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      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>1</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <CntrctRcvdGreaterThan100KCnt>0</CntrctRcvdGreaterThan100KCnt>
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        <ExclusionAmt>464174</ExclusionAmt>
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        <ExclusionAmt>105</ExclusionAmt>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
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        <ProgramServicesAmt>75746</ProgramServicesAmt>
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        <ManagementAndGeneralAmt>17680</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>37219</ManagementAndGeneralAmt>
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        <FundraisingAmt>20429</FundraisingAmt>
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        <ProgramServicesAmt>308</ProgramServicesAmt>
        <ManagementAndGeneralAmt>12127</ManagementAndGeneralAmt>
        <FundraisingAmt>469</FundraisingAmt>
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        <ManagementAndGeneralAmt>3265</ManagementAndGeneralAmt>
        <FundraisingAmt>14239</FundraisingAmt>
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        <ManagementAndGeneralAmt>4395</ManagementAndGeneralAmt>
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        <Desc>BAD DEBT EXPENSES</Desc>
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        <FundraisingAmt>15000</FundraisingAmt>
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      <OtherExpensesGrp>
        <Desc>FUNDRAISING EXPENSES</Desc>
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        <FundraisingAmt>12650</FundraisingAmt>
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      <OtherExpensesGrp>
        <Desc>DUES AND PUBLICATIONS</Desc>
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        <ProgramServicesAmt>8705</ProgramServicesAmt>
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        <FundraisingAmt>407</FundraisingAmt>
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        <EOYAmt>2757423</EOYAmt>
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        <BOYAmt>0</BOYAmt>
        <EOYAmt>30584</EOYAmt>
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        <BOYAmt>16890609</BOYAmt>
        <EOYAmt>18112982</EOYAmt>
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        <EOYAmt>9262</EOYAmt>
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        <EOYAmt>25455</EOYAmt>
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      <OtherLiabilitiesGrp>
        <BOYAmt>9198</BOYAmt>
        <EOYAmt>0</EOYAmt>
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      <TotalLiabilitiesGrp>
        <BOYAmt>83412</BOYAmt>
        <EOYAmt>34717</EOYAmt>
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      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
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        <EOYAmt>2810293</EOYAmt>
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        <BOYAmt>14085989</BOYAmt>
        <EOYAmt>15267972</EOYAmt>
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        <BOYAmt>16807197</BOYAmt>
        <EOYAmt>18078265</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>16890609</BOYAmt>
        <EOYAmt>18112982</EOYAmt>
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      <ReconcilationRevenueExpnssAmt>19879</ReconcilationRevenueExpnssAmt>
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      <PriorPeriodAdjustmentsAmt>44737</PriorPeriodAdjustmentsAmt>
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      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <ConsolAndSepBasisFinclStmtInd>X</ConsolAndSepBasisFinclStmtInd>
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      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
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    <IRS990ScheduleA documentId="RetDoc1039100001">
      <PublicOrganization170Ind>X</PublicOrganization170Ind>
      <GiftsGrantsContriRcvd170Grp>
        <CurrentTaxYearMinus4YearsAmt>619829</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>422102</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>357251</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>306073</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>310990</CurrentTaxYearAmt>
        <TotalAmt>2016245</TotalAmt>
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      <TotalCalendarYear170Grp>
        <CurrentTaxYearMinus4YearsAmt>619829</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>422102</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>357251</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>306073</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>310990</CurrentTaxYearAmt>
        <TotalAmt>2016245</TotalAmt>
      </TotalCalendarYear170Grp>
      <SubstantialContributorsTotAmt>230432</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>1785813</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>402347</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>717127</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>326315</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>364068</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>464174</CurrentTaxYearAmt>
        <TotalAmt>2274031</TotalAmt>
      </GrossInvestmentIncome170Grp>
      <OtherIncome170Grp>
        <CurrentTaxYearAmt>105</CurrentTaxYearAmt>
        <TotalAmt>105</TotalAmt>
      </OtherIncome170Grp>
