The following discussion and analysis of our financial condition and results of
operations should be read in conjunction with our unaudited condensed
consolidated financial statements and related notes appearing elsewhere in this
Quarterly Report on Form 10-Q and our audited consolidated financial statements
and related notes for the year ended December 31, 2021 included in our Annual
Report on Form 10-K filed with the Securities and Exchange Commission, or the
SEC. As a result of many factors, including those factors set forth in the "Risk
Factors" section of our Annual Report on Form 10-K for the year end
December 31, 2021, 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.

Overview


We are a clinical-stage biopharmaceutical company developing a new class of
immunotherapeutics based on our proprietary arenavirus platform that is designed
to target and amplify T cell immune responses to fight diseases. We believe that
our technologies can meaningfully leverage the human immune system for
prophylactic and therapeutic purposes by inducing CD8+ T cell response levels
previously not achieved by other immunotherapy approaches.

We are building a proprietary immuno-oncology pipeline by targeting oncoviral
cancer antigens, self-antigens and next-generation antigens. Our oncology
portfolio includes three disclosed programs, HB-200, HB-300, and HB-700, all of
which use our replicating technology. HB-200 is in clinical development for the
treatment of Human Papillomavirus 16-positive cancers, or HPV16+, with an
ongoing Phase 1/2 clinical trial. HB-300 is in development for the treatment of
prostate cancer and expected to move into the clinic in the first quarter of
2023. HB-700 is our newest asset in preclinical development for treatment of
KRAS mutated cancers, including, lung, colorectal and pancreatic cancers.

Our HB-200 program is comprised of HB-201 single vector therapy and
HB-201/HB-202 two vector therapy. Both therapies are being evaluated in an
ongoing HB-200 Phase 1/2 clinical trial. In November 2021, we announced interim
data from our ongoing Phase 1 portion of the study, showing promising anti-tumor
activity against advanced/metastatic HPV16+ cancers and favorable tolerability
for HB-200, both as a single and alternating 2-vector product candidate. In the
second quarter of 2022, data presented at scientific conferences showed that
HB-201/HB-202 alternating 2-vector candidate induced immune and clinical
responses, as well as stable disease in HPV16+ advanced metastatic/recurrent
head and neck cancer patients who failed prior standard of care therapy. We
believe that these early-stage data establish proof of concept for our
replicating viral vector immunotherapy candidate in oncology.

Based on safety, anti-tumor activity and T cell response data observed to date,
we plan to test HB-202/HB-201 in combination with pembrolizumab in 1st line and
2nd line patients at the recommended phase 2 dose (RP2D). To achieve this aim,
we initially assessed single-vector HB-201 in combination with pembrolizumab in
a small cohort as a safety lead-in. Subsequently we evaluated pembrolizumab in
combination with the alternating 2-vector HB-202/HB-201 approach at a dose below
the RP2D. Finally, we began the alternating 2-vector system at RP2D. In
addition, we are evaluating HB-200 in a small number of patients at the RP2D as
a stand alone therapy, in patients who have progressed on standard of care.

In September 2021, we entered into a clinical collaboration with Merck & Co., Inc. to evaluate the combination of HB-200 and Merck & Co., Inc's anti-PD-1 therapy, KEYTRUDA® (pembrolizumab) in a separate randomized Phase 2 trial.



Our non-replicating prophylactic Cytomegalovirus, or CMV, vaccine candidate,
HB-101, is a potential first in-class compound in a Phase 2 clinical trial for
patients awaiting kidney transplantation. In November 2021, we reported safety,
immunogenicity and efficacy data, whereby the three-dose schedule of HB-101
pre-transplantation showed a trend of reducing incidence of CMV viremia and
antiviral use. The trial will continue to follow patients currently on-study
with final top-line data readout in the first half of 2023. We have decided to
pursue HB-101 further only if we are able to partner the program with a
collaborator, thereby enabling greater strategic focus on the immuno-oncology
programs.

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We have funded our operations to date primarily from public offerings of common
stock and convertible preferred stock, including our initial public offering, as
well as private placements of our redeemable convertible preferred stock, grant
funding and loans from an Austrian government agency, and upfront, milestone and
initiation payments from Gilead in connection with a research collaboration and
license agreement.

On April 23, 2019, we completed an initial public offering of our common stock,
the IPO, in which we issued 6.0 million shares of our common stock, at
$14.00 per share, for gross proceeds of $84.0 million, or net proceeds of
$74.6 million. On December 11, 2020, we completed a follow-on public offering in
which we issued 3.9 million shares of our common stock, at $11.75 per share, and
2,978 shares of our Series A convertible preferred stock, at $11,750.00 per
share, for net proceeds of $75.0 million after deducting underwriting discounts
and commissions and offering expenses. In addition, in February 2022, Gilead
purchased 1.7 million shares of our common stock for $5.0 million. On
March 4, 2022, we completed a follow-on public offering in which we issued
21.7 million shares of our common stock, at $2.00 per share, and 15,800 shares
of our Series A-1 convertible preferred stock, at $2,000.00 per share, for net
proceeds of $70.2 million after deducting underwriting discounts and commissions
and offering expenses. As of June 30, 2022, the principal amount outstanding
under loans from government agencies was $2.8 million and we had cash, cash
equivalents and restricted cash of $118.9 million.

