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        <Desc>MISCELLANEOUS</Desc>
        <TotalAmt>3518</TotalAmt>
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      <TotalFunctionalExpensesGrp>
        <TotalAmt>2137431</TotalAmt>
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      <CashNonInterestBearingGrp>
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        <EOYAmt>248020</EOYAmt>
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        <EOYAmt>330392</EOYAmt>
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      <PledgesAndGrantsReceivableGrp>
        <BOYAmt>400000</BOYAmt>
        <EOYAmt>455856</EOYAmt>
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        <EOYAmt>112985</EOYAmt>
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        <EOYAmt>1185493</EOYAmt>
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      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>24045</BOYAmt>
        <EOYAmt>34975</EOYAmt>
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      <GrantsPayableGrp>
        <BOYAmt>200000</BOYAmt>
        <EOYAmt>539000</EOYAmt>
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      <DeferredRevenueGrp>
        <BOYAmt>53133</BOYAmt>
        <EOYAmt>12680</EOYAmt>
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      <TotalLiabilitiesGrp>
        <BOYAmt>277178</BOYAmt>
        <EOYAmt>586655</EOYAmt>
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      <OrganizationFollowsSFAS117Ind>X</OrganizationFollowsSFAS117Ind>
      <UnrestrictedNetAssetsGrp>
        <BOYAmt>418782</BOYAmt>
        <EOYAmt>518328</EOYAmt>
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      <PermanentlyRstrNetAssetsGrp>
        <BOYAmt>479736</BOYAmt>
        <EOYAmt>80510</EOYAmt>
      </PermanentlyRstrNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>898518</BOYAmt>
        <EOYAmt>598838</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>1175696</BOYAmt>
        <EOYAmt>1185493</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>-299680</ReconcilationRevenueExpnssAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
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    <IRS990ScheduleB documentId="RetDoc1234500001">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <TotalBookValueLandBuildingsAmt>0</TotalBookValueLandBuildingsAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>1837751</TotalRevEtcAuditedFinclStmtAmt>
      <RevenueNotReportedAmt>0</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>1837751</RevenueSubtotalAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>1837751</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>2137431</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>2137431</ExpensesSubtotalAmt>
      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>2137431</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>SIO BELIEVES THAT IT HAS APPROPRIATE SUPPORT FOR ANY TAX POSITIONS TAKEN, AND AS SUCH, DOES NOT HAVE ANY UNCERTAIN TAX POSITIONS THAT ARE MATERIAL TO THE FINANCIAL STATEMENTS OR THAT WOULD HAVE AN EFFECT ON ITS TAX-EXEMPT STATUS. THERE ARE NO UNRECOGNIZED TAX BENEFITS OR LIABILITIES THAT NEED TO BE RECORDED.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>UNIVERSITY OF TEXAS HEALTH SCIENCE CENTER</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>PO BOX 4266</AddressLine1Txt>
          <CityNm>HOUSTON</CityNm>
          <StateAbbreviationCd>TX</StateAbbreviationCd>
          <ZIPCd>772104266</ZIPCd>
        </USAddress>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>185000</CashGrantAmt>
        <PurposeOfGrantTxt>IDENTIFY PROTEOMIC BIOMARKERS FOR OUTCOME PREDICTION OF LIPIODOL TACE TREATMENT AND FOR STRATEGIES TO MODULATE LIVER TUMOR IMMUNE MICROENVIRONMENT AFTER CATHETER-BASED DRUG DELIVERY.</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>MEMORIAL SLOAN KETTERING CANCER CENTER</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1275 YORK AVE</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10065</ZIPCd>
        </USAddress>
        <RecipientEIN>131924236</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>100000</CashGrantAmt>
        <PurposeOfGrantTxt>T-CELL CLONALITY AND CANCER NEOANTIGEN PRESENTATION FOLLOWING INTERVENTIONAL ONCOLOGY THERAPIES</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>UNIVERSITY OF PENNSYLVANIA</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>110 MARYLAND AVE NE 509</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20002</ZIPCd>
        </USAddress>
        <RecipientEIN>231352685</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>200000</CashGrantAmt>
        <PurposeOfGrantTxt>TARGETING THE METABOLIC STRESS RESPONSE IN HEPATOCELLULAR CARCINOMA AND CHARACTERIZATION OF THE IMMUNOBIOLOGIC RESPONSE FOLLOWING TRANSARTERIAL CHEMOEMBOLIZATION OF HCC.</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>OCHSNER CLINIC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>PO BOX 54965</AddressLine1Txt>
          <CityNm>NEW ORLEANS</CityNm>
          <StateAbbreviationCd>LA</StateAbbreviationCd>
          <ZIPCd>701544965</ZIPCd>
        </USAddress>
