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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>UNCERTAIN TAX POSITIONS UNDER ASC 740 GAAP PRESCRIBES A MINIMUM RECOGNITION THRESHOLD THAT A TAX POSITION IS REQUIRED TO MEET IN ORDER TO BE RECOGNIZED IN THE FINANCIAL STATEMENTS. AACR BELIEVES THAT THEY HAD NO UNCERTAIN TAX POSITIONS AS DEFINED IN GAAP.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>REVENUE OF AFFILIATES 70,376,900. INVESTMENT MANAGEMENT FEES -301,778.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>INTERCOMPANY REVENUE 66,220,426.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>EXPENSES OF AFFILIATES 69,686,051.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>INTERCOMPANY EXPENSES 66,220,426.</ExplanationTxt>
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    </IRS990ScheduleD>
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        <EmployeeCnt>0</EmployeeCnt>
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      <AccountActivitiesOutsideUSGrp>
        <RegionTxt>EUROPE (INCLUDING ICELAND &amp; GREENLAND)</RegionTxt>
        <OfficesCnt>0</OfficesCnt>
        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>GRANTS TO RECIPIENTS LOCATED IN REGION</TypeOfActivitiesConductedTxt>
        <SpecificServicesProvidedTxt>GRANT MAKING</SpecificServicesProvidedTxt>
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      <SubtotalEmployeesCnt>0</SubtotalEmployeesCnt>
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      <ContinuationTotalEmployeeCnt>0</ContinuationTotalEmployeeCnt>
      <TotalOfficeCnt>0</TotalOfficeCnt>
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      <SubtotalSpentAmt>13814283</SubtotalSpentAmt>
      <ContinuationSpentAmt>0</ContinuationSpentAmt>
      <TotalSpentAmt>13814283</TotalSpentAmt>
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        <TypeOfAssistanceTxt>RESEARCH &amp; SCIENTIFIC AWARDS</TypeOfAssistanceTxt>
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        <CashGrantAmt>2546283</CashGrantAmt>
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        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>150000</CashGrantAmt>
        <MannerOfCashDisbursementTxt>CHECK</MannerOfCashDisbursementTxt>
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      <ForeignIndividualsGrantsGrp>
        <TypeOfAssistanceTxt>PRE-POST DOCTORAL FELLOWSHIPS</TypeOfAssistanceTxt>
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        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>60000</CashGrantAmt>
        <MannerOfCashDisbursementTxt>CHECK</MannerOfCashDisbursementTxt>
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      <ForeignCorpOwnershipInd>0</ForeignCorpOwnershipInd>
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        <ExplanationTxt>ALL GRANTEES ARE REQUIRED TO PROVIDE YEARLY PROGRESS REPORTS. ALL BUDGET ITEMS MUST BE JUSTIFIED IN CONNECTION WITH THE PROGRAM GUIDELINES; ANY DISCREPANCY OR UNEXPECTED FUNDS MUST BE RETURNED TO THE GRANTOR.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 3:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION USES THE ACCRUAL METHOD TO ACCOUNT FOR EXPENDITURES.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III ACCOUNTING METHOD:</FormAndLineReferenceDesc>
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        <GrantTypeTxt>PRE &amp; POST DOCTORAL FELLOWSHIPS</GrantTypeTxt>
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        <CashGrantAmt>2035000</CashGrantAmt>
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      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>SCIENTIFIC AWARDS</GrantTypeTxt>
        <RecipientCnt>18</RecipientCnt>
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      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>TRAVEL AWARDS</GrantTypeTxt>
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        <ExplanationTxt>ALL GRANTEES ARE REQUIRED TO PROVIDE YEARLY PROGRESS REPORTS. ALL BUDGET ITEMS MUST BE JUSTIFIED IN CONNECTION WITH THE PROGRAM GUIDELINES; ANY DISCREPANCY OR UNEXPECTED FUNDS MUST BE RETURNED TO THE GRANTOR.</ExplanationTxt>
