Document:

<PAGE>
                                                                   Exhibit 10.22
                         EXECUTIVE EMPLOYMENT AGREEMENT

         THIS EXECUTIVE EMPLOYMENT AGREEMENT ("Agreement"), dated as of April,
2004, by and between RADIATION THERAPY SERVICES, INC., a Florida corporation,
("Company"), and Daniel E. Dosoretz ("Executive").

         WHEREAS, the Company is engaged in the business of providing radiation
therapy services to cancer patients;

         WHEREAS, the Executive is currently employed by the Company as its
Chief Executive Officer and is a licensed radiation oncologist who provides
medical services at the Company's radiation therapy centers;

         WHEREAS, the Executive and the Company are currently parties to an
Executive Employment Agreement and a Physician Employment Agreement dated April
1, 1998 (the "Prior Agreements") which Prior Agreements will be superseded by
this Agreement and a new Physician Employment Agreement conditioned upon closing
of the Company's initial public offering;

         WHEREAS, the Company wishes to assure itself of the continued services
of the Executive for the period provided in this Agreement and the Executive is
willing to serve in the employ of the Company for such period upon the terms and
conditions hereinafter set forth; and

         WHEREAS, Executive will be entering into a Physician Employment
Agreement with a subsidiary of the Company, 21st Century Oncology, Inc. (the
"Physician Agreement") concurrently with this Agreement.

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

         1. EMPLOYMENT. The Company hereby agrees to employ the Executive upon
the terms and conditions herein contained, and the Executive hereby agrees to
accept such employment for the term described below. The Executive agrees to
serve as the Company's President and Chief Executive Officer during the term of
this Agreement. In such capacity, the Executive shall have the authorities,
functions, powers, duties and responsibilities that are customarily associated
with such positions and as the Board of Directors may reasonably assign to him
from time to time consistent with such positions. The Company shall use its best
efforts to cause the Executive to be a member of the Company's Board of
Directors throughout the term of this Agreement and shall include him in the
management slate for election as director.

         Throughout the term of this Agreement, the Executive shall devote his
best efforts and substantially all of his business time and services to the
business and affairs of the Company provided; however, that nothing herein shall
preclude Executive from (i) providing physician services for up to two (2) days
per week pursuant to the Physician Agreement, (ii) serving or continuing to
serve as an officer or on the board of directors of entities that do not compete
with the Company or (iii) serving or continuing to serve on the boards or
advisory committees of medical, charitable or other similar organizations.

         2. TERM OF AGREEMENT. The initial three (3) year term of employment
under this Agreement shall commence as of the date of closing of the Company's
initial public offering (the "Effective Date"). After the expiration of such
initial 3 year employment period, the term of the Executive's employment
hereunder shall automatically be extended without further action by the parties
for successive two (2) year renewal terms, provided that if either party gives
the other party at least one hundred twenty (120) days advance

                                      -1-
<PAGE>

written notice of his or its intention to not renew this Agreement for an
additional term, the Agreement shall terminate upon the expiration of the
current term.

                  Notwithstanding the foregoing, the Company shall be entitled
to terminate this Agreement immediately, subject to a continuing obligation to
make any payments required under Section 6 below, if the Executive (i) becomes
disabled as described in Section 6(b), (ii) is terminated for Cause, as defined
in Section 6(c), or (iii) voluntarily terminates his employment before the
current term of this Agreement expires, as described in Section 6(d).

         3. EXECUTIVE COMPENSATION.

                  (a) Annual Base Salary. The Executive shall receive an annual
base salary during the term of this Agreement at a rate of not less than Four
Hundred Fifty Thousand Dollars ($450,000), payable in installments consistent
with the Company's normal payroll schedule. The Board or its Compensation
Committee shall review this base salary at annual intervals, and may adjust the
Executive's annual base salary from time to time as the Board or its
Compensation Committee deems to be appropriate.

                  (b) Performance Incentive Bonus. The Executive shall also be
entitled to receive a quarterly performance-based incentive bonus from the
Company for each fiscal quarter of the Company during the term of this
Agreement, pursuant to the Company's earnings before interest, taxes,
depreciation and amortization performance based bonus plan for executive
officers and significant employees set forth in the attached Appendix "A." The
bonus shall be paid to Executive within thirty (30) days following the
availability of the Company's audited financial statements and shall be payable
in cash, provided however, Executive may elect in his sole discretion to receive
up to 50% of his bonus award in shares of restricted shares of Company common
stock (the "Restricted Shares") which stock shall be valued at a price per share
equal to the closing price of the Company's stock on the last trading day of the
fiscal quarter less a ten percent (10%) discount. The Company shall use its best
efforts to register, and maintain the effectiveness of the registration, for
resale all of the Restricted Shares awarded to Executive pursuant to a Form S-8
(or any successor form) registration statement under the Securities Act.

