Document:

EX-10.8

 Exhibit 10.8 

MULTIVIR INC. 

EMPLOYMENT AGREEMENT 

This Employment Agreement (the “Agreement”) is entered into by and between MultiVir Inc. (the “Company”),
and Robert E. Sobol, MD (“Executive”) as of the date the Company and Executive have each executed this Agreement, as set forth below. The terms of this Agreement will become effective as of the earlier of (a) the effective date
of the first registration statement that is filed by the Company and declared effective pursuant to Section 12(b) of the Securities Exchange Act of 1934, as amended, with respect to any class of the Company’s securities, or
(b) the consummation of the financing of the Company in a private placement of the securities of the Company in an amount of $30 million or more (each a “Trigger Event”, and the date the first Trigger Event occurs, the
“Effective Date”). If a Trigger Event is not consummated prior to June 30, 2015, this Agreement shall be null and void. 

1. Duties and Scope of Employment. 

(a) Positions and Duties. As of the Effective Date, Executive will continue to serve as the Company’s Chief Executive Officer.
Executive will render such business and professional services in the performance of Executive’s duties, consistent with Executive’s position within the Company, as will reasonably be assigned to him by the Company’s Board of Directors
(the “Board”) or its authorized delegate. Executive will report to the Board. The period of Executive’s employment under this Agreement is referred to herein as the “Employment Term.” 

(b) Obligations. During the Employment Term, Executive will perform his duties faithfully and to the best of his ability and will
devote his full business efforts and time to the Company. For the duration of the Employment Term, Executive agrees not to actively engage in any other employment, occupation or consulting activity for any direct or indirect remuneration without the
prior approval of the Board. Notwithstanding the foregoing, Executive may serve on other boards of directors, with the prior approval of the Board, or engage in religious, charitable or other community activities as long as such services and
activities are disclosed to the Board and do not materially interfere with the Executive’s performance of his duties as provided in this Agreement and such activities do not adversely affect the business, reputation or public stock price of the
Company. Executive further agrees to comply with all Company policies, including, for the avoidance of any doubt, any insider trading policies and compensation clawback policies currently in existence or that may be adopted by the Company during the
Term. 
 2. At-Will Employment. The parties agree that Executive’s employment with the Company remains “at-will”
employment and may be terminated at any time with or without cause or notice. Executive understands and agrees that neither his job performance nor promotions, commendations, bonuses or the like from the Company give rise to or in any way serve as
the basis for modification, amendment, or extension, by implication or otherwise, of his employment with the Company. However, as described in this Agreement, Executive may be entitled to severance benefits depending on the circumstances of
Executive’s termination of employment with the Company. 

 3. Compensation. 

(a) Base Salary. During the Employment Term, the Company will pay Executive an annual salary of $506,000 as compensation for his
services (the “Base Salary”). The Base Salary will be paid periodically in accordance with the Company’s normal payroll practices and be subject to the usual, required withholding. Executive’s Base Salary will be subject
to review and adjustments will be made based upon the Company’s normal performance review practices. In the event the market capitalization value of the Company shall be over $600 million for a period of thirty (30) consecutive trading
days, Executive’s Base Salary shall be increased going forward to $556,600 per annum. The increase shall be subject to approval by the Board or its authorized delegate. 

(b) Target Bonus. Executive will be eligible to receive an annual bonus of up to sixty percent (60%) of Executive’s Base
Salary (the “Target Bonus”) upon achievement of performance objectives to be determined by the Board, the Compensation Committee of the Board (the “Compensation Committee”), or the Board’s or Compensation
Committee’s delegate, in its sole discretion. The amount of annual bonus to be paid to Executive, if any, will be: (i) determined in the sole discretion of the Board, the Compensation Committee or their delegate; (ii) paid in
accordance with the Company’s normal payroll practices and be subject to the usual, required withholding; and (iii) subject to Executive’s continued employment with the Company through the payment date. 

(c) Equity. Executive will be eligible to receive Equity Awards pursuant to any plans or arrangements the Company may have in effect
from time to time. The Board or the Compensation Committee will determine in its discretion whether Executive will be granted any such Equity Awards and the terms of any such Equity Award in accordance with the terms of any applicable plan or
arrangement that may be in effect from time to time. 
 4. Employee Benefits. During the Employment Term, Executive will be entitled
to participate in executive benefit plans and programs of the Company, if any, on the same terms and conditions as other similarly-situated employees to the extent that Executive’s position, tenure, salary, age, health and other qualifications
make Executive eligible to participate in such plans or programs, subject to the rules and regulations applicable thereto. The Company reserves the right to cancel or change the benefit plans and programs it offers to its employees at any time. 

5. Vacation. Executive will be entitled to paid vacation in accordance with the Company’s vacation policy, with the timing and
duration of specific days off mutually and reasonably agreed to by the parties hereto. While four weeks per year vacation are available to the Executive as a senior executive of the Company, in this regard, the Executive is encouraged to consider
the Company’s credo that the Company will take a holiday when cancer takes a holiday. 
 6. Expenses. The Company will reimburse
Executive for reasonable travel, entertainment or other expenses incurred by Executive in the furtherance of or in connection with the performance of Executive’s duties hereunder, in accordance with the Company’s expense reimbursement
policy as in effect from time to time. 

  
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 7. Severance Benefits. 

(a) Termination Outside the Change of Control Period. If, outside the Change of Control Period, the Company or its Affiliates terminate
Executive’s employment with the Company or its Affiliates, respectively, other than for Cause, death or Disability, or Executive resigns from such employment for Good Reason, then, subject to Section 8, Executive will receive the following
severance benefits: 
 (i) Salary Severance. Continuing payments of severance pay at a rate equal to Executive’s then-current
Base Salary for twelve (12) months from the date of Executive’s termination of employment, which will be paid in accordance with the schedule set forth in Section 8(b) and the Company’s normal payroll practices and be subject to
the usual, required withholding. 
 (ii) Continued Employee Benefits. If Executive elects continuation coverage pursuant to the
Consolidated Omnibus Budget Reconciliation Act of 1985, as amended (“COBRA”) within the time period prescribed pursuant to COBRA for Executive and Executive’s eligible dependents, the Company will reimburse Executive for the
premiums necessary to continue group health insurance benefits for Executive and Executive’s eligible dependents until the earlier of (A) a period of twelve (12) months from the date of Executive’s termination of employment,
(B) the date upon which Executive and/or Executive’s eligible dependents becomes covered under similar plans or (C) the date upon which Executive ceases to be eligible for coverage under COBRA (such reimbursements, the “COBRA
Premiums”). However, if the Company determines in its sole discretion that it cannot pay the COBRA Premiums without potentially violating applicable law (including, without limitation, Section 2716 of the Public Health Service Act),
the Company will in lieu thereof provide to Executive a taxable monthly payment payable on the last day of a given month (except as provided by the following sentence), in an amount equal to the monthly COBRA premium that Executive would be required
to pay to continue Executive’s group health coverage in effect on the date of Executive’s termination of employment (which amount will be based on the premium for the first month of COBRA coverage), which payments will be made regardless
of whether Executive elects COBRA continuation coverage and will end on the earlier of (x) the date upon which Executive obtains other employment or (y) the date the Company has paid an amount equal to twelve (12) payments. Any such
taxable monthly payment will be paid in accordance with the schedule set forth in Section 8(b). For the avoidance of doubt, the taxable payments in lieu of COBRA Premiums may be used for any purpose, including, but not limited to continuation
coverage under COBRA, and will be subject to all applicable tax withholdings. Notwithstanding anything to the contrary under this Agreement, if at any time the Company determines in its sole discretion that it cannot provide the payments
contemplated by the preceding sentence without violating applicable law (including, without limitation, Section 2716 of the Public Health Service Act), Executive will not receive such payment or any further reimbursements for COBRA premiums.