We do not expect to generate revenue from any product candidates that we develop
until we obtain regulatory approval for one or more of such product candidates,
if at all, and commercialize our products or enter into additional collaboration
agreements with third parties. Substantially all of our net losses have resulted
from costs incurred in connection with our research and development programs and
from general and administrative costs associated with our operations.

All of our product candidates, including our most advanced oncology product
candidate, HB-200, will require substantial additional development time and
resources before we would be able to apply for and receive regulatory approvals
and begin generating revenue from product sales. Before launching our first
products, if approved, we plan to establish our own manufacturing facility to
reduce or eliminate our reliance on contract manufacturing organizations, or
CMOs, which will require substantial capital expenditures and cause additional
operating expenses. We currently have no marketing and sales organization and
have no experience in marketing products; accordingly, we will incur significant
expenses to develop a marketing organization and sales force in advance of
generating any commercial product sales. As a result, we will need substantial
additional capital to support our operating activities. In addition, we expect
to continue to incur legal, accounting and other expenses in operating our
business, including the costs associated with operating as a public company.

We currently anticipate that we will seek to fund our operations through equity
or debt financings or other sources, such as government grants and additional
collaboration agreements with third parties. Adequate funding may not be
available to us on acceptable terms, or at all. If sufficient funds on
acceptable terms are not available when needed, we will be required to
significantly reduce our operating expenses and delay, reduce the scope of, or
eliminate one or more of our development programs.

We have incurred net losses each year since our inception in 2011, including net
losses of $16.4 million and $34.3 million for the three and six months ended
June 30, 2022. As of June 30, 2022, we had an accumulated deficit of
$257.1 million and we do not expect positive cash flows from operations in the
foreseeable future, if ever. We expect to continue to incur net operating losses
for at least the next several years as we advance our product candidates through
clinical development, seek regulatory approval, prepare for and, if approved,
proceed to commercialization, continue our research and development efforts and
invest to establish further commercial manufacturing capacity.

Special Note About Coronavirus (COVID-19)



In March 2020, we announced initial potential business impacts related to the
outbreak of a novel strain of virus named SARS-CoV-2 (severe acute respiratory
syndrome 2), or coronavirus, which causes coronavirus disease, or COVID-19. As a
result of the ongoing COVID-19 pandemic, we have experienced, and may further
experience, disruptions that have and could further adversely impact our
business operations as well as our preclinical studies and clinical trials.
Specifically, nearly all of the Phase 2 trial sites we utilize for our HB-101
Phase 2 trial had temporarily

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suspended enrollment of patients, resumed patient enrollment, but suspended
enrollment again during periods of increased confirmed infections in the United
States and Europe. As a result, the total number of patients in the trial at the
conclusion of enrollment in June 2021 was below the originally planned number of
patients. While we have since commenced enrollment in this trial, we continue to
evaluate the impact of the ongoing COVID-19 pandemic on our trials.

In addition, certain aspects of our supply chain were temporarily impacted as
certain of our third-party suppliers and manufacturers had paused their
operations in response to the COVID-19 pandemic or had otherwise encountered
delays in providing their services. The uncertainties resulting from the
COVID-19 pandemic led us to temporarily focus on our core program, HB-200, as
well as research and development activities under our collaboration with Gilead.
Certain earlier stage programs, including HB-300 were temporarily de-prioritized
and only allocated the resources that could be made available without impacting
our core programs. While we have resumed activities for these earlier stage
programs in 2021, we continue to evaluate the extent to which potential
constraints of our third-party suppliers and manufacturers will impact our
ability to manufacture our product candidates for our clinical trials and
conduct other research and development operations and maintain applicable
timelines. The ultimate impact of the coronavirus pandemic on our business
operations as well as our preclinical studies and clinical trials remains
uncertain and subject to change and will depend on future developments, which
cannot be accurately predicted. We will continue to monitor the situation
closely.

Furthermore, in order to preserve resources and liquidity during the pandemic,
all of our officers had waived at least 25% of their cash salaries for the three
months ended June 30, 2020, and the vast majority of our employees agreed to a
temporary salary reduction of 20% for the three months ended June 30, 2020. We
compensated our officers and employees for the forgone cash salaries by issuing
restricted stock units in July 2020. During 2020, our directors also elected to
receive equity instead of cash for their accrued board fees. Staff may work from
home in accordance with our "working from home" policy.

Components of Our Results of Operations

Revenue from collaboration and licensing

To date, we have not generated any revenue from product sales and do not expect to do so in the near future, if at all. All of our revenue to date has been derived from a research collaboration and license agreement with Gilead.



On June 4, 2018, we entered into a Research Collaboration and License Agreement,
or the Collaboration Agreement, with Gilead to evaluate potential vaccine
products using or incorporating our replicating technology and non-replicating
technology for the treatment, cure, diagnosis or prevention of HBV and HIV.

