5 million and $96.0 million for the nine months ended September 30,
2020 and 2019, respectively. As of September 30, 2020, we had an accumulated
deficit of $602.7 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, including those related to
EDIT-301 and EDIT-201; progress the clinical development of EDIT-101; 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.

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Although we did not experience any significant impact on our financial
condition, results of operations or liquidity due to the ongoing COVID-19
pandemic during the nine months ended September 30, 2020, we have recently
experienced slowed enrollment in the EDIT-101 clinical trial as a result of the
COVID-19 pandemic. The ultimate impact of the COVID-19 pandemic, particularly in
light of its current resurgence, is highly uncertain and we do not yet know the
full extent of potential delays or impacts on our business, our ability to
continue to raise additional capital, the EDIT-101 clinical trial, ongoing
preclinical activities, including those related to EDIT-301 and EDIT-201, or the
global economy as a whole. In March, we implemented a work from home policy, and
restricted on-site activities at our facilities in Massachusetts and Colorado to
certain manufacturing, laboratory and related support activities in light of the
COVID-19 pandemic. Under our return to onsite work plans, we have resumed
manufacturing, laboratory and related support activities at our facilities in
Massachusetts and Colorado using shifts and other capacity-limiting measures to
comply with social distancing guidelines. As such, it is uncertain as to the
full magnitude that the pandemic will have directly or indirectly on our
financial condition, liquidity and future results of operations.



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 our collaboration with Juno Therapeutics, we have received an
aggregate of $120.0 million in payments, which have primarily consisted of the
initial upfront and amendment payments, development milestone payments and
research funding support. We no longer receive research funding support. As of
September 30, 2020, we recorded $96.3 million of deferred revenue, of which
$79.3 million is classified as long-term on our condensed consolidated balance
sheet. There was no revenue recognized under the collaboration with Juno
Therapeutics during the nine months ended September 30, 2020. Under this
collaboration, we will recognize revenue upon delivery of option packages to
Juno Therapeutics. We expect that our revenue will fluctuate from
quarter-to-quarter and year-to-year as a result of the timing of when we deliver
such option packages.

In connection with our strategic alliance with Allergan, we received an
aggregate of $130.0 million in payments, which consisted of the initial upfront
payment, an option exercise payment and a milestone payment. Prior to the
termination of our agreements with Allergan, certain of these payments were
deferred and were being recognized over the remaining contract term using the
proportional performance method. During the third quarter of 2020, as a result
of the termination of our agreements with Allergan, we recognized $63.2 million
of previously deferred revenue related to Allergan.

For additional information about our revenue recognition policy related to the
Juno Therapeutics collaboration or the Allergan strategic alliance, see
"-Critical Accounting Policies and Estimates-Revenue Recognition" included in
our Annual Report.

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

Expenses

Research and Development Expenses

Research and development expenses consist primarily of costs incurred for our research and development activities, which include:

? drug discovery efforts and preclinical and clinical studies under our research

programs;

? 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




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and clinical 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 clinical, 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;

? 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.




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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 the termination of our profit-sharing arrangement with
Allergan in the United States for EDIT-101, we are now obligated to fund all of
the costs related to developing and commercializing the LCA10 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 as well as supporting preclinical
studies for our other research programs, including EDIT-301.



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, interference and re-examination proceedings involving the
patents licensed to us under our license agreements 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 (Expense) Income, Net


For the nine months ended September 30, 2020, other (expense) income, net consisted primarily of changes in the fair value of equity securities, interest income and accretion of discounts associated with other marketable securities.





For the nine months ended September 30, 2019, other (expense) income, net
consisted primarily of interest income and accretion of discounts associated
with marketable securities, partially offset by loss on disposal of property and
equipment.


Critical Accounting Policies and Estimates





Our management's discussion and analysis of our financial condition and results
of operations is based on our condensed consolidated financial statements, which
have been prepared in accordance with United States generally accepted
accounting principles. The preparation of our condensed 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 condensed 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
condensed consolidated financial statements prospectively from the date of

change in estimates.

