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 the notes thereto included in Item 1 in
this Quarterly Report on Form 10-Q, or this Quarterly Report. The following
discussion should also be read in conjunction with our audited consolidated
financial statements and the notes thereto and "Management's Discussion and
Analysis of Financial Condition and Results of Operations" included in our
Annual Report on Form 10-K for the year ended December 31, 2019.

Unless otherwise provided in this Quarterly Report, references to the "Company,"
"we," "us," and "our" refer to Puma Biotechnology, Inc., a Delaware corporation,
together with its wholly owned subsidiaries.

Overview



We are a biopharmaceutical company with a focus on the development and
commercialization of innovative products to enhance cancer care. We in-license
from Pfizer, Inc., or Pfizer, the global development and commercialization
rights to PB272 (neratinib, oral), PB272 (neratinib, intravenous) and PB357.
Neratinib is a potent irreversible tyrosine kinase inhibitor, or TKI, that
blocks signal transduction through the human epidermal growth factor receptors,
HER1, HER2 and HER4. Currently, we are primarily focused on the development and
commercialization of the oral version of neratinib, and our most advanced drug
candidates are directed at the treatment of HER2-positive breast cancer and HER2
mutated cancers. We believe neratinib has clinical application in the treatment
of several other cancers as well, including other tumor types that over-express
or have a mutation in HER2 or EGFR, such as breast cancer, cervical cancer, lung
cancer or other solid tumors.



Prior to 2017, our efforts and resources had been focused primarily on acquiring
and developing our pharmaceutical technologies, raising capital and recruiting
personnel. In 2017, the U.S. Food and Drug Administration, or FDA, approved
NERLYNX, formally known as PB272 (neratinib, oral), for the extended adjuvant
treatment of adult patients with early stage HER2-overexpressed/amplified breast
cancer following adjuvant trastuzumab-based therapy. In February 2020, NERLYNX
was also approved by the FDA in combination with capecitabine for the treatment
of adult patients with advanced or metastatic HER2-positive breast cancer who
have received two or more prior anti-HER2-based regimens in the metastatic
setting. In 2018, the European Commission, or EC, granted marketing
authorization for NERLYNX in the European Union for the extended adjuvant
treatment of adult patients with early stage hormone receptor positive
HER2-overexpressed/amplified breast cancer and who are less than one year from
the completion of prior adjuvant trastuzumab-based therapy.



We have entered into exclusive sub-license agreements with various parties to
pursue regulatory approval, if necessary, and commercialize NERLYNX, if
approved, in numerous regions outside the United States, including Europe
(excluding Russia and Ukraine), Canada, China, Southeast Asia, Israel, Mexico,
South Korea, and various countries and territories in Central and South America.
We plan to continue to pursue commercialization of NERLYNX in other countries
outside the United States, if approved.

Our expenses to date have been related to hiring staff, commencing
company-sponsored clinical trials and the build out of our corporate
infrastructure and, since 2017, the commercial launch of NERLYNX. To date, our
major sources of working capital have been proceeds from product and license
revenue, public offerings of our common stock, proceeds from our credit facility
and sales of our common stock in private placements.

Impact of COVID-19



Our priorities during the COVID-19 pandemic are protecting the health and safety
of our employees while continuing our mission to develop and commercialize
innovative products to enhance cancer care. Substantially all geographic regions
in which our U.S. sales force operates have imposed, and those regions or other
regions in which our sales force operates may in the future impose,
"shelter-in-place" orders, quarantines or similar orders or restrictions to
control the spread of COVID-19. These types of restrictions may deter or prevent
cancer patients from traveling to see their doctors and result in a decline in
revenue for NERLYNX, our only commercial product. Additionally, our commercial
team and sales force have limited travel and personal interactions with
physicians and customers, including visits to healthcare provider offices due to
limitations that have been imposed at certain hospitals and medical facilities,
and are currently conducting a large percentage of promotional activities
virtually. These types of restrictions have adversely impacted our ability to
engage with our customers and have adversely impacted sales of NERLYNX, our only
commercial product, and they may continue to do so. The respective commercial
teams of certain of the companies to which we sub-license the commercial rights
to NERLYNX, and on which we rely for our international sales, have chosen or
have been forced to take similar action, and other sub-licensees of NERLYNX may
choose or be forced to take similar action. Furthermore, the COVID-19 pandemic
has resulted in dramatic increases in unemployment rates, which may result in a
substantial number of people becoming uninsured or underinsured. Any of these
developments may have an adverse effect on our revenue. We have observed
disruptions in patient enrollments in the United States and in our SUMMIT basket
trial. If the COVID-19 pandemic continues to spread in the geographies in which
we are conducting clinical trials, we may experience additional disruptions in
those clinical trials, which could have a material adverse impact on our
clinical trial plans and timelines.

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Our ability to continue to operate without any significant negative impacts will
in part depend on the length and severity of the COVID-19 pandemic and our
ability to protect our employees and our supply chain. We continue to follow and
monitor recommended actions of government and health authorities to protect our
employees worldwide. For the nine months ended September 30, 2020, we and our
key third-party suppliers and manufacturers were able to broadly maintain
operations. We rely exclusively on third-party manufacturers to manufacture
NERLYNX.

