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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ENEIDA NEMECEK</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SHALINI SHENOY</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>KIRSTEN WILLIAMS</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ANDRE WILLIAMS</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <TotalReportableCompFromOrgAmt>6000</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
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      <IndivRcvdGreaterThan100KCnt>0</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
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      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
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            <BusinessNameLine1Txt>SMITHBUCKLIN CORPORATION</BusinessNameLine1Txt>
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        <ContractorAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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        <ContractorAddress>
          <USAddress>
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        </ContractorAddress>
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      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>NIMITT CONSULTING INC</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>2038 18TH ST NW SUITE 403</AddressLine1Txt>
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          </USAddress>
        </ContractorAddress>
        <ServicesDesc>CONSULTING</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>ELSEVIER INC</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>230 PARK AVENUE SUITE 800</AddressLine1Txt>
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            <StateAbbreviationCd>NY</StateAbbreviationCd>
            <ZIPCd>10169</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>PUBLISHING</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>CONFERENCE DIRECT</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>PO BOX 69777</AddressLine1Txt>
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          </USAddress>
        </ContractorAddress>
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      <CntrctRcvdGreaterThan100KCnt>9</CntrctRcvdGreaterThan100KCnt>
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      <TotalContributionsAmt>2534166</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>MEETINGS</Desc>
        <BusinessCd>900099</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>1654854</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
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        <BusinessCd>900099</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>990577</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
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        <RelatedOrExemptFuncIncomeAmt>803670</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>PUBLICATIONS</Desc>
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      <ProgramServiceRevenueGrp>
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        <ProgramServicesAmt>186956</ProgramServicesAmt>
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        <ProgramServicesAmt>393945</ProgramServicesAmt>
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      <OtherExpensesGrp>
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      <AllOtherExpensesGrp>
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      <DonorRestrictionNetAssetsGrp>
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      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
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      <GrassrootsNontaxableGrp>
        <FilingOrganizationsTotalAmt>123492</FilingOrganizationsTotalAmt>
      </GrassrootsNontaxableGrp>
      <TotLbbyngGrassrootMnsNonTxGrp>
        <FilingOrganizationsTotalAmt>0</FilingOrganizationsTotalAmt>
      </TotLbbyngGrassrootMnsNonTxGrp>
      <TotLbbyExpendMnsLbbyngNonTxGrp>
        <FilingOrganizationsTotalAmt>0</FilingOrganizationsTotalAmt>
      </TotLbbyExpendMnsLbbyngNonTxGrp>
      <AvgLobbyingNontaxableAmountGrp>
        <CurrentYearMinus3Amt>306732</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>381867</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>389869</CurrentYearMinus1Amt>
        <CurrentYearAmt>493966</CurrentYearAmt>
        <TotalAmt>1572434</TotalAmt>
      </AvgLobbyingNontaxableAmountGrp>
      <LobbyingCeilingAmt>2358651</LobbyingCeilingAmt>
      <AvgTotalLobbyingExpendGrp>
        <CurrentYearMinus3Amt>50000</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>60000</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>60000</CurrentYearMinus1Amt>
        <CurrentYearAmt>60000</CurrentYearAmt>
        <TotalAmt>230000</TotalAmt>
      </AvgTotalLobbyingExpendGrp>
      <AvgGrassrootsNontaxableGrp>
        <CurrentYearMinus3Amt>76683</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>95467</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>97467</CurrentYearMinus1Amt>
        <CurrentYearAmt>123492</CurrentYearAmt>
        <TotalAmt>393109</TotalAmt>
      </AvgGrassrootsNontaxableGrp>
      <GrassrootsCeilingAmt>589664</GrassrootsCeilingAmt>
