X0201 4/A 2003-08-08 2003-08-12 0000943061 US ONCOLOGY INC USON 0001201039 BAILES JOSEPH S 16825 NORTHCHASE DRIVE SUITE 1300 HOUSTON 77060 1 Executive Vice President Common Stock 2003-08-08 4 S 0 50000 7.56 D 14993 D Joseph S. Bailes 2003-08-14