                  (c) Stock Options. Executive shall receive a stock option
grant of 500,000 shares of Company common stock at an exercise price per share
equal to the initial public offering price of the Company's common stock (the
"Option Shares"). The Option Shares will vest over a three (3) year period from
the date of the grant; provided that Executive is employed as of any vesting
date and if Executive is terminated for cause, all unvested stock will be
forfeited and cancelled; and provided further that upon the earlier to occur of
(A) in the event of the termination of Executive's employment within six (6)
months of the occurrence of a Change in Control (as defined below) by the
Company other than for Cause (as defined below), or voluntarily by Executive or
(B) your continued active employment by the Company in good standing for at
least six (6) months from the consummation of the Change in Control, Executive
shall be fully vested in any then unvested Option Shares (it being understood
that there shall not be accelerated vesting of the Option Shares upon any other
termination of Executive's employment). This stock option grant shall be under
the Company stock option plan and the parties shall enter into a separate stock
option agreement reflecting the terms of this stock option grant. The Company
shall use its best efforts to register, and maintain the effectiveness of the
registration, for resale all of the Option Shares granted to Executive pursuant
to a Form S-8 (or any successor form) registration statement under the
Securities Act.

         4. ADDITIONAL COMPENSATION AND BENEFITS. The Executive shall receive
the following additional compensation and welfare and fringe benefits:

                                      -2-
<PAGE>

                  (a) Participation in Benefit Plans. The Executive shall be
eligible to participate in the employee benefit plans and programs maintained by
the Company from time to time for its executives, or for its employees
generally, including without limitation any life, medical, dental, accidental
and disability insurance and profit sharing, pension, retirement, savings, stock
option, incentive stock and deferred compensation plans, in accordance with the
terms and conditions as in effect from time to time.

                  (b) Vacation. The Executive shall be entitled to no less than
four weeks of vacation (or such greater vacation benefits as may be provided in
the future by the Board or Compensation Committee) during each year during the
term of this Agreement and any extensions thereof, prorated for partial years.

                  (c) Business Expenses. The Company shall reimburse the
Executive for all reasonable expenses he incurs in promoting the Company's
business, including expenses for travel, entertainment of business associates,
service and usage charges for business use of cellular phones and similar items,
upon presentation by the Executive from time to time of an itemized account of
such expenditures.

                  In addition to the benefits provided pursuant to the preceding
paragraphs of this Agreement, the Executive shall be eligible to participate in
such other executive compensation and retirement plans of the Company as are
applicable generally to other officers, and in such welfare benefit plans,
programs, practices and policies of the Company as are generally applicable to
other key employees.

         5. PHYSICIAN AGREEMENT. The compensation set forth in Section 3 above
is intended to compensate Executive for the services he provides while President
and Chief Executive Officer. If the Physician Agreement is terminated for any
reason, but this Agreement is not terminated, the Agreement shall remain in full
force and effect except that Executive's annual base salary shall be increased
to Nine Hundred Thousand Dollars ($900,000) and subsection (i) of Section 1 of
this Agreement shall be deemed to be of no further force or effect.

         6. PAYMENTS UPON TERMINATION

                  (a) Involuntary Termination. If the Executive's employment is
terminated by the Company during the term of this Agreement, the Executive shall
be entitled to receive his base salary accrued through the date of termination.
The Executive shall also receive any nonforfeitable benefits already earned and
payable to him under the terms of any deferred compensation, incentive or other
benefit plan maintained by the Company, payable in accordance with the terms of
the applicable plan.

                  If the termination is not for death, disability as described
in paragraph (b), for Cause as described in paragraph (c) or a voluntary
termination by the Executive as described in paragraph (d), the Company shall
also be obligated to make a series of monthly payments to the Executive for each
month during the remaining term of this Agreement, but not less than thirty-six
(36) months. Each monthly payment shall be equal to one-twelfth (1/12th) of the
sum of Executive's annual base salary, as in effect on the date of termination
plus the amount of the Executive's four most recent quarterly bonuses. In
addition, the vesting of any restricted stock, stock options or other awards
granted to the Executive under the terms of the Company's stock plan or any
written agreement with the Executive shall become immediately vested in full
and, in the case of stock options, exercisable in full. Executive shall also be
permitted to continue to participate at the Company's expense in all benefit and
insurance plans, coverage and programs in which he was participating in for a
period of one (1) year. Executive shall not be required to mitigate the amount
of any payment or benefit contemplated by this paragraph.

