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Exhibit 10.31  

 SONTRA MEDICAL, INC.  

 
  1999 Stock Option and Incentive Plan    
  

1.    Purpose and Eligibility  

        The purpose of this 1999 Stock Option and Incentive Plan (the "Plan") of Sontra Medical, Inc. (the
"Company") is to provide stock options and other equity interests in the Company (each an "Award") to
employees, officers, directors, consultants and advisors of the Company and its Subsidiaries, all of whom are eligible to receive Awards under the Plan. Any person to whom an Award has been granted
under the Plan is called a "Participant". Additional definitions are contained in Section 8. 

2.    Administration  

        a.    Administration by Board of Directors.    The Plan will be administered by the Board of Directors of the Company
(the "Board"). The Board, in its sole discretion, shall have the authority to grant and amend Awards, to adopt, amend and repeal rules relating to the
Plan and to interpret and correct the provisions of the Plan and any Award. All decisions by the Board shall be final and binding on all interested persons. Neither the Company nor any member of the
Board shall be liable for any action or determination relating to the Plan. 

        b.    Appointment of Committees.    To the extent permitted by applicable law, the Board may delegate any or all of
its powers under the Plan to one or more committees or subcommittees of the Board (a "Committee"). All references in the Plan to the
"Board" shall mean such Committee or the Board. 

        c.    Delegation to Executive Officers.    To the extent permitted by applicable law, the Board may delegate to one or
more executive officers of the Company the power to grant Awards and exercise such other powers under the Plan as the Board may determine, provided that
the Board shall fix the maximum number of Awards to be granted and the maximum number of shares issuable to any one Participant pursuant to Awards granted by such executive officers. 

3.    Stock Available for Awards  

        a.    Number of Shares.    Subject to adjustment under Section 3(c), the aggregate number of shares of Common
Stock of the Company (the "Common Stock") that may be issued pursuant to the Plan is 4,600,000 shares. If any Award expires, or is terminated,
surrendered or forfeited, in whole or in part, the unissued Common Stock covered by such Award shall again be available for the grant of Awards under the Plan. If shares of Common Stock issued
pursuant to the Plan are repurchased by, or are surrendered or forfeited to, the Company at no more than cost, such shares of Common Stock shall again be available for the grant of Awards under the
Plan; provided, however, that the cumulative number of such shares that may be so reissued under the Plan will not exceed 4,600,000 shares. Shares
issued under the Plan may consist in whole or in part of authorized but unissued shares or treasury shares. 

        b.    Per-Participant Limit.    Subject to adjustment under Section 3(c), no Participant may be granted Awards
during any one fiscal year to purchase more than 500,000 shares of Common Stock. 

        c.    Adjustment to Common Stock.    In the event of any stock split, stock dividend, extraordinary cash dividend,
recapitalization, reorganization, merger, consolidation, combination, exchange of shares, liquidation, spin-off, split-up, or other similar change in capitalization or event,
(i) the number and class of securities available for Awards under the Plan and the per-Participant share limit, (ii) the number and class of securities, vesting schedule and
exercise price per share subject to each outstanding Option, (iii) the repurchase price per security subject to repurchase, and (iv) the terms of each other outstanding stock-based Award
shall be adjusted by the Company (or substituted Awards may be made) to the extent the Board shall determine, in good faith, that such an adjustment (or substitution) is appropriate. If
Section 7(e)(i) applies for any event, this Section 3(c) shall not be applicable. 