 (b) Termination without Cause or Resignation for Good Reason within the Change of Control Period. If, within the Change of Control
Period, the Company or its Affiliates terminate Executive’s employment with the Company or its Affiliates, respectively, other than for Cause, death or Disability, or Executive resigns from such employment for Good Reason, then, subject to
Section 8, Executive will receive the following severance benefits from the Company: 

  
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 (i) Salary Severance. A lump sum severance payment equal to (A) eighteen
(18) months of Executive’s Base Salary, with such amount calculated based on Executive’s Base Salary as of the termination date (or if higher, as of immediately prior to the Change of Control), plus (B) one hundred percent
(100%) of the higher of (A) Executive’s Target Bonus as in effect for the fiscal year in which the Change of Control occurs or (B) Executive’s Target Bonus as in effect for the fiscal year in which Executive’s
termination of employment occurs. Severance payable pursuant to this Section 7(b)(i) will paid in accordance with the schedule set forth in Section 8(b). 

(ii) Continued Employee Benefits. If Executive elects continuation coverage pursuant to COBRA within the time period prescribed
pursuant to COBRA for Executive and Executive’s eligible dependents, the Company will reimburse Executive for the premiums necessary to continue group health insurance benefits for Executive and Executive’s eligible dependents until the
earlier of (A) a period of eighteen (18) months from the date of Executive’s termination of employment, (B) the date upon which Executive and/or Executive’s eligible dependents becomes covered under similar plans or
(C) the date upon which Executive ceases to be eligible for coverage under COBRA (such reimbursements, the “COC COBRA Premiums”). However, if the Company determines in its sole discretion that it cannot pay the COC COBRA
Premiums without potentially violating applicable law (including, without limitation, Section 2716 of the Public Health Service Act), the Company will in lieu thereof provide to Executive a taxable lump sum payment in an amount equal to the
monthly COBRA premium that Executive would be required to pay to continue Executive’s group health coverage in effect on the date of Executive’s termination of employment (which amount will be based on the premium for the first month of
COBRA coverage) multiplied by eighteen (18), which payment will be made regardless of whether Executive elects COBRA continuation coverage. Any such taxable lump sum payment will be paid in accordance with the schedule set forth in
Section 8(b). For the avoidance of doubt, the taxable payment in lieu of COC COBRA Premiums may be used for any purpose, including, but not limited to continuation coverage under COBRA, and will be subject to all applicable tax withholdings.
Notwithstanding anything to the contrary under this Agreement, if at any time the Company determines in its sole discretion that it cannot provide the payment contemplated by the preceding sentence without violating applicable law (including,
without limitation, Section 2716 of the Public Health Service Act), Executive will not receive such payment or any further reimbursements for COBRA premiums. 

(c) Voluntary Resignation; Termination for Cause. If Executive’s employment with the Company or its Affiliates terminates
(i) voluntarily by Executive (other than for Good Reason) or (ii) for Cause by the Company, then Executive will not be entitled to receive severance or other benefits except for those (if any) as may then be established under the
Company’s then existing severance and benefits plans and practices or pursuant to other written agreements with the Company. 
 (d)
Disability; Death. If the Company terminates Executive’s employment as a result of Executive’s Disability, or Executive’s employment terminates due to Executive’s death, then Executive will not be entitled to receive
severance or other benefits except for those (if any) as may then be established under the Company’s then existing written severance and benefits plans and practices or pursuant to other written agreements with the Company. 

  
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 (e) Accrued Compensation. For the avoidance of any doubt, in the event of a termination of
Executive’s employment with the Company or its Affiliates, Executive will be entitled to receive all accrued but unpaid vacation, expense reimbursements, wages, and other benefits due to Executive under any Company-provided plans, policies, and
arrangements. 
 (f) Exclusive Remedy. In the event of a termination of Executive’s employment with the Company or its
Affiliates, the provisions of this Section 7 are intended to be and are exclusive and in lieu of any other rights or remedies to which Executive or the Company may otherwise be entitled, whether at law, tort or contract, in equity. Executive
will be entitled to no benefits, compensation or other payments or rights upon termination of employment other than those benefits expressly set forth in this Section 7. 

8. Conditions to Receipt of Severance/Timing of Severance. 

(a) Separation Agreement and Release of Claims. The receipt of any severance pursuant to Sections 7(a) or (b) will be subject to
(i) Executive resigning from all positions Executive may hold as an officer or director of the Company or any Affiliates and executing all documents the Company determines, in its sole discretion, are necessary to effectuate such resignations
prior to the Release Deadline (as defined below) (such resignation and execution of applicable documents, the “Resignations”), and (ii) Executive signing and not revoking a separation agreement and release of claims in a form
reasonably satisfactory to the Company (the “Release”) and provided that such Release becomes effective and irrevocable no later than sixty (60) days following the termination date (such deadline, the “Release
Deadline”). If the Resignations and the Release do not become effective and irrevocable by the Release Deadline, Executive will forfeit any rights to severance or benefits under this Agreement. In no event will severance payments or
benefits be paid or provided until the Resignations and the Release become effective and irrevocable. 
 (b) Timing of Severance
Payments. Provided that the Release becomes effective and irrevocable by the Release Deadline, any severance payments or benefits under this Agreement will be paid on, or, in the case of installments, will not commence until, the sixtieth
(60th) day following Executive’s separation from service, or, if later, such time as required by Section 8(c)(ii). Except as required by Section 8(c)(ii), any installment payments that would have been made to Executive during the
sixty (60) day period immediately following Executive’s separation from service but for the preceding sentence will be paid to Executive on the sixtieth (60th) day following Executive’s separation from service and the remaining
payments shall be made as provided in this Agreement. In no event will Executive have discretion to determine the taxable year of payment for any Deferred Payments. 

(c) Section 409A. 

(i) Notwithstanding anything to the contrary in this Agreement, no Deferred Payments will be paid or otherwise provided until Executive has a
“separation from service” within the meaning of Section 409A. Similarly, no severance payable to Executive, if any, pursuant to this Agreement that otherwise would be exempt from Section 409A pursuant to Treasury Regulation
Section 1.409A-1(b)(9) will be payable until Executive has a “separation from service” within the meaning of Section 409A. 

  
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 (ii) Notwithstanding anything to the contrary in this Agreement, if Executive is a
“specified employee” within the meaning of Section 409A at the time of Executive’s separation from service (other than due to death), then the Deferred Payments, if any, that are payable within the first six (6) months
following Executive’s separation from service, will become payable on the first payroll date that occurs on or after the date that is six (6) months and one (1) day following the date of Executive’s separation from service. All
subsequent Deferred Payments, if any, will be payable in accordance with the payment schedule applicable to each payment or benefit. Notwithstanding anything herein to the contrary, if Executive dies following his separation from service, but prior
to the six (6) month anniversary of the separation from service, then any payments delayed in accordance with this Section 8(c)(ii) will be payable in a lump sum as soon as administratively practicable after the date of Executive’s
death and all other Deferred Payments will be payable in accordance with the payment schedule applicable to each payment or benefit. Each payment, installment and benefit payable under this Agreement is intended to constitute a separate payment for
purposes of Section 1.409A-2(b)(2) of the Treasury Regulations. 
 (iii) Any amount paid under this Agreement that satisfies the
requirements of the “short-term deferral” rule set forth in Section 1.409A-1(b)(4) of the Treasury Regulations will not constitute Deferred Payments. Any amount paid under this Agreement that qualifies as a payment made as a result of
an involuntary separation from service pursuant to Section 1.409A-1(b)(9)(iii) of the Treasury Regulations that does not exceed the Section 409A Limit (as defined below) will not constitute Deferred Payments. 

(iv) The foregoing provisions and all compensation and benefits provided for under this Agreement are intended to comply with or be exempt
from the requirements of Section 409A so that none of the severance payments and benefits to be provided hereunder will be subject to the additional tax imposed under Section 409A, and any ambiguities or ambiguous terms herein will be
interpreted to be exempt or so comply. The Company and Executive agree to work together in good faith to consider amendments to this Agreement and to take such reasonable actions which are necessary, appropriate or desirable to avoid imposition of
any additional tax or income recognition prior to actual payment to Executive under Section 409A. In no event will the Company reimburse Executive for any taxes that may be imposed on Executive as a result of Section 409A. 

