Exhibit 21.1

RADIATION THERAPY SERVICES, INC.

List of Subsidiaries

December 31, 2006



|                                 |  |                                                                                                                              |  |                |  |            
|-------------------------------- |  | ---------------------------------------------------------------------------------------------------------------------------- |  | -------------- |  | -----------
|OWNER                            |  | SUBSIDIARY                                                                                                                   |  | STATE OF INC.  |  | % OWNERSHIP
|Radiation Therapy Services, Inc. |  | 21stCentury Oncology, Inc.                                                                                                   |  | Florida        |  | 100%       
|                                 |  |                                                                                                                              | 
|Radiation Therapy Services, Inc. |  | 21stCentury Oncology of Pennsylvania, Inc.                                                                                   |  | Pennsylvania   |  | 100%       
|                                 |  |                                                                                                                              | 
|Radiation Therapy Services, Inc. |  | California Radiation Therapy Management Services, Inc.                                                                       |  | California     |  | 100%       
|                                 |  |                                                                                                                              | 
|Radiation Therapy Services, Inc. |  | Michigan Radiation Therapy Management Services, Inc.                                                                         |  | Michigan       |  | 100%       
|                                 |  |                                                                                                                              | 
|Radiation Therapy Services, Inc. |  | North California Radiation Therapy Management Services, Inc.                                                                 |  | North Carolina |  | 100%       
|                                 |  |                                                                                                                              | 
|Radiation Therapy Services, Inc. |  | Maryland Radiation Therapy Management Services, Inc.                                                                         |  | Maryland       |  | 100%       
|                                 |  |                                                                                                                              | 
|Radiation Therapy Services, Inc. |  | New York Radiation Therapy Management Services, Inc.                                                                         |  | New York       |  | 100%       
|                                 |  |                                                                                                                              | 
|Radiation Therapy Services, Inc. |  | Financial Services of Southwest Florida, LLC (surviving entity in merger with Financial Services of Southwest Florida, Inc.) |  | Florida        |  | 100%       



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|                                                     |  |                                                                 |  |               |  |      
|---------------------------------------------------- |  | --------------------------------------------------------------- |  | ------------- |  | -----
|Radiation Therapy Services, Inc.                     |  | Radiation Therapy School for Radiation Therapy Technology, Inc. |  | Florida       |  | 100% 
|                                                     |  |                                                                 | 
|Radiation Therapy Services, Inc.                     |  | 21stCentury Oncology of Kentucky, LLC                           |  | Kentucky      |  | 100% 
|                                                     |  |                                                                 | 
|Radiation Therapy Services, Inc.                     |  | 21stCentury Oncology of Alabama, Inc.                           |  | Alabama       |  | 100% 
|                                                     |  |                                                                 | 
|Radiation Therapy Services, Inc.                     |  | South County Radiation Therapy, LLC                             |  | Rhode Island  |  | 63.5%
|                                                     |  |                                                                 | 
|Radiation Therapy Services, Inc.                     |  | Southern New England Regional Cancer Center, LLC                |  | Rhode Island  |  | 62%  
|                                                     |  |                                                                 | 
|Radiation Therapy Services, Inc.                     |  | Devoto Construction of Southwest Florida, Inc.                  |  | Florida       |  | 100% 
|                                                     |  |                                                                 | 
|Radiation Therapy Services, Inc.                     |  | 21stCentury Oncology of New Jersey, Inc.                        |  | New Jersey    |  | 100% 
|                                                     |  |                                                                 | 
|Radiation Therapy Services, Inc.                     |  | New England Radiation Therapy Management Services, Inc.         |  | Massachusetts |  | 100% 
|                                                     |  |                                                                 | 
|Radiation Therapy Services, Inc.                     |  | Arizona Radiation Therapy Management Services, Inc.             |  | Arizona       |  | 100% 
|                                                     |  |                                                                 | 
|Maryland Radiation Therapy Management Services, Inc. |  | Northwest Baltimore Radiation Therapy Regional Center, LLC      |  | Maryland      |  | 90%  



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|                                                     |  |                                                              |  |               |  |      |  
|---------------------------------------------------- |  | ------------------------------------------------------------ |  | ------------- |  | ---- | -
|Maryland Radiation Therapy Management Services, Inc. |  | Berlin Radiation Therapy Treatment Center, LLC               |  | Maryland      |  | 50.1 | %
|                                                     |  |                                                              | 
|Maryland Radiation Therapy Management Services, Inc. |  | Ambergris, LLC                                               |  | West Virginia |  | 60   | %
|                                                     |  |                                                              | 
|Maryland Radiation Therapy Management Services, Inc. |  | Bluefield Radiation Oncology Center, LLC                     |  | West Virginia |  | 49   | %
|                                                     |  |                                                              | 
|Maryland Radiation Therapy Management Services, Inc. |  | 21stCentury Oncology of Prince Georges County, Maryland,
LLC |  | Maryland      |  | 100  | %
|                                                     |  |                                                              | 
|Maryland Radiation Therapy Management Services, Inc. |  | 21stCentury Oncology of Harford County, Maryland,
LLC        |  | Maryland      |  | 100  | %
|                                                     |  |                                                              | 
|Michigan Radiation Therapy Management Services, Inc. |  | Phoenix Management Company, LLC                              |  | Michigan      |  | 100  | %
|                                                     |  |                                                              | 
|Michigan Radiation Therapy Management Services, Inc. |  | American Consolidated Technologies, LLC                      |  | Michigan      |  | 100  | %
|                                                     |  |                                                              | 
|21stCentury Oncology of Kentucky, LLC                |  | Bluegrass Regional Cancer Center, LLP                        |  | Kentucky      |  | 90   | %
|                                                     |  |                                                              | 
|21stCentury Oncology, Inc.                           |  | Nevada Radiation Therapy Management Services, Inc.           |  | Nevada        |  | 100  | %



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|                                                        |  |                                                |  |              |  |     |  
|------------------------------------------------------- |  | ---------------------------------------------- |  | ------------ |  | --- | -
|21stCentury Oncology, Inc.                              |  | Palms West Radiation Therapy, LLC              |  | Florida      |  | 50  | %
|                                                        |  |                                                | 
|21stCentury Oncology, Inc.                              |  | Palmetto Radiation Associates, LLC             |  | Florida      |  | 50  | %
|                                                        |  |                                                | 
|21stCentury Oncology, Inc.                              |  | Naples PET, LLC                                |  | Florida      |  | 40  | %
|                                                        |  |                                                | 
|21stCentury Oncology, Inc.                              |  | 21stCentury Oncology Management Services, Inc. |  | Florida      |  | 100 | %
|                                                        |  |                                                | 
|New England Radiation Therapy Management Services, Inc. |  | Roger Williams Radiation Therapy, LLC          |  | Rhode Island |  | 51  | %
|                                                        |  |                                                | 
|New York Radiation Therapy Management Services, Inc.    |  | Faxton Leasing, LLC                            |  | New York     |  | 37  | %



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