We intend to satisfy our near-term liquidity requirements through a combination
of our existing cash and cash equivalents and marketable securities as of
September 30, 2020 and proceeds that will become available to us through product
sales, royalties and license milestone payments. However, this intention is
based on assumptions that may prove to be wrong. Changes may occur that would
consume our available capital faster than anticipated, including the length and
severity of the COVID-19 pandemic and measures taken to control the spread of
COVID-19, as well as changes in and progress of our development activities, the
impact of commercialization efforts, acquisitions of additional drug candidates
and changes in regulation. Any of these developments may have an adverse effect
on our revenue and thus our ability to satisfy the minimum revenue covenants in
our loan and security agreement.

Critical Accounting Policies



As of the date of the filing of this Quarterly Report, we believe there have
been no material changes to our critical accounting policies and estimates
during the three months and nine months ended September 30, 2020 from our
accounting policies at December 31, 2019, as reported in our Annual Report on
Form 10-K for the fiscal year ended December 31, 2019. We accounted for the
following related to sub-license agreements during the nine months ended
September 30, 2020:

License Revenue:



We recognize license revenue under certain of our sub-license agreements that
are within the scope of ASC 606. The terms of these agreements may contain
multiple performance obligations, which may include licenses and research and
development activities. We evaluate these agreements under ASC 606 to determine
the distinct performance obligations. Non-refundable, up-front fees that are not
contingent on any future performance and require no consequential continuing
involvement by us, are recognized as revenue when the license term commences and
the licensed data, technology or product is delivered. We defer recognition of
non-refundable upfront license fees if the performance obligations are not
satisfied.

Prior to recognizing revenue, we make estimates of the transaction price,
including variable consideration that is subject to a constraint. Amounts of
variable consideration are included in the transaction price to the extent that
it is probable that a significant reversal in the amount of cumulative revenue
recognized will not occur and when the uncertainty associated with the variable
consideration is subsequently resolved. Variable consideration may include
nonrefundable upfront license fees, payments for research and development
activities, reimbursement of certain third-party costs, payments based upon the
achievement of specified milestones, and royalty payments based on product sales
derived from the collaboration.

If there are multiple distinct performance obligations, we allocate the
transaction price to each distinct performance obligation based on its relative
standalone selling price. The standalone selling price is generally determined
based on the prices charged to customers or using expected cost-plus margin.
Revenue is recognized by measuring the progress toward complete satisfaction of
the performance obligations.


Summary of Income and Expenses

Product revenue, net:



Product revenue, net consists of revenue from sales of NERLYNX. We sell NERLYNX
to a limited number of specialty pharmacies and specialty distributors in the
United States. We record revenue at the net sales price, which includes an
estimate for variable consideration for which reserves are established. Variable
consideration consists of trade discounts and allowances, product returns,
provider chargebacks and discounts, government rebates and other incentives.

License revenue:

License revenue consists of consideration earned for performance obligations satisfied pursuant to our license agreements.

Royalty revenue:

Royalty revenue consists of consideration earned related to product sales made by our licensees in their respective territories pursuant to our license agreements.


                                       29

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Cost of sales:



Cost of sales consists of third-party manufacturing costs, freight, and indirect
overhead costs associated with sales of NERLYNX. Cost of sales also includes
period costs related to royalty charges payable to Pfizer, the amortization of
milestone payments made to Pfizer, certain inventory manufacturing services,
inventory adjustment charges, unabsorbed manufacturing and overhead costs, and
manufacturing variances.

Selling, general and administration expenses:

Selling, general and administrative expenses, or SG&A Expenses, consist primarily of salaries and payroll-related costs, stock-based compensation expense, professional fees, business insurance, rent, general legal activities, and other corporate expenses. We expense SG&A Expenses as they are incurred.

Research and development expenses:



Research and development expenses, or R&D Expenses, include costs associated
with services provided by consultants who conduct clinical services on our
behalf, contract organizations for the manufacturing of clinical materials and
clinical trials. During the three and nine months ended September 30, 2020 and
2019, our R&D Expenses consisted primarily of clinical research organization, or
CRO, fees; fees paid to consultants; salaries and related personnel costs; and
stock-based compensation. We expense our R&D Expenses as they are incurred.
Internal R&D Expenses primarily consist of payroll-related costs, and also
include equipment costs, travel expenses and supplies.

Results of Operations

Three Months Ended September 30, 2020 Compared to Three Months Ended September 30, 2019



Total revenue:

For the three months ended September 30, 2020, total revenue was approximately
$50.8 million, compared to $56.4 million for the three months ended September
30, 2019.

