You should read this discussion and analysis of our financial condition and
consolidated results of operations together with our unaudited condensed
consolidated financial statements and the related notes appearing elsewhere in
this Quarterly Report on Form 10-Q and our audited financial statements and
related notes for the year ended December 31, 2021, included in our Annual
Report on Form 10-K for the year ended December 31, 2021, or the 2021 Annual
Report, which was filed with the Securities and Exchange Commission, or SEC, on
March 1, 2022. Some of the information contained in this discussion and analysis
or set forth elsewhere in this report, including statements of our plans,
objectives, expectations and intentions, contain forward-looking statements that
involve risks and uncertainties. As a result of many factors, including those
factors set forth in the "Risk Factors" section of this report, our actual
results could differ materially from the results described in or implied by the
forward-looking statements contained in the following discussion and analysis.
Please also see the section titled "Forward-Looking Statements."

Overview


We are a clinical-stage biopharmaceutical company developing a novel class of
medicines, which we refer to as Bicycles, for diseases that are underserved by
existing therapeutics. Bicycles are fully synthetic short peptides constrained
to form two loops which stabilize their structural geometry. This constraint
facilitates target binding with high affinity and selectivity,
making Bicycles attractive candidates for drug development. Bicycles are a
unique therapeutic modality combining the pharmacology usually associated with a
biologic with the manufacturing and pharmacokinetic, or PK, properties of a
small molecule. The relatively large surface area presented by Bicycles allow
targets to be drugged that have historically been intractable to non-biological
approaches. Bicycles are excreted by the kidney rather than the liver and have
shown no signs of immunogenicity to date, which we believe together support a
favorable toxicological profile.

We have a novel and proprietary phage display screening platform which we use to
identify Bicycles in an efficient manner. The platform initially displays linear
peptides on the surface of engineered bacteriophages, or phages, before
"on-phage" cyclization with a range of small molecule scaffolds which can confer
differentiated physicochemical and structural properties. Our platform encodes
quadrillions of potential Bicycles which can be screened to identify molecules
for optimization to potential product candidates. We have used this powerful
screening technology to identify our current portfolio of candidates in oncology
and intend to use it in conjunction with our collaborators to seek to develop
additional future candidates across a range of other disease areas.

Our product candidates, BT5528, BT8009, and BT1718, are each a Bicycle® Toxin
Conjugate, or BTC™. These Bicycles are chemically attached to a toxin that when
administered is cleaved from the Bicycle and kills the tumor cells. We are
evaluating BT5528, a second-generation BTC targeting Ephrin type A receptor 2,
or EphA2, in a company-sponsored Phase I/II clinical trial and BT8009, a
second-generation BTC targeting Nectin-4, in a company-sponsored Phase I/II
clinical trial. In addition, BT1718 is being developed to target tumors that
express Membrane Type 1 matrix metalloproteinase, or MT1 MMP, and is being
investigated for safety, tolerability and efficacy in an ongoing Phase I/IIa
clinical trial sponsored and fully funded by the Cancer Research UK Centre for
Drug Development, or Cancer Research UK. In addition, our other product
candidates, BT7480 and BT7455, are each a Bicycle tumor-targeted immune cell
agonist®, or Bicycle TICATM. A Bicycle TICA links immune cell receptor binding
Bicycles to tumor antigen binding Bicycles. We are evaluating BT7480, a Bicycle
TICA targeting Nectin-4 and agonizing CD137, in a company-sponsored Phase I/II
clinical trial, and we are conducting IND-enabling studies for BT7455, an
EphA2/CD137 Bicycle TICA. Our discovery pipeline in oncology includes
Bicycle-based systemic immune cell agonists and Bicycle TICAs.

On October 7, 2021, we announced interim results from our Phase I clinical trial
of BT5528 and preliminary results from our ongoing Phase 1 clinical trial of
BT8009. We observed signs of anti-tumor activity in our clinical trial of BT5528
in patients with urothelial and ovarian cancer and established a recommended
Phase II dose range. On June 8, 2022, we announced that the first patient had
been dosed in the expansion portion of the Phase I/II study of BT5528 in
urothelial and ovarian cancers, as well as in a basket cohort of other solid
tumors, including non-small cell lung cancer,

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triple-negative breast cancer, head and neck cancer, and esophageal cancer. Enrollment in these cohorts remains ongoing.



In our ongoing Phase I clinical trial of BT8009, we observed signs of anti-tumor
activity in urothelial cancer patients and presented updated results on April
11, 2022. The Phase I clinical trial remains ongoing. Enrollment in the ongoing
Phase IIa portion of a Phase I/IIa clinical trial of BT1718 sponsored and fully
funded by Cancer Research UK has been ongoing. Enrollment in the BT7480 Phase I
trial is ongoing and is progressing on schedule during the dose escalation
portion of the clinical trial.

Beyond our wholly owned oncology portfolio, we are collaborating with
biopharmaceutical companies and organizations in therapeutic areas in which we
believe our proprietary Bicycle screening platform can identify therapies to
treat diseases with significant unmet medical need. Our partnered programs
include collaborations in immuno-oncology, anti-infective, cardiovascular,
ophthalmology, dementia, central nervous system, neuromuscular and respiratory
indications.

COVID-19 Business Update

We continue to closely monitor the ongoing COVID-19 situation. We have allowed
our non-laboratory-based employees to return to the office, however, many
non-laboratory-based employees continue to work remotely. In light of
continually changing circumstances regarding infection rates and local
government recommendations, or if additional restrictions emerge as a result of
COVID-19 variants, we may be required to suspend or reverse efforts to return to
the office in the future.