      <TotalSupportAmt>4290381</TotalSupportAmt>
      <PublicSupportCY170Pct>0.41620</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.41520</PublicSupportPY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
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    <IRS990ScheduleB documentId="RetDoc1234500001">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
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        <ContributionsAmt>14463</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>1525953</InvestmentEarningsOrLossesAmt>
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        <EndYearBalanceAmt>14887808</EndYearBalanceAmt>
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      <CYMinus1YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>12126787</BeginningYearBalanceAmt>
        <ContributionsAmt>13519</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>1768305</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>259927</OtherExpendituresAmt>
        <EndYearBalanceAmt>13648684</EndYearBalanceAmt>
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      <CYMinus2YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>13733831</BeginningYearBalanceAmt>
        <ContributionsAmt>21583</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>-1448434</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>180193</OtherExpendituresAmt>
        <EndYearBalanceAmt>12126787</EndYearBalanceAmt>
      </CYMinus2YrEndwmtFundGrp>
      <CYMinus3YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>12559469</BeginningYearBalanceAmt>
        <ContributionsAmt>12685</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>1343949</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>182272</OtherExpendituresAmt>
        <EndYearBalanceAmt>13733831</EndYearBalanceAmt>
      </CYMinus3YrEndwmtFundGrp>
      <CYMinus4YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>11274198</BeginningYearBalanceAmt>
        <ContributionsAmt>70506</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>1437601</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>222836</OtherExpendituresAmt>
        <EndYearBalanceAmt>12559469</EndYearBalanceAmt>
      </CYMinus4YrEndwmtFundGrp>
      <BoardDesignatedBalanceEOYPct>0.00000</BoardDesignatedBalanceEOYPct>
      <PrmnntEndowmentBalanceEOYPct>0.68540</PrmnntEndowmentBalanceEOYPct>
      <TermEndowmentBalanceEOYPct>0.31460</TermEndowmentBalanceEOYPct>
      <EndowmentsHeldUnrelatedOrgInd>0</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>0</EndowmentsHeldRelatedOrgInd>
      <TotalBookValueLandBuildingsAmt>0</TotalBookValueLandBuildingsAmt>
      <OtherSecuritiesGrp>
        <Desc>PARTNERS GROUP PRIVATE EQUITY MASTER FUND</Desc>
        <BookValueAmt>1259043</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
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      <OtherSecuritiesGrp>
        <Desc>TA REALTY CORE PROPERTY FUND</Desc>
        <BookValueAmt>673270</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
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      <OtherSecuritiesGrp>
        <Desc>BLACKSTONE BREIT</Desc>
        <BookValueAmt>333259</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
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      <OtherSecuritiesGrp>
        <Desc>SKYBRIDGE MULTI-ADVISER HEDGE FUND</Desc>
        <BookValueAmt>131604</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
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      <OtherSecuritiesGrp>
        <Desc>AG TWIN BROOK</Desc>
        <BookValueAmt>360247</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
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      <TotalBookValueSecuritiesAmt>2757423</TotalBookValueSecuritiesAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>2157469</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>1206452</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>1206452</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>951017</RevenueSubtotalAmt>
      <InvestmentExpensesNotIncldAmt>37219</InvestmentExpensesNotIncldAmt>
      <OtherRevenuesNotIncludedAmt>-4390</OtherRevenuesNotIncludedAmt>
      <RevenueNotReportedFinclStmtAmt>32829</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>983846</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>886401</TotExpnsEtcAuditedFinclStmtAmt>
      <PriorYearAdjustmentsAmt>-44737</PriorYearAdjustmentsAmt>
      <OtherExpensesIncludedAmt>4390</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>-40347</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>926748</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>37219</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>37219</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>963967</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>ROI INTENDS TO USE THESE ENDOWMENT FUNDS TO SUPPORT PROGRAMS THAT PROMOTE THE ACHIEVEMENT OF ITS MISSION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>ROI PERFORMED AN EVALUATION OF UNCERTAINTY IN INCOME TAXES FOR THE YEAR ENDED DECEMBER 31, 2024, AND DETERMINED THAT THERE ARE NO MATTERS THAT WOULD REQUIRE RECOGNITION IN THE FINANCIAL STATEMENTS OR THAT MAY HAVE ANY EFFECT ON ITS TAX-EXEMPT STATUS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>FUNDRAISING EVENT NET INCOME -4,390.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>FUNDRAISING EVENT EXPENSES 4,390.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleG documentId="RetDoc1041300001">
      <FundraisingEventInformationGrp>