Product revenue, net:

Product revenue, net was approximately $49.3 million for the three months ended
September 30, 2020, compared to $53.5 million for the three months ended
September 30, 2019. The decrease in product revenue, net was attributable to a
volume decrease of approximately 23% in bottles of NERLYNX sold, and an increase
in reserves for variable consideration from approximately 12% of product revenue
for the three months ended September 30, 2019 to approximately 16% of product
revenue for the three months ended September 30, 2020. The increase in reserves
for variable consideration is primarily due to an increase in government rebates
as a percentage of gross revenue. The decrease in product revenue, net was
partially offset by an approximately 10% increase in gross selling price that
occurred in the first quarter of 2020 and again in the third quarter of 2020.

License revenue:

There was no license revenue for the three months ended September 30, 2020, compared to $2.8 million for the three months ended September 30, 2019.

Royalty revenue:



Royalty revenue was $1.4 million for the three months ended September 30, 2020,
compared to $0.1 million for the three months ended September 30, 2019. The
increase was due to increased product sales by our sub-licensees as they began
to commercialize NERLYNX in additional territories.

Cost of sales:



Cost of sales was approximately $9.9 million for the three months ended
September 30, 2020, compared to $9.4 million for the three months ended
September 30, 2019. The increase in cost of sales was primarily attributable to
an increase in the amortization of the milestone payments made to Pfizer and
increased royalty expense due to Pfizer related to the increase in royalty
revenue, which was partially offset by decreased royalty expenses due to Pfizer
related to the decrease in product revenue, net.

                                       30

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Selling, general and administrative expenses:



For the three months ended September 30, 2020, SG&A Expenses were approximately
$29.6 million, compared to approximately $31.4 million for the three months
ended September 30, 2019. SG&A Expenses for the three months ended September 30,
2020 and 2019 were as follows:



Selling, general, and
administrative expenses              For the Three Months Ended                    Change
(in thousands)                              September 30,                    $                %
                                      2020                2019           2020/2019        2020/2019
Payroll and related costs         $      10,274       $       9,586     $        688              7.2 %
Professional fees and expenses           11,271              10,526              745              7.1 %
Travel and meetings                       1,090               2,964           (1,874 )          -63.2 %
Facilities and equipment costs            1,412               1,439              (27 )           -1.9 %
Stock-based compensation                  4,101               5,600           (1,499 )          -26.8 %
Other                                     1,450               1,287              163             12.7 %
                                  $      29,598       $      31,402     $     (1,804 )           -5.7 %



For the three months ended September 30, 2020, SG&A Expenses decreased by approximately $1.8 million compared to the same period in 2019, primarily attributable to the following:



      •  a decrease in stock-based compensation expense of approximately $1.5
         million primarily due to a decrease of approximately $1.6 million for

stock awards that have fully vested and a decrease of approximately $1.4

million from stock awards forfeited, partially offset by an increase of


         approximately $1.5 million from new grants; and




      •  a decrease in travel and meetings of approximately $1.9 million related

         to travel restrictions due to the COVID-19 pandemic.



These decreases were partially offset by





      •  an increase in professional fees and expenses of approximately $0.7
         million, consisting of an increase of $0.3 million related to higher
         insurance premiums, an increase of approximately $0.5 million in legal

related expenses and an increase of $0.2 million in audit and board of


         directors costs, partially offset by a decrease of approximately $0.1
         million in connection with consultants and contractors and other
         immaterial fluctuations; and




  • an increase in payroll and related cost of $0.7 million.




Research and development expenses:



For the three months ended September 30, 2020, R&D Expenses were approximately
$23.3 million, compared to approximately $30.0 million for the three months
ended September 30, 2019. R&D Expenses for the three months ended September 30,
2020 and 2019 were as follows:



Research and development expenses For the Three Months Ended


         Change
(in thousands)                                September 30,                    $                %
                                        2020                2019           2020/2019        2020/2019
Clinical trial expense              $       8,257       $      11,251     $     (2,994 )          -26.6 %
Internal R&D                                9,441               9,512              (71 )           -0.7 %
Consultant and contractors                  2,183               2,651             (468 )          -17.7 %
Stock-based compensation                    3,463               6,613           (3,150 )          -47.6 %
                                    $      23,344       $      30,027     $     (6,683 )          -22.3 %



For the three months ended September 30, 2020, R&D Expenses decreased approximately $6.7 million compared to the same period in 2019, primarily attributable to the following:

• a decrease in clinical trial expense of approximately $3.0 million,

primarily due to the close out of two clinical trials and lower CRO site


         visits and related expenses due to actions taken in response to the
         COVID-19 pandemic;




      •  a decrease in stock-based compensation expense of approximately $3.2
         million, primarily due to a decrease of approximately $1.9 million for
         stock awards that fully vested and a decrease of approximately $1.6

million from stock award forfeitures, partially offset by an increase of


         approximately $0.3 million from new grants; and




      •  a decrease in consultant and contractor expense of approximately $0.5
         million, primarily due to the close out of certain clinical trials and
         lower staffing needs.