(d) Proprietary Information and Inventions Agreement. Executive’s receipt of any payments or benefits under Section 7 will be
subject to Executive continuing to comply with the terms of the Proprietary Information and Inventions Agreement and the provisions of this Agreement. 

(e) No Duty to Mitigate. Executive will not be required to mitigate the amount of any payment contemplated by this Agreement, nor will
any earnings that Executive may receive from any other source reduce any such payment 
 9. Limitation on Payments. In the event that
the severance and other benefits provided for in this Agreement or otherwise payable to Executive (i) constitute “parachute payments” within the meaning of Section 280G of the Internal Revenue Code of 1986, as amended (the
“Code”) and (ii) but for this Section 9, would be subject to the excise tax imposed by Section 4999 of the Code, then Executive’s severance benefits under Section 7 will be either: 

  
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 (a) delivered in full, or 

(b) delivered as to such lesser extent which would result in no portion of such severance benefits being subject to excise tax under
Section 4999 of the Code, whichever of the foregoing amounts, taking into account the applicable federal, state and local income taxes and the excise tax imposed by Section 4999 of the Code, results in the receipt by Executive on an
after-tax basis, of the greatest amount of severance benefits, notwithstanding that all or some portion of such severance benefits may be taxable under Section 4999 of the Code. If a reduction in severance and other benefits constituting
“parachute payments” is necessary so that benefits are delivered to a lesser extent, reduction will occur in the following order: (i) reduction of cash payments, which shall occur in reverse chronological order such that the cash
payment owed on the latest date following the occurrence of the event triggering such excise tax will be the first cash payment to be reduced; (ii) reduction of acceleration of vesting of Equity Awards, which shall occur in the reverse order of
the date of grant for such Equity Awards (i.e., the vesting of the most recently granted Equity Awards will be reduced first); and (iii) reduction of other benefits paid or provided to Executive, which will occur in reverse chronological order
such that the benefit owed on the latest date following the occurrence of the event triggering such excise tax will be the first benefit to be reduced. If more than one Equity Award was made to Executive on the same date of grant, all such awards
shall have their acceleration of vesting reduced pro rata. In no event will Executive have any discretion with respect to the ordering of payment reductions. 

Unless the Company and Executive otherwise agree in writing, any determination required under this Section 9 will be made in writing by a
nationally recognized firm of independent public accountants selected by the Company (the “Accountants”), whose determination will be conclusive and binding upon Executive and the Company for all purposes. For purposes of making the
calculations required by this Section 9, the Accountants may make reasonable assumptions and approximations concerning applicable taxes and may rely on reasonable, good faith interpretations concerning the application of Sections 280G and 4999
of the Code. The Company and Executive will furnish to the Accountants such information and documents as the Accountants may reasonably request in order to make a determination under this Section. The Company will bear all costs the Accountants may
reasonably incur in connection with any calculations contemplated by this Section 9. 
 10. Definition of Terms. The following
terms referred to in this Agreement will have the following meanings: 
 (a) Affiliate. “Affiliate” means the
Company and any other parent or subsidiary corporation of the Company, as such terms are defined in Section 424(e) and (1) of the Code. 

(b) Cause. “Cause” means (i) Executive’s dishonest statements or acts with respect to the Company or any
Affiliate to any governmental regulatory agency or authority; (ii) Executive’s commission of any felony or commission of any crime involving fraud, dishonesty or moral turpitude; (iii) Executive’s commission or attempted
commission of or participation in a fraud or act of dishonesty against the Company; (iv) Executive’s material breach of any contract or agreement between Executive and the Company or Executive’s material breach of any legal duty he
owes to the Company; (v) conduct by Executive that constitutes insubordination, incompetence or 

  
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neglect of duties; or (vi) Executive’s failure to perform the duties, functions and responsibilities of Executive’s position; provided, however, the actions or conduct described in
clauses (iv), (v) and (vi) above will only constitute Cause if the Company provides Executive with written notice thereof and Executive has not cured within thirty (30) days of such written notice. 

(c) Change of Control. “Change of Control” means the occurrence of any of the following events: 

(i) A change in the ownership of the Company which occurs on the date that any one person, or more than one person acting as a group
(“Person”), acquires ownership of the stock of the Company that, together with the stock held by such Person, constitutes more than 50% of the total voting power of the stock of the Company; provided, however, that for purposes
of this subsection, the acquisition of additional stock by any one Person, who is considered to own more than 50% of the total voting power of the stock of the Company will not be considered a Change of Control. Further, if the stockholders of
the Company immediately before such change in ownership continue to retain immediately after the change in ownership, in substantially the same proportions as their ownership of shares of the Company’s voting stock immediately prior to the
change in ownership, direct or indirect beneficial ownership of 50% or more of the total voting power of the stock of the Company or of the ultimate parent entity of the Company, such event shall not be considered a Change of Control under this
subsection (i). For this purpose, indirect beneficial ownership shall include, without limitation, an interest resulting from ownership of the voting securities of one or more corporations or other business entities which own the Company, as the
case may be, either directly or through one or more subsidiary corporations or other business entities; or 
 (ii) A change in the
effective control of the Company which occurs on the date that a majority of members of the Board is replaced during any 12-month period by Directors whose appointment or election is not endorsed by a majority of the members of the Board prior to
the date of the appointment or election. For purposes of this subsection (ii), if any Person is considered to be in effective control of the Company, the acquisition of additional control of the Company by the same Person will not be considered a
Change of Control; or 
 (iii) A change in the ownership of a substantial portion of the Company’s assets which occurs on the date
that any Person acquires (or has acquired during the 12-month period ending on the date of the most recent acquisition by such person or persons) assets from the Company that have a total gross fair market value equal to or more than
50% of the total gross fair market value of all of the assets of the Company immediately prior to such acquisition or acquisitions; provided, however, that for purposes of this subsection (iii), the following will not constitute a change in the
ownership of a substantial portion of the Company’s assets: (A) a transfer to an entity that is controlled by the Company’s stockholders immediately after the transfer, or (B) a transfer of assets by the Company to: (1) a
stockholder of the Company (immediately before the asset transfer) in exchange for or with respect to the Company’s stock, (2) an entity, 50% or more of the total value or voting power of which is owned, directly or indirectly,
by the Company, (3) a Person, that owns, directly or indirectly, 50% or more of the total value or voting power of all the outstanding stock of the Company, or (4) an entity, at least 50% of the total value or voting power of
which is owned, directly or indirectly, by a Person described in this subsection (iii)(B)(3). For purposes of this subsection (iii), gross fair market value means the value of the assets of the Company, or the value of the assets being disposed of,
determined without regard to any liabilities associated with such assets. 

  
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 For purposes of this definition, Persons will be considered to be acting as a group if they are
owners of a corporation that enters into a merger, consolidation, purchase or acquisition of stock, or similar business transaction with the Company. 