With respect to clinical development, our CROs have taken measures to utilize
remote and virtual approaches, as necessary, including remote patient monitoring
where possible, to maintain patient safety and trial continuity and to preserve
trial integrity. Changes in circumstances related to the ongoing COVID-19
pandemic could result in pauses in or other impacts on enrollment. We could also
see an impact on the ability to report trial results, or interact with
regulators, ethics committees or other important agencies due to limitations in
regulatory authority employee resources or otherwise. In addition, we cannot
guarantee that our CROs or other third parties will continue to perform their
contractual duties in a timely and satisfactory manner. If additional new
variants of COVID-19 emerge, we could experience significant disruptions to our
clinical development timelines, which would adversely affect our business,
financial condition, results of operations and growth prospects.

As for our third-party manufacturers, distributors and other partners, we are
working closely with them to manage our supply chain activities and mitigate
potential disruptions to our clinical trial materials and supplies as a result
of the ongoing COVID-19 pandemic. We currently expect to have adequate global
supply of clinical trial materials and supplies to support our current clinical
trial activities. However, we could experience disruptions to our supply chain
and operations, and associated delays in the manufacturing and supply of our
products, which would adversely impact our ability to provide investigational
product to our clinical trial sites and to generate sales of and revenues from
our approved products, if approved. Our laboratories in the United Kingdom and
the United States remain operational.

Financial Overview


Since our inception, we have devoted substantially all of our resources to
developing our Bicycle platform and our product candidates, BT5528, BT8009,
BT1718, BT7480, BT7455 and BT7401, conducting research and development of our
product candidates and preclinical programs, raising capital and providing
general and administrative support for our operations. To date, we have financed
our operations primarily with proceeds from the sale of our American Depositary
Shares, or ADSs, ordinary shares, and convertible preferred shares, proceeds
received from upfront payments, research and development payments, and
development milestone payments from our collaboration agreements with Ionis
Pharmaceuticals, Inc., or Ionis, Genentech Inc., or Genentech, the Dementia
Discovery Fund, or DDF, Sanofi (formerly Bioverativ Inc.), AstraZeneca AB, or
AstraZeneca and Oxurion NV, or Oxurion; and borrowings pursuant to our debt
facility with Hercules Capital, Inc., or Hercules. From our inception in 2009
through June 30, 2022, we have received gross proceeds of $558.2 million from
the sale of ADSs, ordinary shares and convertible preferred shares, including
the proceeds from our initial public offering, follow-on offering and at-the-

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market, or ATM, offering program; and $125.2 million of cash payments under our
collaboration revenue arrangements, including $46.6 million from Ionis, $44.0
million from Genentech, $1.7 million from DDF, $10.3 million from AstraZeneca,
$15.0 million from Sanofi, and $6.6 million from Oxurion; and borrowings of
$30.0 million pursuant to our Loan and Security Agreement, or Loan Agreement,
with Hercules. We do not have any products approved for sale and have not
generated any revenue from product sales.

Since our inception, we have incurred significant operating losses. Our ability
to generate product revenue sufficient to achieve profitability will depend on
the successful development and eventual commercialization of one or more of our
product candidates. Our net losses were $26.8 million and $54.4 million for the
three and six months ended June 30, 2022, respectively. As of June 30, 2022, we
had an accumulated deficit of $272.8 million. These losses have resulted
primarily from costs incurred in connection with research and development
activities and general and administrative costs associated with our operations.
We expect to continue to incur significant expenses and increasing operating
losses for the foreseeable future.

We anticipate that our expenses and capital requirements will increase
substantially in connection with our ongoing activities, particularly as we
advance the preclinical activities and clinical trials of our product candidates
and, if any product candidates are approved, pursue the commercialization of
such product candidates by building internal sales and marketing capabilities.
We expect that our expenses and capital requirements will increase substantially
if and as we:

? continue our development of our product candidates, including conducting future

clinical trials of BT5528, BT8009, BT7480 and BT1718;

? progress the preclinical and clinical development of BT7455 and BT7401;

? seek to identify and develop additional product candidates;

develop the necessary processes, controls and manufacturing data to obtain

? marketing approval for our product candidates and to support manufacturing to

commercial scale;

? develop, maintain, expand and protect our intellectual property portfolio;

? seek marketing approvals for our product candidates that successfully complete

clinical trials, if any;

hire and retain additional personnel, such as non-clinical, clinical,

? pharmacovigilance, quality assurance, regulatory affairs, manufacturing,

distribution, legal, compliance, medical affairs, commercial and scientific

personnel;

? acquire or in-license other products and technologies;

expand our infrastructure and facilities to accommodate our growing employee

? base, including adding equipment and infrastructure to support our research and

development; and

add operational, financial and management information systems and personnel,

? including personnel to support our research and development programs and any

future commercialization efforts.


We do not expect to generate revenue from product sales unless and until we
successfully complete development and obtain marketing approval for one or more
of our product candidates, which we expect will take many years and is subject
to significant uncertainty. We have no commercial-scale manufacturing facilities
of our own, and all of our manufacturing activities have been and are planned to
be contracted out to third parties. Additionally, we currently utilize
third-party contract research organizations, or CROs, to carry out our clinical
development activities. If we seek to obtain marketing approval for any of our
product candidates from which we obtain promising results in

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clinical development, we expect to incur significant commercialization expenses as we prepare for product sales, marketing, manufacturing, and distribution.