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Other income (expenses):



Other income (expenses)       For the Three Months Ended                   Change
(in thousands)                      September 30,                    $               %
                               2020                2019          2020/2019       2020/2019
Interest income           $           22       $         569     $     (547 )         -96.1 %
Interest expense                  (3,627 )            (3,052 )         (575 )          18.8 %
Legal verdict expense            (15,855 )                 -        (15,855 )        -100.0 %
Other income                         128                  46             82           178.3 %
                          $      (19,332 )     $      (2,437 )   $  (16,895 )         693.3 %




Interest income:



For the three months ended September 30, 2020, interest income decreased
approximately $0.5 million for the three months ended September 30, 2020
compared to the same period in 2019. The decrease in interest income reflects
less cash invested in money market accounts and high-yield savings accounts in
2020 compared to 2019.



Interest expense:



For the three months ended September 30, 2020, we recognized approximately $3.6
million in interest expense, compared to $3.1 million of interest expense for
the three months ended September 30, 2019. The increase in interest expense was
primarily the result of the interest expense for the milestone payments being
paid to Pfizer in installments.



Legal verdict expense:



For the quarter ended September 30, 2020, we recognized $15.9 million in legal
verdict expense, which primarily represents an increase to our estimate of
potential amounts that may be owed to class action participants as a result of
the Hsu v. Puma Biotechnology, Inc. claims process. During the three months
ended September 30, 2020, we changed our estimate of the legal verdict expense
and the associated legal expense accrual for the Hsu lawsuit. Our previous
estimate was based on data and assumptions that were available at the time.
During the third and fourth quarter of 2020, we obtained additional data,
previously unavailable, from the claims report and amended claims report filed
with the Court. The claims report asserts $50.5 million in damages, which is
larger than the amount previously estimated. We intend to challenge these claims
and estimate that the damages could range from $24.8 million to $51.3 million.
As a result, we have increased our estimate of the legal accrual on a
prospective basis beginning in the third quarter of 2020 to $24.8 million,
resulting in the additional $15.7 million legal verdict expense. The total
amount of aggregate class-wide damages still remains uncertain and will be
ascertained only after an extensive claims challenge process and the exhaustion
of any appeals.


Nine Months Ended September 30, 2020 Compared to Nine Months Ended September 30, 2019



Total revenue:

For the nine months ended September 30, 2020, total revenue was approximately
$172.6 million, compared to $209.3 million for the nine months ended September
30, 2019.

Product revenue, net:

Product revenue, net was approximately $146.7 million for the nine months ended
September 30, 2020, compared to $152.9 million for the nine months ended
September 30, 2019. The decrease in product revenue, net was attributable to a
volume decrease of approximately 18% in bottles of NERLYNX sold, partially
offset by an approximately 10% increase in gross selling price that occurred in
the first quarter of 2020 and again in the third quarter of 2020.

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License revenue:



License revenue was approximately $22.7 million for the nine months ended
September 30, 2020, compared to $56.3 million for the nine months ended
September 30, 2019. The decrease in license revenue is primarily due to a
decrease in upfront payments and satisfaction of different performance-based
milestones related to sub-license agreements in the nine months ended September
30, 2020, compared to the nine months ended September 30, 2019.

Royalty revenue:



Royalty revenue was $3.1 million for the nine months ended September 30, 2020,
compared to $0.2 million for the nine months ended September 30, 2019. The
increase was due to increased product sales by our sub-licensees as they began
to commercialize NERLYNX in additional territories.

Cost of sales:



For the nine months ended September 30, 2020, cost of sales was approximately
$28.4 million compared to $26.7 million for the nine months ended September 30,
2019. The increase in cost of sales was primarily attributable to increased
royalty expense due to Pfizer related to the increase in royalty revenue and an
increase in the amortization of the milestone payments made to Pfizer, which was
partially offset by decreased royalty expenses due to Pfizer related to the
decrease in product revenue, net.

Selling, general and administrative expenses:



For the nine months ended September 30, 2020, SG&A Expenses were approximately
$89.9 million, compared to approximately $110.4 million for the nine months
ended September 30, 2019. SG&A Expenses for the nine months ended September 30,
2020 and 2019 were as follows:



Selling, general, and
administrative expenses               For the Nine Months Ended                    Change
(in thousands)                              September 30,                    $                %
                                      2020                2019           2020/2019        2020/2019
Payroll and related costs         $     31,658       $       31,409     $        249              0.8 %
Professional fees and expenses          32,252               39,218           (6,966 )          -17.8 %
Travel and meetings                      4,023                8,419           (4,396 )          -52.2 %
Facilities and equipment costs           4,276                4,378             (102 )           -2.3 %
Stock-based compensation                13,523               22,927           (9,404 )          -41.0 %
Other                                    4,150                4,084               66              1.6 %
                                  $     89,882       $      110,435     $    (20,553 )          -18.6 %



For the nine months ended September 30, 2020, SG&A Expenses decreased by approximately $20.6 million compared to the same period in 2019, primarily attributable to the following:







      •  a decrease in stock-based compensation expense of approximately $9.4
         million primarily due to a decrease of approximately $7.6 million for

stock awards that have fully vested and a decrease of approximately $5.5

million from stock awards forfeited and other immaterial fluctuations,


         partially offset by an increase of approximately $3.9 million from new
         grants;




      •  a decrease in professional fees and expenses of approximately $7.0

million, consisting primarily of decreases of approximately $7.5 million

in legal fees in connection with various lawsuits and approximately $0.6

million for professional fees, primarily related to decreased consultancy

efforts related to marketing and commercialization support, partially


         offset by an increase of approximately $0.8 million in insurance
         premiums, $0.3 million in audit and board of directors fees and other
         immaterial fluctuations; and




      •  a decrease in travel and meetings of approximately $4.4 million related
         to travel restrictions and cancellations of on-site events due to the
         COVID-19 pandemic.






