The following discussion and analysis of our financial condition and results of
operations should be read in conjunction with our Annual Report on Form 10-K for
the year ended December 31, 2021, filed with the SEC on March 24, 2022, or our
Annual Report, as well as our unaudited condensed financial statements and
related notes included in this Quarterly Report on Form 10-Q, or this Quarterly
Report.

Forward-Looking Statements

This report contains forward-looking statements and information within the
meaning of Section 27A of the Securities Act of 1933, as amended, or the
Securities Act, and Section 21E of the Securities Exchange Act of 1934, as
amended, or the Exchange Act, which are subject to the "safe harbor" created by
those sections. These forward-looking statements include, but are not limited
to, statements concerning our strategy, future operations, future financial
position, future revenues, projected costs, prospects and plans and objectives
of management. The words "anticipate," "believe," "could," "designed,"
"estimate," "expect," "intend," "may," "plan," "potential," "project," "will,"
"would," and similar expressions are intended to identify forward-looking
statements, although not all forward-looking statements contain these
identifying words. We may not actually achieve the plans, intentions or
expectations disclosed in our forward-looking statements and you should not
place undue reliance on our forward-looking statements. Actual results or events
could differ materially from the plans, intentions and expectations disclosed in
the forward-looking statements that we make. These forward-looking statements
involve risks and uncertainties that could cause our actual results to differ
materially from those in the forward-looking statements, including, without
limitation, the risks set forth in Part II, Item 1A, "Risk Factors" in this
Quarterly Report on Form 10-Q, Part I, Item 1A, "Risk Factors" in our Annual
Report and in our other filings with the SEC. The forward-looking statements are
applicable only as of the date on which they are made, and we do not assume any
obligation to update any forward-looking statements.

Overview



We are a clinical stage biopharmaceutical company focused on discovering and
developing novel, controllable cellular immunotherapies for various forms of
cancer, including both hematological cancers and solid tumors. We are advancing
CAR-T cell therapies which are an innovative approach in which a patient's or
donor's T cells are genetically modified to carry chimeric antigen receptors, or
CARs. We are using our proprietary Chemical Induction of Dimerization, or CID,
technology platform to engineer our product candidates with switch technologies
that are designed to control components of the immune system in real time. By
incorporating our CID platform, our product candidates may offer better efficacy
and safety outcomes than are seen with current cellular immunotherapies.

Cell behavior is controlled by cascades of specialized signaling proteins. CID
consists of molecular switches, modified forms of these signaling proteins,
which are triggered inside the patient by infusion of a small molecule, instead
of by natural upstream signals. We genetically introduce these molecular
switches into the appropriate immune cells and deliver the cells to the patient
in the manner of conventional cellular immunotherapy. We have developed two such
switches: an "activation switch," designed to stimulate activation,
proliferation and persistence of the immunotherapy cells and provide other
immunomodulatory benefits, and a "safety switch," designed to initiate
programmed cell death, or apoptosis, of the immunotherapy cells. Each of our
product candidates incorporates one or both switches, for enhanced, real time
control of efficacy and safety:

•The inducible MyD88/CD40 (iMC) activation switch that is incorporated into our
GoCAR product candidates is designed to enhance CAR-based cell therapies by
augmenting multiple mechanisms of action, including: 1) boosting effector cell
proliferation; 2) enhancing functional persistence by resisting exhaustion and
inhibitory signals found in the tumor microenvironment; and 3) stimulating the
cancer patient's own immune system to intensify tumor killing. Unlike other CAR
therapies that can behave unpredictably due to their autonomous activity, GoCAR
antitumor effects are controlled through scheduled administration of rimiducid.
In the event of severe side effects, GoCAR activity can be attenuated by
extending the interval between rimiducid doses or suspending further rimiducid
administration.

•Our CaspaCIDe™ safety switch (also known as inducible Caspase-9, or iC9) is
designed to be inactive unless the patient experiences a serious side effect
(e.g., cytokine release syndrome, or CRS, neurologic toxicities or off-tumor /
on-target toxicities). In that event, rimiducid or temsirolimus is administered
to induce Caspase-9 and eliminate the cells, with the goal of attenuating the
therapy and resolving the serious side effect.

•Some of our product candidates are "dual-switch" GoCARs that are designed to
provide a user-controlled system for managing proliferation, persistence and
safety of tumor antigen-specific CAR cells by incorporating both our iMC and
CaspaCIDe switches. We also have an active research effort to further develop
and enhance these molecular switch approaches.
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By incorporating our novel switch technologies, we are developing product candidates with the potential to elicit positive clinical outcomes and ultimately change the treatment paradigm in various areas of cellular immunotherapy. Our most advanced programs are described below.