Under the Collaboration Agreement, we granted Gilead an exclusive,
royalty-bearing license to our technology platform for researching, developing,
manufacturing and commercializing products for HIV or HBV. We received a
non-refundable $10.0 million upfront payment upon entering the Collaboration
Agreement. In February 2022, we signed an amended and restated collaboration
agreement, the Restated Collaboration Agreement, which revised the terms only
for the HIV program, whereby we will take on development responsibilities for
the HIV program candidate through a Phase 1b clinical trial. Pursuant to the
Restated Collaboration Agreement, Gilead will retain an exclusive right, the
Option, to take back the development responsibilities, thus keeping the rights
for the HIV program, including further development and commercialization in
return for an option exercise payment of $10.0 million. Pursuant to the Restated
Collaboration Agreement, we are eligible for up to $140.0 million in
developmental milestone payments for the HBV program and $50.0 million in
commercialization milestone payments. If Gilead exercises the Option, we are
eligible for up to $172.5 million in developmental milestone payments for the
HIV program, inclusive of the $10.0 million Option exercise payment, and
$65.0 million in commercialization milestone payments for the HIV program. Upon
the commercialization of a product, we are eligible to receive tiered royalties
of a high single-digit to mid-teens percentage on the worldwide net sales of
each HBV product, and royalties of a mid-single-digit to 10% of worldwide net
sales of each HIV product. Gilead is obligated to reimburse us for our costs,
including all benefits, travel, overhead, and any other expenses, relating to
performing research and development activities under the Restated Collaboration
Agreement with respect to the HBV program and, if the Option is exercised, any
manufacturing costs related to the HIV program.

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Through June 30, 2022, we have received from Gilead the non-refundable upfront
payment of $10.0 million, $16.2 million in milestone payments for the
achievement of pre-clinical research milestones, and the initiation payment of
$15.0 million upon execution of the Restated Collaboration Agreement to fund our
future performance of development activities under the Restated Collaboration
Agreement. In addition, we have recognized $38.1 million of cost reimbursements
for research and development services performed under the Collaboration
Agreement.

We determined that our performance obligations under the terms of the original
Collaboration Agreement included one combined performance obligation for each of
the HBV and HIV research programs, comprised of the transfer of intellectual
property rights and providing research and development services. Accordingly, we
recognized these amounts as revenue over the performance period of the
respective services on a percent of completion basis using total estimated
research and development labor hours for each of the performance obligations.
The terms of the Restated Collaboration Agreement added an additional
performance obligation to the Company to perform research and development work
for the HIV program. We recognize the amounts of revenue allocated to the
performance obligation resulting from the Restated Collaboration Agreement on a
percent of completion basis over the performance period, using total estimated
research and development costs as the measure of progress.

Operating Expenses

Our operating expenses since inception have only consisted of research and development costs and general administrative costs.

Research and Development Expenses


Since our inception, we have focused significant resources on our research and
development activities, including establishing our arenavirus platform,
conducting preclinical studies, developing a manufacturing process, conducting a
Phase 1 clinical trial and the ongoing Phase 2 clinical trial for HB-101 as well
as the ongoing HB-200 Phase 1/2 study, and preparing an investigational new
drug, or IND, application for HB-300. Research and development activities
account for a significant portion of our operating expenses. Research and
development costs are expensed as incurred. These costs include:

? salaries, benefits and other related costs, including stock-based compensation,

for personnel engaged in research and development functions;

expenses incurred in connection with the preclinical development of our

? programs and clinical trials of our product candidates, including under

agreements with third parties, such as consultants, contractors, academic

institutions and contract research organizations, CROs;

? the cost of manufacturing drug products for use in clinical trials, including

under agreements with third parties, such as CMOs, consultants and contractors;




 ? laboratory costs; and


? leased facility costs, equipment depreciation and other expenses, which include

direct and allocated expenses.




The majority of our research and development costs are external costs, which we
track on a program-by-program basis. We do not track our internal research and
development expenses on a program-by-program basis as they primarily relate to
shared costs deployed across multiple projects under development.

We expect our research and development expenses to increase substantially in the
future as we advance our existing and future product candidates into and through
clinical trials and pursue regulatory approval. The process of conducting the
necessary clinical studies to obtain regulatory approval is costly and
time-consuming. Clinical trials generally become larger and more costly to
conduct as they advance into later stages and, in the future, we will be
required to make estimates for expense accruals related to clinical trial
expenses.

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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 that we develop from our programs. We are
also unable to predict when, if ever, material net cash inflows will commence
from sales of product candidates we develop, if at all. This is due to the
numerous risks and uncertainties associated with developing product candidates,
including the uncertainty of:

? successful completion of preclinical studies and clinical trials;

? sufficiency of our financial and other resources to complete the necessary

preclinical studies and clinical trials;

? acceptance of INDs for our planned clinical trials or future clinical trials;

? successful enrollment and completion of clinical trials;

? successful data from our clinical program that support an acceptable

risk-benefit profile of our product candidates in the intended populations;

? receipt and maintenance of regulatory and marketing approvals from applicable

regulatory authorities;

? scale-up of our manufacturing processes and formulation of our product

candidates for later stages of development and commercialization;

establishing our own manufacturing capabilities or agreements with third-party

? manufacturers for clinical supply for our clinical trials and commercial

manufacturing, if our product candidate is approved;

? entry into collaborations to further the development of our product candidates;

? obtaining and maintaining patent and trade secret protection or regulatory

exclusivity for our product candidates;

? successfully launching commercial sales of our product candidates, if and when

approved;

? acceptance of the product candidates benefits and uses, if and when approved,

by patients, the medical community and third-party payors;

? the prevalence and severity of adverse events experienced with our product

candidates;

? maintaining a continued acceptable safety profile of the product candidates

following approval;

? effectively competing with other therapies;

? obtaining and maintaining healthcare coverage and adequate reimbursement from

third-party payors; and

? qualifying for, maintaining, enforcing and defending intellectual property

rights and claims.