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Research and development expenses:



For the nine months ended September 30, 2020, R&D Expenses were approximately
$73.5 million, compared to approximately $102.6 million for the nine months
ended September 30, 2019. R&D Expenses for the nine months ended September 30,
2020 and 2019 were as follows:



Research and development expenses For the Nine Months Ended


         Change
(in thousands)                                September 30,                    $                %
                                        2020                2019           2020/2019        2020/2019
Clinical trial expense              $     24,130       $       40,665     $    (16,535 )          -40.7 %
Internal R&D                              29,564               29,485               79              0.3 %
Consultant and contractors                 6,218                9,596           (3,378 )          -35.2 %
Stock-based compensation                  13,578               22,864           (9,286 )          -40.6 %
                                    $     73,490       $      102,610     $    (29,120 )          -28.4 %



For the nine months ended September 30, 2020, R&D Expenses decreased approximately $29.1 million compared to the same period in 2019, primarily attributable to the following:

• a decrease in clinical trial expense of approximately $16.6 million,


         primarily due to the close out of certain clinical trials;




      •  a decrease in stock-based compensation expense of approximately $9.3
         million primarily due to a decrease of approximately $6.4 million for
         stock awards that fully vested and a decrease of approximately $4.8

million from stock award forfeitures, partially offset by an increase of


         approximately $1.8 million from new grants and other immaterial
         fluctuations; and



• a decrease in consultant and contractors expenses of approximately $3.4


         million, primarily due to the close out of certain clinical trials.






Other income (expenses):



Other income (expenses)         For the Nine Months Ended                  Change
(in thousands)                        September 30,                   $               %
                                  2020               2019         2020/2019       2020/2019
Interest income               $         474       $    2,349     $    (1,875 )         -79.8 %
Interest expense                    (10,479 )        (11,943 )         1,464           -12.3 %
Legal verdict expense               (16,041 )        (16,350 )           309            -1.9 %
Loss on debt extinguishment               -           (8,103 )         8,103          -100.0 %
Other income                            298               31             267           861.3 %
                              $     (25,748 )     $  (34,016 )   $     8,268           -24.3 %




Interest income:



For the nine months ended September 30, 2020, we recognized approximately $0.5
million in interest income compared to approximately $2.3 million of interest
income for the nine months ended September 30, 2019. The decrease in interest
income reflects less cash invested in money market accounts and high-yield
savings accounts in 2020 compared to 2019.



Interest expense:



For the nine months ended September 30, 2020, we recognized approximately $10.5
million in interest expense, compared to $11.9 million of interest expense for
the nine months ended September 30, 2019. The decrease in interest expense was
primarily the result of having less borrowings outstanding in 2020 than in 2019.
The decrease was partially offset by an increase in interest expense for the
milestone payments being paid to Pfizer in installments.



                                       34

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Legal verdict expense:



For the nine months ended September 30, 2020, we recognized an additional $16.0
million in legal verdict expense that primarily represents an increase to our
prior estimate of potential amounts that may be owed to class action
participants as a result of the Hsu v. Puma Biotechnology, Inc. claims process.
During the period ended September 30, 2020, we changed our estimate of the legal
verdict expense and the associated legal expense accrual for the Hsu lawsuit.
Our previous estimate was based on data and assumptions that were available at
the time. During the third and fourth quarter of 2020, we obtained additional
data, previously unavailable, from the claims report and amended claims report
filed with the Court. The claims report asserts $50.5 million in damages, which
is larger than the amount previously estimated. We intend to challenge these
claims and estimate that the damages could range from $24.8 million to $51.3
million. As a result, we have increased our estimate of the legal accrual on a
prospective basis beginning in the third quarter of 2020 to $24.8 million,
resulting in the additional $15.7 million legal verdict expense. The total
amount of aggregate class-wide damages still remains uncertain and will be
ascertained only after an extensive claims challenge process and the exhaustion
of any appeals.



For the nine months ended September 30, 2019, we recognized approximately $16.4
million in legal verdict expense related to the Eshelman v. Puma Biotechnology,
Inc., et al. verdict. The legal verdict expense of $16.4 million for the nine
months ended September 30, 2019 was the result of our initial estimate of the
total damages payable in the matter of $22.4 million, net of $6.0 million in
insurance reimbursements.



Loss on debt extinguishment:



For the nine months ended September 30, 2019, we recognized approximately $8.1
million in loss on debt extinguishment related to the fees paid in connection
with our debt refinancing during the second quarter of 2019.