•BPX-601 is an autologous GoCAR-T product candidate containing our proprietary
iMC activation switch, designed to treat solid tumors expressing prostate stem
cell antigen, or PSCA. We believe iMC enhances T cell proliferation and
persistence, enhances host immune activity, and modulates the tumor
microenvironment to improve the potential to treat solid tumors compared to
traditional CAR-T therapies. A Phase 1/2 clinical trial called BP-012 in
patients with metastatic castration-resistant prostate cancer and metastatic
pancreatic cancer expressing PSCA is ongoing.

•BPX-603 is an autologous dual-switch GoCAR-T product candidate containing both
the iMC activation and CaspaCIDe safety switches. BPX-603 is our first
dual-switch GoCAR-T product candidate and is designed to target solid tumors
that express the human epidermal growth factor receptor 2 antigen, or HER2. A
Phase 1/2 clinical trial, called BPX603-201A, in patients with metastatic HER2+
solid tumors is ongoing.

We have developed efficient and scalable processes to manufacture genetically
modified T cells of high quality, which are currently being used to generate
products for our clinical trials. We are leveraging this know how in combination
with our proprietary cellular control technologies, resources, capabilities and
expertise for the manufacture of CAR-T product candidates to create and develop
first and best-in-class product candidates.

Impact of COVID-19



We have experienced limited impact to date, and do not anticipate experiencing a
substantial impact in the future to our operations as a result of the ongoing
COVID-19 pandemic. However, depending the duration and severity of the pandemic,
we could experience impact in the future, including with respect to the
operations of our manufacturing partners, clinical trial sites and regulatory
agencies, all of which we are substantially dependent upon for our business. In
particular, as we seek to pursue clinical trial enrollment and site activation
for BPX-601 and BPX-603, it is possible that we may experience challenges in
site enrollment due to factors related to the COVID-19 pandemic. For example,
over the past three quarters, we experienced delays related to COVID-19 in
patient screening and enrollment and site activation activities, delaying
anticipated data presentations from our studies from 2022 to the first half of
2023. We are continuing to closely monitor the impact and potential future of
the COVID-19 pandemic on our business.

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Results of Operations



The following table sets forth a summary of our statement of operations for the
periods indicated:

                                        Three Months Ended                                                 Six Months Ended
(in thousands)                 June 30, 2022           June 30, 2021           Change            June 30, 2022           June 30, 2021           Change
Revenues
Supply agreement             $            -          $          700          $   (700)         $            -          $          700          $   (700)
Revenues                                  -                     700              (700)                      -                     700              (700)
Operating expenses:
Research and development              5,089                   6,722            (1,633)                  9,575                  13,183            

(3,608)


General and administrative            1,448                   1,765              (317)                  2,901                   3,777              

(876)


Total operating expenses              6,537                   8,487            (1,950)                 12,476                  16,960            (4,484)
Other operating expense:
Loss on dispositions, net                 -                       -                 -                       -                     464              (464)
Loss from operations                 (6,537)                 (7,787)       

    1,250                 (12,476)                (16,724)            4,248

Other income (expense):
Interest income                          13                       8                 5                      27                      18                 9
Interest expense                          -                      (1)                1                       -                      (4)                4
Change in fair value of
warrant derivative and
private placement option
liabilities                           2,523                   5,579            (3,056)                    886                   3,242            (2,356)
Other expense                             -                      (1)                1                       -                      (1)                1
Total other income                    2,536                   5,585            (3,049)                    913                   3,255            (2,342)
Net loss                     $       (4,001)         $       (2,202)         $ (1,799)         $      (11,563)         $      (13,469)         $  1,906


Revenues

The decrease in revenues for the three and six months ended June 30, 2022,
compared to the same periods last year, was due to the inactivity of a supply
agreement executed with Takeda Development Center Americas, Inc. (Takeda) in
2021. In the first quarter of 2021, we entered into a multi-year supply
agreement for the supply of rimiducid for potential use in clinical trials of
TAK-007 (CD19 CAR-NK cell therapy). The supply was fulfilled in the second
quarter of 2021 generating revenue of $0.7 million. There was no rimiducid
ordered or supplied during the first two quarters of 2022.