A change in the outcome of any of these variables with respect to the
development of a product candidate could mean a significant change in the costs
and timing associated with the development of that product candidate. For
example, if the U.S. Food and Drug Administration or another regulatory
authority were to require us to conduct clinical trials beyond those that we
anticipate will be required for the completion of clinical development of a
product candidate, or if we experience significant delays in our clinical trials
due to patient enrollment or other reasons, we would be required to expend
significant additional financial resources and time on the completion of
clinical development.

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The following table summarizes our research and development expenses by product candidate or program (in thousands):



                                                  Three months ended June 30,           Six months ended June 30,
                                                    2022                2021             2022               2021
HB-200 program                                 $        6,043      $        7,624    $      13,456      $      17,378
HB-300 program                                          1,913               1,048            4,680              2,298

Gilead partnered programs(1)                            3,633               4,639            5,366              9,459
Other and earlier-stage programs                        3,987               5,078            8,076              8,721
Other unallocated research and development
expenses                                                  571               1,183            1,189              1,880

Total research and development expenses $ 16,147 $ 19,572 $ 32,767 $ 39,736

(1) Expenses incurred in connection with Gilead partnered programs were fully reimbursed by Gilead in 2021 and partially reimbursed in 2022, and such reimbursements were accounted for as revenue.

Other unallocated research and development expenses include stock-based compensation expense, certain lease expenses and other operating expenses that we do not track on a program-by-program basis, since our research and development employees and infrastructure ressources are utilized across our programs.

General and Administrative Expenses



Our general and administrative expenses consist primarily of personnel costs in
our executive, finance and investor relations, business development and
administrative functions. Other general and administrative expenses include
consulting fees and professional service fees for auditing, tax and legal
services, lease expenses related to our offices, premiums for directors and
officers liability insurance, intellectual property costs incurred in connection
with filing and prosecuting patent applications as well as third-party license
fees, depreciation and other costs. We expect our general and administrative
expenses to continue to increase in the future as we expand our operating
activities and prepare for potential commercialization of our current and future
product candidates, increase our headcount and investor relations activities and
maintain compliance with requirements of the Nasdaq Global Select Market and the
Securities and Exchange Commission.

Grant Income



Since inception, we have received grants from the Austrian Research Promotions
Agency, either under funding agreements or under research incentive programs. In
addition, we have received loans under funding agreements that bear interest at
below market interest rate. We account for the grants received as other income
and for the imputed benefits arising from the difference between a market rate
of interest and the rate of interest as additional grant income, and record
interest expense for the loans at a market rate of interest.

We participate in a research incentive program provided by the Austrian
government under which we are entitled to reimbursement of a percentage of
qualifying research and development expenses and capital expenditures incurred
in Austria. Submissions for reimbursement under the program are submitted
annually. Incentive amounts are generally paid out during the calendar year that
follows the year of the expenses but remain subject to subsequent examinations
by the responsible authority.

Interest Expense

Interest expense results primarily from loans under funding agreements with the
Austrian Research Promotion Agency, recorded at a market rate of interest. The
difference between interest payments payable pursuant to the loans, which rates
are at below market interest rates, and the market interest rate, is accounted
for as grant income.

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Income Taxes

Income tax expense results from foreign minimum income tax and profit on a legal
entity basis. The losses that we have incurred since inception result primary
from the losses of our Austrian subsidiary. We have considered that, at this
point in time, it is uncertain whether we will ever be able to realize the
benefits of the deferred tax asset, and accordingly, have established a full
valuation allowance as of June 30, 2022.

Results of Operations

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

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



                                                 Three months ended June 30,           Six months ended June 30,
                                                   2022                2021               2022             2021
Revenue from collaboration and licensing      $         2,746     $         5,378    $        4,191     $    10,679
Operating expenses:
Research and development                             (16,147)            (19,572)          (32,767)        (39,736)
General and administrative                            (5,026)             (5,095)           (9,998)         (9,404)
Total operating expenses                             (21,173)            (24,667)          (42,765)        (49,140)
Loss from operations                                 (18,427)            (19,289)          (38,574)        (38,461)
Other income (expense):
Grant income                                            1,958               2,505             3,845           4,709
Interest income                                           182                   7               189              14
Interest expense                                        (231)               (218)             (474)           (437)

Other income and expenses, net                            163               (158)               691           (216)
Total other income (expense), net                       2,072              

2,136             4,251           4,070
Net loss before tax                                  (16,355)            (17,153)          (34,323)        (34,391)
Income tax expense                                        (1)                 (0)               (1)             (0)
Net loss                                      $      (16,356)     $      (17,153)    $     (34,324)     $  (34,391)


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Revenue from Collaboration and Licensing



Revenue was $2.7 million and $4.2 million for the three and six months ended
June 30, 2022, respectively, and $5.4 million and $10.7 million for the three
and six months ended June 30, 2021, respectively.

During the three and six months ended June 30, 2022 revenue decreased by $2.7 million and $6.5 million, respectively, compared to the three and six months ended June 30, 2021. This decrease was primarily due to lower cost reimbursements received under the Collaboration Agreement with Gilead.