Liquidity and Capital Resources

The following table summarizes our liquidity and capital resources as of September 30, 2020 and December 31, 2019, and for the nine months ended September 30, 2020 and 2019, and is intended to supplement the more detailed discussion that follows:





                                                           As of                    As of
Liquidity and capital resources (in thousands)       September 30, 2020       December 31, 2019
Cash and cash equivalents                           $             90,082     $            60,037
Marketable securities                               $             18,942     $            51,607
Working capital                                     $             41,607     $            75,459
Stockholders' (deficit) equity                      $               (453 )   $            17,463

                                                     Nine Months Ended        Nine Months Ended
                                                     September 30, 2020      September 30, 2019
Cash provided by (used in):
Operating activities                                $              6,408     $            20,810
Investing activities                                              22,580                   5,595
Financing activities                                                  45                 (67,066 )
Net increase (decrease) in cash, cash equivalents   $             29,033     $           (40,661 )
and restricted cash




Operating Activities:

For the nine months ended September 30, 2020, we reported a net loss of
approximately $45.0 million, compared to approximately $64.4 million for the
same period in 2019. Additionally, cash provided by operating activities for the
nine months ended September 30, 2020 was approximately $6.4 million compared to
approximately $20.8 million of cash provided by operating activities for the
same period in 2019, respectively.

Cash provided by operating activities for the nine months ended September 30,
2020 consisted of a net loss of approximately $45.0 million, offset by
approximately $34.2 million of non-cash items, such as stock-based compensation
and depreciation and amortization, an increase in accrued expense and other of
approximately $21.0 million, a decrease in prepaid expenses and other of
approximately $4.4 million, and a decrease in accounts receivable, net of
approximately $1.8 million. These increases were partially offset by a decrease
in accounts payable of approximately $6.7 million, an increase in other current
assets of approximately $3.1 million and other immaterial changes.

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Cash provided by operating activities for the nine months ended September 30,
2019 consisted of a net loss of approximately $64.4 million, a decrease in
prepaid expenses and other of approximately $2.9 million, a decrease in other
current assets of approximately $1.5 million, an increase of approximately $30.3
million in accrued expenses and other, an increase of approximately $9.0 million
in a post-marketing commitment liability, and approximately $60.0 million of
non-cash items, such as stock-based compensation, depreciation and amortization,
and debt extinguishment fees; partially offset by an increase in net accounts
receivable of approximately $6.4 million, an increase in inventory of
approximately $0.5 million, and a decrease in accounts payable of approximately
$11.6 million.



Investing Activities:



During the nine months ended September 30, 2020, net cash provided by investing
activities was approximately $22.6 million, compared to net cash provided by
investing activities of $5.6 million for the same period in 2019.



Net cash provided by investing activities during the nine months ended September
30, 2020 consisted of approximately $57.0 million of maturities of
available-for-sale securities, partially offset by the purchase of available for
sale securities of approximately $24.4 million and an increase in intangible
assets relating to the milestone achieved under the Company's license agreement
with Pfizer of $10.0 million.

Net cash provided by investing activities during the nine months ended September
30, 2019 consisted of approximately $132.7 million of sales or maturities of
available-for-sale securities, partially offset by $127.1 million of purchases
of available-for-sale securities.

Financing Activities:



During the nine months ended September 30, 2020, net cash was unchanged by
financing activities. During April 2020, approximately $8.4 million was borrowed
and fully repaid with no penalty or interest from Silicon Valley Bank, or SVB,
under the Paycheck Protection Program, or PPP, of the Coronavirus Aid, Relief,
and Economic Security Act.

During the same period in 2019, cash used in financing activities was
approximately $67.1 million, which consisted of approximately $80.0 million in
debt repayments, approximately $7.8 million in debt extinguishment costs and
approximately $5.6 million in debt issuance costs, partially offset by
approximately $25.0 million in proceeds from long-term debt and approximately
$1.3 million in proceeds from the exercise of stock options.

Loan and Security Agreement:



In October 2017, we entered into a loan and security agreement with SVB, as
administrative agent, and the lenders party thereto from time to time, or the
Original Lenders, including Oxford Finance, LLC, or Oxford, and SVB. Pursuant to
the terms of the credit facility provided by the loan and security agreement, or
the Original Credit Facility, we borrowed $50 million. In May 2018, we entered
into an amendment to the loan and security agreement, which provided for an
amended credit facility, or the Amended Credit Facility. Under the Amended
Credit Facility, the Original Lenders agreed to make term loans available to us
in an aggregate amount of $155 million, consisting of (i) a term loan in an
aggregate amount of $125 million, the proceeds of which, in part, were used to
repay the $50 million we borrowed under the Original Credit Facility, and (ii) a
term loan in an aggregate amount of $30 million that we drew in December 2018,
which was available to us under the Amended Credit Facility as a result of
achieving a specified minimum revenue milestone.