 

4.    Stock Options  

        a.    General.    The Board may grant options to purchase Common Stock (each, an
"Option") and determine the number of shares of Common Stock to be covered by each Option, the exercise price of each Option and the conditions and
limitations applicable to the exercise of each Option and the Common Stock issued upon the exercise of each Option, including vesting provisions, repurchase provisions and restrictions relating to
applicable federal or state securities laws, as it considers advisable. 

        b.    Incentive Stock Options.    An Option that the Board intends to be an "incentive stock
option" as defined in Section 422 of the Code (an "Incentive Stock Option") shall be granted only to employees of the
Company and shall be subject to and shall be construed consistently with the requirements of Section 422 of the Code. The Board and the Company shall have no liability if an Option or any part
thereof that is intended to be an Incentive Stock Option does not qualify as such. An Option or any part thereof that does not qualify as an Incentive Stock Option is referred to herein as a
"Nonstatutory Stock Option". 

        c.    Exercise Price.    The Board shall establish the exercise price (or determine the method by which the exercise
price shall be determined) at the time each Option is granted and specify it in the applicable option agreement. 

        d.    Duration of Options.    Each Option shall be exercisable at such times and subject to such terms and conditions
as the Board may specify in the applicable option agreement. 

        e.    Exercise of Option.    Options may be exercised only by delivery to the Company of a written notice of exercise
signed by the proper person together with payment in full as specified in Section 4(f) for the number of shares for which the Option is exercised. 

        f.    Payment Upon Exercise.    Common Stock purchased upon the exercise of an Option shall be paid for by one or any
combination of the following forms of payment: 

	(i)
	by
check payable to the order of the Company; 
	(ii)
	except
as otherwise explicitly provided in the applicable option agreement, and only if the Common Stock is then publicly traded, delivery of an
irrevocable and unconditional undertaking by a creditworthy broker to deliver promptly to the Company sufficient funds to pay the exercise price, or delivery by the Participant to the Company of a
copy of irrevocable and unconditional instructions to a creditworthy broker to deliver promptly to the Company cash or a check sufficient to pay the exercise price; or 
	(iii)
	to
the extent explicitly provided in the applicable option agreement, by (x) delivery of shares of Common Stock owned by the Participant valued
at fair market value (as determined by the Board or as determined pursuant to the applicable option agreement), (y) delivery of a promissory note of the Participant to the Company (and delivery
to the Company by the Participant of a check in an amount equal to the par value of the shares purchased), or (z) payment of such other lawful consideration as the Board may determine. 

5.    Restricted Stock  

        a.    Grants.    The Board may grant Awards entitling recipients to acquire shares of Common Stock, subject to
(i) delivery to the Company by the Participant of a check in an amount at least equal to the par value of the shares purchased, and (ii) the right of the Company to repurchase all or
part of such shares at their issue price or other stated or formula price from the Participant in the event that conditions specified by the Board in the applicable Award are not satisfied prior to
the end of the applicable restriction period or periods established by the Board for such Award (each, a "Restricted Stock Award"). 

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        b.    Terms and Conditions    The Board shall determine the terms and conditions of any such Restricted Stock Award.
Any stock certificates issued in respect of a Restricted Stock Award shall be registered in the name of the Participant and, unless otherwise determined by the Board, deposited by the Participant,
together with a stock power endorsed in blank, with the Company (or its designee). After
the expiration of the applicable restriction periods, the Company (or such designee) shall deliver the certificates no longer subject to such restrictions to the Participant or, if the Participant has
died, to the beneficiary designated by a Participant, in a manner determined by the Board, to receive amounts due or exercise rights of the Participant in the event of the Participant's death (the
"Designated Beneficiary"). In the absence of an effective designation by a Participant, Designated Beneficiary shall mean the Participant's estate. 

6.    Other Stock-Based Awards  

        The Board shall have the right to grant other Awards based upon the Common Stock having such terms and conditions as the Board may determine, including, without
limitation, the grant of shares based upon certain conditions, the grant of securities convertible into Common Stock and the grant of stock appreciation rights, phantom stock awards or stock units. 