Furthermore, the $4.0 million milestone payment and the $15.0 million initiation fee received in the three months ended March 31, 2022 remained recorded as deferred revenue to be recognized in future accounting periods.



For the three months ended June 30, 2022 and 2021, revenue included $1.7 million
and $4.4 million, respectively, from reimbursement of research and development
expenses, and $1.0 million from partial recognition of milestone and initiation
payments that were initially recorded as deferred revenue.

For the six months ended June 30, 2022 and 2021, revenue included $2.5 million
and $9.0 million, respectively, from reimbursement of research and development
expenses, and $1.6 million and $1.7 million, respectively, from partial
recognition of milestone and initiation payments that were initially recorded as
deferred revenue.

Research and Development Expenses

For the three and six months ended June 30, 2022, our research and development expenses were $16.1 million and $32.8 million, respectively, compared to $19.6 million and $39.7 million for the three and six months ended June 30, 2021.



The decrease of $3.5 million for the three months ended June 30, 2022 compared
to the three months ended June 30, 2021 was attributable to a decrease in direct
research and development expenses of $3.0 million, and a decrease in indirect
research and development expenses of $0.5 million. The decrease in direct
research and development expenses was primarily driven by lower manufacturing
expenses for our HB-200 and Gilead partnered programs. Indirect research and
development expenses decreased mainly because of a decrease in personnel related
expenses including stock based compensation, and a decrease in laboratory
consumables, partially offset by an increase in professional and consulting fees
and an increase in training and recruitment expenses.

The decrease of $6.9 million for the six months ended June 30, 2022 compared to
the six months ended June 30, 2021 was attributable to a decrease in direct
research and development expenses of $6.5 million, and a decrease in indirect
research and development expenses of $0.4 million. The decrease in direct
research and development expenses was primarily driven by lower manufacturing
expenses for our HB-200 and Gilead partnered programs and lower clinical study
expenses due to the completion of patient enrollment of the Phase 2 trial for
our HB-101 program, partially offset by higher expenses for external research
and development services. Indirect research and development expenses decreased
mainly because of a decrease in personnel related expenses including stock based
compensation, and a decrease in laboratory consumables, partially offset by an
increase in professional and consulting fees and an increase in training and
recruitment expenses.

General and Administrative Expenses



General and administrative expenses for the three months ended June 30, 2022
were $5.0 million, compared to $5.1 million for the three months ended
June 30, 2021. The decrease of $0.1 million was primarily due to a decrease in
personnel-related expenses of $0.9 million, a decrease in other expenses of
$0.2 million, partially offset by an increase in professional and consulting
fees of $0.9 million. The decrease in personnel-related expenses resulted from
decreased stock compensation expenses, the conversion of a portion of the base
salaries of the Company's executive team for the six months ended June 30, 2022
into common stock with a fair value below the conversion rate, partially offset
by a growth in headcount along with increased salaries in our general and
administrative functions. The increase in professional and consulting fees was
primarily attributable to the purchase of third-party services and to
$0.6 million of

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intellectual property costs incurred in connection with filing and prosecuting patent applications as well as third-party license fees.


General and administrative expenses for the six months ended June 30, 2022 were
$10.0 million, compared to $9.4 million for the six months ended June 30, 2021.
The increase of $0.6 million was primarily due to an increase in professional
and consulting fees of $1.6 million, partially offset by a decrease in
personnel-related expenses of $0.8 million. The decrease in personnel-related
expenses resulted from decreased stock compensation expenses, the conversion of
a portion of the base salaries of the Company's executive team for the six
months ended June 30, 2022 in common stock, partially offset a growth in
headcount along with increased salaries in our general and administrative
functions. The increase in professional and consulting fees was primarily
attributable to the purchase of third-party services and to $1.2 million of
intellectual property costs incurred in connection with filing and prosecuting
patent applications as well as third-party license fees.

Grant Income



In the three months ended June 30, 2022 we recorded grant income of
$2.0 million, compared to $2.5 million in the three months ended June 30, 2021.
Income from grants mainly included research incentives and imputed benefits from
below market interest rates on loans from governmental agencies. The decrease of
$0.5 million was primarily due to lower income from Austrian research and
development incentives as a result of lower eligible research and development
expenses.

In the six months ended June 30, 2022 we recorded grant income of $3.8 million,
compared to $4.7 million in the six months ended June 30, 2021. Income from
grants mainly included research incentives and imputed benefits from below
market interest rates on loans from governmental agencies. The decrease of
$0.9 million was primarily due to lower income from Austrian research and
development incentives as a result of lower eligible research and development
expenses.

Interest Income and Expense

Interest income was $0.2 million for the three and six months ended
June 30, 2022, respectively, compared to interest income of less than
$0.1 million for the three and six months ended June 30, 2021. The increase in
interest income for the three months ended June 30, 2022 was a result of the
rising U.S. dollar interest rates. Interest income represents interest from cash
and cash equivalents held in U.S. dollars resulting from the proceeds from the
issuance of common and preferred stock as well as payments received under our
Collaboration Agreement with Gilead. During the three and six months ended
June 30, 2022 our cash, cash equivalents and restricted cash were mainly held in
dollars at U.S. investment grade financial institutions or in money market
funds. In addition, smaller amounts were held in euros at our Austrian
subsidiary that produced no material interest income due the low or zero
interest rate policy in the European Monetary Union.