On June 28, 2019, or the Effective Date, we entered into a new credit facility,
or the New Credit Facility, with Oxford, as collateral agent, and the lenders
party thereto from time to time, including Oxford, pursuant to which we repaid
the $155.0 million outstanding under the Amended Credit Facility, as well as all
applicable exit and prepayment fees owed to the Original Lenders under the
Amended Credit Facility, using cash on hand and $100.0 million in new borrowings
from the New Credit Facility. Under the New Credit Facility, we issued to Oxford
new and/or replacement secured promissory notes in an aggregate principal amount
for all such promissory notes of $100.0 million evidencing the New Credit
Facility. No additional money remains available to us under the New Credit
Facility.

The New Credit Facility is secured by substantially all of our personal property
other than our intellectual property. We also pledged 65% of the issued and
outstanding capital stock of our subsidiaries, Puma Biotechnology Ltd. and Puma
Biotechnology B.V. The New Credit Facility limits our ability to grant any
interest in our intellectual property to certain permitted licenses and
permitted encumbrances set forth in the agreement.

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The term loans under the New Credit Facility bear interest at an annual rate
equal to the greater of (i) 9.0% and (ii) the sum of (a) the "prime rate," as
reported in The Wall Street Journal on the last business day of the month that
immediately precedes the month in which the interest will accrue, plus (b) 3.5%.
We are required to make monthly interest-only payments on each term loan under
the New Credit Facility commencing on the first calendar day of the calendar
month following the funding date of such term loan, and continuing on the first
calendar day of each calendar month thereafter through August 1, 2021, or the
Amortization Date. Commencing on the Amortization Date, and continuing on the
first calendar day of each calendar month thereafter, we will make consecutive
equal monthly payments of principal, together with applicable interest, in
arrears to each lender under the New Credit Facility, calculated pursuant to the
New Credit Facility. All unpaid principal and accrued and unpaid interest with
respect to each term loan under the New Credit Facility is due and payable in
full on June 1, 2024, or the Maturity Date. Upon repayment of such term loans,
we are also required to make a final payment to the new lenders equal to 7.5% of
the aggregate principal amount of such term loans outstanding as of the
Effective Date.

At our option, we may prepay the outstanding principal balance of any term loan
in whole but not in part, subject to a prepayment fee of 3.0% of any amount
prepaid if the prepayment occurs through and including the first anniversary of
the funding date of such term loan, 2.0% of the amount prepaid if the prepayment
occurs after the first anniversary of the funding date of such term loan through
and including the second anniversary of the funding date of such term loan, and
1.0% of the amount prepaid if the prepayment occurs after the second anniversary
of the funding date of such term loan and prior to the Maturity Date.

The New Credit Facility includes affirmative and negative covenants applicable
to us, our current subsidiaries and any subsidiaries we create in the future.
The affirmative covenants include, among others, covenants requiring us to
maintain our legal existence and governmental approvals, deliver certain
financial reports, maintain insurance coverage and satisfy certain requirements
regarding deposit accounts. We must also achieve certain product revenue
targets, measured as of the last day of each fiscal quarter on a trailing
year-to-date basis. New minimum revenue levels will be established for each
subsequent fiscal year by mutual agreement of us, Oxford, as collateral agent,
and the lenders under the New Credit Facility. The negative covenants include,
among others, restrictions on our transferring collateral, incurring additional
indebtedness, engaging in mergers or acquisitions, paying dividends or making
other distributions, making investments, creating liens, selling assets and
suffering a change in control, in each case subject to certain exceptions.

The New Credit Facility also includes events of default, the occurrence and
continuation of which could cause interest to be charged at the rate that is
otherwise applicable plus 5.0% and would provide Oxford, as collateral agent,
with the right to exercise remedies against us and the collateral securing the
New Credit Facility, including foreclosure against the property securing the New
Credit Facility, including our cash. These events of default include, among
other things, our failure to pay principal or interest due under the New Credit
Facility, a breach of certain covenants under the New Credit Facility, our
insolvency, a material adverse change, the occurrence of any default under
certain other indebtedness in an amount greater than $500,000 and one or more
judgments against us in an amount greater than $500,000 individually or in the
aggregate that remains unsatisfied, unvacated, or unstayed for a period of 10
days after its entry.

On August 5, 2020, we entered into an amendment to the amended and restated loan
and security agreement to revise the minimum revenue levels that we must achieve
under the terms of the New Credit Facility for the year-to-date periods ending
September 30, 2020 and December 31, 2020.



As of September 30, 2020, there were $100.0 million in term loans outstanding under the New Credit Facility, representing all of our long-term debt outstanding as of that date, and we were in compliance with all applicable covenants under the New Credit Facility.

Current and Future Financing Needs:





We did not receive or record any product revenues until the third quarter of
2017. We have spent, and expect to continue to spend, substantial amounts in
connection with implementing our business strategy, including our planned
product development efforts, our clinical trials, our research and development
efforts and our commercialization efforts.



