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          <BusinessName>
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          <USAddress>
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          <BusinessName>
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      <OtherExpensesGrp>
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          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
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    </IRS990ScheduleB>
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        <FilingOrganizationsTotalAmt>276959</FilingOrganizationsTotalAmt>
      </TotalDirectLobbyingGrp>
      <TotalLobbyingExpendGrp>
        <FilingOrganizationsTotalAmt>276959</FilingOrganizationsTotalAmt>
      </TotalLobbyingExpendGrp>
      <OtherExemptPurposeExpendGrp>
        <FilingOrganizationsTotalAmt>10123463</FilingOrganizationsTotalAmt>
      </OtherExemptPurposeExpendGrp>
      <TotalExemptPurposeExpendGrp>
        <FilingOrganizationsTotalAmt>10400422</FilingOrganizationsTotalAmt>
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      <LobbyingNontaxableAmountGrp>
        <FilingOrganizationsTotalAmt>670021</FilingOrganizationsTotalAmt>
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      <GrassrootsNontaxableGrp>
        <FilingOrganizationsTotalAmt>167505</FilingOrganizationsTotalAmt>
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        <FilingOrganizationsTotalAmt>0</FilingOrganizationsTotalAmt>
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        <CurrentYearMinus1Amt>597421</CurrentYearMinus1Amt>
        <CurrentYearAmt>670021</CurrentYearAmt>
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        <CurrentYearAmt>167505</CurrentYearAmt>
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        <FormAndLineReferenceDesc>PART II-A, LINE 1</FormAndLineReferenceDesc>
        <ExplanationTxt>NATIONAL BRAIN TUMOR SOCIETY ENGAGES IN A MODEST AMOUNT OF IRS DEFINITION DIRECT LOBBYING TO INFLUENCE SPECIFIC FEDERAL LEGISLATION ON AN ANNUAL BASIS. THE FEDERAL LEGISLATION SPANS THE HEALTH CARE AND LIFE SCIENCES RESEARCH POLICY ISSUES THAT MAKE UP NBTS' POLICY AGENDA. THE LOBBYING WORK IS CARRIED OUT BY NBTS PROFESSIONAL STAFF AND CONSULTANTS. NBTS DOES NOT ENGAGE IN IRS DEFINITION INDIRECT LOBBYING.</ExplanationTxt>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <RevenueNotReportedFinclStmtAmt>2040</RevenueNotReportedFinclStmtAmt>
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        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS ENDOWMENT NET ASSETS IN WHICH THE PRINCIPAL AND ANY CURRENT CONTRIBUTIONS ARE PERMANENTLY DONOR RESTRICTED. THE BALANCE AS OF DECEMBER 31, 2022 WAS INVESTED IN BOND FUNDS AND MONEY MARKETS. INCOME AND APPRECIATION EARNED ON THE PERMANENTLY RESTRICTED NET ASSETS ARE RESTRICTED TO SUPPORT THE COSTS OF PRODUCING AND DISTRIBUTING THE ESSENTIAL GUIDE TO BRAIN TUMORS AND TO FUND RESEARCH PROJECTS. THE INFORMATION IS UPDATED ON AN ANNUAL BASIS AND MADE AVAILABLE THROUGH THE ORGANIZATION'S WEBSITE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION ACCOUNTS FOR UNCERTAINTY IN INCOME TAXES IN ACCORDANCE WITH ASC TOPIC, INCOME TAXES. THIS STANDARD CLARIFIES THE ACCOUNTING FOR UNCERTAINTY IN TAX POSITIONS AND PRESCRIBES A RECOGNITION THRESHOLD AND MEASUREMENT ATTRIBUTE FOR THE CONSOLIDATED FINANCIAL STATEMENTS REGARDING A TAX POSITION TAKEN OR EXPECTED TO BE TAKEN IN A TAX RETURN. THE ORGANIZATION HAS DETERMINED THAT THERE ARE NO UNCERTAIN TAX POSITIONS WHICH QUALIFY FOR EITHER RECOGNITION OR DISCLOSURE IN THE CONSOLIDATED FINANCIAL STATEMENTS AT DECEMBER 31, 2022.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
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