7.    General Provisions Applicable to Awards  

        a.    Transferability of Awards.    Except as the Board may otherwise determine or provide in an Award, Awards shall
not be sold, assigned, transferred, pledged or otherwise encumbered by the person to whom they are granted, either voluntarily or by operation of law, except by will or the laws of descent and
distribution, and, during the life of the Participant, shall be exercisable only by the Participant. References to a Participant, to the extent relevant in the context, shall include references to
authorized transferees. 

        b.    Documentation.    Each Award under the Plan shall be evidenced by a written instrument in such form as the Board
shall determine or as executed by an officer of the Company pursuant to authority delegated by the Board. Each Award may contain terms and conditions in addition to those set forth in the Plan  provided that such terms and conditions do not contravene the provisions of the Plan. 

        c.    Board Discretion.    The terms of each type of Award need not be identical, and the Board need not treat
Participants uniformly. 

        d.    Termination of Status.    The Board shall determine the effect on an Award of the disability, death, retirement,
authorized leave of absence or other change in the employment or other status of a Participant and the extent to which, and the period during which, the Participant, or the Participant's legal
representative, conservator, guardian or Designated Beneficiary, may exercise rights under the Award. 

        e.    Acquisition of the Company    

	(i)
	Upon
the occurrence of an Acquisition: (x) all outstanding Options shall become exercisable in full immediately prior to the consummation of the
Acquisition; if the shares of Common Stock subject to such Options are subject to repurchase provisions, then such repurchase restrictions shall lapse upon the consummation of the Acquisition; and all
outstanding Options shall remain the obligation of the Company or be assumed by the surviving or acquiring entity, and there shall be automatically substituted for the shares of Common Stock then
subject to such Options the consideration payable with respect to the outstanding shares of Common Stock in connection with the Acquisition; (y) all Restricted Stock Awards then outstanding
shall become immediately free of all repurchase provisions upon the consummation of the Acquisition; and (z) all other stock-based Awards shall become immediately exercisable, realizable or
vested in full, or shall be immediately free of all repurchase provisions, as the case may be, upon the consummation of the Acquisition. 

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	(ii)
	Acquisition Defined. An "Acquisition" shall mean:
(x) any merger or consolidation after which the voting securities of the Company outstanding immediately prior thereto represent (either by remaining outstanding or by being converted into
voting securities of the surviving or acquiring entity) less than 50% of the combined voting power of the voting securities of the Company or such surviving or acquiring entity outstanding immediately
after such event; or (y) any sale of all or substantially all of the assets or capital stock of the Company (other than in a spin-off or similar transaction) or (z) any other
acquisition of the business of the Company, as determined by the Board. 
	(iii)
	Assumption of Options Upon Certain Events. In connection with a merger or consolidation
of an entity
with the Company or the acquisition by the Company of property or stock of an entity, the Board may grant Awards under the Plan in substitution for stock and stock-based awards issued by such entity
or an affiliate thereof. The substitute Awards shall be granted on such terms and conditions as the Board considers appropriate in the circumstances. 
	(iv)
	Pooling-of
Interests-Accounting. If the Company proposes to engage in an Acquisition
intended to be accounted for as a pooling-of-interests, and in the event that the provisions of this Plan or of any Award hereunder, or any actions of the Board taken in
connection with such Acquisition, are determined by the Company's or the acquiring company's independent public accountants to cause such Acquisition to fail to be accounted for as a
pooling-of-interests, then such provisions or actions shall be amended or rescinded by the Board, without the consent of any Participant, to be consistent with
pooling-of-interests accounting treatment for such Acquisition. 
	(v)
	Parachute Awards. Notwithstanding the provisions of Section 7(e)(i)(A), if, in connection
with an
Acquisition described therein, a tax under Section 4999 of the Code would be imposed on the
Participant (after taking into account the exceptions set forth in Sections 280G(b)(4) and 280G(b)(5) of the Code), then the number of Awards which shall become exercisable, realizable or vested as
provided in such section shall be reduced (or delayed), to the minimum extent necessary, so that no such tax would be imposed on the Participant (the Awards not becoming so accelerated, realizable or
vested, the "Parachute Awards"); provided, however, that if the "aggregate
present value" of the Parachute Awards would exceed the tax that, but for this sentence, would be imposed on the Participant under Section 4999 of the Code in connection
with the Acquisition, then the Awards shall become immediately exercisable, realizable and vested without regard to the provisions of this sentence. For purposes of the preceding sentence, the
"aggregate present value" of an Award shall be calculated on an after-tax basis (other than taxes imposed by Section 4999 of the
Code) and shall be based on economic principles rather than the principles set forth under Section 280G of the Code and the regulations promulgated thereunder. All determinations required to be
made under this Section 7(e)(iv) shall be made by the Company. 

