THIRD ADDENDUM TO MANAGEMENT SERVICES AGREEMENT

Exhibit 10.6

THIRD ADDENDUM TO MANAGEMENT SERVICES AGREEMENT

This Third Addendum (the “Addendum”) is entered into as of August 1, 2007, by and between CALIFORNIA RADIATION THERAPY MANAGEMENT SERVICES, INC., a California corporation (“Manager”) and 21^ST CENTURY ONCOLOGY OF CALIFORNIA A MEDICAL CORPORATION, a California medical corporation (“Medical Group”). This Addendum amends Sections 1.(a) of the Management Services Agreement dated May 1, 2006, as set forth below.

From and after the date here of,

(i) Section 1.(a) shall be amended to read as follows:

“(a) Management. The Manager will be responsible for general management and administration operations of the Office locations, excluding the provision of medical services, set forth on Exhibit B hereto. The Manager shall not engage in the practice of medicine.”

Accepted:		CALIFORNIA RADIATION THERAPY MANAGEMENT SERVICES, INC.
		By:		/s/ Xxxxx N.T. Xxxxxx
				Xxxxx N.T. Xxxxxx
				Vice President
Accepted:		21ST CENTURY ONCOLOGY OF CALIFORNIA, A MEDICAL CORPORATION
		By:		/s/ Xxxxxx X. Xxxxxxxx
				Xxxxxx X. Xxxxxxxx, M.D.
				Vice President

EXHIBIT B

THIRD ADDENDUM TO MANAGEMENT SERVICES AGREEMENT

Office Locations and Manager Compensation

Office Location		Manager Compensation as a % of Net Collected Dollars
Palm Desert 00000 Xxxxx Xxxx Xxxx Xxxxxx, XX 00000		77%
Santa Xxxxxx 0000 Xxxxx Xxxxxx Xxxxxxxxx Xxxxx 000 Xxxxx Xxxxxx, XX 00000		77%
Xxxxxxx Hills Radiation Oncology 000 X. Xxxxxxxxx Xxxx. Xxxxx 000 Xxxxxxx Xxxxx, XX 00000		77%
Vidya X. Xxxxx, M.D., Inc. 000 Xxxxx Xxxxxx Xxxxxxx, XX 00000		77%