US Oncology Holdings, Inc.

1.02,8.01

1.02,5.01,5.05

Regulation FD Disclosure

General form for quarterly reports under Section 13 or 15(d)

Entry into a Material Definitive Agreement

5.02

General form for quarterly reports under Section 13 or 15(d) (amendment)

General form for quarterly reports under Section 13 or 15(d)

2.02,9.01

2.02,9.01

5.02,5.07

General form for quarterly reports under Section 13 or 15(d)

Annual report pursuant to Section 13 or 15(d)

Results of Operations and Financial Condition

Other Events

Results of Operations and Financial Condition

General form for quarterly reports under Section 13 or 15(d)

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

General form for quarterly reports under Section 13 or 15(d)

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

General form for quarterly reports under Section 13 or 15(d)

Annual report pursuant to Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Annual report pursuant to Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Correspondence with the SEC

Correspondence with the SEC

Correspondence with the SEC

Registration statement under Securities Act of 1933 (amendment)

Notice of Effectiveness

General form for quarterly reports under Section 13 or 15(d)

Letter from the SEC

Registration statement under Securities Act of 1933

General form for quarterly reports under Section 13 or 15(d)

Annual report pursuant to Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933 (amendment)

Letter from the SEC

Correspondence with the SEC

Registration statement under Securities Act of 1933