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        <PersonNm>DR MARGARET FOTI</PersonNm>
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        <PersonNm>MICHAEL STEWART</PersonNm>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JON RETZLAFF</PersonNm>
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        <DeferredCompensationFlngOrgAmt>26400</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>390157</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>CHRISTINE BATTLE</PersonNm>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>YIXIAN ZHANG</PersonNm>
        <TitleTxt>SR. DIRECTOR / SCIENTIFIC REVIEW AND</TitleTxt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>RICHARD BUCK</PersonNm>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JOSEPH PONTOSKI</PersonNm>
        <TitleTxt>MANAGING DIRECTOR / FINANCE</TitleTxt>
        <BaseCompensationFilingOrgAmt>231374</BaseCompensationFilingOrgAmt>
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        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>278318</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>SCHEDULE J, PART I, LINE 1A: FIRST-CLASS OR CHARTER TRAVEL IT IS THE POLICY OF THE ASSOCIATION TO AUTHORIZE FIRST CLASS TRAVEL ARRANGEMENTS FOR THE CHIEF EXECUTIVE OFFICER IN ORDER TO ACCOMMODATE BUSINESS TRAVEL SCHEDULES AND FACILITATE ONGOING BUSINESS TRANSACTIONS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART II: OTHER REPORTABLE COMPENSATION</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EMPLOYMENT CONTRACT FOR THE AACR CEO CALLS FOR ANNUAL CONTRIBUTIONS TO A DEFERRED COMPENSATION PLAN. DUE TO STATUTORY AND REGULATORY REQUIREMENTS, A PORTION OF THESE ANNUAL PAYMENTS CAN NO LONGER BE DEFERRED INTO A QUALIFIED PLAN AND MUST BE PAID OUT ANNUALLY AND CLASSIFIED AS OTHER REPORTABLE COMPENSATION. IN ADDITION, THE COMPANY PROVIDES AN ANNUAL CAR ALLOWANCE THAT IS ALSO INCLUDED AS PART OF OTHER COMPENSATION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART II: BONUS AND INCENTIVE COMPENSATION</FormAndLineReferenceDesc>
        <ExplanationTxt>IN 2019, THE AACR CEO RECEIVED A ONE-TIME PAYMENT OF $382,000 ASSOCIATED WITH THE DEFERRAL OF MERIT INCREASES FOR THE PAST SIX YEARS 2013-2018.</ExplanationTxt>
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    </IRS990ScheduleJ>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS THE ORGANIZATION HAS ONE CLASS OF VOTING MEMBER. EACH VOTING MEMBER IS ELIGIBLE TO VOTE OR TO HOLD THE OFFICE AND HAS THE SAME VOTING RIGHT - ONE VOTE PER MEMBER.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>ELECTION OF MEMBERS OF GOVERNING BODY ELECTION OF MEMBERS OF THE GOVERNING BODY SHALL BE BY BALLOT DISTRIBUTED TO VOTING MEMBERS OF THE ORGANIZATION. THE CANDIDATE RECEIVING THE HIGHEST NUMBER OF VOTES CAST SHALL BE ELECTED.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>GOVERNING BODY DECISIONS SUBJECT TO APPROVAL BY MEMBERS DECISIONS OF THE BOARD TO AMEND THE BY-LAWS OR TO AUTHORIZE THE ESTABLISHMENT OF A LOCAL SECTION REQUIRE APPROVAL BY MEMBERSHIP OF THE ASSOCIATION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>GOVERNING BODY REVIEW OF FORM 990 PRIOR TO ITS FILING WITH THE IRS, A COPY OF THE FINAL FORM 990 IS PROVIDED TO EACH VOTING MEMBER OF THE GOVERNING BODY AND TO THE FINANCE AND AUDIT COMMITTEE ON AN ANNUAL BASIS AS PART OF THEIR FIDUCIARY RESPONSIBILITY TO UNDERSTAND AND REVIEW THE ORGANIZATION'S FINANCES.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>MONITORING AND ENFORCEMENT OF CONFLICT OF INTEREST POLICY EACH VOTING MEMBER OF THE GOVERNING BODY IS REQUIRED TO ANNUALLY ACKNOWLEDGE ANY CONFLICTS BY SIGNING THE CORPORATE CONFLICT OF INTEREST STATEMENT AND DETAILING ALL POTENTIAL CONFLICTS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>PROCESS FOR DETERMINING COMPENSATION INDEPENDENT DATA DETAILING COMPARABLE COMPENSATION IS PURCHASED ANNUALLY AND PROVIDED TO A COMPENSATION COMMITTEE WHICH EVALUATES SALARY LEVELS IN COMPARISON TO PEER GROUPS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>PUBLIC AVAILABILITY OF OTHER DOCUMENTS THE FINANCIAL STATEMENTS AND FORM 990 ARE POSTED ON THE ORGANIZATION'S WEBSITE (WWW.AACR.ORG). THEY WILL BE PROVIDED ON REQUEST, AND ARE ALSO AVAILABLE FOR INSPECTION AT THE ORGANIZATION'S OFFICE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VII, SECTION A, COMPENSATION FROM RELATED ORGANIZATION</FormAndLineReferenceDesc>