Interest expenses for loans from government agencies were $0.2 million for the
three months ended June 30, 2022 and for the three months ended June 30, 2021.
Interest expenses for loans from government agencies were $0.5 million for the
six months ended June 30, 2022 and $0.4 million for the six months ended
June 30, 2021. Interest expense was recorded at the market rate of interest,
which exceeded the contractual interest.

Other Income and Expenses



Other income was $0.2 million for the three months ended June 30, 2022, compared
to other expenses of $0.2 million for the three months ended June 30, 2021. The
change resulted primarily from exchange rate differences and foreign currency
remeasurements.

Other income was $0.7 million for the six months ended June 30, 2022, compared
to other expenses of $0.2 million for the six months ended June 30, 2021. The
change resulted primarily from exchange rate differences and foreign currency
remeasurements.

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Liquidity and Capital Resources



Since our inception in 2011, we have funded our operations primarily from public
offerings and private placements of common stock and convertible preferred
stock, including our initial public offering, as well as private placements of
our redeemable convertible preferred stock, grant funding and loans from an
Austrian government agency, and upfront, milestone and initiation payments from
Gilead in connection with a research collaboration and license agreement.

Prior to our IPO, we raised gross proceeds of approximately $142.5 million from
the issuance of our redeemable convertible preferred stock. In April 2019, we
completed our IPO in which we issued and sold 6,000,000 shares of our common
stock, at $14.00 per share, for gross proceeds of $84.0 million, or net proceeds
of $74.6 million. On December 11, 2020, we completed a follow-on public offering
in which we issued 3,910,000 shares of our common stock, at $11.75 per share,
and 2,978 shares of our Series A convertible preferred stock, at $11,750.00 per
share, for net proceeds of $75.0 million after deducting underwriting discounts
and commissions and offering expenses. In addition, in February 2022, Gilead
purchased 1,666,666 shares of our common stock for $5.0 million. On
March 4, 2022, we completed a follow-on public offering in which we issued
21,700,000 shares of our common stock, at $2.00 per share, and 15,800 shares of
our Series A-1 convertible preferred stock, at $2,000.00 per share, for net
proceeds of $70.2 million after deducting underwriting discounts and commissions
and offering expenses. We also received $41.2 million from non-refundable
upfront, milestone and initiation payments pursuant to the Restated
Collaboration Agreement with Gilead. As of June 30, 2022, we had cash, cash
equivalents and restricted cash of $118.9 million.

We entered into various funding agreements with the Austrian Research Promotion
Agency, (Österreichische Forschungsförderungsgesellschaft, or FFG). The loans by
FFG, or the FFG Loans, were made on a project-by-project basis and bear interest
at a rate of 0.75% per annum. In the event that the underlying program research
results in a scientific or technical failure, the principal then outstanding
under any loan may be forgiven by FFG and converted to non-repayable grant
funding on a project-by-project basis. The FFG Loans contain no financial
covenants and are not secured by any of our assets. The debt obligation is
$2.8 million, principal repayments are due as follows: $1.7 million are due in
2023, and the remaining $1.1 million are due upon final maturity in 2024.

Because the FFG Loans bear interest at below market rates we account for the
imputed benefit arising from the difference between an estimated market rate of
interest and the contractual interest rate as grant funding from FFG, which is
included in grant income. On the date that FFG Loan proceeds are received, we
recognize the portion of the loan proceeds allocated to grant funding as a
discount to the carrying value of the loan and as unearned income. As of
June 30, 2022, the unamortized debt discount related to FFG Loans was
$0.6 million.

We entered into arrangements with contract manufacturing organizations. As of
June 30, 2022, we had total non-cancellable obligations under such contracts of
$8.5 million.

We do not expect positive cash flows from operations in the foreseeable future,
if at all. Historically, we have incurred operating losses as a result of
ongoing efforts to develop our arenavirus technology platform and our product
candidates, including conducting ongoing research and development, preclinical
studies, clinical trials, providing general and administrative support for these
operations and developing our intellectual property portfolio. We expect to
continue to incur net operating losses for at least the next several years as we
progress clinical development, seek regulatory approval, prepare for and, if
approved, proceed to commercialization of our most advanced oncology product
candidate HB-200, continue our research and development efforts relating to our
other and future product candidates, and invest in our manufacturing
capabilities and our own manufacturing facility.

Future Funding Requirements


We have no products approved for commercial sale. To date, we have devoted
substantially all of our resources to organizing and staffing our company,
business planning, raising capital, undertaking preclinical studies and clinical
trials of our product candidates. As a result, we are not profitable and have
incurred losses in each period since our

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inception in 2011. As of June 30, 2022, we had an accumulated deficit of $257.1 million. We expect to continue to incur significant losses for the foreseeable future. We anticipate that our expenses will increase substantially as we:

? pursue the clinical and preclinical development of our current and future

product candidates;

? leverage our technologies to advance product candidates into preclinical and

clinical development;

? seek regulatory approvals for product candidates that successfully complete

clinical trials, if any;

? attract, hire and retain additional clinical, quality control and scientific

personnel;

establish our manufacturing capabilities through third parties or by ourselves

? and scale-up manufacturing to provide adequate supply for clinical trials and

commercialization;

expand our operational, financial and management systems and increase

? personnel, including personnel to support our clinical development,

manufacturing and commercialization efforts and our operations as a public

company;

? expand and protect our intellectual property portfolio;

establish a sales, marketing, medical affairs and distribution infrastructure

? to commercialize any products for which we may obtain marketing approval and

intend to commercialize on our own or jointly;

? acquire or in-license other product candidates and technologies; and

incur additional legal, accounting and other expenses in operating our

? business, including ongoing costs associated with operating as a public

company.