                  (b) Disability. The Company shall be entitled to terminate
this Agreement, if the Board determines that the Executive has been unable to
attend to his duties for at least ninety (90) days because of a medically
diagnosable physical or mental condition, and has received a written opinion
from a physician

                                      -3-
<PAGE>

acceptable to the Board that such condition prevents the Executive from resuming
full performance of his duties and is likely to continue for an indefinite
period. Upon such termination, the Company shall pay to Executive a monthly
disability benefit equal to one-twelfth (1/12th) of his current annual base
salary at the time he became permanently disabled. Payment of such disability
benefit shall commence on the last day of the month following the date of the
termination by reason of permanent disability and cease with the earliest of (i)
the month in which the Executive returns to active employment, either with the
Company or otherwise, (ii) the end of the initial term of this Agreement, or the
current renewal term, as the case may be, or (iii) the twenty-fourth month after
the date of the termination. Any amounts payable under this Section 6(b) shall
be reduced by any amounts paid to the Executive under any long-term disability
plan or other disability program or insurance policies maintained or provided by
the Company.

                  (c) Termination for Cause. If the Executive's employment is
terminated by the Company for Cause, the amount the Executive shall be entitled
to receive from the Company shall be limited to his base salary accrued through
the date of termination, and any nonforfeitable benefits already earned and
payable to the Executive under the terms of deferred compensation or incentive
plans maintained by the Company.

                  For purposes of this Agreement, the term "Cause" shall be
limited to (i) any action by the Executive involving willful disloyalty to the
Company, such as embezzlement, fraud, misappropriation of corporate assets or a
breach of the covenants set forth in Sections 10 and 11 below; or (ii) the
Executive being convicted of a felony; or (iii) the Executive being convicted of
any lesser crime or offense committed in connection with the performance of his
duties hereunder or involving fraud, dishonesty or moral turpitude; or (iv) the
intentional gross misconduct or willful gross neglect of the Executive in
carrying out his duties hereunder resulting in material economic harm to the
Company (other than resulting from the Executive's incapacity due to physical or
mental disability) if Executive acted without a good faith belief that the act
or omission was in the best interest of the Company. Notwithstanding the
foregoing, no termination pursuant to subsection (iv) shall be treated as
termination for cause unless the Board has provided executive with at least
thirty (30) days prior written notice specifying in reasonable detail the
alleged breach and giving the Executive a minimum of one hundred twenty (120)
days or such longer period as is reasonably necessary to correct such alleged
breach.

                  If Executive is no longer providing Executive Services but
provides Physician Services on a full time basis, "Cause" shall also include the
final, non-applicable suspension, cancellation or revocation of Executive's
license to practice medicine or to prescribe drugs in any state the Physician
Services are provided or the exclusion of Executive as a participating physician
from the Medicare or Medicaid program or any material third party payor or
managed care programs as a result of any wrongful act of Executive.

                  (d) Voluntary Termination by the Executive. If the Executive
resigns or otherwise voluntarily terminates his employment before the end of the
current term of this Agreement, the amount the Executive shall be entitled to
receive from the Company shall be limited to his base salary accrued through the
date of termination, and any nonforfeitable benefits already earned and payable
to the Executive under the terms of any deferred compensation or incentive plans
of the Company.

                  For purposes of this paragraph, a resignation by the Executive
shall not be deemed to be voluntary if the Executive resigns during the period
of three months after the date he is (i) assigned to a position other than
President and Chief Executive Officer of the Company (other than for Cause, or
by reason of permanent disability), (ii) assigned duties materially inconsistent
with such position, (iii) transferred to a geographic location of employment
more than 50 miles from the current location of employment, (iv) directed to
report to anyone other than the Company's Board of Directors.

         7. EFFECT OF CHANGE IN CORPORATE CONTROL

                                      -4-
<PAGE>

                  (a) In the event of a Change in Corporate Control, the vesting
of any restricted stock, stock options or other awards granted to the Executive
under the terms of the Company's stock plans or any written agreement with
Executive shall become immediately vested in full and, in the case of stock
options, exercisable in full.

                  In addition, if, at any time during the period of twelve (12)
consecutive months following or six (6) months prior to the occurrence of a
Change in Corporate Control, the Executive is involuntarily terminated (other
than for Cause) by the Company, the Executive shall be entitled to receive as
severance pay from the Company in a lump sum payment within 30 days the amount
equal to the sum of (i) 250% of the Executive's annual base salary in effect at
the time of the Change in Corporate Control plus (ii) 250% of the annual bonus
paid to the Executive with respect to the last fiscal year of the Company ending
prior to the Change in Corporate Control.