    </IRS990ScheduleC>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>UNIVERSITY OF TEXAS MD ANDERSON CANCER CENTER</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1515 HOMCOMBE BLVD</AddressLine1Txt>
          <CityNm>HOUSTON</CityNm>
          <StateAbbreviationCd>TX</StateAbbreviationCd>
          <ZIPCd>77030</ZIPCd>
        </USAddress>
        <RecipientEIN>746001118</RecipientEIN>
        <CashGrantAmt>50000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>NEW INVESTIGATOR AWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>FRED HUTCHINSON CANCER RESEARCH CENTER</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1100 FAIRVIEW AVE</AddressLine1Txt>
          <CityNm>N SEATTLE</CityNm>
          <StateAbbreviationCd>WA</StateAbbreviationCd>
          <ZIPCd>98109</ZIPCd>
        </USAddress>
        <RecipientEIN>911935159</RecipientEIN>
        <CashGrantAmt>100000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>NEW INVESTIGATOR AWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>DANA-FARBER CANCER INSTITUTE</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>450 BROOKLINE AVE</AddressLine1Txt>
          <CityNm>BOSTON</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02215</ZIPCd>
        </USAddress>
        <RecipientEIN>042263040</RecipientEIN>
        <CashGrantAmt>30000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>NEW INVESTIGATOR AWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>GEORGETOWN UNIVERSITY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>37TH AND O STREET NW</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20057</ZIPCd>
        </USAddress>
        <RecipientEIN>530196603</RecipientEIN>
        <CashGrantAmt>50000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>NEW INVESTIGATOR AWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>ST JUDE CHILDREN'S RESEARCH HOSPITAL</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>262 DANNY THOMAS PLACE</AddressLine1Txt>
          <CityNm>MEMPHIS</CityNm>
          <StateAbbreviationCd>TN</StateAbbreviationCd>
          <ZIPCd>38105</ZIPCd>
        </USAddress>
        <RecipientEIN>620646012</RecipientEIN>
        <CashGrantAmt>50000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>NEW INVESTIGATOR AWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>TRUSTEES OF THE UNIVERSITY OF PENNSYLVANIA</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>807 BRB II/II</AddressLine1Txt>
          <CityNm>PHILADELPHIA</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19104</ZIPCd>
        </USAddress>
        <RecipientEIN>231352685</RecipientEIN>
        <CashGrantAmt>50000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>NEW INVESTIGATOR AWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <Total501c3OrgCnt>6</Total501c3OrgCnt>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>EDITORIAL AWARD</GrantTypeTxt>
        <RecipientCnt>3</RecipientCnt>
        <CashGrantAmt>15000</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>TRAVEL GRANTS</GrantTypeTxt>
        <RecipientCnt>33</RecipientCnt>
        <CashGrantAmt>49500</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>LIFETIME ACHIEVEMENT AWARD</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>1000</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>INTERNATIONAL TRAVEL SCHOLARSHIP</GrantTypeTxt>
        <RecipientCnt>2</RecipientCnt>
        <CashGrantAmt>5926</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>PUBLIC SERVICE AWARD</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>824</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION ISSUES AWARDS FOR OUTSTANDING ACHIEVEMENTS IN THE HEMATOPOIETIC STEM CELL TRANSPLANT AND CELLULAR THERAPY FIELDS. APPLICANTS MUST DOWNLOAD AND SUBMIT A COMPLETED APPLICATION ONLINE TO BE CONSIDERED FOR AN AWARD. THE APPLICATIONS ARE REVIEWED BY A REVIEW COMMITTEE AND THE APPLICANTS ARE NOTIFIED OF THEIR AWARD STATUS BY DECEMBER 1. THE AWARD WINNERS ARE PUBLICLY ANNOUNCED AT THE FOLLOWING YEAR TANDEM MEETING EVENT. NO MONITORING OF THE USE OF FUNDS IS CONSIDERED NECESSARY.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <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. THE ORGANIZATION PAID $300,000 IN 2022 FOR THE SERVICES OF THE EXECUTIVE DIRECTOR, WHOM IS EMPLOYED BY THE SMITHBUCKLIN CORPORATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>ASTCT HAS THE FOLLOWING CLASSES OF MEMBERSHIP: MEMBER, ASSOCIATE MEMBER, INTRAINING 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 OR 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 FOR INITIAL REVIEW. THE FORM IS THEN SUBMITTED TO ASTCT'S TREASURER AND EXECUTIVE COMMITTEE FOR REVIEW AND DISCUSSION 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 ORGANIZATION MAKES ITS GOVERNING DOCUMENTS AND CONFLICT OF INTEREST POLICY AVAILABLE TO THE PUBLIC UPON WRITTEN REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>CONSULTING FEES: PROGRAM SERVICE EXPENSES 491,381. MANAGEMENT AND GENERAL EXPENSES 36,230. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 527,611. EDITORIAL SERVICES: PROGRAM SERVICE EXPENSES 266,429. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 266,429. EVENT SERVICES: PROGRAM SERVICE EXPENSES 330,561. MANAGEMENT AND GENERAL EXPENSES 8,822. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 339,383.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