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There have been no material changes to our critical accounting policies from
those described in "Management's Discussion and Analysis of Financial Condition
and Results of Operations" in our Annual Report.



Results of Operations


Comparison of the Three Months ended September 30, 2020 and 2019





The following table summarizes our results of operations for the three months
ended September 30, 2020 and 2019, together with the changes in those items in
dollars (in thousands) and the respective percentages of change:




                                              Three Months Ended
                                                September 30,
                                              2020          2019        Dollar Change      Percentage Change
Collaboration and other research and
development revenues                        $  62,841    $    3,848    $        58,993               n/m  %
Operating expenses:
Research and development                       33,916        22,702             11,214                49  %
General and administrative                     19,936        15,734              4,202                27  %
Total operating expenses                       53,852        38,436             15,416                40  %
Other (expense) income, net:
Other expense, net                            (1,396)          (33)            (1,363)               n/m  %
Interest income, net                              226         1,680            (1,454)              (87)  %
Total other (expense) income, net             (1,170)         1,647        

   (2,817)               n/m  %
Net income (loss)                           $   7,819    $ (32,941)    $        40,760               n/m  %




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 increased by $59.0
million, to $62.8 million for the three months ended September 30, 2020 from
$3.8 million for three months ended September 30, 2019. This increase was
primarily attributable to the recognition of $59.9 million of previously
deferred revenue as a result of the termination of our strategic alliance with
Allergan.


Research and development expenses





Research and development expenses increased by $11.2 million, to $33.9 million
for the three months ended September 30, 2020 from $22.7 million for the three
months ended September 30, 2019. The following table summarizes our research and
development expenses for the three months ended September 30, 2020 and 2019,
together with the changes in those items in dollars (in thousands) and the
respective percentages of change:






                                               Three Months Ended
                                                 September 30,
                                                2020         2019       Dollar Change     Percentage Change

Process and platform development expenses    $   18,204    $  9,334    $   

     8,870               95  %
Employee related expenses                         8,072       6,357              1,715               27  %
Facility expenses                                 3,617       2,468              1,149               47  %

Stock-based compensation expenses                 2,938       3,619        

     (681)             (19)  %
Other expenses                                      893         721                172               24  %
Sublicense and license fees                         192         203               (11)                -  %

Total research and development expenses      $   33,916    $ 22,702    $   

    11,214               49  %




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The increase in research and development expenses for the three months ended
September 30, 2020 compared to the three months ended September 30, 2019 was
primarily attributable to:



approximately $8.9 million in increased process and platform development

expenses related primarily to the clinical and manufacturing development of

? EDIT-101 and our other programs, including a one-time in-process research and

development expense of $5.0 million for re-acquiring the rights to EDIT-101


   from Allergan;



approximately $1.7 million in increased employee related expenses primarily due

? to an increase in the size of our workforce including the expansion of our

research and development organization;


 ? approximately $1.1 million in increased facility related expenses; and

? approximately $0.2 million in increased other expenses.

These increases were partially offset by approximately $0.7 million in decreased stock-based compensation expenses resulting from forfeitures.





As a result of the termination of our agreements with Allergan, we expect that
our research and development costs will increase as we are now obligated to fund
all of the costs related to developing and commercializing the LCA10 program in
the United States. In addition, we anticipate that we will increase headcount in
our clinical and development organization as a result of the transfer from
Allergan to us of the Phase 1/2 clinical trial of EDIT-101 for the treatment of
LCA10 as part of the termination of the arrangement with Allergan.



