EX-21 6 dex21.txt SUBSIDIARIES OF THE REGISTRANT Exhibit 21.1 SUBSIDIARIES OF THE REGISTRANT NAME STATE OF ORGANIZATION US Oncology Corporate, Inc. Delaware AOR Real Estate, Inc. Delaware RMCC Cancer Center, Inc. Delaware AOR Management Company of Indiana, Inc. Delaware AOR Holding Company of Indiana, Inc. Delaware AOR of Indiana Management Partnership Indiana AOR Management Company of Oregon, Inc. Delaware AOR Management Company of Missouri, Inc. Delaware AOR Management Company of Arizona, Inc. Delaware AOR Management Company of Oklahoma, Inc. Delaware AOR Management Company of Pennsylvania, Inc. Delaware AOR Management Company of Virginia, Inc. Delaware AOR Management Company of New York, Inc. Delaware AOR Management Company of Texas, Inc. Delaware AOR Management Company of Ohio, Inc. Delaware AOR Management Company of Kansas, Inc. Delaware AORT Holding Company, Inc. Delaware AOR of Texas Management Limited Partnership Texas AORIP, Inc. Delaware AOR Synthetic Real Estate, Inc. Delaware Greenville Radiation Care, Inc. Delaware Physician Reliance Network, Inc. Delaware US Oncology Research, Inc. Texas Physician Reliance Holdings, LLC Delaware PRN Physician Reliance, LLC Texas Physician Reliance, L.P. Texas Michigan Pharmaceutical Services, LLC Delaware Iowa Pharmaceutical Services, LLC Delaware New Mexico Pharmaceutical Services, LLC Delaware California Pharmaceutical Services, LLC Delaware Washington Pharmaceutical Services, LLC Delaware North Carolina Pharmaceutical Services, LLC Delaware