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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>BRIAN BETTS MD</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ALAN HANASH MD PHD</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SUNG-YUN PAI MD</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>KIRSTEN WILLIAMS</PersonNm>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>LORI MUFFLY MD</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>NIRALI SHAH MD</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>RYOTARO NAKAMURA MD</PersonNm>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SOPHIE PACZESNEY MD</PersonNm>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CLAUDIO BRUNSTEIN MD</PersonNm>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ANDRE WILLIAMS</PersonNm>
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        <OfficerInd>X</OfficerInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>HEATHER HURLEY</PersonNm>
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        <OfficerInd>X</OfficerInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
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      <IndivRcvdGreaterThan100KCnt>0</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>0</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>SMITHBUCKLIN CORPORATION</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>330 N WABASH AVENUE SUITE 2000</AddressLine1Txt>
            <CityNm>CHICAGO</CityNm>
            <StateAbbreviationCd>IL</StateAbbreviationCd>
            <ZIPCd>60611</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>MANAGEMENT SERVICES</ServicesDesc>
        <CompensationAmt>3667256</CompensationAmt>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>FMP MEDIA SOLUTIONS INC</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>3600 HORIZON DRIVE SUITE 180</AddressLine1Txt>
            <CityNm>KING OF PRUSSIA</CityNm>
            <StateAbbreviationCd>PA</StateAbbreviationCd>
            <ZIPCd>19406</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>AV FOR TANDEM</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>BUST OUT SOLUTIONS INC</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>514 3RD ST SUITE 105</AddressLine1Txt>
            <CityNm>MINNEAPOLIS</CityNm>
            <StateAbbreviationCd>MN</StateAbbreviationCd>
            <ZIPCd>55401</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>MOBILE APP DEVELOPMENT</ServicesDesc>
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      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>NIMITT CONSULTING INC</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>9631 NORTH SHORE DR</AddressLine1Txt>
            <CityNm>SPICER</CityNm>
            <StateAbbreviationCd>MN</StateAbbreviationCd>
            <ZIPCd>56288</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>GOVERNMENT RELATIONS</ServicesDesc>
        <CompensationAmt>291893</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>FRANCE FOUNDATION</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>10 VISTA DRIVE STE 100</AddressLine1Txt>
            <CityNm>OLD LYME</CityNm>
            <StateAbbreviationCd>CT</StateAbbreviationCd>
            <ZIPCd>06371</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>EDUCATION SERVICES</ServicesDesc>
        <CompensationAmt>227518</CompensationAmt>
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      <CntrctRcvdGreaterThan100KCnt>5</CntrctRcvdGreaterThan100KCnt>
      <AllOtherContributionsAmt>2769640</AllOtherContributionsAmt>
      <TotalContributionsAmt>2769640</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>ANNUAL MEETING</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>2327892</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>2327892</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>INDUSTRY RELATIONS</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>783437</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>783437</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>EDUCATION/CONFERENCES</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>562583</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>562583</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>PUBLICATIONS</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>540453</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>383009</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>157444</UnrelatedBusinessRevenueAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>MEMBERSHIP DUES</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>373670</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>373670</RelatedOrExemptFuncIncomeAmt>
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      <TotalOthProgramServiceRevGrp>
        <TotalRevenueColumnAmt>250763</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>250763</RelatedOrExemptFuncIncomeAmt>
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      <TotalProgramServiceRevenueAmt>4838798</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>287315</TotalRevenueColumnAmt>
        <ExclusionAmt>287315</ExclusionAmt>
      </InvestmentIncomeGrp>
      <RoyaltiesRevenueGrp>
        <TotalRevenueColumnAmt>400429</TotalRevenueColumnAmt>
        <ExclusionAmt>400429</ExclusionAmt>
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      <GrossAmountSalesAssetsGrp>
        <SecuritiesAmt>427398</SecuritiesAmt>
      </GrossAmountSalesAssetsGrp>
      <LessCostOthBasisSalesExpnssGrp>
        <SecuritiesAmt>233062</SecuritiesAmt>
      </LessCostOthBasisSalesExpnssGrp>
      <GainOrLossGrp>
        <SecuritiesAmt>194336</SecuritiesAmt>
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      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>194336</TotalRevenueColumnAmt>
        <ExclusionAmt>194336</ExclusionAmt>