        <RecipientEIN>720502505</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>89000</CashGrantAmt>
        <PurposeOfGrantTxt>TUMOR-INDUCED TOLERANCE DRIVING EMBOLIZATION RESISTANCE AND WAITLIST FOR TRANSPLANT OUTCOMES.</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>REGENTS OF THE UNIVERSITY OF CALIFORNIA-SAN DIEGO</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>9500 GILLMAN DR</AddressLine1Txt>
          <CityNm>LA JOLLA</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>920930009</ZIPCd>
        </USAddress>
        <RecipientEIN>956006144</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>80000</CashGrantAmt>
        <PurposeOfGrantTxt>EFFECTS OF CYROABLATION ON HEPATOCELLULAR CARCINOMA CANCER STEM CELLS AND THE IMMUNE RESPONSE.</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>NORTHWESTERN UNIVERSITY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>750 N LAKESHORE DR</AddressLine1Txt>
          <CityNm>CHICAGO</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>606114579</ZIPCd>
        </USAddress>
        <RecipientEIN>362167817</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>64000</CashGrantAmt>
        <PurposeOfGrantTxt>Y90 RADIOEMBOLIZATION COMBINED WITH IMMUNE CHECKPOINT BLOCKADE IN AN ANIMAL MODEL OF HEPATOCELLULAR.</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>YALE UNIVERSITY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>PO BOX 1873</AddressLine1Txt>
          <CityNm>NEW HAVEN</CityNm>
          <StateAbbreviationCd>CT</StateAbbreviationCd>
          <ZIPCd>065081873</ZIPCd>
        </USAddress>
        <RecipientEIN>060646973</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>100000</CashGrantAmt>
        <PurposeOfGrantTxt>MOLECULAR IMAGING OF THE TUMOR MICROENVIRONMENT AND IMMUNE RESPONSE IN TACE.</PurposeOfGrantTxt>
      </RecipientTable>
      <Total501c3OrgCnt>7</Total501c3OrgCnt>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>TRAVEL SCHOLARSHIPS TO THE WCIO CONFERENCE</GrantTypeTxt>
        <RecipientCnt>48</RecipientCnt>
        <CashGrantAmt>40500</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>SIO AND THE WCIO CONFERENCE INVESTS IN THE SUCCESS OF THE INTERVENTIONAL ONCOLOGY (IO) FIELD BY OFFERING FUTURE IO PROFESSIONALS THE OPPORTUNITY TO ATTEND AND ENGAGE IN WCIO ANNUAL CONFERENCES THROUGH THE WCIO ANNUAL MEETING SCHOLARSHIP. THE SCHOLARSHIP IS OPEN TO ALL INTERVENTIONAL RADIOLOGY FELLOWS, DIAGNOSTIC RADIOLOGY RESIDENTS AND POST-GRADUATE MEDICAL STUDENTS WITHIN THE UNITED STATES. AN APPLICANT MUST BE IN THEIR ACGME INTERVENTIONAL RADIOLOGY FELLOWSHIP OR ACGME DIAGNOSTIC RADIOLOGY RESIDENCY AT THE TIME OF APPLICATION, OR BE A POST-GRADUATE MEDICAL STUDENT WITHIN THE IO FIELD. MINIMAL MONITORING IS REQUIRED. GRANT MONITORING: AN INTERIM PROGRESS REPORT IS REQUIRED AFTER THE FIRST SIX MONTHS OF THE PROJECT AND A FINAL REPORT NO LATER THAN 12 MONTHS AFTER THE AWARD IS SCHEDULED TO CONCLUDE.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 1</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE COMMITTEE SHALL BE COMPRISED OF THE ELECTED OFFICERS OF THE ORGANIZATION, THE CHAIR, VICE-CHAIR AND PAST-CHAIR. THE COMMITTEE SHALL MEET REGULARLY AS OUTLINED IN THE BOARD POLICY. THE EXECUTIVE COMMITTEE SHALL ACT FOR THE BOARD OF DIRECTORS IN THE INTERIM BETWEEN MEETINGS OF THE BOARD BY A TWO-THIRDS VOTE. ALL DIRECTORS SHALL BE SENT ELECTRONIC NOTICE OF AN EXECUTIVE COMMITTEE VOTE WITHIN FIVE (5) BUSINESS DAYS OF SUCH VOTE, ALONG WITH THE OPPORTUNITY TO NOTIFY THE CHIEF EXECUTIVE OFFICER ELECTRONICALLY WITHIN A DATE SPECIFIED IN SUCH NOTICE (SAID DATE NOT TO BE LESS THAN FIVE (5) BUSINESS DAYS AFTER THE DATE OF SUCH NOTICE) IF THEY WISH THE EXECUTIVE COMMITTEE VOTE TO BE SUBJECT TO RATIFICATION BY THE BOARD OF DIRECTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS ENTERED INTO A MANAGEMENT CONTRACT WITH SMITHBUCKLIN CORPORATION. UNDER THE TERMS OF THIS CONTRACT, SIO MAKES PAYMENTS TO SMITHBUCKLIN WHICH COVER STAFF SALARIES AND OTHER OVERHEAD EXPENSES. SMITHBUCKLIN'S PERFORMANCE UNDER THIS AGREEMENT IS MONITORED BY THE BOARD OF SIO. THE FEES INCURRED BY SIO DURING THE YEAR ENDED DECEMBER 31, 2018 WERE $502,982 WHICH WERE BROKEN DOWN AS FOLLOWS: EXECUTIVE MANAGEMENT $60,000, MEMBERSHIP AND OPERATIONS SERVICES - $126,141, FINANCIAL MANAGEMENT AND ACCOUNTING SERVICES - $15,000, EVENT SERVICES - $69,775, MARKETING AND COMMUNICATION SERVICES - $86,565; CREATIVE AND DESIGN SERVICES - $19,773, EDUCATION AND LEARNING SERVICES - $73,284; INFORMATION TECHNOLOGY SERVICES - $22,165; VALUE-ADDED SERVICES - $30,279.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S MEMBERS ELECT THE MEMBERS OF THE BOARD OF DIRECTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS REVIEWED BY THE STAFF OF THE MANAGEMENT COMPANY, INCLUDING THE EXECUTIVE DIRECTOR, AND A COPY IS PROVIDED TO THE ENTIRE BOARD PRIOR TO FILING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAKES ITS GOVERNING DOCUMENTS AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS NOT CHANGED ITS OVERSIGHT PROCESS OR SELECTION PROCESS OF AN INDEPENDENT ACCOUNTANT DURING THE TAX YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>