Notwithstanding the foregoing, a transaction will not be deemed a Change of Control unless the transaction qualifies as a change in control
event within the meaning of Code Section 409A, as it has been and may be amended from time to time, and any proposed or final Treasury Regulations and Internal Revenue Service guidance that has been promulgated or may be promulgated thereunder
from time to time. 
 Further and for the avoidance of doubt, a transaction will not constitute a Change of Control if: (i) its sole
purpose is to change the state of the Company’s incorporation, or (ii) its sole purpose is to create a holding company that will be owned in substantially the same proportions by the Persons who held the Company’s securities
immediately before such transaction. 
 (d) Change of Control Period. “Change of Control Period” means the twelve
(12) months period commencing immediately following the date of the first Change of Control to occur after the Effective Date. 
 (e)
Code. “Code” means the Internal Revenue Code of 1986, as amended. 
 (f) Deferred Payment. “Deferred
Payment” means any severance pay or benefits to be paid or provided to Executive (or Executive’s estate or beneficiaries) pursuant to this Agreement and any other severance payments or separation benefits, that in each case, when
considered together, are considered deferred compensation under Section 409A. 
 (g) Disability. “Disability”
means that the Employee has been unable to perform Executive’s Company duties as the result of Executive’s incapacity due to physical or mental illness, and such inability, at least twenty-six (26) weeks after its commencement or 180
days in any consecutive twelve (12) month period, is determined to be total and permanent by a physician selected by the Company or its insurers and acceptable to Executive or Executive’s legal representative (such agreement as to
acceptability not to be unreasonably withheld). Termination resulting from Disability may only be effected after at least thirty (30) days’ written notice by the Company of its intention to terminate the Employee’s employment. In the
event that the Employee resumes the performance of substantially all of Executive’s duties hereunder before the termination of Executive’s employment becomes effective, the notice of intent to terminate will automatically be deemed to have
been revoked. 
 (h) Equity Awards. “Equity Awards” means Executive’s outstanding stock options, stock
appreciation rights, restricted stock, restricted stock units, performance shares, performance stock units and any other Company equity compensation awards. 

(i) Good Reason. “Good Reason” means Executive’s resignation within thirty (30) days following the
expiration of any Company cure period (discussed below) following the occurrence of one or more of the following, without Executive’s consent: (i) a material reduction in 

  
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Executive’s Base Salary, excluding the substitution of substantially equivalent compensation and benefits, that is applicable to all Company senior management; (ii) a material reduction
of Executive’s authority, duties or responsibilities, unless Executive is provided with a comparable position; provided, however, that a reduction in authority, duties, or responsibilities solely by virtue of the Company being acquired and made
part of a larger entity whether as a subsidiary, business unit or otherwise (as, for example, when the Chief Executive Officer of the Company remains as such following an acquisition where the Company becomes a wholly owned subsidiary of the
acquirer, but is not made the Chief Executive Officer of the acquiring corporation) will not constitute “Good Reason”; or (iii) a material change in the geographic location of Executive’s primary work facility or location;
provided, that a relocation of fifty (50) miles or less from Executive’s then present location or to Executive’s home as his primary work location will not be considered a material change in geographic location. In order for an event
to qualify as Good Reason, Executive must not terminate employment with the Company without first providing the Company with written notice of the acts or omissions constituting the grounds for “Good Reason” within ninety (90) days of
the initial existence of the grounds for “Good Reason” and a reasonable cure period of not less than thirty (30) days following the date of such notice, and such grounds must not have been cured during such time. 

(j) Proprietary Information and Inventions Agreement. “Proprietary Information and Inventions Agreement” means the At
Will Employment, Confidential Information, Invention Assignment, and Arbitration Agreement dated as of the date hereof executed by the Company and Executive. 

(k) Section 409A. “Section 409A” means Section 409A of the Code and any final regulations and guidance
thereunder and any applicable state law equivalent, as each may be amended or promulgated from time to time. 
 (l) Section 409A
Limit. “Section 409A Limit” will mean two (2) times the lesser of: (i) Executive’s annualized compensation based upon the annual rate of pay paid to Executive during the Executive’s taxable year preceding the
Executive’s taxable year of Executive’s separation from service as determined under Treasury Regulation Section 1.409A-1(b)(9)(iii)(A)(1) and any Internal Revenue Service guidance issued with respect thereto; or (ii) the maximum
amount that may be taken into account under a qualified plan pursuant to Section 401(a)(17) of the Internal Revenue Code for the year in which Executive’s separation from service occurred. 

11. Confidential Information. Executive confirms his continuing obligations under the Proprietary Information and Inventions Agreement.

 12. Assignment. This Agreement will be binding upon and inure to the benefit of (a) the heirs, executors and legal
representatives of Executive upon Executive’s death and (b) any successor of the Company. Any such successor of the Company will be deemed substituted for the Company under the terms of this Agreement for all purposes. For this purpose,
“successor” means any person, firm, corporation or other business entity which at any time, whether by purchase, merger or otherwise, directly or indirectly acquires all or substantially all of the assets or business of the Company. None
of the rights of Executive to receive any form of compensation payable pursuant to this Agreement may be assigned or transferred except by will or the laws of descent and distribution. 

  
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Any other attempted assignment, transfer, conveyance or other disposition of Executive’s right to compensation or other benefits will be null and void. 

13. Notices. All notices, requests, demands and other communications called for hereunder will be in writing and will be deemed given
(i) on the date of delivery if delivered personally, (ii) one (1) day after being sent by a well established commercial overnight service, or (iii) four (4) days after being mailed by registered or certified mail, return
receipt requested, prepaid and addressed to the parties or their successors at the following addresses, or at such other addresses as the parties may later designate in writing: 

If to the Company: 
 MultiVir
Inc. 
 Attn: Chief Executive Officer 

410 Pierce Street, Suite 325 

Houston, TX 77002 
 If to
Executive: 
 at the last residential address known by the Company. 

14. Severability. In the event that any provision hereof becomes or is declared by a court of competent jurisdiction to be illegal,
unenforceable or void, this Agreement will continue in full force and effect without said provision. 
 15. Integration. This
Agreement and the Proprietary Information and Inventions Agreement represents the entire agreement and understanding between the parties as to the subject matter herein and supersedes all prior or contemporaneous agreements whether written or oral,
including, but not limited to, the Consulting Retainer Letter Agreement entered into between the parties, dated April 2, 2014 and the undated Employment Agreement entered into between the parties, on or around April 2014. This Agreement may be
modified only by agreement of the parties by a written instrument executed by the parties that is designated as an amendment to this Agreement. 

16. Waiver of Breach. The waiver of a breach of any term or provision of this Agreement, which must be in writing, will not operate as
or be construed to be a waiver of any other previous or subsequent breach of this Agreement. 
 17. Headings. All captions and
section headings used in this Agreement are for convenient reference only and do not form a part of this Agreement. 
 18. Tax
Withholding. All payments made pursuant to this Agreement will be subject to withholding of applicable taxes. 
 19. Arbitration.
Any dispute or controversy arising out of or relating to any interpretation, construction, performance or breach of the Agreement or the Proprietary Information and Inventions Agreement, will be settled by arbitration pursuant to the arbitration
provisions set forth in the Proprietary Information and Inventions Agreement. 

  
 11 

 20. Governing Law. This Agreement will be governed by the laws of the State of Texas (with
the exception of its conflict of laws provisions). 
 21. Acknowledgment. Executive acknowledges that he has had the opportunity to
discuss this matter with and obtain advice from his private attorney, has had sufficient time to, and has carefully read and fully understands all the provisions of this Agreement, and is knowingly and voluntarily entering into this Agreement. 

22. Gender Neutral. Wherever used herein, a pronoun in the masculine gender will be considered as including the feminine gender unless
the context clearly indicates otherwise. 
 23. Counterparts. This Agreement may be executed in counterparts, and each counterpart
will have the same force and effect as an original and will constitute an effective, binding agreement on the part of each of the undersigned. 

  
 12 

 IN WITNESS WHEREOF, each of the parties has executed this Agreement, in the case of the Company
by their duly authorized officers, as of the day and year set forth below. 
  

											
	COMPANY:	 		 		 	
					
	MULTIVIR INC.	 		 		 		 	
						
	By:	 	 /s/ Nicholas Puro
	 		 	Date:	 	 March 3, 2015
	 	
	 Title:
	 	President and Chief Operating Officer	 		 		 		 	

  

											
	EXECUTIVE:	 		 		 		 	
					
	 /s/ Robert E. Sobol
	 		 	Date:	 	March 3, 2015	 	
	 ROBERT E. SOBOL, MD
	 		 		 		 		 	
		 		 		 		 		 	

 [SIGNATURE PAGE TO EXECUTIVE EMPLOYMENT AGREEMENT] 

  
 13EX-10.9

 Exhibit 10.9 

MULTIVIR INC. 