        f.    Withholding.    Each Participant shall pay to the Company, or make provisions satisfactory to the Company for
payment of, any taxes required by law to be withheld in connection with Awards to such Participant no later than the date of the event creating the tax liability. The Board may allow Participants to
satisfy such tax obligations in whole or in part by transferring shares of Common Stock, including shares retained from the Award creating the tax obligation, valued at their fair market value (as
determined by the Board or as determined pursuant to the applicable option agreement). The Company may, to the extent permitted by law, deduct any such tax obligations from any payment of any kind
otherwise due to a Participant. 

        g.    Amendment of Awards.    The Board may amend, modify or terminate any outstanding Award including, but not
limited to, substituting therefor another Award of the same or a different type, 

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changing the date of exercise or realization, and converting an Incentive Stock Option to a Nonstatutory Stock Option, provided that, except as
otherwise provided in Section 7(e)(iii), the Participant's consent to such action shall be required unless the Board determines that the action, taking into account any related action, would
not materially and adversely affect the Participant. 

        h.    Conditions on Delivery of Stock.    The Company will not be obligated to deliver any shares of Common Stock
pursuant to the Plan or to remove restrictions from shares previously delivered under the Plan until (i) all conditions of the Award have been met or removed to the satisfaction of the Company,
(ii) in the opinion of the Company's counsel, all other legal matters in connection with the issuance and delivery of such shares have been satisfied, including any applicable securities laws
and any applicable stock exchange or stock market rules and regulations, and (iii) the Participant has executed and delivered to the Company such representations or agreements as the Company
may consider appropriate to satisfy the requirements of any applicable laws, rules or regulations. 

        i.    Acceleration.    The Board may at any time provide that any Options shall become immediately exercisable in full
or in part, that any Restricted Stock Awards shall be free of some or all restrictions, or that any other stock-based Awards may become exercisable in full or in part or free of some or all
restrictions or conditions, or otherwise realizable in full or in part, as the case may be, despite the fact
that the foregoing actions may (i) cause the application of Sections 280G and 4999 of the Code if a change in control of the Company occurs, or (ii) disqualify all or part of the Option
as an Incentive Stock Option. 

8.    Miscellaneous  

        a.    Definitions.    

	(i)
	"Company," for purposes of eligibility under the Plan, shall include any present or future subsidiary
corporations of Sontra Medical, Inc., as defined in Section 424(f) of the Code (a "Subsidiary"), and any present or future parent
corporation of Sontra Medical, Inc., as defined in Section 424(e) of the Code. For purposes of Awards other than Incentive Stock Options, the term
"Company" shall include any other business venture in which the Company has a direct or indirect significant interest, as determined by the Board in its
sole discretion. 
	(ii)
	"Code" means the Internal Revenue Code of 1986, as amended, and any regulations promulgated thereunder. 
	(iii)
	"employee" for purposes of eligibility under the Plan shall include a person to whom an offer of
employment has been extended by the Company. 

        b.    No Right To Employment or Other Status.    No person shall have any claim or right to be granted an Award, and
the grant of an Award shall not be construed as giving a Participant the right to continued employment or any other relationship with the Company. The Company expressly reserves the right at any time
to dismiss or otherwise terminate its relationship with a Participant free from any liability or claim under the Plan. 

        c.    No Rights As Stockholder.    Subject to the provisions of the applicable Award, no Participant or Designated
Beneficiary shall have any rights as a stockholder with respect to any shares of Common Stock to be distributed with respect to an Award until becoming the record holder thereof. 

        d.    Effective Date and Term of Plan.    The Plan shall become effective on the date on which it is adopted by the
Board. No Awards shall be granted under the Plan after the completion of ten years from the date on which the Plan was adopted by the Board, but Awards previously granted may extend beyond that date. 

        e.    Amendment of Plan.    The Board may amend, suspend or terminate the Plan or any portion thereof at any time. 