Research and Development Expenses (R&D)



The decrease in R&D expenses for the three and six months ended June 30, 2022,
compared to the same periods last year, was primarily due to continued reduction
of expenses related to rivo-cel activities and patient enrollment delays in our
clinical trials. We discontinued active efforts to identify a partner for
rivo-cel in late 2021. As a result, we have further decreased the budget on
rivo-cel by limiting activities to maintaining regulatory compliance and
long-term follow-up and monitoring of patients previously enrolled in rivo-cel
clinical trials, leading to a reduction in clinical research and pharmaceutical
development expenses of $1.0 million and $2.6 million for the three and six
months ended June 30, 2022, respectively, compared to the same periods last
year. Additionally, there have been delays in enrolling new patients for our
clinical trials, which resulted in a reduction in clinical research costs of
$1.1 million and $1.5 million for the three and six months ended June 30, 2022,
respectively, compared to the same periods last year. These decreases were
partially offset by an increase in salaries, benefits, travel, depreciation and
share-based compensation related charges of $0.5 million for the three and six
months ended June 30, 2022, respectively, as a result of increased R&D personnel
hired during the second quarter of 2022.

General and Administrative Expenses (G&A)



The decrease in G&A expenses for the three months ended June 30, 2022, compared
to the same period last year, was primarily due to the reduced share-based
compensation expenses and depreciation expenses by $0.3 million. The decreased
share-based
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compensation expenses is a result of expirations of stock options along with lower cost of new stock option grants driven by a lower average stock price.



The decrease in G&A expenses for the six months ended June 30, 2022, compared to
the same period last year, was primarily due to the reduced personnel and
share-based compensation expenses by $0.6 million, as a result of reduced
headcount, along with the expirations of stock options and lower cost of new
stock grants. Furthermore, our exit from the Houston and South San Francisco
office facilities resulted in a combined reduction of $0.3 million in facility
charges, depreciation expenses, and business property tax.

Loss on dispositions, net



For the three and six months ended June 30, 2022, we did not incur any gain or
loss on dispositions. The loss recognized for the six months ended June 30, 2021
was due to the lease termination of the South San Francisco office space. Upon
the termination and exit of the office space, we disposed of substantially all
of the assets and liabilities associated with the lease including a right-of-use
asset of $0.6 million, leased equipment with net book value less than
$0.1 million, and the related lease liability of $1.0 million. A loss on
termination of $0.5 million was recognized for the six months ended June 30,
2021.

Other Income (Expense)

Other expense primarily consists of interest income and interest expense, offset
by changes in fair value of our warrant derivative liability, which is
remeasured at each reporting period. Due to the nature of the inputs in the
model used to assess the fair value of the warrant derivative liability, the
Company may experience significant fluctuations at each reporting period. These
fluctuations may be due to a variety of factors, including changes in our stock
price and changes in stock price volatility over the remaining term of the
warrants.

The decrease in other income for the three and six months ended June 30, 2022,
compared to the same periods last year, was primarily due to decreased gains
from the changes in fair value of our warrant liability of $3.1 million and $2.4
million, respectively. The smaller gains in the three and six months ended June
30, 2022, resulted from a less significant drop in the stock price and
volatility, compared to the same periods last year.

Liquidity and Capital Resources

Going Concern and Management's Plans



The accompanying consolidated financial statements have been prepared on the
basis that we will continue as a going concern, which contemplates realization
of assets and the satisfaction of liabilities in the normal course of business.
As of June 30, 2022, we had cash and cash equivalents of $33.2 million,
restricted cash of $1.5 million, and net cash used in operations of
approximately $13.0 million for the six months ended June 30, 2022.

Our cash resources are primarily consumed by operating activities and we expect
negative cash flows from operations to continue for at least the next 12 months.
We do not have any material contractual obligations or commitments as of June
30, 2022. Our primary uses of capital are, and we expect will continue to be,
compensation and related expenses, third-party clinical research and development
services, clinical costs, legal and other regulatory expenses, and general
overhead costs. Based on our current research and development plans and our
timing expectations related to the progress of our programs, we believe there is
substantial doubt that our cash and cash equivalents will be sufficient to fund
our operating expenses and capital expenditure requirements through the next
twelve months from the date the accompanying consolidated financial statements
are issued.