Even if we succeed in commercializing one or more of our product candidates, we
will continue to incur substantial research and development and other
expenditures to develop and market additional product candidates. We may
encounter unforeseen expenses, difficulties, complications, delays and other
unknown factors that may adversely affect our business. The size of our future
net losses will depend, in part, on the rate of future growth of our expenses
and our ability to generate revenue. Our prior losses and expected future losses
have had and will continue to have an adverse effect on our stockholders' equity
and working capital.

We will require substantial additional financing and a failure to obtain this necessary capital could force us to delay, limit, reduce or terminate our product development programs, commercialization efforts or other operations.


Since our inception, we have invested a significant portion of our efforts and
financial resources in research and development activities for our
non-replicating and replicating technologies and our product candidates derived
from these technologies. Preclinical studies and clinical trials and additional
research and development activities will require substantial funds to complete.
We believe that we will continue to expend substantial resources for the
foreseeable future in connection with the development of our current product
candidates and programs as well as any future product candidates we may choose
to pursue, as well as the gradual gaining of control over our required
manufacturing capabilities and other corporate uses. These expenditures will
include costs associated with conducting preclinical studies and clinical
trials, obtaining regulatory approvals, and manufacturing and supply, as well as
marketing and selling any products approved for sale. In addition, other
unanticipated costs may arise. Because the outcome of any preclinical study or
clinical trial is highly uncertain, we cannot reasonably estimate the actual
amounts necessary to successfully complete the development and commercialization
of our current or future product candidates.

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Our future capital requirements depend on many factors, including:

the scope, progress, results and costs of researching and developing our

? current and future product candidates and programs, and of conducting

preclinical studies and clinical trials;

the number and development requirements of other product candidates that we may

? pursue, and other indications for our current product candidates that we may

pursue;

the stability, scale and yields of our future manufacturing process as we

? scale-up production and formulation of our product candidates for later stages

of development and commercialization;

the timing of, and the costs involved in, obtaining regulatory and marketing

? approvals and developing our ability to establish sales and marketing

capabilities, if any, for our current and future product candidates we develop

if clinical trials are successful;

? the success of our collaboration with Gilead;

? our ability to establish and maintain collaborations, strategic licensing or

other arrangements and the financial terms of such agreements;

? the cost of commercialization activities for our current and future product

candidates that we may develop, whether alone or with a collaborator;

the costs involved in preparing, filing, prosecuting, maintaining, expanding,

? defending and enforcing patent claims, including litigation costs and the

outcome of such litigation;

? the timing, receipt and amount of sales of, or royalties on, our future

products, if any; and

? the emergence of competing oncology and infectious disease therapies and other

adverse market developments.


A change in the outcome of any of these or other variables with respect to the
development of any of our current and future product candidates could
significantly change the costs and timing associated with the development of
that product candidate. Furthermore, our operating plans may change in the
future, and we will need additional funds to meet operational needs and capital
requirements associated with such operating plans.

We do not have any committed external source of funds or other support for our
development efforts. Until we can generate sufficient product and royalty
revenue to finance our cash requirements, which we may never do, we expect to
finance our future cash needs through a combination of public or private equity
offerings, debt financings, collaborations, strategic alliances, licensing
arrangements and other marketing or distribution arrangements as well as grant
funding. Based on our research and development plans, we expect that our
existing cash and cash equivalents, will enable us to fund our operating
expenses and capital expenditure requirements for at least the next 12 months.
These estimates are based on assumptions that may prove to be wrong, and we
could utilize our available capital resources sooner than we expect.

If we raise additional capital through marketing and distribution arrangements
or other collaborations, strategic alliances or licensing arrangements with
third parties, we may have to relinquish certain valuable rights to our product
candidates, technologies, future revenue streams or research programs or grant
licenses on terms that may not be favorable to us. If we raise additional
capital through public or private equity offerings, the terms of these
securities may include liquidation or other preferences that adversely affect
our stockholders' rights. Further, to the extent that we raise additional
capital through the sale of common stock or securities convertible or
exchangeable into common stock, the ownership interest of our shareholders will
be diluted. If we raise additional capital through debt financing, we would be
subject to fixed payment obligations and may be subject to covenants limiting or
restricting our ability to take specific actions, such as incurring additional
debt, making capital expenditures or declaring dividends. If we are unable

to
obtain

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additional funding on favorable terms when needed, we may have to delay, reduce
the scope of or terminate one or more of our research and development programs
or clinical trials.