EMPLOYMENT AGREEMENT 

This Employment Agreement (the “Agreement”) is entered into by and between MultiVir Inc. (the “Company”),
and Nicholas Puro, JD (“Executive”) as of the date the Company and Executive have each executed this Agreement, as set forth below. The terms of this Agreement will become effective as of the earlier of (a) the effective date
of the first registration statement that is filed by the Company and declared effective pursuant to Section 12(b) of the Securities Exchange Act of 1934, as amended, with respect to any class of the Company’s securities, or
(b) the consummation of the financing of the Company in a private placement of the securities of the Company in an amount of $30 million or more (each a “Trigger Event”, and the date the first Trigger Event occurs, the
“Effective Date”). If a Trigger Event is not consummated prior to June 30, 2015, this Agreement shall be null and void. 

1. Duties and Scope of Employment. 

(a) Positions and Duties. As of the Effective Date, Executive will continue to serve as the Company’s President, Chief Operating
Officer and Interim Chief Financial Officer. Executive will render such business and professional services in the performance of Executive’s duties, consistent with Executive’s position within the Company, as will reasonably be assigned to
him by the Company’s Board of Directors (the “Board”) or its authorized delegate. Executive will report to the Board and the Company’s Chief Executive Officer. The period of Executive’s employment under this Agreement
is referred to herein as the “Employment Term.” 
 (b) Obligations. During the Employment Term, Executive will
perform his duties faithfully and to the best of his ability and will devote his full business efforts and time to the Company. For the duration of the Employment Term, Executive agrees not to actively engage in any other employment, occupation or
consulting activity for any direct or indirect remuneration without the prior approval of the Board. Notwithstanding the foregoing, Executive may serve on other boards of directors, with the prior approval of the Board, or engage in religious,
charitable or other community activities as long as such services and activities are disclosed to the Board and do not materially interfere with the Executive’s performance of his duties as provided in this Agreement and such activities do not
adversely affect the business, reputation or public stock price of the Company. Executive further agrees to comply with all Company policies, including, for the avoidance of any doubt, any insider trading policies and compensation clawback policies
currently in existence or that may be adopted by the Company during the Term. 
 2. At-Will Employment. The parties agree that
Executive’s employment with the Company remains “at-will” employment and may be terminated at any time with or without cause or notice. Executive understands and agrees that neither his job performance nor promotions, commendations,
bonuses or the like from the Company give rise to or in any way serve as the basis for modification, amendment, or extension, by implication or otherwise, of his employment with the Company. However, as described in this Agreement, Executive may be
entitled to severance benefits depending on the circumstances of Executive’s termination of employment with the Company. 

 3. Compensation. 

(a) Base Salary. During the Employment Term, the Company will pay Executive an annual salary of $400,000 as compensation for his
services (the “Base Salary”). The Base Salary will be paid periodically in accordance with the Company’s normal payroll practices and be subject to the usual, required withholding. Executive’s Base Salary will be subject
to review and adjustments will be made based upon the Company’s normal performance review practices. In the event the market capitalization value of the Company shall be over $600 million for a period of thirty (30) consecutive trading
days, Executive’s Base Salary shall be increased going forward to $440,000 per annum. The increase shall be subject to approval by the Board or its authorized delegate. 

(b) Target Bonus. Executive will be eligible to receive an annual bonus of up to sixty percent (60%) of Executive’s Base
Salary (the “Target Bonus”) upon achievement of performance objectives to be determined by the Board, the Compensation Committee of the Board (the “Compensation Committee”), or the Board’s or Compensation
Committee’s delegate, in its sole discretion. The amount of annual bonus to be paid to Executive, if any, will be: (i) determined in the sole discretion of the Board, the Compensation Committee or their delegate; (ii) paid in
accordance with the Company’s normal payroll practices and be subject to the usual, required withholding; and (iii) subject to Executive’s continued employment with the Company through the payment date. 

(c) Equity. Executive will be eligible to receive Equity Awards pursuant to any plans or arrangements the Company may have in effect
from time to time. The Board or the Compensation Committee will determine in its discretion whether Executive will be granted any such Equity Awards and the terms of any such Equity Award in accordance with the terms of any applicable plan or
arrangement that may be in effect from time to time. 
 4. Employee Benefits. During the Employment Term, Executive will be entitled
to participate in executive benefit plans and programs of the Company, if any, on the same terms and conditions as other similarly-situated employees to the extent that Executive’s position, tenure, salary, age, health and other qualifications
make Executive eligible to participate in such plans or programs, subject to the rules and regulations applicable thereto. The Company reserves the right to cancel or change the benefit plans and programs it offers to its employees at any time. 

5. Vacation. Executive will be entitled to paid vacation in accordance with the Company’s vacation policy, with the timing and
duration of specific days off mutually and reasonably agreed to by the parties hereto. While four weeks per year vacation are available to the Executive as a senior executive of the Company, in this regard, the Executive is encouraged to consider
the Company’s credo that the Company will take a holiday when cancer takes a holiday. 
 6. Expenses. The Company will reimburse
Executive for reasonable travel, entertainment or other expenses incurred by Executive in the furtherance of or in connection with the performance of Executive’s duties hereunder, in accordance with the Company’s expense reimbursement
policy as in effect from time to time. 

  
 2 

 7. Severance Benefits. 

(a) Termination Outside the Change of Control Period. If, outside the Change of Control Period, the Company or its Affiliates terminate
Executive’s employment with the Company or its Affiliates, respectively, other than for Cause, death or Disability, or Executive resigns from such employment for Good Reason, then, subject to Section 8, Executive will receive the following
severance benefits: 
 (i) Salary Severance. Continuing payments of severance pay at a rate equal to Executive’s then-current
Base Salary for twelve (12) months from the date of Executive’s termination of employment, which will be paid in accordance with the schedule set forth in Section 8(b) and the Company’s normal payroll practices and be subject to
the usual, required withholding. 
 (ii) Continued Employee Benefits. If Executive elects continuation coverage pursuant to the
Consolidated Omnibus Budget Reconciliation Act of 1985, as amended (“COBRA”) within the time period prescribed pursuant to COBRA for Executive and Executive’s eligible dependents, the Company will reimburse Executive for the
premiums necessary to continue group health insurance benefits for Executive and Executive’s eligible dependents until the earlier of (A) a period of twelve (12) months from the date of Executive’s termination of employment,
(B) the date upon which Executive and/or Executive’s eligible dependents becomes covered under similar plans or (C) the date upon which Executive ceases to be eligible for coverage under COBRA (such reimbursements, the “COBRA
Premiums”). However, if the Company determines in its sole discretion that it cannot pay the COBRA Premiums without potentially violating applicable law (including, without limitation, Section 2716 of the Public Health Service Act),
the Company will in lieu thereof provide to Executive a taxable monthly payment payable on the last day of a given month (except as provided by the following sentence), in an amount equal to the monthly COBRA premium that Executive would be required
to pay to continue Executive’s group health coverage in effect on the date of Executive’s termination of employment (which amount will be based on the premium for the first month of COBRA coverage), which payments will be made regardless
of whether Executive elects COBRA continuation coverage and will end on the earlier of (x) the date upon which Executive obtains other employment or (y) the date the Company has paid an amount equal to twelve (12) payments. Any such
taxable monthly payment will be paid in accordance with the schedule set forth in Section 8(b). For the avoidance of doubt, the taxable payments in lieu of COBRA Premiums may be used for any purpose, including, but not limited to continuation
coverage under COBRA, and will be subject to all applicable tax withholdings. Notwithstanding anything to the contrary under this Agreement, if at any time the Company determines in its sole discretion that it cannot provide the payments
contemplated by the preceding sentence without violating applicable law (including, without limitation, Section 2716 of the Public Health Service Act), Executive will not receive such payment or any further reimbursements for COBRA premiums.