                  (b) For purposes of this Agreement, a "Change in Corporate
Control" shall include any of the following events:

                           (1) The acquisition in one or more transactions of
                  more than fifty percent (50%) of the Company's outstanding
                  Common Stock by any corporation, or other person or group
                  (within the meaning of Section 14(d)(3) of the Securities
                  Exchange Act of 1934, as amended);

                           (2) Any merger or consolidation of the Company into
                  or with another corporation in which the Company is not the
                  surviving entity, or any transfer or sale of substantially all
                  of the assets of the Company or any merger or consolidation of
                  the Company into or with another corporation in which the
                  Company is the surviving entity and, in connection with such
                  merger or consolidation, all or part of the outstanding shares
                  of Common Stock shall be changed into or exchanged for other
                  stock or securities of any other person, or cash, or any other
                  property.

                           (3) Any election of persons to the Board of Directors
                  which causes a majority of the Board of Directors to consist
                  of persons other than (i) persons who were members of the
                  Board of Directors during the first year of this Agreement and
                  (ii) persons who were nominated for election as members of the
                  Board by the Board of Directors (or a Committee of the Board)
                  at a time when the majority of the Board (or of such
                  Committee) consisted of persons who were members of the Board
                  of Directors during the first year of this Agreement;
                  provided, that any person nominated for election by the Board
                  of Directors composed entirely of persons described in (i) or
                  (ii), or of persons who were themselves nominated by such
                  Board, shall for this purpose be deemed to have been nominated
                  by a Board composed of persons described in (i).

                           (4) Any person, or group of persons, announces a
                  tender offer for at least fifty percent (50%) of the Company's
                  Common Stock.

provided, however, that if the Change in Corporate Control occurs and Executive
continues in his position, the Executive's then current annual base salary and
bonus shall be automatically increased by 150% for the period which is the
greater of the remaining term of this Agreement or three (3) years, in lieu of
the amounts set forth in (a) above.

                  In the event that any payment or benefits received or to be
received by Executive pursuant to this Agreement ("Benefits") would (i)
constitute a "parachute payment" within the meaning of Section 280G of the
Internal Revenue Code of 1986, as amended (the "Code"), or any comparable
successor provisions, and (ii) but for this subsection, would be subject to the
excise tax imposed by Section 4999 of the Code, or any comparable successor
provisions (the "Excise Tax"), then benefits to which Executive will be entitled
pursuant to

                                      -5-
<PAGE>

this Section 7 (the "Benefits") shall be either: (i) provided to Executive in
full, or (ii) provided to Executive as to such lesser extent which would result
in no portion of such benefits being subject to the Excise Tax, whichever of the
foregoing amounts, when taking into account applicable federal, state, local and
foreign income and employment taxes, the Excise Tax, and any other applicable
taxes, results in the receipt by Executive, on an after-tax basis, of the
greatest amount of benefits, notwithstanding that all or some portion of such
benefits may be taxable under the Excise Tax. Unless the Company and Executive
otherwise agree in writing, any determination required under this subsection
shall be made in writing in good faith by an accountant selected by the mutual
agreement of Executive and the Company (the "Accountant"). The Company shall
bear all costs the Accountant may reasonably incur in connection with any
calculations contemplated by this subsection.

         8. DEATH. If the Executive dies during the term of this Agreement, the
Company shall pay to the Executive's estate a lump sum payment equal to the sum
of the Executive's base salary accrued through the date of death plus the total
unpaid amount of any bonuses earned with respect to the fiscal year of the
Company most recently ended. In addition, the death benefits payable by reason
of the Executive's death under any retirement, deferred compensation or other
employee benefit plan maintained by the Company shall be paid to the beneficiary
designated by the Executive in accordance with the terms of the applicable plan
or plans.

         9. WITHHOLDING. The Company shall, to the extent permitted by law, have
the right to withhold and deduct from any payment hereunder any federal, state
or local taxes of any kind required by law to be withheld with respect to any
such payment.

         10. PROTECTION OF CONFIDENTIAL INFORMATION. The Executive agrees that
he will keep all confidential and proprietary information of the Company or
relating to its business (including, but not limited to, information regarding
the Company's customers, pricing policies, methods of operation, proprietary
computer programs and trade secrets) confidential, and that he will not (except
with the Company's prior written consent), while in the employ of the Company or
thereafter, disclose any such confidential information to any person, firm,
corporation, association or other entity, other than in furtherance of his
duties hereunder, and then only to those with a "need to know." The Executive
shall not make use of any such confidential information for his own purposes or
for the benefit of any person, firm, corporation, association or other entity
(except the Company) under any circumstances during or after the term of his
employment. The foregoing shall not apply to any information which is already in
the public domain, or is generally disclosed by the Company or is otherwise in
the public domain at the time of disclosure.

                  The Executive recognizes that because his work for the Company
will bring him into contact with confidential and proprietary information of the
Company, the restrictions of this Section 9 are required for the reasonable
protection of the Company and its investments and for the Company's reliance on
and confidence in the Executive.