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        f.    Governing Law.    The provisions of the Plan and all Awards made hereunder shall be governed by and interpreted
in accordance with the laws of the State of Delaware, without regard to any applicable conflicts of law. 

Adopted
by the Board of Directors on

July 14, 1999 

Approved
by the stockholders on

September    , 1999 

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Exhibit 10.32  

  
 

    EMPLOYMENT AGREEMENT    
  

        This Employment Agreement is made as of May 23, 2001, by and between James R. McNab, Jr. (the "Executive") and Sontra Medical, Inc. (the "Company"). 

        WHEREAS, the Company desires to employ the Executive, and the Executive desires to be employed by the Company on the terms specified
herein; and 

        WHEREAS, the Executive's senior managerial position requires that he be trusted with extensive confidential information and trade secrets
of the Company and that he develop a thorough and comprehensive knowledge of all details of the Company's business, including, but not limited to, information relating to research, development,
inventions, purchasing, accounting, marketing, distribution and licensing of the Company's products and services; 

        NOW, THEREFORE, in consideration of the foregoing and the agreements herein contained, and intending to be legally bound, the parties
hereby agree as follows: 

        1.    Position and Responsibilities.    The Executive agrees to serve as President and Chairman of the Board of
Directors for the Company. The Executive shall at all times report to, and his activities shall at all times be subject to the direction and control of the Board of Directors of the Company, and the
Executive shall exercise such powers and comply with and perform, faithfully and to the best of his ability, such directions and duties in relation to the business and affairs of the Company as may
from time to time be vested in or requested of him. The Executive shall have such duties as may be assigned to the Executive from time to time by the Board of Directors. 

        2.    Term.    The parties agree that the Executive's employment with the Company shall be on an "at-will"
basis, which means that either the Executive or the Company may terminate the employment relationship and this Agreement at any time, for any or no reason, with or without Cause (as defined below),
with or without prior notice to the other party, but subject to Section 4 hereof. 

        3.    Compensation and Benefits.    As compensation for the satisfactory performance by the Executive of his duties
and obligations hereunder to the Company and subject to the provisions of Section 4, the Executive shall receive: 

        3.1.    Base Salary.    The Executive's initial salary shall be paid at a rate of Ten Thousand Dollars ($10,000) per
month (the "Base Salary"). The Base Salary shall be payable in accordance with the customary payroll practices of the Company as may be established or
modified from time to time. The Board of Directors in its sole discretion may adjust the Executive's salary at any time. All payments shall be subject to all applicable federal, state and/or local
payroll and withholding taxes. 

        3.2.    Benefits.    During Executive's employment, and subject to any contribution generally required of executives
of the Company, the Executive shall be eligible to participate in all employee health and benefits plans, as may be from time to time adopted by the Company and in effect for executives of the Company
in similar positions. Executive's participation shall be subject to (i) the terms of the applicable plan documents, (ii) generally applicable Company policies, and (iii) the
discretion of the Board or any administrative or other committee provided for in, or contemplated by, such plan. In addition, the Executive shall be entitled to receive three weeks vacation, which
shall be accrued and utilized in accordance with the Company's vacation policy/practice as established and/or modified from time to time. 

        The
Company's plans and policies shall govern all other benefits. The Company and/or the Board of Directors may alter, modify, add to, or delete its employee benefits plans and policies
at any time as the Company and/or the Board of Directors, in its or their sole judgment, determines to be appropriate. 