        <Event1Nm>5K RUN</Event1Nm>
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        <CharitableContriEvent1Amt>39929</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>5606</GrossRevenueEvent1Amt>
        <OtherDirectExpensesEvent1Amt>4390</OtherDirectExpensesEvent1Amt>
        <GrossReceiptsTotalAmt>45535</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>39929</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>5606</GrossRevenueTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>4390</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>4390</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>1216</NetIncomeSummaryAmt>
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    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
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          <BusinessNameLine1Txt>UNIVERSITY HOSPITALS OF CLEVELAND</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>11100 EUCLID AVE</AddressLine1Txt>
          <CityNm>CLEVELAND</CityNm>
          <StateAbbreviationCd>OH</StateAbbreviationCd>
          <ZIPCd>44106</ZIPCd>
        </USAddress>
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        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>52000</CashGrantAmt>
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      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>BAYLOR COLLEGE OF MEDICINE</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>ONE BAYLOR PLAZA</AddressLine1Txt>
          <CityNm>HOUSTON</CityNm>
          <StateAbbreviationCd>TX</StateAbbreviationCd>
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        </USAddress>
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        <PurposeOfGrantTxt>RESEARCH AWARD</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>JOHNS HOPKINS UNIVERSITY</BusinessNameLine1Txt>
        </RecipientBusinessName>
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          <CityNm>BALTIMORE</CityNm>
          <StateAbbreviationCd>MD</StateAbbreviationCd>
          <ZIPCd>21211</ZIPCd>
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        <RecipientEIN>520595110</RecipientEIN>
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      <RecipientTable>
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      <RecipientTable>
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          <BusinessNameLine1Txt>BRIGHAM AND WOMEN'S HOSPITAL</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>75 FRANCIS ST</AddressLine1Txt>
          <CityNm>BOSTON</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02115</ZIPCd>
        </USAddress>
        <RecipientEIN>042312909</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>28820</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>RESEARCH AWARD</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>THE REGENTS OF THE UNIVERSITY OF CALIFORNIA LOS ANGELES</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>10889 WILSHIRE BOULEVARD</AddressLine1Txt>
          <CityNm>LOS ANGELES</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>90095</ZIPCd>
        </USAddress>
        <RecipientEIN>956006143</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>25455</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>RESEARCH AWARD</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>THE REGENTS OF THE UNIVERSITY OF CALIFORNIA SAN FRANCISCO</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>3333 CALIFORNIA STREET</AddressLine1Txt>
          <CityNm>SAN FRANCISCO</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>94143</ZIPCd>
        </USAddress>
        <RecipientEIN>946036493</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>25000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>RESEARCH AWARD</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>NYU SCHOOL OF MEDICINE</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>550 FIRST AVENUE</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10016</ZIPCd>
        </USAddress>
        <RecipientEIN>135562308</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>25000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>RESEARCH AWARD</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>AMERICAN SOCIETY FOR RADIATION ONCOLOGY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>251 18TH STREET SOUTH 8TH FLOOR</AddressLine1Txt>
          <CityNm>ARLINGTON</CityNm>
          <StateAbbreviationCd>VA</StateAbbreviationCd>
          <ZIPCd>22202</ZIPCd>
        </USAddress>
        <RecipientEIN>420943164</RecipientEIN>
        <IRCSectionDesc>501(C)(6)</IRCSectionDesc>
        <CashGrantAmt>10000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>2024 ROI SUPPORT TO ARRO WEBINAR</PurposeOfGrantTxt>
      </RecipientTable>
      <Total501c3OrgCnt>9</Total501c3OrgCnt>
      <TotalOtherOrgCnt>1</TotalOtherOrgCnt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>SIGNED AWARD LETTERS OUTLINE THE TERMS AND CONDITIONS OF ACCEPTANCE AND USE OF THE RESEARCH AWARD. AS PER THE SIGNED AGREEMENT, AN INTERIM PROGRESS REPORT AND A FINAL REPORT ARE COLLECTED WHICH SUMMARIZE PROGRESS MADE AND EXPENDITURES.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
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      <SupplementalNonqualRtrPlanInd>1</SupplementalNonqualRtrPlanInd>
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      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
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      <CompBsdNetEarnsRltdOrgsInd>0</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>0</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>LAURA I THEVENOT EXEC DIR</PersonNm>