         11. COVENANT NOT TO COMPETE. The Executive hereby agrees that he will
not, either during the term of the Employment Agreement or during the period of
two (2) years from the time this Employment Agreement is terminated or expires
for any reason, (i) engage in any business activities on behalf of any
enterprise which competes with the Company in the business of providing or
managing radiation therapy services in any state which the Company then operates
in, (ii) solicit the Company's employees or customers or (iii) hire any of the
Company's employees. The Executive will be deemed to be engaged in such business
activities if he participates in such a business enterprise as an employee,
officer, director, consultant, agent, partner, proprietor, or other participant;
provided that the ownership of no more than 2 percent of the stock of a publicly
traded corporation shall not be deemed to be engaging in business activities.

         12. INJUNCTIVE RELIEF. The Executive acknowledges and agrees that it
would be difficult to

                                      -6-
<PAGE>

fully compensate the Company for damages resulting from the breach or threatened
breach of the covenants set forth in Sections 10 and 11 of this Agreement and
accordingly agrees that the Company shall be entitled to temporary and
injunctive relief, including temporary restraining orders, preliminary
injunctions and permanent injunctions, to enforce such provisions in any action
or proceeding instituted in the United States District Court for the Western
District of Florida or in any court in the State of Florida having subject
matter jurisdiction. This provision with respect to injunctive relief shall not,
however, diminish the Company's right to claim and recover damages.

         It is expressly understood and agreed that although the parties
consider the restrictions contained in this Agreement to be reasonable, if a
court determines that the time or territory or any other restriction contained
in this Agreement is an unenforceable restriction on the activities of the
Executive, no such provision of this Agreement shall be rendered void but shall
be deemed amended to apply as to such maximum time and territory and to such
extent as such court may judicially determine or indicate to be reasonable.

         The Executive acknowledges and confirms that (a) the restrictive
covenants contained in Sections 10 and 11 hereof are reasonably necessary to
protect the legitimate business interests of the Company, and (b) the
restrictions contained in Sections 10 and 11 hereof (including without
limitation the length of the term of the provisions of Sections 10 and 11
hereof) are not overbroad, overlong, or unfair and are not the result of
overreaching, duress or coercion of any kind. The Executive further acknowledges
and confirms that his full, uninhabited and faithful observance of each of the
covenants contained in Sections 10 and 11 hereof will not cause him any undue
hardship, financial or otherwise, and that enforcement of each of the covenants
contained herein will not impair his ability to obtain employment commensurate
with his abilities and on terms fully acceptable to him or otherwise to obtain
income required for the comfortable support of him and his family and the
satisfaction of the needs of his creditors. The Executive acknowledges and
confirms that his special knowledge of the business of the Company is such as
would cause the Company serious injury or loss if he were to use such ability
and knowledge to the benefit of a competitor or were to compete with the Company
in violation of the terms of Sections 10 and 11 hereof. The Executive further
acknowledges that the restrictions contained in Sections 10 and 11 hereof are
intended to be, and shall be, for the benefit of and shall be enforceable by,
the Company's successors and assigns.

         If the Executive shall be in violation of any provision of Sections 10
and 11, then each time limitation set forth in the applicable section shall be
extended for a period of time equal to the period of time during which such
violation or violations occur. If the Company seeks injunctive relief from such
violation in any court, then the covenants set forth in Sections 10 and 11 shall
be extended for a period of time equal to the pendency of such proceeding
including all appeals by the Executive.

         Sections 10, 11 and 12 of this Agreement shall survive the termination
or expiration of this Agreement.

         13. SEPARABILITY. If any provision of this Agreement shall be declared
to be invalid or unenforceable, in whole or in part, such invalidity or
unenforceability shall not affect the remaining provisions hereof which shall
remain in full force and effect.

         14. ASSIGNMENT. This Agreement shall be binding upon and inure to the
benefit of the heirs and representatives of the Executive and the assigns and
successors of the Company, but neither this Agreement nor any rights hereunder
shall be assignable or otherwise subject to hypothecation by the Executive. The
Company may assign this Agreement to any of its subsidiaries or affiliates.

         15. ENTIRE AGREEMENT. This Agreement represents the entire agreement of
the parties and shall supersede the Prior Agreements and any other previous
contracts, arrangements or understandings between

                                      -7-
<PAGE>

the Company and the Executive related to employment. The Agreement may be
amended at any time by mutual written agreement of the parties hereto.

         16. GOVERNING LAW. This Agreement shall be construed, interpreted, and
governed in accordance with the laws of the State of Florida, other than the
conflict of laws provisions of such laws.

         17. HEADINGS. The headings contained in this Agreement are included for
convenience only and no such heading shall in any way alter the meaning of any
provision.

         18. WAIVER. The failure of either party to insist upon strict adherence
to any obligation of this Agreement shall not be considered a waiver or deprive
that party of the right thereafter to insist upon strict adherence to that term
or any other term of this Agreement. Any waiver must be in writing.