        <ExplanationTxt>FOR THE CEO AND CFO, THE ALLOCATION IS BASED UPON AN ESTIMATE OF THE AMOUNT OF THEIR TIME SPENT IN THIS AREA - 10% FOR THE CEO, 5% FOR THE CFO.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>CHANGE IN INTEREST IN NET ASSETS OF AFFILIATE-WITHOUT DONOR RESTRICTIONS 554,372. CHANGE IN INTEREST IN NET ASSETS OF AFFILIATE-WITH DONOR RESTRICTIONS 130,972.</ExplanationTxt>
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        <FormAndLineReferenceDesc>SCHEDULE R, PART II, COL B: PRIMARY ACTIVITY</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PURPOSE OF THE AACR FOUNDATION IS TO RAISE FUNDS AND SOLICIT GRANTS AND CONTRIBUTIONS TO BENEFIT, SUPPORT AND PROMOTE ITS PARENT ORGANIZATION - AACR'S MISSION IS DESCRIBED ON PAGE 2, PART III. THE PURPOSE OF AACR INTERNATIONAL - CANADA IS TO PROMOTE HEALTH BY SUPPORTING, MANAGING AND CONDUCTING NEW AND INNOVATIVE RESEARCH FOR THE CURE, PREVENTION AND TREATMENT OF CANCER, AND BY FOSTERING COLLABORATION AMONGST SCIENTISTS ENGAGED IN CANCER RESEARCH. IT INTENDS TO ADVANCE EDUCATION BY DEVELOPING AND OPERATING PROGRAMS, CONFERENCES, SEMINARS AND WORKSHOPS DESIGNED TO TRAIN STUDENTS AND SCIENTISTS AND ADVANCE THEIR UNDERSTANDING OF CANCER ETIOLOGY, PREVENTION, DIAGNOSIS AND TREATMENT.</ExplanationTxt>
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          <AddressLine1Txt>615 CHESTNUT STREET 17TH FLOOR</AddressLine1Txt>
          <CityNm>PHILADELPHIA</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19106</ZIPCd>
        </USAddress>
        <EIN>233100004</EIN>
        <PrimaryActivitiesTxt>SEE SCHEDULE O FOR DETAILS</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>PA</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 12A, I</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>AMERICAN ASSOCIATION FOR CANCER RESEARCH INC</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>1</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>AMERICAN ASSOCIATION FOR CANCER RESEARCH INTERNATIONAL - CANADA</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <ForeignAddress>
          <AddressLine1Txt>C/O TMF CANADA MANAGEMENT INC 330</AddressLine1Txt>
          <CityNm>TORONTO</CityNm>
          <ProvinceOrStateNm>ONTARIO</ProvinceOrStateNm>
          <CountryCd>CA</CountryCd>
        </ForeignAddress>
        <PrimaryActivitiesTxt>SEE SCHEDULE O FOR DETAILS</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>CA</LegalDomicileForeignCountryCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 10</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>AMERICAN ASSOCIATION FOR CANCER RESEARCH INC</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>1</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>0</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>1</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>1</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>1</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>0</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>1</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>1</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>AMERICAN ASSOCIATION FOR CANCER RESEARCH FOUNDATION (SUPPORTING ORG)</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>C</TransactionTypeTxt>
        <InvolvedAmt>64815426</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ACCRUAL METHOD</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>AMERICAN ASSOCIATION FOR CANCER RESEARCH FOUNDATION (SUPPORTING ORG)</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>R</TransactionTypeTxt>
        <InvolvedAmt>1405000</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ACCRUAL METHOD</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
    </IRS990ScheduleR>
  </ReturnData>
</Return>