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      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>6506608</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>748575</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>748575</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>5758033</RevenueSubtotalAmt>
      <InvestmentExpensesNotIncldAmt>18925</InvestmentExpensesNotIncldAmt>
      <RevenueNotReportedFinclStmtAmt>18925</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>5776958</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>4387602</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>4387602</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>18925</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>18925</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>4406527</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>ASTCT FOLLOWS THE FINANCIAL ACCOUNTING STANDARDS BOARD REQUIREMENTS FOR ACCOUNTING FOR UNCERTAIN TAX POSITIONS AND HAS DETERMINED IT IS NOT REQUIRED TO RECORD A LIABIITY FOR ANY SUCH POSITIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>0</GrantRecordsMaintainedInd>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>EDITORIAL AWARD</GrantTypeTxt>
        <RecipientCnt>2</RecipientCnt>
        <CashGrantAmt>10000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>ANNUAL MEETING TRAVEL GRANTS</GrantTypeTxt>
        <RecipientCnt>12</RecipientCnt>
        <CashGrantAmt>9000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
      </GrantsOtherAsstToIndivInUSGrp>
    </IRS990ScheduleI>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>AMENDED RETURN</FormAndLineReferenceDesc>
        <ExplanationTxt>THIS AMENDED 990 IS BEING SUBMITTED TO REFLECT ASTCT'S ACTIVITIES AND FINANCIAL POSITION BASED ON THE COMPLETION OF THE AUDIT OF ITS FINANCIAL STATEMENTS AS OF AND FOR THE YEAR ENDED DECEMBER 31, 2020, IN APRIL 2023. THE RETURN PREVIOUSLY FILED WAS BASED ON UNAUDITED DATA AND SHOULD BE CONSIDERED SUPERSEDED AND REPLACED IN ITS ENTIRETY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>ASTCT DELEGATED THE MANAGEMENT OF ITS DAILY OPERATIONS TO SMITHBUCKLIN CORPORATION IN CHICAGO. SMITHBUCKLIN CORPORATION IS A MANAGEMENT COMPANY WHICH MANAGES ALL ASPECTS OF THE ASSOCIATION IN ACCORDANCE WITH ASTCT'S BYLAWS AND POLICIES. OPERATIONS MAY INCLUDE, BUT ARE NOT LIMITED TO, ADMINISTRATION, MEMBERSHIP, FINANCE AND ACCOUNTING, EVENT PLANNING, EDUCATION, MARKETING, INFORMATION TECHNOLOGY, AND GOVERNANCE RELATIONS. SMITHBUCKLIN CORPORATION EMPLOYEES PROVIDE THESE SERVICES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>ASTCT HAS THE FOLLOWING CLASSES OF MEMBERSHIP: MEMBER, ASSOCIATE MEMBER, IN-TRAINING MEMBER, AFFILIATE MEMBER, AFFILIATE INSTITUTIONAL MEMBER, INTERNATIONAL MEMBER, EMERITUS MEMBER, AND HONORARY MEMBER. ONLY MEMBERS (AND HONORARY MEMBERS IF OTHERWISE QUALIFIED TO BE MEMBERS) ARE ENTITLED TO VOTE OF MATTERS SUBMITTED TO A VOTE OF THE MEMBERS. TO QUALIFY AS A MEMBER, AN APPLICANT SHALL HOLD AN MD OF PHD DEGREE, OR EQUIVALENT WITH DEMONSTRATED EXPERTISE IN MARROW TRANSPLANTATION AS EVIDENCED BY EITHER THE PUBLICATION OF TWO PAPERS ON MARROW TRANSPLANTATION-RELATED RESEARCH AS RECORDED BY CURRICULUM VITAE OR DOCUMENTATION OF TWO YEARS OF EXPERIENCE IN CLINICAL TRANSPLANTATION AS RECORDED BY CURRICULUM VITAE AND LETTER FROM THE DIRECTOR OF A TRANSPLANT CENTER ATTESTING TO THE EXPERIENCE OF THE CANDIDATE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>ASTCT'S FORM 990 IS PREPARED BY INDEPENDENT PUBLIC ACCOUNTANTS AND SUBMITTED TO ITS MANAGEMENT COMPANY AND TREASURER PRIOR TO FILING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>DIRECTORS AFFIRM THEIR ENDORSEMENT OF ASTCT'S CODE OF ETHICS AND CONFLICT OF INTEREST POLICY UPON ACCEPTING AND RETAINING OFFICE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIATION MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY AVAILABLE TO THE PUBLIC UPON WRITTEN REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>INSTRUCTORS &amp; HONORARIA: PROGRAM SERVICE EXPENSES 359,916. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 359,916. AUDIO VISUAL: PROGRAM SERVICE EXPENSES 321,144. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 321,144. ADVOCACY: PROGRAM SERVICE EXPENSES 199,411. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 199,411. OTHER: PROGRAM SERVICE EXPENSES 77,643. MANAGEMENT AND GENERAL EXPENSES 30,375. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 108,018.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>ASTCT'S BOARD OF DIRECTORS IS RESPONSIBLE FOR THE OVERSIGHT OF THE AUDIT AND SELECTION OF AN INDEPENDENT ACCOUNTANT. THIS PROCESS HAS NOT CHANGED FROM PRIOR YEARS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