As a result, we will need substantial additional funding to support our
continuing operations and pursue our growth strategy. Until such time as we can
generate significant revenue from product sales, if ever, we expect to finance
our operations through a combination of equity offerings, debt financings,
collaborations, strategic alliances, charitable and governmental grants,
monetization transactions or licensing arrangements. We may be unable to raise
additional funds or enter into such other agreements or arrangements when needed
on favorable terms, or at all. If we fail to raise capital or enter into such
agreements as, and when, needed, we may have to significantly delay, scale back,
or discontinue the development and commercialization of one or more of our
product candidates. Both the ongoing COVID-19 pandemic and the Russia-Ukraine
war have resulted in a significant disruption of global financial markets. If
the disruption persists and deepens, whether as a result of these events or
otherwise, we could experience an inability to access additional capital.

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

As of June 30, 2022, we had cash and cash equivalents of $372.8 million. We
believe that our existing cash will enable us to fund our operating expenses and
capital expenditure requirements for at least 12 months from the date of filing
of this Quarterly Report on Form 10-Q. We have based this estimate on
assumptions that may prove to be wrong, and we could deplete our available
capital resources sooner than we expect. See "- Liquidity and Capital Resources"
and "Capital Resources and Funding Requirements."

Components of Our Results of Operations

Collaboration Revenues


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.
Our revenue primarily consists of collaboration revenue under our arrangements
with our collaboration partners, including amounts that are recognized related
to upfront payments, milestone payments and option exercise payments, and
amounts due to us for research and development services. In the future, revenue
may include additional milestone payments and option exercise payments, and
royalties on any net product sales under our collaborations. We expect that any
revenue we generate will fluctuate from period to period as a result of the
timing and amount of license, research and development services, milestone

and
other payments.

Expenses

Research and Development Expenses



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

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

compensation expense;

expenses incurred under agreements with third parties that conduct research and


 ? development, preclinical activities, clinical activities and manufacturing on
   our behalf;


 ? the cost of consultants;


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? the cost of lab supplies and acquiring, developing and manufacturing

preclinical study materials and clinical trial materials;

? costs related to compliance with regulatory requirements; and

facilities, depreciation, and other expenses, which include direct and

? allocated expenses for rent and maintenance of facilities, and other operating

costs.


Research and development costs are expensed as incurred. Costs for certain
activities are recognized based on an evaluation of the progress to completion
of specific tasks. Payments for these activities are based on the terms of the
individual agreements, which may differ from the pattern of costs incurred, and
are reflected in our condensed consolidated financial statements as a prepaid
expense or accrued research and development expenses. Nonrefundable advance
payments for goods or services to be received in the future for use in research
and development activities are capitalized. The capitalized amounts are expensed
as the related goods are delivered or the services are performed.

U.K. research and development tax credits and government grant funding are recorded as an offset to research and development expense. See "-Benefit from Income Taxes."



Our direct external research and development expenses are tracked on a
program-by-program basis and consist of costs, such as fees paid to consultants,
contractors and contract manufacturing organizations, or CMOs, in connection
with our preclinical and clinical development activities. Costs incurred after a
product candidate has been designated and that are directly related to the
product candidate are included in direct research and development expenses for
that program. Costs incurred prior to designating a product candidate are
included in other discovery and platform related expense. We do not allocate
employee costs, costs associated with our discovery efforts, laboratory
supplies, and facilities, including depreciation or other indirect costs, to
specific product development programs because these costs are deployed across
multiple product development programs and, as such, are not separately
classified.

In December 2016, we entered into a Clinical Trial and License Agreement with
Cancer Research Technology Limited, or CRTL and Cancer Research UK, pursuant to
which the Cancer Research UK Centre for Drug Development is sponsoring and
funding a Phase I/IIa clinical trial for our product candidate, BT1718, in
patients with advanced solid tumors. Cancer Research UK has designed and
prepared and is carrying out and sponsoring the clinical trial at its own cost.
Upon the completion of the Phase I/IIa clinical trial, we have the right to
obtain a license to the results of the clinical trial upon the payment of a
milestone, in cash and ordinary shares, with a combined value in the mid six
digit dollar amount. If such license is not acquired, or if it is acquired and
the license is terminated and we decide to abandon development of all products
that deliver cytotoxic payloads to the MT1 target antigen, CRTL may elect to
receive an assignment and exclusive license to develop and commercialize the
product on a revenue sharing basis (in which case we will receive tiered
royalties of 70% to 90% of the net revenue depending on the stage of development
when the license is granted is less certain costs, as defined in the agreement).
The Cancer Research UK Agreement contains additional future milestone payments
upon the achievement of development, regulatory and commercial milestones,
payable in cash and shares, with an aggregate total value of $50.9 million, as
well as royalty payments based on a single digit percentage on net sales of
products developed. The Cancer Research UK Agreement can be terminated by either
party upon an insolvency event, material breach of the terms of the contract,
upon a change in control involving a tobacco related entity, and in certain
other specified circumstances, and includes provisions that require the
repayment of costs to Cancer Research UK upon certain termination events. The
costs incurred by Cancer Research UK are recorded as a liability in accordance
with ASC 730, Research and Development as the payments are not based solely on
the results of the research and development having future economic benefit. The
accrual of the liability is recorded as incremental research and development
expense in the condensed consolidated statements of operations and comprehensive
loss. Upon the completion of the Phase IIa part of the clinical trial, we expect
research and development expenses to increase significantly as we expect to fund
the continued development of BT1718, as well as incur additional development
milestone payments.