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        <Desc>MISC. INCOME</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>2006</TotalRevenueColumnAmt>
        <ExclusionAmt>2006</ExclusionAmt>
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      <OtherRevenueTotalAmt>2006</OtherRevenueTotalAmt>
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        <ExclusionAmt>884086</ExclusionAmt>
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      <InfoInScheduleOPartIXInd>X</InfoInScheduleOPartIXInd>
      <GrantsToDomesticOrgsGrp>
        <TotalAmt>747500</TotalAmt>
        <ProgramServicesAmt>747500</ProgramServicesAmt>
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      <GrantsToDomesticIndividualsGrp>
        <TotalAmt>5444</TotalAmt>
        <ProgramServicesAmt>5444</ProgramServicesAmt>
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      <ForeignGrantsGrp>
        <TotalAmt>72580</TotalAmt>
        <ProgramServicesAmt>72580</ProgramServicesAmt>
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      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>36750</TotalAmt>
        <ProgramServicesAmt>36750</ProgramServicesAmt>
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        <TotalAmt>3319897</TotalAmt>
        <ProgramServicesAmt>3033843</ProgramServicesAmt>
        <ManagementAndGeneralAmt>286054</ManagementAndGeneralAmt>
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      <FeesForServicesLegalGrp>
        <TotalAmt>19286</TotalAmt>
        <ManagementAndGeneralAmt>19286</ManagementAndGeneralAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>47000</TotalAmt>
        <ManagementAndGeneralAmt>47000</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForSrvcInvstMgmntFeesGrp>
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        <ManagementAndGeneralAmt>30000</ManagementAndGeneralAmt>
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      <FeesForServicesOtherGrp>
        <TotalAmt>937260</TotalAmt>
        <ProgramServicesAmt>937260</ProgramServicesAmt>
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      <AdvertisingGrp>
        <TotalAmt>60009</TotalAmt>
        <ProgramServicesAmt>17168</ProgramServicesAmt>
        <ManagementAndGeneralAmt>42841</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>120244</ProgramServicesAmt>
        <ManagementAndGeneralAmt>70984</ManagementAndGeneralAmt>
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      <InformationTechnologyGrp>
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        <ProgramServicesAmt>494714</ProgramServicesAmt>
        <ManagementAndGeneralAmt>7116</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>340482</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4492</ManagementAndGeneralAmt>
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      <ConferencesMeetingsGrp>
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        <ProgramServicesAmt>1752617</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1668</ManagementAndGeneralAmt>
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      <DepreciationDepletionGrp>
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        <ProgramServicesAmt>5000</ProgramServicesAmt>
        <ManagementAndGeneralAmt>13000</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>18793</ProgramServicesAmt>
        <ManagementAndGeneralAmt>20367</ManagementAndGeneralAmt>
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        <Desc>TAXES</Desc>
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        <ManagementAndGeneralAmt>3319</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
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        <ProgramServicesAmt>319680</ProgramServicesAmt>
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        <ProgramServicesAmt>34364</ProgramServicesAmt>
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        <ProgramServicesAmt>20206</ProgramServicesAmt>
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      <AllOtherExpensesGrp>
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        <EOYAmt>1954766</EOYAmt>
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        <EOYAmt>735468</EOYAmt>
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        <EOYAmt>201942</EOYAmt>
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        <EOYAmt>4777473</EOYAmt>
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        <EOYAmt>155000</EOYAmt>
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        <EOYAmt>9155930</EOYAmt>
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        <CurrentTaxYearMinus2YearsAmt>975514</CurrentTaxYearMinus2YearsAmt>
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        <CurrentTaxYearMinus2YearsAmt>6967230</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>7797628</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>7608438</CurrentTaxYearAmt>
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        <PurposeOfGrantTxt>NEW INVESTIGATOR AWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <Total501c3OrgCnt>9</Total501c3OrgCnt>
      <TotalOtherOrgCnt>1</TotalOtherOrgCnt>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>TRAVEL GRANTS</GrantTypeTxt>
        <RecipientCnt>4</RecipientCnt>
        <CashGrantAmt>3000</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>PUBLIC SERVICE AWARD DONATIONS AND TRAVEL</GrantTypeTxt>
        <RecipientCnt>3</RecipientCnt>
        <CashGrantAmt>2444</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 $345,000 IN 2023 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>PROFESSIONAL SERVICES: PROGRAM SERVICE EXPENSES 857,260. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 857,260. EDITORIAL SERVICES: PROGRAM SERVICE EXPENSES 80,000. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 80,000.</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>