        3.3.    Business Expenses.    The Company shall pay or reimburse the Executive for all reasonable business expenses
incurred or paid by the Executive in the performance of his 

 

duties and responsibilities hereunder, subject to (i) any reasonable expense policy of the Company, as set by the Company and/or the Board of Directors from time to time and generally
applicable to executives of the Company in similar positions, and (ii) such reasonable substantiation and documentation requirements as may be specified by the Company and/or Board of Directors
from time to time. 

        4.    Termination of Employment.    The Executive's employment and this Agreement shall terminate under the following
circumstances: 

        4.1.    Death or Disability.    In the event of the Executive's death or Disability (as defined herein) during the
Executive's employment hereunder, the Executive's employment and this Agreement shall immediately and automatically terminate, and the Company shall pay to the Executive (or in the case of death, the
Executive's designated beneficiary or, if no beneficiary has been designated by the Executive, his estate), any Base Salary earned but unpaid through the date of death or Disability. For the purposes
of this Agreement, "Disability" shall mean any physical incapacity or mental incompetence (i) as a result of which the Executive is unable to
perform the essential functions of his job for an aggregate of 90 days, whether or not consecutive, during any calendar year, and (ii) which cannot be reasonably accommodated by the
Company without undue hardship. 

        4.2.    By the Company for Cause.    

        (a)  The
Company may terminate the Executive's employment and this Agreement for Cause at any time. Upon termination for Cause, the Company shall have no further obligation
or liability to the Executive relating to the Executive's employment or this Agreement, other than any Base Salary earned but unpaid and accrued but unused vacation through the date of termination. 

        (b)  The
following events or conditions shall constitute "Cause" for termination of Executive's employment and this Agreement:
(i) disregard of or failure to follow any written rules or policies of the Company; (ii) failure or refusal of the Executive to perform his duties hereunder; (iii) dishonesty,
embezzlement, misappropriation of assets or property (tangible or intangible) of the Company, gross negligence, misconduct, neglect of duties, theft, fraud, or breach of fiduciary duty to the Company;
(iv) violation of federal or state securities laws; (v) breach of an employment, consulting or other agreement (including, without limitation, the Employee Non-competition,
Nondisclosure and Developments Agreement between the Executive and the Company); (vi) the unauthorized disclosure of any trade secret or confidential information of the Company, including
confidential information of third parties which the Company treats as confidential; (vii) the commission of an act which constitutes unfair competition with the Company or which induces any
customer or supplier to breach a contract with the Company; or (viii) the commission of a felony. 

        (c)  If
the Board of Directors, in its sole discretion, determines that the reason(s) constituting Cause for termination is subject to cure, then the Executive shall be given
written notice of the pending termination, notice of the action required by the Executive to cure the circumstances constituting Cause, and thirty days in which to attempt to cure. If in the Board of
Directors' determination, the reason(s) constituting Cause has been cured, then Executive's employment shall not be terminated. If, however, the Board of Directors determines, in its sole discretion,
that the reason(s) has not been cured in the thirty day period, Executive's employment shall be subject to immediate termination for Cause. 

        4.3    By the Company other than for Cause.    

        (a)  The
Company may terminate the Executive's employment and this Agreement other than for Cause at any time. In the event of such termination, it is agreed by and between
the Company and the Executive that they will enter into an independent consulting agreement— 

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the terms of which will be subject to negotiation at such time as the Executive's employment is terminated under this provision. At a minimum, the parties agree that the independent consulting
agreement will provide for payment of $10,000 per month for consulting services for a term of twelve months. Upon execution of an independent consulting agreement with Executive, the Company shall
have no further obligation or liability to the Executive relating to his employment or this Agreement, other than any Base Salary earned but unpaid and accrued but unused vacation through the date of
termination. 

