US ONCOLOGY HOLDINGS, INC. AND US ONCOLOGY, INC.

Exhibit 21.1

Subsidiaries of the Registrant

(All are Delaware entities unless otherwise indicated)

US Oncology, Inc.	RFCC Asset, LLC
AccessMed Holdings, LLC	RFCC Support, LLC
AccessMed, LLC (2)	RMCC Cancer Center, LLC
AOR Holding Company of Indiana, LLC	SelectPlus Oncology, LLC
AOR Management Company of Arizona, LLC	Southeast Texas Cancer Centers, LP (1)
AOR Management Company of Indiana, LLC	St. Louis Pharmaceutical Services, LLC
AOR Management Company of Missouri, LLC	Texas Pharmaceutical Services, LLC
AOR Management Company of Oklahoma, LLC	The Carroll County Cancer Center, LP (1)
AOR Management Company of Pennsylvania, LLC	The Oncology Portal, LLC
AOR Management Company of Virginia, LLC	TOPS Pharmacy Services, Inc. (1)
AOR of Indiana Management Partnership (3)	Tyler Radiation Equipment Leasing, LLC (1)
AOR of Texas Management, LLC	Unity Oncology, LLC
AOR Real Estate of Greenville, L.P.	US Oncology Clinical Development, LLC
AOR Real Estate, LLC	US Oncology Corporate, Inc.
AOR Synthetic Real Estate, LLC	US Oncology Integrated Solutions, LP
AORT Holding Company, Inc.	US Oncology Lab Services, LLC
Cancer Treatment Associates of Northeast Missouri, LP (1)	US Oncology Pharmaceutical Services, LLC
CCCN NW Building JV, LLC	US Oncology Reimbursement Solutions, LLC
Colorado Cancer Centers, LLC (4)	US Oncology Research, LLC (1)
East Indy CC, LLC (3)	US Oncology Specialty, LP
Greenville Radiation Care, Inc.	WFCC Radiation Management Company, LLC (1)
Innovent Oncology, LLC
Iowa Pharmaceutical Services, LLC
KCCC JV, LLC
Life Beyond Cancer Foundation (1)
Metropolitan Integrated Cancer Care, LLC
MHD-USO General, LLC (1)
MHD-USO Management Company, LP (1)
Nebraska Pharmaceutical Services, LLC
New Mexico Pharmaceutical Services, LLC
North Carolina Pharmaceutical Services, LLC
Oncology Rx Care Advantage, LP	(1) Organized in the State of Texas
Oncology Today, LP	(2) Organized in the State of Kansas
Oregon Cancer Centers, Ltd. (1)	(3) Organized in the State of Indiana
Physician Reliance Network, LLC	(4) Organized in the State of Colorado
Physician Reliance, LLC