 (b) Termination without Cause or Resignation for Good Reason within the Change of Control Period. If, within the Change of Control
Period, the Company or its Affiliates terminate Executive’s employment with the Company or its Affiliates, respectively, other than for Cause, death or Disability, or Executive resigns from such employment for Good Reason, then, subject to
Section 8, Executive will receive the following severance benefits from the Company: 

  
 3 

 (i) Salary Severance. A lump sum severance payment equal to (A) eighteen
(18) months of Executive’s Base Salary, with such amount calculated based on Executive’s Base Salary as of the termination date (or if higher, as of immediately prior to the Change of Control), plus (B) one hundred percent
(100%) of the higher of (A) Executive’s Target Bonus as in effect for the fiscal year in which the Change of Control occurs or (B) Executive’s Target Bonus as in effect for the fiscal year in which Executive’s
termination of employment occurs. Severance payable pursuant to this Section 7(b)(i) will paid in accordance with the schedule set forth in Section 8(b). 

(ii) Continued Employee Benefits. If Executive elects continuation coverage pursuant to COBRA within the time period prescribed
pursuant to COBRA for Executive and Executive’s eligible dependents, the Company will reimburse Executive for the premiums necessary to continue group health insurance benefits for Executive and Executive’s eligible dependents until the
earlier of (A) a period of eighteen (18) months from the date of Executive’s termination of employment, (B) the date upon which Executive and/or Executive’s eligible dependents becomes covered under similar plans or
(C) the date upon which Executive ceases to be eligible for coverage under COBRA (such reimbursements, the “COC COBRA Premiums”). However, if the Company determines in its sole discretion that it cannot pay the COC COBRA
Premiums without potentially violating applicable law (including, without limitation, Section 2716 of the Public Health Service Act), the Company will in lieu thereof provide to Executive a taxable lump sum payment in an amount equal to the
monthly COBRA premium that Executive would be required to pay to continue Executive’s group health coverage in effect on the date of Executive’s termination of employment (which amount will be based on the premium for the first month of
COBRA coverage) multiplied by eighteen (18), which payment will be made regardless of whether Executive elects COBRA continuation coverage. Any such taxable lump sum payment will be paid in accordance with the schedule set forth in
Section 8(b). For the avoidance of doubt, the taxable payment in lieu of COC COBRA Premiums may be used for any purpose, including, but not limited to continuation coverage under COBRA, and will be subject to all applicable tax withholdings.
Notwithstanding anything to the contrary under this Agreement, if at any time the Company determines in its sole discretion that it cannot provide the payment contemplated by the preceding sentence without violating applicable law (including,
without limitation, Section 2716 of the Public Health Service Act), Executive will not receive such payment or any further reimbursements for COBRA premiums. 

(c) Voluntary Resignation; Termination for Cause. If Executive’s employment with the Company or its Affiliates terminates
(i) voluntarily by Executive (other than for Good Reason) or (ii) for Cause by the Company, then Executive will not be entitled to receive severance or other benefits except for those (if any) as may then be established under the
Company’s then existing severance and benefits plans and practices or pursuant to other written agreements with the Company. 
 (d)
Disability; Death. If the Company terminates Executive’s employment as a result of Executive’s Disability, or Executive’s employment terminates due to Executive’s death, then Executive will not be entitled to receive
severance or other benefits except for those (if any) as may then be established under the Company’s then existing written severance and benefits plans and practices or pursuant to other written agreements with the Company. 

  
 4 

 (e) Accrued Compensation. For the avoidance of any doubt, in the event of a termination of
Executive’s employment with the Company or its Affiliates, Executive will be entitled to receive all accrued but unpaid vacation, expense reimbursements, wages, and other benefits due to Executive under any Company-provided plans, policies, and
arrangements. 
 (f) Exclusive Remedy. In the event of a termination of Executive’s employment with the Company or its
Affiliates, the provisions of this Section 7 are intended to be and are exclusive and in lieu of any other rights or remedies to which Executive or the Company may otherwise be entitled, whether at law, tort or contract, in equity. Executive
will be entitled to no benefits, compensation or other payments or rights upon termination of employment other than those benefits expressly set forth in this Section 7. 

8. Conditions to Receipt of Severance/Timing of Severance. 

(a) Separation Agreement and Release of Claims. The receipt of any severance pursuant to Sections 7(a) or (b) will be subject to
(i) Executive resigning from all positions Executive may hold as an officer or director of the Company or any Affiliates and executing all documents the Company determines, in its sole discretion, are necessary to effectuate such resignations
prior to the Release Deadline (as defined below) (such resignation and execution of applicable documents, the “Resignations”), and (ii) Executive signing and not revoking a separation agreement and release of claims in a form
reasonably satisfactory to the Company (the “Release”) and provided that such Release becomes effective and irrevocable no later than sixty (60) days following the termination date (such deadline, the “Release
Deadline”). If the Resignations and the Release do not become effective and irrevocable by the Release Deadline, Executive will forfeit any rights to severance or benefits under this Agreement. In no event will severance payments or
benefits be paid or provided until the Resignations and the Release become effective and irrevocable. 
 (b) Timing of Severance
Payments. Provided that the Release becomes effective and irrevocable by the Release Deadline, any severance payments or benefits under this Agreement will be paid on, or, in the case of installments, will not commence until, the sixtieth
(60th) day following Executive’s separation from service, or, if later, such time as required by Section 8(c)(ii). Except as required by Section 8(c)(ii), any installment payments that would have been made to Executive during the
sixty (60) day period immediately following Executive’s separation from service but for the preceding sentence will be paid to Executive on the sixtieth (60th) day following Executive’s separation from service and the remaining
payments shall be made as provided in this Agreement. In no event will Executive have discretion to determine the taxable year of payment for any Deferred Payments. 

(c) Section 409A. 

(i) Notwithstanding anything to the contrary in this Agreement, no Deferred Payments will be paid or otherwise provided until Executive has a
“separation from service” within the meaning of Section 409A. Similarly, no severance payable to Executive, if any, pursuant to this Agreement that otherwise would be exempt from Section 409A pursuant to Treasury Regulation
Section 1.409A-1(b)(9) will be payable until Executive has a “separation from service” within the meaning of Section 409A. 

  
 5 

 (ii) Notwithstanding anything to the contrary in this Agreement, if Executive is a
“specified employee” within the meaning of Section 409A at the time of Executive’s separation from service (other than due to death), then the Deferred Payments, if any, that are payable within the first six (6) months
following Executive’s separation from service, will become payable on the first payroll date that occurs on or after the date that is six (6) months and one (1) day following the date of Executive’s separation from service. All
subsequent Deferred Payments, if any, will be payable in accordance with the payment schedule applicable to each payment or benefit. Notwithstanding anything herein to the contrary, if Executive dies following his separation from service, but prior
to the six (6) month anniversary of the separation from service, then any payments delayed in accordance with this Section 8(c)(ii) will be payable in a lump sum as soon as administratively practicable after the date of Executive’s
death and all other Deferred Payments will be payable in accordance with the payment schedule applicable to each payment or benefit. Each payment, installment and benefit payable under this Agreement is intended to constitute a separate payment for
purposes of Section 1.409A-2(b)(2) of the Treasury Regulations. 
 (iii) Any amount paid under this Agreement that satisfies the
requirements of the “short-term deferral” rule set forth in Section 1.409A-1(b)(4) of the Treasury Regulations will not constitute Deferred Payments. Any amount paid under this Agreement that qualifies as a payment made as a result of
an involuntary separation from service pursuant to Section 1.409A-1(b)(9)(iii) of the Treasury Regulations that does not exceed the Section 409A Limit (as defined below) will not constitute Deferred Payments. 