         19. COUNTERPARTS. This Agreement may be executed in two (2)
counterparts, each of which shall be considered an original.

                                      -8-
<PAGE>

         IN WITNESS WHEREOF, the Company has caused this Agreement to be duly
executed, and the Executive has hereunto set his hand, as of the day and year
first above written.

                                   RADIATION THERAPY SERVICES, INC.

                                   By:
                                      ------------------------------------------
                                   Name:
                                   Title:

                                   EXECUTIVE:
                                   /s/ Daniel E. Dosoretz
                                   ---------------------------------------------
                                   Daniel E. Dosoretz, M.D.

                                      -9-
<PAGE>

                                  APPENDIX "A"

                           (PERFORMANCE BONUS PLAN FOR
                  EXECUTIVE OFFICERS AND SIGNIFICANT EMPLOYEES)

         In accordance with Section 3(b) of this Agreement, the Executive shall
be entitled to receive during the term of this Agreement a quarterly bonus equal
to no less than 2.5% of the Company's earnings before interest, taxes,
depreciation and amortization which amount may be increased from time to time in
compliance with Section 162(m) of the Internal Revenue Code and the bonus plan.

                                      -10-<PAGE>
                                                                   Exhibit 10.23

                         PHYSICIAN EMPLOYMENT AGREEMENT

         THIS PHYSICIAN EMPLOYMENT AGREEMENT ("Agreement") is made and entered
into as of April, 2004 by and between 21ST CENTURY ONCOLOGY, INC., a Florida
corporation ("21st Century") or its assignee and DANIEL E. DOSORETZ, M.D.
("Physician").

                                   WITNESSETH:

         WHEREAS, 21st Century is a Florida corporation that operates radiation
therapy centers ("Centers"); and

         WHEREAS, 21st Century is subsidiary of Radiation Therapy Services, Inc.
("RTSI"), a Florida corporation that has ownership interests in other
corporations (the "Affiliates") that operate Centers; and

         WHEREAS, Physician is a radiation oncologist who is licensed to
practice medicine in certain states in which 21st Century operates Centers;

         WHEREAS, Physician is concurrently herewith entering into an Executive
Employment Agreement (the "Executive Agreement") with RTSI; and

         WHEREAS, 21st Century wishes to engage Physician to provide medical
services as a radiation oncologist at certain of the Centers operated by 21st
Century according to the terms and conditions of this Agreement which is
conditioned upon closing of RTSI's initial public offering.

         NOW, THEREFORE, in consideration of the premises and of the promises
hereinafter contained, the parties agree as follows:

         1. TERM. Subject to the conditions set forth below, Physician agrees to
provide services as a radiation oncologist at the Centers specified pursuant to
this Agreement to such persons as are accepted by 21st Century as patients of
the Centers. Unless terminated earlier by either party as provided herein, this
Agreement shall be for three (3) years beginning the date hereof, and shall be
automatically renewed for consecutive two (2) year terms thereafter on the
anniversary date of this Agreement unless either party gives written notice to
the other party at least one hundred twenty (120) days in advance of the renewal
date of its intent not to renew the Agreement.

         2. ACCEPTANCE BY PHYSICIAN. Physician agrees to provide medical
services at the Centers on the terms and conditions herein set forth. Physician
shall practice at such Centers as are mutually agreed and it is contemplated
that Physician will work two (2) days per week under this Agreement while the
Executive Agreement is in effect. Throughout the term of this Agreement and any
renewal period hereof, Physician will be licensed to practice medicine in the
State of Florida and/or such other states as mutually agreed. Physician agrees
that in the rendition of such professional services at the Centers, Physician
will comply with the reasonable policies, standards and regulations of 21st
Century established from time to time. This Agreement is exclusive in favor of
21st Century and Physician may not perform services for other providers of
radiation therapy or oncology services without the prior written approval of
21st Century. Nothing in this Agreement shall be deemed to preclude Physician
from (i) serving or continuing to serve as an officer or on the Board of
Directors of entities that do not compete with 21st Century or (ii) serving or
continuing to serve on the board or advisory committees of medical, charitable
or other similar organizations.

         3. COMPENSATION. A. 21st Century agrees to pay Physician for the
services provided hereunder a base annual salary of Four Hundred Fifty Thousand
Dollars ($450,000) ("Base Salary").

<PAGE>

Physician shall be eligible for all fringe benefit plans, disability plan and
other health and welfare benefit plans of 21st Century. 21st Century shall pay
all medical malpractice insurance premiums related to Physician's employment
including "tail" coverage after termination or expiration of this Agreement. The
Medical Director or Board of Directors of the Company may provide a bonus to
Physician based upon a RVU formula.