        <TitleTxt>SECR AND ASST TREAS UNTIL 11/24</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>609347</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>124274</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>71664</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>45500</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>23593</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>874378</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>ROI DOES NOT DIRECTLY HIRE OR COMPENSATE EMPLOYEES. ALL EMPLOYEES ARE EMPLOYEES OF THE AMERICAN SOCIETY FOR RADIATION ONCOLOGY (ASTRO), A RELATED ORGANIZATION EXEMPT UNDER SECTION 501(C)(6). AN INDEPENDENT CONSULTANT PERFORMED A MARKET SURVEY TO DEVELOP SALARY STRUCTURE AND RANGES. ASTRO'S PRACTICE IS TO COMPLETE A MARKET SURVEY EVERY THREE YEARS; THIS WAS LAST COMPLETED FOR THE EX-OFFICIO, EXECUTIVE DIRECTOR IN 2024. THE EX-OFFICIO, EXECUTIVE DIRECTOR'S COMPENSATION IS DETERMINED BY A SUBCOMMITTEE OF THE BOARD USING COMPARABLE SALARIES OF SIMILAR EXECUTIVE DIRECTOR POSITIONS OF NONPROFIT MEDICAL ORGANIZATIONS. THIS REVIEW WAS DISCUSSED WITH THE BOARD OF DIRECTORS AND THE FINAL DETERMINATION WAS MADE BY THE EXECUTIVE COMMITTEE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 4B</FormAndLineReferenceDesc>
        <ExplanationTxt>DURING THE YEAR ENDED DECEMBER 31, 2024, LAURA THEVENOT, CEO OF ASTRO UNTIL 11/24, PARTICIPATED IN A 457(F) NONQUALIFIED PLAN, WITH CONTRIBUTIONS OF THE PLAN OF $11,000.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL MANAGEMENT FUNCTIONS OF ROI ARE CONTROLLED BY THE AMERICAN SOCIETY FOR RADIATION ONCOLOGY (ASTRO), A RELATED ORGANIZATION EXEMPT UNDER SECTION 501(C)(6).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FEDERAL FORM 990 IS PREPARED BY OUR EXTERNAL TAX ACCOUNTANTS. THE DRAFT IS PROVIDED TO OUR FINANCE STAFF FOR REVIEW BEFORE BEING SUBMITTED TO THE VP FINANCE &amp; ADMINISTRATION, EXECUTIVE DIRECTOR, AND TREASURER OF ROI FOR THEIR REVIEW AND APPROVAL. THE REVISED DRAFT IS THEN PROVIDED TO THE FULL BOARD OF TRUSTEES PRIOR TO FILING WITH THE INTERNAL REVENUE SERVICE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ROI'S OFFICERS, DIRECTORS, KEY EMPLOYEES, AND VOLUNTEERS ARE REQUIRED TO FILL OUT DISCLOSURE FORMS ON AN ANNUAL BASIS AND TO UPDATE THEIR DISCLOSURE FORMS UPON ANY MATERIAL CHANGE IN THE INTERIM. THESE DISCLOSURE FORMS ARE REVIEWED IN ORDER TO IDENTIFY AND ADDRESS ANY POTENTIAL CONFLICTS OF THESE INDIVIDUALS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>AUDITED FINANCIAL STATEMENTS, 990 FORMS AND GOVERNING DOCUMENTS AND CONFLICT OF INTEREST POLICIES ARE AVAILABLE ON OUR WEBSITE.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
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        <DisregardedEntityName>
          <BusinessNameLine1Txt>AMERICAN SOCIETY FOR RADIATION ONCOLOGY</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>251 18TH STREET SOUTH 8TH FLOOR</AddressLine1Txt>
          <CityNm>ARLINGTON</CityNm>
          <StateAbbreviationCd>VA</StateAbbreviationCd>
          <ZIPCd>22202</ZIPCd>
        </USAddress>
        <EIN>420943164</EIN>
        <PrimaryActivitiesTxt>MEMBERSHIP SOCIETY</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(6)</ExemptCodeSectionTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>1</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>1</GiftGrntCapContriFromOthOrgInd>
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      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>0</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>1</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>1</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>1</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>1</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>AMERICAN SOCIETY FOR RADIATION ONCOLOGY</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>B</TransactionTypeTxt>
        <InvolvedAmt>10000</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ACTUAL</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>AMERICAN SOCIETY FOR RADIATION ONCOLOGY</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>C</TransactionTypeTxt>
        <InvolvedAmt>14463</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ACTUAL</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>AMERICAN SOCIETY FOR RADIATION ONCOLOGY</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>N</TransactionTypeTxt>
        <InvolvedAmt>78330</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>FMV</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>AMERICAN SOCIETY FOR RADIATION ONCOLOGY</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>O</TransactionTypeTxt>
        <InvolvedAmt>347510</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>FMV</MethodOfAmountDeterminationTxt>
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      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>AMERICAN SOCIETY FOR RADIATION ONCOLOGY</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>P</TransactionTypeTxt>
        <InvolvedAmt>30959</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ACTUAL</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>AMERICAN SOCIETY FOR RADIATION ONCOLOGY</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>Q</TransactionTypeTxt>
        <InvolvedAmt>6497</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ACTUAL</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
    </IRS990ScheduleR>
  </ReturnData>
</Return>