US Oncology Holdings, Inc.

Q: Sep 30 2010

Q: Jun 30 2010

Q: Jun 30 2010

Q: Mar 31 2010

FY: Dec 31 2009

Q: Sep 30 2009

Q: Jun 30 2009

Q: Mar 31 2009

FY: Dec 31 2008

Q: Sep 30 2008

Q: Jun 30 2008

Q: Mar 31 2008

FY: Dec 31 2007

Q: Sep 30 2007

Q: Jun 30 2007

Q: Mar 31 2007

FY: Dec 31 2006

Q: Sep 30 2006

Q: Jun 30 2006

Q: Mar 31 2006

1.02,8.01

1.02,5.01,5.05

Regulation FD Disclosure

Entry into a Material Definitive Agreement

5.02

2.02,9.01

2.02,9.01

5.02,5.07

Results of Operations and Financial Condition

Other Events

Results of Operations and Financial Condition

8.01,9.01

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

5.02

Entry into a Material Definitive Agreement

2.02,9.01

5.02,9.01

1.01,1.02,2.03,8.01,9.01

8.01,9.01

8.01,9.01

Registration statement under Securities Act of 1933 (amendment)

Notice of Effectiveness

Registration statement under Securities Act of 1933

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933

Correspondence with the SEC

Correspondence with the SEC

Correspondence with the SEC

Letter from the SEC

Letter from the SEC

Correspondence with the SEC