Research and development activities are central to our business model. Product
candidates in later stages of clinical development generally have higher
development costs than those in earlier stages of clinical development,
primarily due to the increased size and duration of later-stage clinical trials.
We expect that our research and

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development expenses will continue to increase for the foreseeable future as a
result of our expanded portfolio of product candidates and as we: (i) continue
the clinical development and seek to obtain marketing approval for our product
candidates, including BT5528, BT8009, BT7480 and BT1718; (ii) initiate clinical
trials for our product candidates, including BT7455; and (iii) build our
in-house process development and analytical capabilities and continue to
discover and develop additional product candidates.

The successful development of our product candidates is highly uncertain. As
such, 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 remainder
of the development of these product candidates. We are also unable to predict
when, if ever, material net cash inflows will commence from our product
candidates. This is due to the numerous risks and uncertainties associated with
developing products, including the uncertainty of:

whether our business will be adversely affected by the ongoing COVID-19

pandemic, which could materially affect our operations, delay our research

? efforts and clinical trials and cause significant disruption in the operations

and business of third-party manufacturers, contract research organizations, or

CROs, other service providers, and collaborators with whom we conduct business;

and

completing research and preclinical and clinical development of our product

? candidates, including conducting future clinical trials of BT5528, BT8009,

BT7480 and BT1718;

? progressing the preclinical and clinical development of BT7455 and BT7401;

? establishing an appropriate safety profile with IND-enabling studies to advance

our preclinical programs into clinical development;

? identifying new product candidates to add to our development pipeline;

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

? the timing, receipt and terms of any marketing approvals from applicable

regulatory authorities;

? commercializing the product candidates, if and when approved, whether alone or

in collaboration with others;

? establishing commercial manufacturing capabilities or making arrangements with

third party manufacturers;

? the development and timely delivery of commercial-grade drug formulations that

can be used in our clinical trials;

? addressing any competing technological and market developments, as well as any

changes in governmental regulations;

negotiating favorable terms in any collaboration, licensing or other

? arrangements into which we may enter and performing our obligations under such

arrangements;

maintaining, protecting and expanding our portfolio of intellectual property

? rights, including patents, trade secrets and know-how, as well as obtaining and

maintaining regulatory exclusivity for our product candidates;

? continued acceptable safety profile of the drugs following approval; and

? attracting, hiring and retaining qualified personnel.




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A change in the outcome of any of these variables with respect to the
development of a product candidate could mean a significant change in the costs
and timing associated with the development of that product candidate. For
example, the FDA, EMA or another regulatory authority may require us to conduct
clinical trials beyond those that we anticipate will be required for the
completion of clinical development of a product candidate, or we may experience
significant trial delays due to patient enrollment or other reasons, including
the impacts of the ongoing COVID-19 pandemic, in which case we would be required
to expend significant additional financial resources and time on the completion
of clinical development. Changes in circumstances related to the ongoing
COVID-19 pandemic could result in pauses in or other impacts on enrollment. In
addition, we may obtain unexpected results from our clinical trials and we may
elect to discontinue, delay or modify clinical trials of some product candidates
or focus on others. Identifying potential product candidates and conducting
preclinical testing and clinical trials is a time-consuming, expensive and
uncertain process that takes years to complete, and we may never generate the
necessary data or results required to obtain marketing approval and achieve
product sales. In addition, our product candidates, if approved, may not achieve
commercial success.

General and Administrative Expenses


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

Foreign currency transactions in currencies different from the functional
currency of our U.K. entities are translated into the functional currency using
the exchange rates prevailing at the dates of the transactions. Foreign exchange
differences resulting from the settlement of such transactions and from the
translation at period-end exchange rates in foreign currencies are recorded in
general and administrative expense in the statement of operations and
comprehensive loss. As such, our operating expenses may be impacted by future
changes in exchange rates. See "Quantitative and Qualitative Disclosures About
Market Risks" for further discussion.

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

relations.

Other Income (Expense), net

Interest Income

Interest income consists primarily of interest earned on our cash held in operating accounts.

Interest Expense



Interest expense consists primarily of interest expense for financing
arrangements. On September 30, 2020, we entered into the Loan Agreement with
Hercules and borrowed $15.0 million. On March 10, 2021, we entered into the
First Amendment to the Loan and Security Agreement and borrowed an additional
$15.0 million.

Benefit from Income Taxes

We are subject to corporate taxation in the United States and the United
Kingdom. We have generated losses since inception and have therefore not paid
U.K. corporation tax. The benefit from income taxes presented in our condensed
consolidated statements of operations and comprehensive loss is mainly the
result of deferred tax assets benefited in the United States that do not have a
valuation allowance against them because of profits that will be generated by an
intercompany service agreement.

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The research and development tax credit received in the United Kingdom is
recorded as a reduction to research and development expenses. The U.K. research
and development tax credit, as described below, is fully refundable to us after
surrendering tax losses and is not dependent on current or future taxable
income. As a result, we have recorded the entire benefit from the U.K. research
and development tax credit as a reduction to research and development expenses
and is not reflected as part of the income tax provision. If, in the future, any
U.K. research and development tax credits generated are needed to offset a
corporate income tax liability in the United Kingdom, that portion would be
recorded as a benefit within the income tax provision and any refundable portion
not dependent on taxable income would continue to be recorded as a reduction to
research and development expenses.