General and administrative expenses





General and administrative expenses increased by $4.2 million, to $19.9 million
for the three months ended September 30, 2020 from $15.7 million for the three
months ended September 30, 2019.The following table summarizes our general and
administrative expenses for the three months ended September 30, 2020 and 2019,
together with the changes in those items in dollars (in thousands) and the
respective percentages of change:




                                                   Three Months Ended
                                                     September 30,
                                                    2020         2019       Dollar Change     Percentage Change

Professional service expenses                    $    6,314    $  3,980    $         2,334              59   %
Intellectual property and patent related fees         4,446       4,227                219               5   %
Employee related expenses                             4,164       3,311                853              26   %
Stock-based compensation expenses                     2,908       2,940               (32)             (1)   %
Facility and other expenses                           2,104       1,276                828              65   %

Total general and administrative expenses $ 19,936 $ 15,734 $ 4,202

              27   %




The increase in general and administrative expenses for the three months ended
September 30, 2020 compared to the three months ended September 30, 2019 was
primarily attributable to:



? approximately $2.3 million in increased professional service expenses in

connection with the termination of the Allergan agreement;

approximately $0.9 million in increased employee related expenses primarily due

? to an increase in the size of our workforce and the timing of hiring key


   executives;



? approximately $0.8 million in increased facility and other expenses resulting

from additional office space leased in 2020; and






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? approximately $0.2 million in increased intellectual property and patent


   related fees.




Other (expense) income, net



For the three months ended September 30, 2020, other (expense) income, net was
an expense of $1.2 million, which was primarily attributable to the unrealized
losses related to corporate equity securities, partially offset by interest
income.



For the three months ended September 30, 2019, other (expense) income, net was
income of $1.6 million, which was primarily attributable to interest income and
accretion of discounts associated with marketable securities.



Comparison of the Nine Months ended September 30, 2020 and 2019





The following table summarizes our results of operations for the nine months
ended September 30, 2020 and 2019, together with the changes in those items in
dollars (in thousands) and the respective percentages of change:




                                              Nine Months Ended
                                                September 30,
                                              2020          2019        Dollar Change      Percentage Change
Collaboration and other research and
development revenues                       $   79,313    $    8,247    $        71,066               n/m  %
Operating expenses:
Research and development                       96,492        62,109             34,383                55  %
General and administrative                     51,789        47,638              4,151                 9  %
Total operating expenses                      148,281       109,747             38,534                35  %
Other income, net
Other income (expense), net                    13,114         (144)             13,258               n/m  %
Interest income, net                            2,377         5,668            (3,291)              (58)  %
Total other income, net                        15,491         5,524              9,967               n/m  %
Net loss                                   $ (53,477)    $ (95,976)    $        42,499              (44)  %




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 increased by $71.1
million to $79.3 million for the nine months ended September 30, 2020 from $8.2
million for the nine months ended September 30, 2019. This increase was
primarily attributable to the recognition of $63.0 million of previously
deferred revenue as a result of the termination of our strategic alliance with
Allergan, as well as an increase of $7.7 million in revenue recognized pursuant
to an out-license agreement we entered into during the second quarter of 2020,
and a $0.4 million increase in revenue recognized pursuant to other license and
collaboration arrangements during the nine months ended September 30, 2020.




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Research and development expenses





Research and development expenses increased by $34.4 million, to $96.5 million
for the nine months ended September 30, 2020 from $62.1 million for the nine
months ended September 30, 2019. The following table summarizes our research and
development expenses for the nine months ended September 30, 2020 and 2019,
together with the changes in those items in dollars (in thousands) and the
respective percentages of change:




                                              Nine Months Ended
                                               September 30,
                                              2020         2019       Dollar Change     Percentage Change

Process and platform development expenses   $  46,162    $ 24,351    $     

  21,811               90  %
Employee related expenses                      24,589      17,054              7,535               44  %
Facility expenses                               9,909       6,338              3,571               56  %

Stock-based compensation expenses               8,668      10,854          

 (2,186)             (20)  %
Sublicense and license fees                     4,132       1,036              3,096              n/m  %
Other expenses                                  3,032       2,476                556              n/m  %

Total research and development expenses     $  96,492    $ 62,109    $     

  34,383               55  %



The increase in research and development expenses for the nine months ended September 30, 2020 compared to the nine months ended September 30, 2019 was primarily attributable to:

approximately $21.8 million in increased process and platform development

expenses related primarily to the clinical and manufacturing development of

EDIT-101 and our other programs, including a one-time in-process research and

? development expense of $5.0 million for re-acquiring the rights to EDIT-101

from Allergan and expenses incurred under the profit-sharing arrangement with

Allergan related to EDIT-101 prior to the termination of the agreement and

expenses incurred related to an in-license arrangement entered into during the


   first quarter of 2020;



approximately $7.5 million in increased employee related expenses primarily due

? to an increase in the size of our workforce including the expansion of our

development organization;