(iv) The foregoing provisions and all compensation and benefits provided for under this Agreement are intended to comply with or be exempt
from the requirements of Section 409A so that none of the severance payments and benefits to be provided hereunder will be subject to the additional tax imposed under Section 409A, and any ambiguities or ambiguous terms herein will be
interpreted to be exempt or so comply. The Company and Executive agree to work together in good faith to consider amendments to this Agreement and to take such reasonable actions which are necessary, appropriate or desirable to avoid imposition of
any additional tax or income recognition prior to actual payment to Executive under Section 409A. In no event will the Company reimburse Executive for any taxes that may be imposed on Executive as a result of Section 409A. 

(d) Proprietary Information and Inventions Agreement. Executive’s receipt of any payments or benefits under Section 7 will be
subject to Executive continuing to comply with the terms of the Proprietary Information and Inventions Agreement and the provisions of this Agreement. 

(e) No Duty to Mitigate. Executive will not be required to mitigate the amount of any payment contemplated by this Agreement, nor will
any earnings that Executive may receive from any other source reduce any such payment 
 9. Limitation on Payments. In the event that
the severance and other benefits provided for in this Agreement or otherwise payable to Executive (i) constitute “parachute payments” within the meaning of Section 280G of the Internal Revenue Code of 1986, as amended (the
“Code”) and (ii) but for this Section 9, would be subject to the excise tax imposed by Section 4999 of the Code, then Executive’s severance benefits under Section 7 will be either: 

  
 6 

 (a) delivered in full, or 

(b) delivered as to such lesser extent which would result in no portion of such severance benefits being subject to excise tax under
Section 4999 of the Code, whichever of the foregoing amounts, taking into account the applicable federal, state and local income taxes and the excise tax imposed by Section 4999 of the Code, results in the receipt by Executive on an
after-tax basis, of the greatest amount of severance benefits, notwithstanding that all or some portion of such severance benefits may be taxable under Section 4999 of the Code. If a reduction in severance and other benefits constituting
“parachute payments” is necessary so that benefits are delivered to a lesser extent, reduction will occur in the following order: (i) reduction of cash payments, which shall occur in reverse chronological order such that the cash
payment owed on the latest date following the occurrence of the event triggering such excise tax will be the first cash payment to be reduced; (ii) reduction of acceleration of vesting of Equity Awards, which shall occur in the reverse order of
the date of grant for such Equity Awards (i.e., the vesting of the most recently granted Equity Awards will be reduced first); and (iii) reduction of other benefits paid or provided to Executive, which will occur in reverse chronological order
such that the benefit owed on the latest date following the occurrence of the event triggering such excise tax will be the first benefit to be reduced. If more than one Equity Award was made to Executive on the same date of grant, all such awards
shall have their acceleration of vesting reduced pro rata. In no event will Executive have any discretion with respect to the ordering of payment reductions. 

Unless the Company and Executive otherwise agree in writing, any determination required under this Section 9 will be made in writing by a
nationally recognized firm of independent public accountants selected by the Company (the “Accountants”), whose determination will be conclusive and binding upon Executive and the Company for all purposes. For purposes of making the
calculations required by this Section 9, the Accountants may make reasonable assumptions and approximations concerning applicable taxes and may rely on reasonable, good faith interpretations concerning the application of Sections 280G and 4999
of the Code. The Company and Executive will furnish to the Accountants such information and documents as the Accountants may reasonably request in order to make a determination under this Section. The Company will bear all costs the Accountants may
reasonably incur in connection with any calculations contemplated by this Section 9. 
 10. Definition of Terms. The following
terms referred to in this Agreement will have the following meanings: 
 (a) Affiliate. “Affiliate” means the
Company and any other parent or subsidiary corporation of the Company, as such terms are defined in Section 424(e) and (1) of the Code. 

(b) Cause. “Cause” means (i) Executive’s dishonest statements or acts with respect to the Company or any
Affiliate to any governmental regulatory agency or authority; (ii) Executive’s commission of any felony or commission of any crime involving fraud, dishonesty or moral turpitude; (iii) Executive’s commission or attempted
commission of or participation in a fraud or act of dishonesty against the Company; (iv) Executive’s material breach of any contract or agreement between Executive and the Company or Executive’s material breach of any legal duty he
owes to the Company; (v) conduct by Executive that constitutes insubordination, incompetence or 

  
 7 

 
neglect of duties; or (vi) Executive’s failure to perform the duties, functions and responsibilities of Executive’s position; provided, however, the actions or conduct described in
clauses (iv), (v) and (vi) above will only constitute Cause if the Company provides Executive with written notice thereof and Executive has not cured within thirty (30) days of such written notice. 

(c) Change of Control. “Change of Control” means the occurrence of any of the following events: 

(i) A change in the ownership of the Company which occurs on the date that any one person, or more than one person acting as a group
(“Person”), acquires ownership of the stock of the Company that, together with the stock held by such Person, constitutes more than 50% of the total voting power of the stock of the Company; provided, however, that for purposes
of this subsection, the acquisition of additional stock by any one Person, who is considered to own more than 50% of the total voting power of the stock of the Company will not be considered a Change of Control. Further, if the stockholders of
the Company immediately before such change in ownership continue to retain immediately after the change in ownership, in substantially the same proportions as their ownership of shares of the Company’s voting stock immediately prior to the
change in ownership, direct or indirect beneficial ownership of 50% or more of the total voting power of the stock of the Company or of the ultimate parent entity of the Company, such event shall not be considered a Change of Control under this
subsection (i). For this purpose, indirect beneficial ownership shall include, without limitation, an interest resulting from ownership of the voting securities of one or more corporations or other business entities which own the Company, as the
case may be, either directly or through one or more subsidiary corporations or other business entities; or 
 (ii) A change in the
effective control of the Company which occurs on the date that a majority of members of the Board is replaced during any 12-month period by Directors whose appointment or election is not endorsed by a majority of the members of the Board prior to
the date of the appointment or election. For purposes of this subsection (ii), if any Person is considered to be in effective control of the Company, the acquisition of additional control of the Company by the same Person will not be considered a
Change of Control; or 
 (iii) A change in the ownership of a substantial portion of the Company’s assets which occurs on the date
that any Person acquires (or has acquired during the 12-month period ending on the date of the most recent acquisition by such person or persons) assets from the Company that have a total gross fair market value equal to or more than
50% of the total gross fair market value of all of the assets of the Company immediately prior to such acquisition or acquisitions; provided, however, that for purposes of this subsection (iii), the following will not constitute a change in the
ownership of a substantial portion of the Company’s assets: (A) a transfer to an entity that is controlled by the Company’s stockholders immediately after the transfer, or (B) a transfer of assets by the Company to: (1) a
stockholder of the Company (immediately before the asset transfer) in exchange for or with respect to the Company’s stock, (2) an entity, 50% or more of the total value or voting power of which is owned, directly or indirectly,
by the Company, (3) a Person, that owns, directly or indirectly, 50% or more of the total value or voting power of all the outstanding stock of the Company, or (4) an entity, at least 50% of the total value or voting power of
which is owned, directly or indirectly, by a Person described in this subsection (iii)(B)(3). For purposes of this subsection (iii), gross fair market value means the value of the assets of the Company, or the value of the assets being disposed of,
determined without regard to any liabilities associated with such assets. 

  
 8 

 For purposes of this definition, Persons will be considered to be acting as a group if they are
owners of a corporation that enters into a merger, consolidation, purchase or acquisition of stock, or similar business transaction with the Company. 