As a company that carries out extensive research and development activities, we
seek to benefit from one of two U.K. research and development tax credit cash
rebate regimes: The Small and Medium-sized Enterprises R&D Tax Credit Program,
or SME Program, and the Research and Development Expenditure program, or RDEC
Program. Qualifying expenditures largely comprise employment costs for research
staff, consumables, expenses incurred under agreements with third parties that
conduct research and development, preclinical activities, clinical activities
and manufacturing on our behalf and certain internal overhead costs incurred as
part of research projects.

Based on criteria established by U.K. law, a portion of expenditures being
carried out in relation to our pipeline research and development, clinical
trials management and manufacturing development activities were eligible for the
SME Program for the year ended December 31, 2021. For the year ending December
31, 2022, the payable credit claims under the SME Program in excess of £20,000
will be subject to a limitation of three times the total PAYE and NIC liability
paid by the Company, unless an exception applies. That exception requires the
Company to be creating, taking steps to create, or managing intellectual
property, as well as having qualifying research and development expenditure in
respect of connected parties which does not exceed 15% of the total claimed. We
expect a portion of qualifying research and development expenditures that are
subject to the research and development tax credit will decrease in future
periods.

Unsurrendered U.K. losses may be carried forward indefinitely to be offset
against future taxable profits, subject to numerous utilization criteria and
restrictions. The amount that can be offset each year is limited to £5.0 million
plus an incremental 50% of U.K. taxable profits.

Value Added Tax, or VAT, is broadly charged on all taxable supplies of goods and
services by VAT-registered businesses. Under current rates, an amount of 20% of
the value, as determined for VAT purposes, of the goods or services supplied is
added to all sales invoices and is payable to HMRC. Similarly, VAT paid on
purchase invoices is generally reclaimable from HMRC and is included as a
component of prepaid and other current assets in our condensed consolidated

balance sheets.

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Results of Operations

Comparison of the Three Months Ended June 30, 2022 and 2021

The following table summarizes our results of operations for the three months ended June 30, 2022 and 2021:



                                           Three Months Ended
                                               June 30,
                                           2022          2021         Change

                                                    (in thousands)
Collaboration revenues                  $    4,378    $    1,785    $    2,593
Operating expenses:
Research and development                    19,854        11,722         8,132
General and administrative                  11,824         7,340         4,484
Total operating expenses                    31,678        19,062        12,616
Loss from operations                      (27,300)      (17,277)      (10,023)
Other income (expense):
Interest income                                908            23           885
Interest expense                             (883)         (819)          (64)

Total other income (expense), net               25         (796)          

821


Net loss before income tax provision      (27,275)      (18,073)       (9,202)
Benefit from income taxes                    (447)         (160)         (287)
Net loss                                $ (26,828)    $ (17,913)    $  (8,915)


Collaboration Revenues

Collaboration revenues increased by $2.6 million in the three months ended June
30, 2022, compared to the three months ended June 30, 2021, primarily due to
increases of $2.3 million from our collaboration with Ionis entered into in July
2021, and $1.2 million from our collaboration with AstraZeneca as a result of
the expiration of a material right upon the termination of the collaboration
activities related to the fifth target, offset by a decrease of $0.8 million
from our collaboration with Genentech.

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Research and Development Expenses



The table below summarizes our research and development expenses for the period:

                                                      Three Months Ended June 30,
                                                        2022                2021          Change

                                                                   (in thousands)
BT5528 (EphA2)                                     $        2,544      $        1,486    $  1,058
BT8009 (Nectin­4)                                           2,419               1,870         549
BT1718 (MT1)                                                  161                 182        (21)

Bicycle tumor-targeted immune cell agonists                 3,175               2,225         950
Other discovery and platform related expense                4,655               4,344         311
Employee and contractor related expenses                    7,168          

    3,812       3,356
Share-based compensation                                    2,642               1,089       1,553
Facility expenses                                           1,560                 383       1,177

Research and development incentives                       (4,470)             (3,669)       (801)
Total research and development expenses            $       19,854      $   

11,722 $ 8,132




Research and development expenses increased by $8.1 million in the three months
ended June 30, 2022, compared to the three months ended June 30, 2021, due
primarily to an increase of $2.8 million in direct program spend, primarily
associated with clinical program expenses for BT5528 and BT8009 and Bicycle TICA
program development expenses, as well as increases of $3.4 million in employee
and contractor related expenses attributable to increased headcount, $1.6
million of incremental share-based compensation expense, and $1.2 million in
facilities-related expenses primarily associated with our U.K. lease entered
into in December 2021. These increases were offset by $0.8 million of
incremental research and development incentives, including U.K. research and
development tax credit reimbursements due to the corresponding increase in
research and development spending.

We begin to separately track program expenses at candidate nomination, at which
point we will accumulate all direct external program costs to support that
program to date. Through June 30, 2022, we have incurred approximately $23.7
million, $22.4 million, $14.6 million, and $16.0 million of direct external
expenses for the development of the BT5528, BT8009, BT1718, and Bicycle TICA
programs, respectively, since their candidate nominations.

General and Administrative Expenses



The table below summarizes our general and administrative expenses for the
period:

                                              Three Months Ended June 30,
                                                2022                2021         Change

                                                          (in thousands)
Personnel related costs                    $         3,640      $       2,306    $ 1,334
Professional and consulting fees                     2,314              2,077        237
Other general and administration costs               2,159              1,477        682
Share-based compensation                             3,031              1,486      1,545
Effect of foreign exchange rates                       680                

(6) 686 Total general and administrative expenses $ 11,824 $ 7,340 $ 4,484


General and administrative expenses increased by $4.5 million in the three
months ended June 30, 2022, compared to the three months ended June 30, 2021.
This increase is primarily due to a $1.5 million increase in share-based
compensation, an increase of $1.3 million in personnel related costs due to
higher headcount, an increase of $0.7 million in other general and
administrative costs, including insurance expense, to support operations as a
public company, and a $0.7 million unfavorable effect of foreign exchange rates.