Cash Flows

The following table sets forth a summary of the primary sources and uses of cash
(in thousands):

                                                        Six months ended June 30,
                                                           2022             2021

Net cash used in operating activities                 $     (16,626)     $ 

(35,129)


Net cash used in investing activities                        (3,460)       

(4,954)


Net cash provided by financing activities                     72,340       

186

Net increase (decrease) in cash and cash equivalents 52,254 (39,897)

Cash Used in Operating Activities



During the six months ended June 30, 2022, cash used in operating activities was
$16.6 million, which consisted of a net loss of $34.3 million, adjusted by
non-cash charges of $5.1 million and cash provided due to changes in our
operating assets and liabilities of $12.6 million. The non-cash charges
consisted primarily of stock-based compensation of $3.0 million, depreciation
and amortization expense of $1.9 million and other non-cash items of
$0.2 million. The change in our operating assets and liabilities was primarily
due an increase in deferred revenues of $12.2 million, resulting from the
receipt of the $15.0 million program initiation payment, a decrease in accounts
receivable of $5.3 million, resulting from the collection of cost reimbursements
from Gilead, a decrease in prepaid expenses and other current assets of
$0.5 million, an increase in other current liabilities of $0.3 million, an
increase in other non-current liabilities of $0.2 million, and a decrease in
other non-current assets of $0.2 million, partially offset by an increase in
receivable research incentives of $3.4 million, a decrease in accounts payable
of $1.8 million, and a decrease in operating lease liabilities of $0.9 million.

During the six months ended June 30, 2021, cash used in operating activities was
$35.1 million, which consisted of a net loss of $34.4 million, adjusted by
non-cash charges of $6.5 million and cash used due to changes in our operating
assets and liabilities of $7.2 million. The non-cash charges consisted primarily
of stock-based compensation of $4.1 million and depreciation and amortization
expense of $2.4 million. The change in our operating assets and liabilities was
primarily due to an increase in prepaid expenses and other current assets of
$12.3 million, a decrease in other non-current liabilities of $2.2 million, a
decrease in deferred revenues of $1.4 million, an increase in receivable
research incentives of $1.4 million, a decrease in operating lease liabilities
of $1.0 million, and an increase in other non-current assets of $0.9 million,
partially offset by an increase in accrued expenses and other liabilities of
$11.0 million, an increase in accounts payable of $0.5 million, and a decrease
in accounts receivable of $0.5 million.

Cash Used in Investing Activities



During the six months ended June 30, 2022, cash used in investing activities was
$3.5 million. The decrease of $1.5 million compared to the six months ended
June 30, 2021 resulted from lower capital expenditures in connection with our
GMP manufacturing facility project and lower expenditures for purchase of
equipment.

During the six months ended June 30, 2021, cash used in investing activities was
$5.0 million and resulted primarily from capital expenditures in connection with
our GMP manufacturing facility project as well as expenditures for laboratory
and office space extension and purchase of equipment.

Cash Provided by Financing Activities



During the six months ended June 30, 2022, cash provided by financing activities
was $72.3 million and consisted mainly of net proceeds of $70.2 million from our
follow-on public offering in March 2022 and of net proceeds of $5.0 million from
Gilead's purchase of 1,666,666 shares of our common stock in February 2022.

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During the six months ended June 30, 2021, cash provided by financing activities
was $0.2 million and consisted primarily from the payment of exercise prices of
stock options.

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
we have prepared in accordance with the rules and regulations of the SEC, and
generally accepted accounting principles in the United States, or GAAP. The
preparation of these condensed consolidated financial statements requires us to
make estimates and assumptions that affect the reported amounts of assets and
liabilities and the disclosure of contingent assets and liabilities at the date
of the financial statements, as well as the reported expenses during the
reporting periods. We evaluate our estimates and judgments on an ongoing basis.
We base our estimates on historical experience and on various other factors that
we believe are reasonable under the circumstances, the results of which form the
basis for making judgments about the carrying value of assets and liabilities
that are not readily apparent from other sources. Our actual results may differ
from these estimates under different assumptions or conditions.

Our critical accounting policies and the methodologies and assumptions we apply
under them have not materially changed, as compared to those disclosed in
"Management's Discussion and Analysis of Financial Condition and Results of
Operations - Critical Accounting Policies" in our Annual Report on Form 10-K for
the year ended December 31, 2021 filed with the SEC on March 24, 2022.

Recently Issued Accounting Pronouncements



A description of recently issued accounting pronouncements that may potentially
impact our financial position and results of operations is disclosed in Note 2
to our condensed consolidated financial statements appearing in this Form 10-Q.

Emerging Growth Company Status and Smaller Reporting Company


As an "emerging growth company," the Jumpstart Our Business Startups Act of 2012
allows us to delay adoption of new or revised accounting standards applicable to
public companies until such standards are made applicable to private companies.
However, we have irrevocably elected not to avail ourselves of this extended
transition period for complying with new or revised accounting standards and,
therefore, we will be subject to the same new or revised accounting standards as
other public companies that are not emerging growth companies.

We are also a "smaller reporting company" meaning that the market value of our
stock held by non-affiliates is less than $700 million and our annual revenue
was less than $100 million during our most recently completed fiscal year. We
may continue to be a smaller reporting company if either (i) the market value of
our stock held by non-affiliates is less than $250 million or (ii) our annual
revenue was less than $100 million during the most recently completed fiscal
year and the market value of our stock held by non-affiliates is less than $700
million. If we are a smaller reporting company at the time we cease to be an
emerging growth company, we may continue to rely on exemptions from certain
disclosure requirements that are available to smaller reporting companies. For
so long as we remain a smaller reporting company, we are permitted and intend to
rely on exemptions from certain disclosure and other requirements that are
applicable to other public companies that are not smaller reporting companies.

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