         4. TERMINATION OTHER THAN FOR CAUSE. A. If Physician dies or becomes
disabled during any term of this Agreement, 21st Century agrees to pay to
Physician's designated beneficiary as salary continuation or to Physician one
(1) year of Physician's monthly Base Salary, plus such additional Base Salary as
Physician may have become entitled to pursuant to section 3 above, payable
monthly, beginning with the date of death or commencement of disability;
thereafter, in the case of disability and for the duration thereof, Physician
shall receive benefits to the extent provided under 21st Century's disability
plan (the "Disability Plan"). For purposes of this Agreement, "disability" shall
have the meaning given in the Disability Plan.

                (a) If Physician voluntarily gives written notice at least
ninety (90) days in advance of the last day of any term hereunder to terminate
this Agreement at the expiration of such term and continues to render services
as provided herein until at the end of the term, 21st Century agrees to pay to
Physician as severance pay two (2) months of Physician's monthly Base Salary for
the immediately preceding twelve month period, plus such additional Base Salary
as Physician may have become entitled to pursuant to section 3 above, payable
monthly, beginning with the date of actual termination of this Agreement. Said
severance pay shall be in addition to the compensation earned by Physician
during the notice period required herein. Physician must render services as
provided hereunder during the 90 day period. The required notice and continued
service is of the essence, and if Physician does not give the required notice
and continue to be available for full-time exclusive service to 21st Century
pursuant to this Agreement during the notice period, Physician shall not be
entitled to any severance pay.

                (b) If Physician voluntarily terminates his employment for any
reason prior to the end of a term or without giving notice in accordance with
section 1 of this Agreement, 21st Century shall have no liability to Physician
other than for accrued and unpaid Base Salary prior to the date of termination.

                (c) If 21st Century terminates Physician without "cause" (as
defined in section 5 below), 21st Century shall pay Physician all compensation
provided for in section 3 above until the end of the then-current term of this
Agreement.

                (d) If the Executive Agreement is terminated for any reason,
but this Agreement is not terminated, this Agreement shall continue in full
force and effect, except that the annual Base Salary shall be increased to an
amount that is no less than the amount of annual compensation of the highest
paid physician then employed by or associated with 21st Century, and Physician
shall be expected to devote full time and attention to the rendition of
professional services pursuant to this Agreement.

                (e) If this Agreement is terminated for any reason, but the
Executive Agreement is not terminated, Physician shall not receive the
post-termination or severance benefits set forth in subsections (a) and (b)
above so long as his annual base salary under the Executive Agreement is
increased pursuant to the upward adjustment clause under Section 5 of the
Executive Agreement.

         5. TERMINATION FOR CAUSE. This Agreement shall be deemed to be
terminated for "cause" by 21st Century, and the relationship of 21st Century and
Physician existing between the parties shall be deemed severed without any
liability on the part of 21st Century to Physician for further compensation or
remuneration (other than for accrued and unpaid Base Salary prior to the date of
termination) upon the occurrence of any of the following events:

<PAGE>

                (a) A final and unappealable suspension, revocation, or
cancellation of Physician's license or right to perform medical services in the
State of Florida;

                (b) The final and unappealable placing or imposing of any
restrictions or limitations, by any governmental authority having jurisdiction
over Physician, upon Physician so that Physician cannot engage in the medical
services contemplated hereunder;

                (c) Physician shall willfully or with gross negligence fail or
refuse to materially comply after reasonable notice with the reasonable
policies, standards, and regulations of 21st Century from time to time
established or engage in gross misconduct resulting in material economic harm to
21st Century;

                (d) Physician is convicted of a felony;

                (e) Physician is convicted of a crime or offense committed in
connection with his duties hereunder; or

                (f) Physician is excluded from the Medicare or Medicaid program
as a participating physician.

         No termination shall be treated as a termination for "cause" unless the
Physician is given a minimum of one hundred and twenty (120) days or such longer
period as is reasonably necessary to cure an alleged breach.

         6. NON-COMPETITIVE AND RESTRICTIVE AGREEMENTS.

                (a) During the term of this Agreement and any renewal period,
Physician shall not undertake any professional service except as directed and
authorized by 21st Century and shall not engage in any profession other than the
rendition of the professional services as directed by 21st Century.

                (b) In the event of the termination of this Agreement for any
reason, Physician agrees not to directly or indirectly engage in the practice of
radiation therapy or oncology, or otherwise compete with 21st Century, or any of
its physician providers, by practicing as a radiation therapist or oncologist
(i) at any hospital in which physician providers of 21st Century regularly admit
patients, (ii) within any county in which 21st Century or any of its Affiliates
operate a Center, or (iii) or within a radius of twenty-five (25) miles of any
Center of 21st Century or any of its Affiliates, for a period of two (2) years
after the date of such actual termination of this Agreement. The purpose of this
covenant is to protect 21st Century from the irreparable harm it will suffer if
Physician competes with 21st Century after having participated in the initial
public offering of RTSI, and having been introduced to 21st Century's personnel
and patients and after learning special medical procedures used by 21st
Century's physician providers, 21st Century's business procedures, office and
practice policies, and the special and confidential professional procedures
developed by 21st Century.