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Other Income (Expense), net

Other income (expense), net increased by $0.8 million in the three months ended
June 30, 2022, compared to the three months ended June 30, 2021, primarily due
to interest income related interest earned on our cash equivalents held in
30-day deposit accounts.

Comparison of the Six Months Ended June 30, 2022 and 2021

The following table summarizes our results of operations for the six months ended June 30, 2022 and 2021:



                                          Six Months Ended June 30,
                                             2022             2021          Change

                                                       (in thousands)
Collaboration revenues                  $        8,238     $     3,593    $    4,645
Operating expenses:
Research and development                        34,138          21,415        12,723
General and administrative                      28,783          15,479        13,304
Total operating expenses                        62,921          36,894        26,027
Loss from operations                          (54,683)        (33,301)      (21,382)
Other income (expense):
Interest income                                  1,126              38         1,088
Interest expense                               (1,701)         (1,341)         (360)

Total other income (expense), net                (575)         (1,303)     

728


Net loss before income tax provision          (55,258)        (34,604)      (20,654)
Benefit from income taxes                        (866)           (500)         (366)
Net loss                                $     (54,392)     $  (34,104)    $ (20,288)


Collaboration Revenues

Collaboration revenues increased by $4.6 million in the six months ended June
30, 2022, compared to the six months ended June 30, 2021, primarily due to
increases of $4.6 million from our collaboration with Ionis entered into in July
2021 and $0.9 million from our collaboration with AstraZeneca as a result of the
expiration of a material right upon the termination of the collaboration
activities related to the fifth target, offset by a decrease of $0.7 million
from our collaboration with Genentech.

Research and Development Expenses



The table below summarizes our research and development expenses for the period:

                                                      Six Months Ended June 30,
                                                        2022               2021          Change

                                                                  (in thousands)
BT5528 (EphA2)                                     $        3,946     $        2,824    $  1,122
BT8009 (Nectin­4)                                           3,633              3,496         137
BT1718 (MT1)                                                  348                354         (6)

Bicycle tumor-targeted immune cell agonists                 4,698              3,466       1,232
Other discovery and platform related expense                9,094              7,624       1,470
Employee and contractor related expenses                   12,750          

   7,694       5,056
Share-based compensation                                    5,006              2,299       2,707
Facility expenses                                           2,350                553       1,797

Research and development incentives                       (7,687)            (6,895)       (792)
Total research and development expenses            $       34,138     $    

  21,415    $ 12,723


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Research and development expenses increased by $12.7 million in the six months
ended June 30, 2022, compared to the six months ended June 30, 2021, due
primarily to an increase of $4.0 million in direct program spend, primarily
associated with clinical program expenses for BT5528, Bicycle TICA program
development expenses, and increased other discovery and platform related
expenses, as well as increases of $5.1 million in employee and contractor
related expenses attributable to increased headcount, $2.7 million of
incremental share-based compensation expense, and $1.8 million in
facilities-related expenses. These increases were offset by $0.8 million of
incremental research and development incentives, including U.K. research and
development tax credit reimbursements due to the corresponding increase in
research and development spending.

General and Administrative Expenses



The table below summarizes our general and administrative expenses for the
period:

                                              Six Months Ended June 30,
                                               2022               2021          Change

                                                          (in thousands)
Personnel related costs                    $       6,892      $       4,182    $  2,710

Professional and consulting fees                   5,998              4,318

1,680


Other general and administration costs             4,235              2,845

1,390


Share-based compensation                          10,865              4,097

6,768


Effect of foreign exchange rates                     793                 37

756

Total general and administrative expenses $ 28,783 $ 15,479

$ 13,304




General and administrative expenses increased by $13.3 million in the six months
ended June 30, 2022, compared to the six months ended June 30, 2021. This
increase is primarily due to a $6.8 million increase in share-based compensation
expense primarily associated with our annual employee equity grants in January
2022, an increase of $2.7 million in personnel related costs due to higher
headcount, an increase of $1.7 million in professional and consulting fees, an
increase of $1.4 million in other general and administrative costs, including
insurance expense, to support operations as a public company, and an unfavorable
impact of $0.8 million due to the effect of foreign exchange rates.

Other Income (Expense), net



Other income (expense), net increased by $0.7 million in the six months ended
June 30, 2022, compared to the six months ended June 30, 2021, primarily due to
an increase of $1.1 million in interest income related to interest earned on our
cash equivalents held in 30-day deposit accounts offset by an increase of $0.4
million in interest expense related to an incremental borrowing of $15.0 million
received in March 2021 under the First Amendment to the Loan and Security
Agreement.



Liquidity and Capital Resources

Liquidity


From our inception through June 30, 2022, we have not generated any revenue from
product sales and have incurred significant operating losses and negative cash
flows from our operations. We do not expect to generate significant revenue from
sales of any products for several years, if at all.

To date, we have financed our operations primarily with proceeds from the sale
of our ADSs, ordinary shares, and convertible preferred shares; proceeds
received from upfront payments, payments for research and development services,
and development milestone payments pursuant to collaboration agreements with
Ionis, Genentech, DDF, AstraZeneca, Sanofi and Oxurion; and borrowings pursuant
to our Loan Agreement.