        (b)  Should
the Company elect not to enter into such an independent consulting agreement with the Executive, the Executive will be entitled to salary continuation at the Base
Salary rate for a period of six months from the termination date, to be paid in accordance with the Company's payroll practice then in effect. If the Executive elects to continue medical insurance
coverage after the termination date in accordance with the provisions of the Consolidated Omnibus Reconciliation Act of 1985 ("COBRA"), then the Company
shall pay his monthly COBRA premium payments for the period of salary continuation payments or until he accepts other employment, whichever occurs first. The Company shall have no other obligations to
the Executive upon termination of employment other than for Cause. The Company's obligation to provide any of the amounts and benefits hereunder shall be subject to, and conditioned upon, the
Executive's execution of a full release of claims satisfactory to the Company, releasing the Company and its employees and agents from any claims arising from or related to the Executive's employment
or severance from employment with the Company, including any claims arising from this Agreement. 

        (c)  Should
the Company and Executive, despite good-faith negotiations, fail to reach agreement on a consulting agreement within thirty days of Executive's
termination from employment, unless the thirty day period is otherwise extended in writing by the Company, the Company, provided it has offered a consulting agreement specifying payment of $10,000 per
month for consulting services for a term of twelve months, shall have no further obligation or liability to the Executive relating to his employment or this Agreement, other than any Base Salary
earned but unpaid and accrued but unused vacation through the date of termination. 

        4.4    By the Executive.    If the Executive chooses to terminate his employment with the Company for any reason other
than to transition from employment with the Company to an independent consultant relationship with the Company, the Company shall have no further obligation or liability to the Executive relating to
the Executive's employment or this Agreement, other than for Base Salary earned but unpaid and accrued but unused vacation through the date of termination. In the event the Executive terminates his
employment to transition to an independent consulting relationship with the Company, the provisions of Section 4.3 shall apply with respect to the Company's obligation to negotiate and enter
into an independent consulting agreement with Executive. 

        5.    Effect of Termination.    The provisions of this Section 5 shall apply in the event of termination of
this Agreement and/or the Executive's employment pursuant to Section 4. 

        5.1.    Payment in Full.    Payment by the Company to the Executive of any Base Salary and other compensation amounts
as specified in Section 4.2 (upon termination for Cause) and Sections 4.3 and 4.4, as well as fulfillment of the Company's obligation to negotiate in good-faith with Executive for
an independent consulting agreement pursuant to Section 4.3, shall constitute the entire obligation of the Company to the Executive, except that nothing in this Section 5.1 is intended
or shall be construed to affect the rights and obligations of the Company, on the one hand, and the Executive, on the other, with respect to any loans, stock warrants, stock pledge arrangements,
option plans or other agreements to the extent said rights or obligations survive the Executive's termination of employment under the provisions of documents relating thereto. 

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        5.2.    Termination of Benefits.    Except for any right of continuation of benefits coverage to the extent provided
by this Agreement and/or COBRA, or other applicable law, benefits shall terminate pursuant to the terms of the applicable benefit plans as of the termination date of the Executive's employment. 

        5.3    Cessation of Severance and Benefits.    If the Executive breaches his obligations under this Agreement and/or
the Non-competition, Nondisclosure and Developments Agreement, the Company may immediately cease payment of all severance and benefits described in this Agreement. The cessation of these
payments shall be in addition to, and not as an alternative to, any other remedies at law or in equity available to the Company, including the right to seek specific performance or an injunction. 

        6.    Non-competition, Nondisclosure and Developments Obligations.    As a condition of the Company entering into this
Agreement, the Employee agrees to execute, prior to the execution of this Agreement by the Company, the Company's Employee Non-competition, Nondisclosure and Developments Agreement (the
"Nondisclosure Agreement") attached hereto as Exhibit A. The obligations of the Executive under
the Nondisclosure Agreement expressly survive any termination of the Executive's employment, regardless of the manner of such termination, or termination of this Agreement. 

        7.    Conflicting Agreements.    The Executive hereby warrants that the execution of this Agreement and the
performance of his obligations hereunder will not breach or be in conflict with any other agreement to which or by which the Executive is a party or is bound and that the Executive is not now subject
to and will not enter into any agreement, including, without limitation, any covenants against competition or similar covenants that would affect the performance of his obligations hereunder. 

