RADIATION THERAPY SERVICES INC
ADDENDUM
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<TYPE>EX-10.33
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 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="right"><FONT FACE="Times New Roman" SIZE="2"><B>Exhibit 10.33 </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT
FACE="Times New Roman" SIZE="2"><B><U>ADDENDUM TO ADMINISTRATIVE SERVICES AGREEMENT </U></B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">This Addendum (the &#147;Addendum&#148;) is
entered into as of January 1, 2007, by and among MARYLAND RADIATION THERAPY MANAGEMENT SERVICES, INC., a Maryland corporation (&#148;MANAGEMENT SERVICES&#148;) and KATIN RADIATION THERAPY, P.A., a Maryland professional corporation (the
&#147;PA&#148;). This Addendum amends Section 3.1 of the Administrative Services Agreement dated October 31, 1998 between the parties (the &#147;Agreement&#148;) to adjust the monthly Service Fee of $12,500.00 paid in 2006 to a monthly Service Fee
of $16,667.67, and replaces the Addendum of that same Section dated January 1, 2006. From and after the date hereof, Section 3.1 shall read as follows: </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:8%; text-indent:4%"><FONT
FACE="Times New Roman" SIZE="2">3.1. <U>Service Fee.</U> For the services to be provided hereunder by MANAGEMENT SERVICES, the PA shall pay to MANAGEMENT SERVICES a monthly Service Fee of $16,667.67. The parties agree that the Service Fee represents
the fair market value of the services provided by MANAGEMENT SERVICES hereunder and that the parties shall meet annually to reevaluate the value of services provided by MANAGEMENT SERVICES and shall establish the fair market value thereof for
purposes of this Section 3.1. </FONT></P> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD VALIGN="top"> <P STYLE="margin-left:2.00em; text-indent:2.00em"><FONT FACE="Times New Roman" SIZE="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Accepted:</FONT></P></TD>
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<TD VALIGN="bottom" COLSPAN="3"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">MARYLAND RADIATION THERAPY</FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT FACE="Times New Roman" SIZE="2">MANAGEMENT
SERVICES, INC.</FONT></P></TD></TR>
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<TD VALIGN="bottom"><FONT FACE="Times New Roman" SIZE="2">By:</FONT></TD>
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<TD VALIGN="bottom"> <P STYLE="margin-bottom:1px;border-bottom:1px solid #000000"><FONT FACE="Times New Roman" SIZE="2">/s/ David Koeninger</FONT></P></TD></TR>
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<TD VALIGN="bottom"><FONT FACE="Times New Roman" SIZE="2">David Koeninger</FONT></TD></TR>
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<TD VALIGN="bottom"><FONT FACE="Times New Roman" SIZE="2">Vice President &amp; CFO</FONT></TD></TR>
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<TD VALIGN="top"> <P STYLE="margin-left:2.00em; text-indent:2.00em"><FONT FACE="Times New Roman" SIZE="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Accepted:</FONT></P></TD>
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<TD VALIGN="bottom" COLSPAN="3"><FONT FACE="Times New Roman" SIZE="2">KATIN RADIATION THERAPY, P.A.</FONT></TD></TR>
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<TD VALIGN="bottom"> <P STYLE="margin-bottom:1px;border-bottom:1px solid #000000"><FONT FACE="Times New Roman" SIZE="2">/s/ Daniel E. Dosoretz, M.D.</FONT></P></TD></TR>
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<TD VALIGN="bottom"><FONT FACE="Times New Roman" SIZE="2">Daniel E. Dosoretz, M.D.</FONT></TD></TR>
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<TD VALIGN="bottom"><FONT FACE="Times New Roman" SIZE="2">Vice President</FONT></TD></TR>
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