                (c) The parties agree that in the event of any breach or
attempted breach of any of the covenants set out in section 6(b) (the "Covenant
Not to Compete"), 21st Century will be entitled to equitable relief by way of
injunction or otherwise, in addition to any remedy at law which may be
available. The parties agree that any violation or threatened violation by
Physician of the Covenant Not to Compete will cause 21st Century to suffer
irreparable harm. The parties agree that 21st Century's remedy of an injunction
is not the exclusive remedy for breach of the Covenant Not to Compete and that a
court may grant such additional relief as is reasonable.

<PAGE>

                (d) In the event the Covenant Not to Compete shall be determined
by a court of competent jurisdiction to be unenforceable by reason of its
geographic or temporal restrictions being too great, or by reason that the range
of activities covered is too great, or for any other reason, this Section 6
shall be interpreted to extend over the maximum geographic area, period of time,
range of activities or other restrictions as to which it may be enforceable.

                (e) RTSI shall be a third party beneficiary of this Section 6 to
the extent permitted by law.

         7. 21ST CENTURY'S RIGHT TO INCOME. All fees, compensation, monies, and
other things of value charged by 21st Century and received or realized as a
result of the rendition of medical services by Physician pursuant to this
Agreement shall belong to and be paid and delivered to 21st Century.

         8. PHYSICIAN EXPENSES. 21st Century shall pay the reasonable business
expenses as are incurred by Physician upon presentation by Physician of an
itemized account of such expenditures.

         9. VACATION AND TIME AWAY. Physician shall be entitled to no less than
four (4) weeks vacation with pay during each year of this Agreement. Physician
may take additional time away from the practice to attend professional meetings
and seminars with the reasonable expenses paid for by 21st Century with the
prior approval of 21st Century. All time away from practice, including time for
vacation and continuing medical education, shall be scheduled with 21st Century.
Physician shall be responsible for arranging coverage during Physician's
absences for vacation and continuing medical education and shall inform 21st
Century of such coverage arrangements.

         10. NOTICES. Any notice required or permitted to be given pursuant to
this Agreement shall be sufficient if in writing and if sent by registered mail
to either party at its last known residence.

         11. GOVERNING LAW. This Agreement shall be governed by the laws of the
State of Florida.

         12. ENTIRE AGREEMENT. This instrument contains the entire agreement of
the parties regarding Physician's provision of medical services at the Centers
and supersedes all previous negotiations, discussions, and agreements between
the parties. Any amendments or modifications to this Agreement shall be made in
writing only and shall be by agreement of 21st Century and Physician.

         13. ASSIGNMENT. This Agreement may not be assigned without the written
consent of the parties.

         14. SEVERABILITY. In the event that any paragraph or clause of this
Agreement is held or declared by a final and unappealable decision to be void,
illegal, or unenforceable for any reason, the offending paragraph or clause
shall, if possible, be reformed by the authority making such decision in such
manner as will implement, to the fullest extent legally permissible, the
expressed intentions of the parties hereto without illegality or
unenforceability. If such reformation is not possible, the offending paragraph
or clause shall be stricken and all other paragraphs and clauses of this
Agreement shall nevertheless remain in full force and effect; provided, however,
that if striking such offending clause or paragraph would result in a
substantial change in the contractual relationship between the parties, thereby
depriving either or both of the parties of the benefit of the fundamental
economic bargain herein set forth, this Agreement shall become voidable upon
demand of the party whose interests are thus impaired.

         15. HEADINGS. The headings contained in this Agreement are included for
convenience only and no such heading shall in any way alter the meaning of any
provision.

<PAGE>

         16. WAIVER. The failure of either party to insist upon strict adherence
to any obligation of this Agreement shall not be considered a waiver or deprive
that party of the right thereafter to insist upon strict adherence to that term
or any other term of this Agreement. Any waiver must be in writing.

         17. COUNTERPARTS. This Agreement may be executed in two (2)
counterparts, each of which shall be considered an original.

         IN WITNESS WHEREOF, the parties have set their hands and seals the day
and year first above written.

                                   21ST CENTURY ONCOLOGY, INC.

                                   By:
                                      -----------------------------------------

                                   Title:
                                          -------------------------------------

                                   "PHYSICIAN"

                                   /s/ Daniel E. Dosortez, M.D.
                                   --------------------------------------------
                                   Daniel E. Dosortez, M.D.

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00067-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00067-of-00352.parquet"}]]