? approximately $3.6 million in increased facility expenses primarily due

additional lab and manufacturing space leased in 2020;

approximately $3.1 million in increased sublicense and license fees primarily

? related to sublicense fees that were owed to our licensors in connection with

an out-license agreement that we entered into during the second quarter of 2020

and additional license fees that we incurred during the quarter; and

? approximately $0.6 million in increased other expenses primarily due to

increase software license fees.

These increases were partially offset by approximately $2.2 million in decreased stock-based compensation expenses resulting primarily from forfeitures.





As a result of the termination of our agreements with Allergan, we expect that
our research and development costs will increase as we are now obligated to fund
all of the costs related to developing and commercializing the LCA10 program in
the United States. In addition, we anticipate that we will increase headcount in
our clinical and development organization as a result of the transfer from
Allergan to us of the Phase 1/2 clinical trial of EDIT 101 for the treatment of
LCA10 as part of the termination of the agreement with Allergan.



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General and administrative expenses





General and administrative expenses increased by $4.2 million, to $51.8 million
for the nine months ended September 30, 2020 from $47.6 million for the nine
months ended September 30, 2019. The following table summarizes our general and
administrative expenses for the nine months ended September 30, 2020 and 2019,
together with the changes in those items in dollars (in thousands) and the
respective percentages of change:




                                                  Nine Months Ended
                                                   September 30,
                                                  2020         2019       Dollar Change     Percentage Change

Intellectual property and patent related fees   $  13,457    $ 13,570    $ 

       (113)              (1)  %
Employee related expenses                          12,616       9,571              3,045               32  %
Professional service expenses                      10,803      10,809                (6)              (0)  %

Stock-based compensation expenses                   8,815      10,053            (1,238)             (12)  %
Facility and other expenses                         6,098       3,635              2,463               68  %
Total general and administrative expenses       $  51,789    $ 47,638    $ 

       4,151                9  %



The increase in general and administrative expenses for the nine months ended September 30, 2020 compared to the nine months ended September 30, 2019 was primarily attributable to:

approximately $3.0 million in increased employee related expenses primarily due

? to an increase in the size of our workforce and the timing of hiring key


   executives; and



? approximately $2.5 million in increased facility and other expenses resulting


   from additional office space leased in 2020.




These increases were partially offset by approximately $1.2 million in decreased
stock-based compensation expenses resulting from a modification that occurred in
2019 with respect to which there was no similar activity for in 2020 and
approximately $0.1 million in decreased intellectual property and patent related
expenses.



Other (expense) income, net



For the nine months ended September 30, 2020, other (expense) income, net was
income of $15.5 million, which was primarily attributable to the unrealized
gains related to corporate equity securities, interest income and accretion of
discounts associated with marketable securities.



For the nine months ended September 30, 2019, other (expense) income, net was
income of $5.5 million, which was primarily attributable to interest income and
accretion of discounts associated with marketable securities, partially offset
by a loss on disposal of property and equipment.



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Liquidity and Capital Resources





Sources of Liquidity



In May 2020, we entered into a sales agreement with Cowen and Company, LLC
("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 up to
$150.0 million (the "ATM Facility"). We have not sold any shares of our common
stock under this ATM Facility as of the date of this Quarterly Report on Form
10-Q. In June 2020, we completed a public offering whereby we sold 6,900,000
shares of our common stock, inclusive of 900,000 shares of common stock sold by
us pursuant to the full exercise of an option granted to the underwriters in
connection with the offering and received net process of approximately $203.7
million. As of September 30, 2020, we have raised an aggregate of $648.7 million
in net proceeds through the sale of shares of our common stock in public
offerings and at-the-market offerings. We also have funded our business from
payments received under our research collaboration with Juno Therapeutics and
our strategic alliance with Allergan, which was terminated in August 2020. As of
September 30, 2020, we had cash, cash equivalents and marketable securities

of
$541.3 million.