We may choose to begin new research and development efforts or we may choose to
launch additional marketing efforts. These efforts may require funding in
addition to the cash and cash equivalents totaling approximately $90.1 million
and $18.9 million in marketable securities available at September 30, 2020.
While our consolidated financial statements have been prepared on a going
concern basis, we expect to continue incurring significant losses for the
foreseeable future and will need to generate significant revenue to sustain
operations and successfully commercialize neratinib. While we have been
successful in raising financing in the past, there can be no assurance that we
will be able to do so in the future. Our ability to obtain funding may be
adversely impacted by uncertain market conditions, including on account of the
global COVID-19 pandemic, our success in commercializing neratinib, unfavorable
decisions of regulatory authorities or adverse clinical trial results. The
outcome of these matters cannot be predicted at this time.



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In addition, we have based our estimate of capital needs on assumptions that may
prove to be wrong. Changes may occur that would consume our available capital
faster than anticipated, including the length and severity of the COVID-19
pandemic and measures taken to control the spread of COVID-19, as well as
changes in and progress of our development activities, the impact of
commercialization efforts, acquisitions of additional drug candidates and
changes in regulation. Potential sources of financing include strategic
relationships, public or private sales of equity or debt and other sources of
funds. We may seek to access the public or private equity markets when
conditions are favorable due to our long-term capital requirements. If we raise
funds by selling additional shares of common stock or other securities
convertible into common stock, the ownership interests of our existing
stockholders will be diluted. If we are not able to obtain financing when
needed, we may be unable to carry out our business plan. As a result, we may
have to significantly limit our operations, and our business, financial
condition and results of operations would be materially harmed. In such an
event, we will be required to undertake a thorough review of our programs, and
the opportunities presented by such programs, and allocate our resources in the
manner most prudent.




Non-GAAP Financial Measures



In addition to our operating results, as calculated in accordance with generally
accepted accounting principles, or GAAP, we use certain non-GAAP financial
measures when planning, monitoring, and evaluating our operational performance.
The following table presents our net loss and net loss per share, as calculated
in accordance with GAAP, as adjusted to remove the impact of stock-based
compensation. For the three and nine months ended September 30, 2020,
stock-based compensation represented approximately 14.3% and 16.6% of our
operating expenses, respectively, and 19.9% and 21.5% for the same period in
2019, in each case excluding cost of sales. Our management believes that these
non-GAAP financial measures are useful to enhance understanding of our financial
performance, are more indicative of our operational performance and facilitate a
better comparison among fiscal periods. These non-GAAP financial measures are
not, and should not be viewed as, substitutes for GAAP reporting measures.





       Reconciliation of GAAP Net Loss to Non-GAAP Adjusted Net Loss and

        GAAP Net Loss Per Share to Non-GAAP Adjusted Net Loss Per Share

                 (in thousands except share and per share data)





                                For the Three Months Ended September 30,             For the Nine Months Ended September 30,
                                    2020                        2019                    2020                        2019
GAAP net loss                 $         (31,463 )         $         (16,885 )     $         (45,001 )         $         (64,396 )
Adjustments:
Stock-based compensation -
Selling, general and
administrative                            4,101                       5,600                  13,523                      22,927   (1)
Research and development                  3,464                       6,613                  13,579                      22,864   (2)

Non-GAAP adjusted net loss $ (23,898 ) $ (4,672 ) $ (17,899 ) $ (18,605 )



GAAP net loss per
share-basic                   $           (0.79 )         $           (0.44 )     $           (1.14 )         $           (1.67 )
Adjustment to net loss (as
detailed above)                            0.19                        0.32                    0.69                        1.19
Non-GAAP adjusted basic net
loss per share                $           (0.60 )  (3)    $           (0.12 ) (4) $           (0.45 )  (3)    $           (0.48 ) (4)



(1) To reflect a non-cash charge to operating expense for selling, general, and

administrative stock-based compensation.

(2) To reflect a non-cash charge to operating expense for research and

development stock-based compensation.

(3) Non-GAAP adjusted basic net loss per share was calculated based on 39,695,444

and 39,437,691 weighted-average shares of common stock outstanding for the

three and nine months ended September 30, 2020, respectively.

(4) Non-GAAP adjusted basic net loss per share was calculated based on 38,893,757

and 38,675,961 weighted-average shares of common stock outstanding for the


    three and nine months ended September 30, 2019, respectively.



Off-Balance Sheet Arrangements

We do not have any "off-balance sheet agreements," as defined by SEC regulations.

Contractual Obligations



In June 2020, we entered into a letter agreement, or the Letter Agreement, with
Pfizer relating to the method of payment associated with our achievement of a
milestone that triggered a $40 million payment under our license agreement with
Pfizer. The Letter Agreement permits us to make the milestone payment in
installments with the majority of the amounts payable to Pfizer (including
interest) to be made in 2021 and the final payment occurring on September 30,
2021. Unpaid portions of the milestone payment will accrue interest at 6.25% per
annum until paid.

Other than as described in the preceding paragraph, there have been no material
changes outside the ordinary course of business to our contractual obligations
and commitments as described in "Management's Discussion and Analysis of
Financial Condition and Results of Operations" in our Annual Report on Form 10-K
for the year ended December 31, 2019.

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