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From our inception in 2009 through June 30, 2022, we have received gross
proceeds of $558.2 million from the sale of ADSs, ordinary shares, and
convertible preferred shares, including the proceeds from our IPO and our ATM
offering program; $125.2 million of cash payments under our collaboration
revenue arrangements including, $46.6 million from Ionis, $44.0 million from
Genentech, $1.7 million from DDF, $10.3 million from AstraZeneca, $15.0 million
from Sanofi and $6.6 million from Oxurion; and $30.0 million in borrowings
pursuant to our Loan Agreement. We do not have any products approved for sale
and have not generated any revenue from product sales.

Cash Flows



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

                                                          Six Months Ended June 30,
                                                             2022              2021

Net cash used in operating activities                   $     (49,931)     $   (26,077)
Net cash used in investing activities                         (14,555)     

(794)


Net cash provided by financing activities                          645     

89,611


Effect of exchange rate changes on cash                        (2,070)     

8

Net (decrease) increase in cash and cash equivalents $ (65,911) $ 62,748




Operating Activities

Net cash used in operating activities for the six months ended June 30, 2022,
was $49.9 million as compared to $26.1 million for the six months ended June 30,
2021. The increase in cash used in operations is primarily due to an increase in
net loss of $20.3 million as described in the Results of Operations above,
offset by an increase in non-cash expenses, including $9.5 million of
share-based compensation expense, and an increase in cash used by changes in our
operating assets and liabilities. The increase in cash used in operating
activities was associated with changes in our operating assets and liabilities,
primarily driven by changes in accounts receivable of $14.9 million, including a
$10.0 million receivable triggered as a result of the Genentech exercise of an
expansion option in June 2022, prepaid expenses and other current assets of $2.7
million based on timing of payments, offset by changes in deferred revenue of
$3.6 million and accrued expenses and other current liabilities of $3.8 million.

Investing Activities



During the six months ended June 30, 2022 and 2021, we used $14.6 million and
$0.8 million, respectively, of cash in investing activities for purchases of
property and equipment, consisting primarily of leasehold improvements and
laboratory equipment.

Financing Activities

During the six months ended June 30, 2022, net cash provided by financing activities was $0.6 million, primarily consisting of net proceeds from our exercise of share options.



During the six months ended June 30, 2021, net cash provided by financing
activities was $89.6 million, primarily consisting of net proceeds from our ATM
of $72.8 million and borrowings of $15.0 million under our Loan Agreement with
Hercules.

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Loan Agreement

We have an outstanding Loan Agreement, as amended from time to time, with
Hercules as agent, consisting of (i) outstanding term loans of $30.0 million and
(ii) subject customary conditions, additional term loans of up to an aggregate
of $45.0 million, which are available through December 31, 2024, but have not
yet been drawn. Borrowings under the Loan Agreement bear interest at an annual
rate equal to the lesser of (x) the greater of (i) 8.05% and (ii) the prime rate
as reported in the Wall Street Journal plus 4.55% and (y) 9.05%. The
interest-only period ends on April 1, 2025. We may prepay all or any portion
greater than $5.0 million of the outstanding borrowings, subject to a prepayment
premium equal to 1.5% prior to December 31, 2023. The Loan Agreement also
provides for an end of term charge, payable upon maturity or the repayment of
obligations under the Loan Agreement, equal to 5.0% of the principal amount
repaid. In connection with the Loan Agreement, we granted Hercules a security
interest in substantially all of our personal property and other assets, other
than our intellectual property. In addition, the Loan Agreement contains
customary affirmative and restrictive covenants and representations and
warranties, as well as customary events of default. For additional information
on the Hercules Loan Agreement, see Note 6. Long-term debt and Note 15.
Subsequent events of our condensed consolidated financial statements.

Capital Resources and Funding Requirements

Our material cash requirements include expenses associated with our ongoing activities, particularly as we advance the preclinical activities and clinical trials of our product candidates and as we:

continue our development of our product candidates, including continuing

? current clinical trials and conducting future clinical trials of BT5528,

BT8009, BT7480 and BT1718;

? progress the preclinical and clinical development of BT7455 and BT7401;

? seek to identify and develop additional product candidates;

develop the necessary processes, controls and manufacturing data to seek to

? obtain marketing approval for our product candidates and to support

manufacturing of product to commercial scale;

? develop, maintain, expand and protect our intellectual property portfolio;

? seek marketing approvals for any of our product candidates that successfully

complete clinical trials, if any;

hire and retain additional personnel, such as non-clinical, clinical,

? pharmacovigilance, quality assurance, regulatory affairs, manufacturing,

distribution, legal, compliance, medical affairs, finance, commercial and

scientific personnel;

? acquire or in-license other products and technologies;

expand our infrastructure and facilities to accommodate our growing employee

? base, including adding equipment and infrastructure to support our research and

development; and

add operational, financial and management information systems and personnel,

? including personnel to support our research and development programs, and any

future commercialization efforts.


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 our
collaboration partners.

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The following table summarizes our material contractual obligations as of June
30, 2022, and the effects that such obligations are expected to have on our
liquidity and cash flows in future periods. For additional information, see Note
11. Commitments and continencies of our condensed consolidated financial
statements.

                                                                Payments due by period
                                                 Less than                                               More than
                                     Total        1 year        1 to 3 years     3 years to 5 years       5 years

                                                                    (in

thousands)


Operating lease commitments (1)     $ 17,940    $     3,858    $        8,005    $             5,666    $       411
Debt obligations (2)                  37,562          2,889            34,673                      -              -
Total                               $ 55,502    $     6,747    $       42,678    $             5,666    $       411

Amounts reflect minimum payments due for our office and laboratory space

leases. We have two office leases in Cambridge, U.K. under operating leases

(1) with lease terms through December 2026. We lease laboratory space in

Lexington, Massachusetts under an operating lease that expires in

December 2027.