We plan to continue attempting to obtain future financing and/or engage in
strategic transactions, but given the dynamic nature of our business, the
COVID-19 pandemic and the macro-economic environment, including volatile equity
markets, ongoing supply chain disruptions, inflation, and rising interest rates,
we cannot predict with certainty the outcome of our actions to generate
liquidity, including the availability of additional equity or debt financing, or
whether such actions would generate the expected liquidity as currently planned.
To continue as a going concern, we may postpone or eliminate some of our
research and development programs and reduce our administrative costs. We may
also intend to seek additional funding including, but not limited to any or all
of the following potential sources:

We have an effective shelf registration statement on Form S-3 for the offer and
sale of up to $200.0 million of our securities, of which approximately $90.5
million remains available for future offerings. We may pursue additional funding
through the sale of our securities in one or more offerings under this
registration statement; however, we cannot assure you that we will be able to do
so on favorable terms. Our ability to offer and sell our securities in a primary
offering on our Form S-3 is currently limited by Instruction I.B.6 of Form S-3,
commonly referred to as the
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"baby shelf" limitation. If we raise additional capital through the sale of
equity or convertible debt securities, the ownership interests of our
stockholders will be diluted, and the terms may include liquidation or other
preferences that could adversely affect the rights of our existing stockholders.
If we raise additional capital through the issuance of debt securities, we could
incur fixed payment obligations and become subject to certain restrictive
covenants, including limitations on our ability to incur additional debt and
acquire or license intellectual property rights, and other operating
restrictions that could restrict our ability to conduct our business.

In addition, we may receive additional capital through the exercise of
outstanding warrants to purchase our stock if our stock price sufficiently
increases. As of June 30, 2022, warrants to purchase 5,750,000 shares of our
Series 1 preferred stock at an exercise price of $130.00 per share (equivalent
to $13.00 per share of common stock), warrants to purchase 4,149,378 shares of
our common stock at an exercise price of $6.50 per share and warrants to
purchase 2,055,920 shares of our common stock at an exercise price of $1.69 per
share were outstanding. The preferred stock warrants expire on August 21, 2026,
and the common warrants expire on November 3, 2025, and December 7, 2028,
respectively.

As a result of the COVID-19 pandemic, global inflation and the ongoing military
conflict between Russian and Ukraine, the global credit and financial markets
have experienced extreme volatility, including diminished liquidity and credit
availability, declines in consumer confidence, declines in economic growth,
increases in unemployment rates and uncertainty about economic stability.
Further deterioration in credit and financial markets and confidence in economic
conditions could occur. If equity and credit markets deteriorate, it may make
any necessary debt or equity financing more difficult to obtain, more costly
and/or more dilutive. Moreover, if we do not obtain such additional funds, there
could be substantial doubt about our ability to continue as a going concern and
increased risk of insolvency, which could result in a total loss of investment
to our stockholders and other security holders.

Cash Flows

Operating Activities



Net cash used in operating activities during the quarter ended June 30, 2022,
was $13.0 million compared to $16.1 million for the same period last year. The
primary operating activities during the six months ended June 30, 2022, were (1)
$11.6 million of net losses, (2) a non-cash gain of $0.9 million recognized from
the change in the fair value of the warrant derivative liability and (3) $1.7
million decrease from changes in operating assets and liabilities. These
activities were partially offset by the $1.2 million share-based compensation
expenses.

Investing Activities

Net cash used in investing activities during the quarter ended June 30, 2022,
was less than $0.1 million compared to net cash provided by investing activities
of less than $0.9 million for the same period last year. The cash used in
investing activities during the six months ended June 30, 2022, was primarily
for the purchase of computer equipment.

Financing Activities



There was no cash used in or provided by financing activities during the quarter
ended June 30, 2022, compared to net cash used in financing activities of less
than $0.1 million for the same period last year primarily due to payment on
financing lease obligations.

As of June 30, 2022, we do not have any short-term or long-term lease liabilities, debt obligations or other material capital commitments. The expected capital expenditures for the next 12 months are minimal.

Critical Accounting Policies and Estimates



There have been no material changes to the Company's critical accounting
policies and use of estimates from those disclosed in the Company's Form 10-K
for the year ended December 31, 2021. For a discussion of our critical
accounting policies and use of estimates, refer to Management's Discussion and
Analysis of Financial Condition and Results of Operations - Critical Accounting
Policies and Significant Estimates in Part II, Item 7 of our Annual Report on
Form 10-K for the year ended December 31, 2021.

Recent Accounting Pronouncements


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  Table of Contents
See Note 1 - Organization, Basis of Presentation, and Summary of Significant
Accounting Policies for discussion regarding recent accounting pronouncements.

Off-Balance Sheet Arrangements



During the periods presented, we did not have, and we do not currently have, any
off-balance sheet arrangements, as defined in the rules and regulations of the
Securities and Exchange Commissions.

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