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      <FootnoteTextInd>X</FootnoteTextInd>
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        <ExplanationTxt>The Foundation is subject to the provisions of the Financial Accounting Standards Board's ("FASB") Accounting Standards Codification ("ASC") Topic 740, Income Taxes, relating to the accounting and reporting for uncertainty in income taxes. Because of the Foundation's general tax-exempt status, management believes ASC Topic 740 has not had, and is not expected to have, a material impact on the Foundation's financial statements.</ExplanationTxt>
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          <CityNm>Baltimore</CityNm>
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      <RecipientTable>
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      <RecipientTable>
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      <RecipientTable>
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          <CityNm>SEATTLE</CityNm>
          <StateAbbreviationCd>WA</StateAbbreviationCd>
          <ZIPCd>98109</ZIPCd>
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      <SupplementalInformationDetail>
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        <ExplanationTxt>THE FOUNDATION REQUIRES GRANT RECIPIENTS TO COMPLY WITH STATED TERMS AND CONDITIONS GOVERNING EACH RESEARCH PROGRAM AWARDED, INCLUDING THE SUBMISSION OF PROGRESS REPORTS. DISBURSEMENT OF FUNDS IS CONTINGENT UPON ACCEPTANCE OF THESE TERMS AND TIMELY SUBMISSION OF REPORTS.</ExplanationTxt>
      </SupplementalInformationDetail>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>BOTH MEMBERS OF THE BOARD OF DIRECTORS ARE EMPLOYEES OF PAMPLONA CAPITAL MANAGEMENT LLC. ALEX KNASTER (FOUNDER OF THE MARK FOUNDATION FOR CANCER RESEARCH (U.S.) LTD.) IS THE FOUNDER AND CEO OF PAMPLONA CAPITAL MANAGEMENT LLC. MR. KNASTER DOES NOT HOLD A BOARD SEAT ON THE FOUNDATION'S BOARD.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 8B</FormAndLineReferenceDesc>
        <ExplanationTxt>GIVEN THE CURRENT SIZE OF THE FOUNDATION'S BOARD OF DIRECTORS, THE FOUNDATION HAS YET TO CREATE COMMITTEES. ALL BUSINESS OF THE FOUNDATION IS CONDUCTED BY THE TWO DIRECTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>A COPY OF THE FOUNDATION'S 990 IS PROVIDED TO THE GOVERNING BODY FOR REVIEW AND COMMENT PRIOR TO ITS ELECTRONIC FILING WITH THE INTERNAL REVENUE SERVICE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL MEMBERS OF THE BOARD OF DIRECTORS AND KEY MEMBERS OF MANAGEMENT ARE REQUIRED TO REVIEW THE CONFLICT OF INTEREST POLICY AND SIGN IT ON AN ANNUAL BASIS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE CHIEF EXECUTIVE OFFICER WAS HIRED BY THE BOARD OF DIRECTORS IN 2016. AS PART OF HER RECRUITMENT PROCESS, HER COMPENSATION WAS REVIEWED BY THE BOARD USING COMPARABLE MARKET DATA AND THE ASSISTANCE OF AN OUTSIDE RECRUITING FIRM. MS. CLEARY BEGAN WORK IN JANUARY 2017. COMPENSATION OF KEY EMPLOYEES IS DETERMINED BY THE CHIEF EXECUTIVE OFFICER AND APPROVED BY THE BOARD OF DIRECTORS ON AN ANNUAL BASIS, AS PART OF THE FOUNDATION'S BUDGET PROCESS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FOUNDATION'S FORM 990 IS AVAILABLE UPON REQUEST. GOVERNING DOCUMENTS ARE ONLY DISTRIBUTED INTERNALLY TO THE BOARD OF DIRECTORS AND MANAGEMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
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</Return>