(2) Amounts in table reflect the contractually required principal, interest, and

the final payment under the Loan Agreement with Hercules as of June 30, 2022.




In the ordinary course of business, we enter into various agreements with
contract research organizations to provide clinical trial services, with
contract manufacturing organizations to provide clinical trial materials, and
with vendors for preclinical research studies, synthetic chemistry and other
services for operating purposes. These payments are not included in the table
above since the contracts are generally cancelable with advanced written notice,
generally with a notice period of 90 days or less. From the time of notice until
termination, we are contractually obligated to make certain minimum payments to
the vendors, based on the timing of the notification and the exact terms of the
agreement.

Our arrangements with CRUK provide for additional future milestone payments upon
the achievement of development, regulatory and commercial milestones, payable in
cash and shares, with an aggregate total value of $111.2 million, as well as
royalty payments based on a single digit percentage on net sales of products
developed. In addition, in November 2020, we entered into a settlement and
license agreement with Pepscan Systems B.V., and its affiliates, or Pepscan,
regarding our use of Pepscan's CLIPS peptide technology, which agreement
provides for additional future milestone payments by us upon the achievement of
development, regulatory and commercial milestones, with an aggregate total value
of $92.4 million. We have not included future payments under this agreement in
the table of contractual obligations above since these obligations are
contingent upon future events. As of June 30, 2022, we were unable to estimate
the timing or likelihood of achieving these milestones.

As of June 30, 2022, we had cash and cash equivalents of $372.8 million. We
expect that our existing cash will enable us to fund our operating expenses and
capital expenditure requirements for at least 12 months from the date of filing
of this Quarterly Report on Form 10-Q.

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

our ability to raise capital in light of the impacts of the ongoing COVID-19

? pandemic, the Russia-Ukraine war, and other adverse global or geo-political

events on the global financial markets;

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


 ? development, laboratory testing, and clinical trials for the product candidates
   we may develop;


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our ability to enroll clinical trials in a timely manner and to quickly resolve

? any delays or clinical holds that may be imposed on our development programs,

particularly in light of the ongoing COVID-19 pandemic;

? the costs associated with our manufacturing process development and evaluation

of third-party manufacturers and suppliers;

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

the costs of preparing and submitting marketing approvals for any of our

? product candidates that successfully complete clinical trials, and the costs of

maintaining marketing authorization and related regulatory compliance for any

products for which we obtain marketing approval;

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 of future activities, including product sales, medical affairs,

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

which we receive marketing approval;

the terms of our current and any future license agreements and collaborations;

? and the extent to which we acquire or in-license other product candidates,

technologies and intellectual property.

? the success of our collaborations with Ionis, Genentech, DDF, AstraZeneca,

Oxurion and other partners;

? our ability to establish and maintain additional collaborations on favorable

terms, if at all; and

? the costs of operating as a public company.




Until such time, if ever, that we can generate product revenue sufficient to
achieve profitability, we expect to finance our cash needs through a combination
of equity offerings, debt financings, collaborations, monetization transactions,
government contracts or other strategic transactions. To the extent that we
raise additional capital through the sale of equity, ownership interests of
existing holders of our ADSs and ordinary shares will be diluted, and the terms
of these securities may include liquidation or other preferences that adversely
affect the rights of holders of our ADSs or ordinary shares. If we raise
additional funds through collaboration agreements, strategic alliances,
licensing arrangements, monetization transactions, or marketing and distribution
arrangements, we may have to relinquish valuable rights to our technologies,
future revenue streams, research programs or product candidates or grant
licenses on terms that may not be favorable to us or grant rights to develop and
market products or product candidates that we would otherwise prefer to develop
and market ourselves. Future debt financing, if available, may involve covenants
restricting our operations or our ability to incur additional debt. Any debt or
equity financing that we raise may contain terms that are not favorable to us or
our shareholders. Both the ongoing COVID-19 pandemic and the rapidly evolving
conflict between Russia and Ukraine have resulted in significant disruptions to
global financial markets. If these disruptions persist or deepen, we could
experience an inability to access additional capital, which could in the future
negatively affect our 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.

Critical Accounting Estimates


Our management's discussion and analysis of financial condition and results of
operations is based on our condensed consolidated financial statements, which
have been prepared in accordance with U.S. GAAP. The preparation of our
condensed consolidated financial statements and related disclosures requires us
to make estimates, assumptions and judgments that affect the reported amount of
assets, liabilities, revenue, costs and expenses, and related disclosures. We
base our estimates on historical experience, known trends and events and various
other factors that we believe are

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reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. We evaluate our estimates and assumptions on an ongoing basis. Our actual results may differ from these estimates under different assumptions or conditions.



Our critical accounting policies are described under the heading "Management's
Discussion and Analysis of Financial Condition and Results of
Operations-Critical Accounting Estimates" in our 2021 Annual Report, which was
filed with the SEC on March 1, 2022. If actual results or events differ
materially from the estimates, judgments and assumptions used by us in applying
these policies, our reported financial condition and results of operations could
be materially affected. Other than as disclosed in Note 2 to the condensed
consolidated financial statements included in this Quarterly Report on Form
10-Q, there have been no significant changes to our critical accounting
estimates from those described in our 2021 Annual Report.

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