In addition to our existing cash, cash equivalents and marketable securities we
are eligible to earn milestone and other payments under our collaboration
agreement with Juno Therapeutics. 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 September 30, 2020, our right to contingent
payments under our collaboration agreement with Juno Therapeutics is our only
significant committed potential external source of funds.

Cash Flows

The following table provides information regarding our cash flows for the nine months ended September 30, 2020 and 2019 (in thousands):






                                                               Nine Months Ended
                                                                 September 30,
                                                               2020          2019
Net cash (used in) provided by:
Operating activities                                        $ (139,742)   $ (81,693)
Investing activities                                           (31,628)        4,434
Financing activities                                            215,022       47,255
Net increase (decrease) in cash, cash equivalents, and
restricted cash                                             $    43,652   $ (30,004)

Net Cash Used in Operating Activities

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


Net cash used in operating activities was approximately $139.7 million for the
nine months ended September 30, 2020, which primarily consisted of operating
expenses that relate to our on-going preclinical and clinical activities, patent
costs and license fees, and increased costs as a result of staffing needs due to
our expanding operations. These expenses were partially offset by cash inflows
from license fees received in the period.



Net cash used in operating activities was approximately $81.7 million for the
nine months ended September 30, 2019, which primarily consisted of operating
expenses that related to our strategic alliance with Allergan which decreased
deferred revenue, partially offset by an upfront payment received related to an
out-license arrangement. This amount was offset by operating expenses that
related to our on-going preclinical and clinical activities, patent costs and
license fees, costs related to obtaining additional research facilities and
increased costs as a result of staffing needs due to our expanding operations.

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Net Cash Used in Investing Activities





Net cash used in investing activities was approximately $31.6 million for the
nine months ended September 30, 2020, primarily related to costs used to acquire
marketable securities of $300.4 million and costs to acquire property and
equipment of $5.8 million, partially offset by proceeds from maturities of
marketable securities of $274.5 million.



Net cash provided by investing activities was approximately $4.4 million for the
nine months ended September 30, 2019, primarily related to higher proceeds from
maturities of marketable securities than purchases of marketable securities that
were partially offset by $4.5 million in equipment purchases.



Net Cash Provided by Financing Activities


Net cash provided by financing activities was approximately $215.0 million for
the nine months ended September 30, 2020, and consisted of $203.8 million in net
proceeds received from offering of common stock, of which $0.2 million of
expenses related to the offering were unpaid at quarter-end, and $10.8 million
in proceeds received from exercises of options for our common stock.



Net cash provided by financing activities was approximately $47.2 million for
the nine months ended September 30, 2019, and consisted of $41.2 million in
proceeds received from at-the-market offerings of our common stock, $5.8 million
in proceeds from exercises of options for our common stock and $0.3 million from
the issuance of our common stock under our equity plans.



Funding Requirements



We expect our expenses to increase in connection with our ongoing activities,
particularly as we progress the clinical development of EDIT-101; further
advance our current research programs and our preclinical development
activities, including those related to EDIT-301 and EDIT-201; 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.

We expect that our existing cash, cash equivalents and marketable securities at
September 30, 2020 and anticipated interest income will enable us to fund our
operating expenses and capital expenditure requirements into 2023. 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 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;




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? 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;

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;

? 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. Further, our ability to
continue to raise additional capital may be adversely impacted by potential
worsening global economic conditions and the recent disruptions to, and
volatility in, the credit and financial markets in the United States and
worldwide resulting from the ongoing COVID-19 pandemic.

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
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.

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Contractual Obligations



During the nine months ended September 30, 2020, there were no material changes
to our contractual obligations and commitments described under Management's
Discussion and Analysis of Financial Condition and Results of Operations in

our
Annual Report.


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 SEC rules.





Effects of Inflation



Inflation would generally affect our business by increasing our cost of labor
and clinical trial costs. We do not believe that inflation had a material effect
on our business, financial condition or results of operations during the nine
months ended September 30, 2020 or 2019.

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