Notwithstanding the foregoing, a transaction will not be deemed a Change of Control unless the transaction qualifies as a change in control
event within the meaning of Code Section 409A, as it has been and may be amended from time to time, and any proposed or final Treasury Regulations and Internal Revenue Service guidance that has been promulgated or may be promulgated thereunder
from time to time. 
 Further and for the avoidance of doubt, a transaction will not constitute a Change of Control if: (i) its sole
purpose is to change the state of the Company’s incorporation, or (ii) its sole purpose is to create a holding company that will be owned in substantially the same proportions by the Persons who held the Company’s securities
immediately before such transaction. 
 (d) Change of Control Period. “Change of Control Period” means the twelve
(12) months period commencing immediately following the date of the first Change of Control to occur after the Effective Date. 
 (e)
Code. “Code” means the Internal Revenue Code of 1986, as amended. 
 (f) Deferred Payment. “Deferred
Payment” means any severance pay or benefits to be paid or provided to Executive (or Executive’s estate or beneficiaries) pursuant to this Agreement and any other severance payments or separation benefits, that in each case, when
considered together, are considered deferred compensation under Section 409A. 
 (g) Disability. “Disability”
means that the Employee has been unable to perform Executive’s Company duties as the result of Executive’s incapacity due to physical or mental illness, and such inability, at least twenty-six (26) weeks after its commencement or 180
days in any consecutive twelve (12) month period, is determined to be total and permanent by a physician selected by the Company or its insurers and acceptable to Executive or Executive’s legal representative (such agreement as to
acceptability not to be unreasonably withheld). Termination resulting from Disability may only be effected after at least thirty (30) days’ written notice by the Company of its intention to terminate the Employee’s employment. In the
event that the Employee resumes the performance of substantially all of Executive’s duties hereunder before the termination of Executive’s employment becomes effective, the notice of intent to terminate will automatically be deemed to have
been revoked. 
 (h) Equity Awards. “Equity Awards” means Executive’s outstanding stock options, stock
appreciation rights, restricted stock, restricted stock units, performance shares, performance stock units and any other Company equity compensation awards. 

(i) Good Reason. “Good Reason” means Executive’s resignation within thirty (30) days following the
expiration of any Company cure period (discussed below) following the occurrence of one or more of the following, without Executive’s consent: (i) a material reduction in 

  
 9 

 
Executive’s Base Salary, excluding the substitution of substantially equivalent compensation and benefits, that is applicable to all Company senior management; (ii) a material reduction
of Executive’s authority, duties or responsibilities, unless Executive is provided with a comparable position; provided, however, that a reduction in authority, duties, or responsibilities solely by virtue of the Company being acquired and made
part of a larger entity whether as a subsidiary, business unit or otherwise (as, for example, when the Chief Executive Officer of the Company remains as such following an acquisition where the Company becomes a wholly owned subsidiary of the
acquirer, but is not made the Chief Executive Officer of the acquiring corporation) will not constitute “Good Reason”; or (iii) a material change in the geographic location of Executive’s primary work facility or location;
provided, that a relocation of fifty (50) miles or less from Executive’s then present location or to Executive’s home as his primary work location will not be considered a material change in geographic location. In order for an event
to qualify as Good Reason, Executive must not terminate employment with the Company without first providing the Company with written notice of the acts or omissions constituting the grounds for “Good Reason” within ninety (90) days of
the initial existence of the grounds for “Good Reason” and a reasonable cure period of not less than thirty (30) days following the date of such notice, and such grounds must not have been cured during such time. 

(j) Proprietary Information and Inventions Agreement. “Proprietary Information and Inventions Agreement” means the At
Will Employment, Confidential Information, Invention Assignment, and Arbitration Agreement dated as of the date hereof executed by the Company and Executive. 

(k) Section 409A. “Section 409A” means Section 409A of the Code and any final regulations and guidance
thereunder and any applicable state law equivalent, as each may be amended or promulgated from time to time. 
 (l) Section 409A
Limit. “Section 409A Limit” will mean two (2) times the lesser of: (i) Executive’s annualized compensation based upon the annual rate of pay paid to Executive during the Executive’s taxable year preceding the
Executive’s taxable year of Executive’s separation from service as determined under Treasury Regulation Section 1.409A-1(b)(9)(iii)(A)(1) and any Internal Revenue Service guidance issued with respect thereto; or (ii) the maximum
amount that may be taken into account under a qualified plan pursuant to Section 401(a)(17) of the Internal Revenue Code for the year in which Executive’s separation from service occurred. 

11. Confidential Information. Executive confirms his continuing obligations under the Proprietary Information and Inventions Agreement.

 12. Assignment. This Agreement will be binding upon and inure to the benefit of (a) the heirs, executors and legal
representatives of Executive upon Executive’s death and (b) any successor of the Company. Any such successor of the Company will be deemed substituted for the Company under the terms of this Agreement for all purposes. For this purpose,
“successor” means any person, firm, corporation or other business entity which at any time, whether by purchase, merger or otherwise, directly or indirectly acquires all or substantially all of the assets or business of the Company. None
of the rights of Executive to receive any form of compensation payable pursuant to this Agreement may be assigned or transferred except by will or the laws of descent and distribution. 

  
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Any other attempted assignment, transfer, conveyance or other disposition of Executive’s right to compensation or other benefits will be null and void. 

13. Notices. All notices, requests, demands and other communications called for hereunder will be in writing and will be deemed given
(i) on the date of delivery if delivered personally, (ii) one (1) day after being sent by a well established commercial overnight service, or (iii) four (4) days after being mailed by registered or certified mail, return
receipt requested, prepaid and addressed to the parties or their successors at the following addresses, or at such other addresses as the parties may later designate in writing: 

If to the Company: 

MultiVir Inc. 

Attn: Chief Executive Officer 

410 Pierce Street, Suite 325 

Houston, TX 77002 

If to Executive: 

at the last residential address known by the Company. 

14. Severability. In the event that any provision hereof becomes or is declared by a court of competent jurisdiction to be illegal,
unenforceable or void, this Agreement will continue in full force and effect without said provision. 
 15. Integration. This
Agreement and the Proprietary Information and Inventions Agreement represents the entire agreement and understanding between the parties as to the subject matter herein and supersedes all prior or contemporaneous agreements whether written or oral,
including, but not limited to, the Consulting Retainer Letter Agreement entered into between the parties, dated April 2, 2014 and the undated Employment Agreement entered into between the parties, on or around April 2014. This Agreement may be
modified only by agreement of the parties by a written instrument executed by the parties that is designated as an amendment to this Agreement. 

16. Waiver of Breach. The waiver of a breach of any term or provision of this Agreement, which must be in writing, will not operate as
or be construed to be a waiver of any other previous or subsequent breach of this Agreement. 
 17. Headings. All captions and
section headings used in this Agreement are for convenient reference only and do not form a part of this Agreement. 
 18. Tax
Withholding. All payments made pursuant to this Agreement will be subject to withholding of applicable taxes. 
 19. Arbitration.
Any dispute or controversy arising out of or relating to any interpretation, construction, performance or breach of the Agreement or the Proprietary Information and Inventions Agreement, will be settled by arbitration pursuant to the arbitration
provisions set forth in the Proprietary Information and Inventions Agreement. 

  
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 20. Governing Law. This Agreement will be governed by the laws of the State of Texas (with
the exception of its conflict of laws provisions). 
 21. Acknowledgment. Executive acknowledges that he has had the opportunity to
discuss this matter with and obtain advice from his private attorney, has had sufficient time to, and has carefully read and fully understands all the provisions of this Agreement, and is knowingly and voluntarily entering into this Agreement. 

22. Gender Neutral. Wherever used herein, a pronoun in the masculine gender will be considered as including the feminine gender unless
the context clearly indicates otherwise. 
 23. Counterparts. This Agreement may be executed in counterparts, and each counterpart
will have the same force and effect as an original and will constitute an effective, binding agreement on the part of each of the undersigned. 

  
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 IN WITNESS WHEREOF, each of the parties has executed this Agreement, in the case of the Company
by their duly authorized officers, as of the day and year set forth below. 
  

									
	COMPANY:						
				
	MULTIVIR INC.						
					
	By:		/s/ Robert E. Sobol				Date:		March 3, 2015
	Title:  Chief Executive Officer						
				
	EXECUTIVE:						
				
	/s/ Nicholas Puro				Date:		March 3, 2015
	NICHOLAS PURO, JD						

 [SIGNATURE PAGE TO EXECUTIVE EMPLOYMENT AGREEMENT] 

  
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