        8.    Withholding; Taxes.    All payments made by the Company under this Agreement shall be subject to and reduced by
any federal, state and/or local taxes or other amounts required to be withheld by the Company under any applicable law. 

        9.    Miscellaneous.    

        9.1.    Assignment.    The Executive shall not assign this Agreement or any interest herein. The Company may assign
this Agreement, and it is specifically understood and agreed that no such assignment by the Company shall be deemed to be a "termination" of the
Executive's employment with the Company within the meaning of Section 4 hereof. This Agreement shall inure to the benefit of the Company and shall be binding upon the Company and the Executive,
and their respective successors, executors, administrators, heirs and permitted assigns. 

        9.2.    Severability.    If any portion or provision of this Agreement shall to any extent be declared illegal or
unenforceable by a court of competent jurisdiction, then the application of such provision in such circumstances shall be modified to permit its enforcement to the maximum extent permitted by law, and
both the application of such portion or provision in circumstances other than those as to which it is so declared illegal or unenforceable and the remainder of this Agreement shall not be affected
thereby, and each portion and provision of this Agreement shall be valid and enforceable to the fullest extent permitted by law. 

        9.3.    Waiver; Amendment.    No waiver of any provision hereof shall be effective unless made in writing and signed
by the waiving party. The failure of the Company to require the performance of any term or obligation of this Agreement, or the waiver by the Company of any breach of this Agreement, shall not prevent
any subsequent enforcement of such term or obligation or be deemed a waiver of any subsequent breach. This Agreement may be amended or modified only by a written instrument signed by the Executive
and/or an authorized member of the Board of Directors. 

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        9.4.    Notices.    All notices, requests and other communications provided for by this Agreement shall be in writing
and shall be effective when delivered in person or three (3) business days after being deposited in the mail of the United States, postage prepaid, registered or certified, and addressed
(a) in the case of the Executive, to the address set forth underneath his signature to this Agreement or (b) in the case of the Company, to the attention of the Chairman of the Board, at
58 Charles Street, Cambridge, Massachusetts, 02141, and/or to such other address as either party may specify by notice to the other. 

        9.5.    Entire Agreement.    This Agreement and the Non-competition, Nondisclosure and Developments
Agreement constitute the entire agreement between the Company and the Executive with respect to the terms and conditions of the Executive's employment with the Company and supersede all prior
communications, agreements and understandings, written or oral, between the Executive and the Company with respect to the terms and conditions of the Executive's employment with the Company. 

        9.6.    Counterparts.    This Agreement may be executed in counterparts, each of which shall be original and all of
which together shall constitute one and the same instrument. 

        9.7.    Governing Law.    This Agreement, the employment relationship contemplated herein and any claim arising from
such relationship, whether or not arising under this Agreement, shall be governed by and construed in accordance with the internal laws of the Commonwealth of Massachusetts without giving effect to
any choice or conflict of laws provision or rule thereof. 

        9.8.    Consent to Jurisdiction.    Each of the Company and the Executive, by its or his execution hereof, hereby
irrevocably submits to the exclusive jurisdiction of the state or federal courts of the Commonwealth of Massachusetts for the purpose of any claim or action arising out of or based upon this
Agreement, the Executive's employment with the Company and/or termination thereof, or relating to the subject matter hereof, and agrees not to commence any such claim or action other than in the
above-named courts. 

        IN
WITNESS WHEREOF, this Agreement has been executed by the Company, by its duly authorized representative, and by the Executive, as of the date first above written. 

SONTRA
MEDICAL, INC.

By: /s/ Joseph Kost

Name:
Joseph Kost

Title:
Chief Scientific Officer

THE
EXECUTIVE

/s/ James

Signature

Name—please print

ADDRESS: 

5

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EMPLOYMENT AGREEMENT

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