Liabilities / Assets
61st percentile
Higher debt load relative to assets than 61% of similar nonprofits.
Innovations in Cancer Therapy
EIN 41-2161648 • 501(c)6 • Washington, DC
Profile
To establish,nurture and support interventional oncology as the fourth pillar of cancer therapy.
Siviq Scores
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
0.32x
Liabilities / Revenue
84th percentile
Higher debt load relative to revenue than 84% of similar nonprofits.
Net Margin
8th percentile
Higher net margin than 8% of similar nonprofits.
Top Officer Pay
Score unavailable
No filing with officer rows is available for this organization yet.
Asset Growth
26th percentile
Faster asset growth than 26% of similar nonprofits.
Revenue Growth
27th percentile
Faster revenue growth than 27% of similar nonprofits.
Balance Sheet
Assets
Up$10,052,218
Up $1,233 (+0.0%) from 2023
Liabilities
Up$3,198,603
Up $634,327 (+25%) from 2023
Net Assets
Down$6,853,615
Down $633,094 (-8.5%) from 2023
Revenue
Up$3,751,897
Up $11,510 (+0.3%) from 2023
Expenses
Up$4,384,991
Up $1,495,918 (+52%) from 2023
Net Income
Down-$633,094
Down $1,484,408 (-174%) from 2023
Trend Graphs
Filings
Most recent year
2024 • Form 990Facts available. Structured filing facts are available, but richer extracted sections are limited.
- Assets
- $10,052,218
- Liabilities
- $3,198,603
- Net assets
- $6,853,615
- Revenue
- $3,751,897
- Expenses
- $4,384,991
- Net income
- -$633,094
Latest Filing Detail
Jump To
Filing Snapshot
- Filing Period
- Jan 1, 2024 to Dec 31, 2024
- Signed
- Aug 28, 2025
- Return Version
- 2024v5.2
- Gross Receipts
- $9,121,629
Mission and Program Overview
Mission
To advance interventional oncology as the fourth pillar of cancer therapy alongside medical, surgical, and radiation oncology worldwide.
To advance interventional oncology by developing evidence supporting io therapies, educating io practitioners, and improving patient access to io therapies.
Balance Sheet Detail
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Investments in Publicly Traded Securities | $4,947,518 | $6,702,182 | ▲ $1,754,664 |
| Cash and Non-Interest-Bearing Accounts | $1,859,929 | $2,366,521 | ▲ $506,592 |
| Prepaid Expenses and Deferred Charges | $339,193 | $488,378 | ▲ $149,185 |
| Pledges and Grants Receivable | $500,000 | $250,000 | ▼ $250,000 |
| Accounts Receivable | $72,000 | $132,500 | ▲ $60,500 |
| Savings and Temporary Cash Investments | $2,332,345 | $112,637 | ▼ $2,219,708 |
| Total Assets | $10,050,985 | $10,052,218 | ▲ $1,233 |
| Liabilities | |||
| Deferred Revenue | $2,352,473 | $2,841,532 | ▲ $489,059 |
| Accounts Payable and Accrued Expenses | $116,903 | $272,171 | ▲ $155,268 |
| Grants Payable | $94,900 | $84,900 | ▼ $10,000 |
| Total Liabilities | $2,564,276 | $3,198,603 | ▲ $634,327 |
| Net Assets / Fund Balance | |||
| Net Assets With Donor Restrictions | $5,982,243 | $4,764,396 | ▼ $1,217,847 |
| Net Assets Without Donor Restrictions | $1,504,466 | $2,089,219 | ▲ $584,753 |
| Total Net Assets Fund Balance | $7,486,709 | $6,853,615 | ▼ $633,094 |
| Total Liabilities and Net Assets / Fund Balance | $10,050,985 | $10,052,218 | ▲ $1,233 |
Compensation and Service Providers
Employees
| Name | Title | Base | Total |
|---|---|---|---|
| Terence Gade | Board Member as of January | $7,750 | $7,750 |
| Edward Kim | Board Member | $7,000 | $7,000 |
| Jack Jennings | Treasurer | $1,000 | $1,000 |
Board Members and Trustees
| Name | Title |
|---|---|
| Matthew Callstrom | Immediate Past President |
| Muneeb Ahmed | President |
| Alexis Kelekis | President Elect |
| David Breen | Board Member |
| Franco Orsi | Board Member |
| Ron Arellano | Board Member |
| Sarah White | Board Member |
| Uei Pua | Board Member Until January |
| Jena Eberly Stack | Executive Director |
Highest Paid Contractors
| Contractor | Services | Location | Compensation |
|---|---|---|---|
| Smithbucklin Corporation | Management (incl. Ed Comp.) | 330 N WABASH AVE, Chicago, IL 60611 | $1,414,393 |
| Technical Resources International INC | Clinical Trials | 6500 ROCK SPRING DR STE 650, Bethesda, MD 20817 | $596,998 |
| Smg Food & Beverage LLC | F&b Services | 300 E OCEAN BLVD, Long Beach, CA 90802 | $279,448 |
| Ccr Solutions INC | Av Services | 4351 35TH ST, Orlando, FL 32811 | $195,000 |
| Freeman | Conference Decorator | PO BOX 734596, Dallas, TX 75373 | $148,546 |
Revenue and Support
Revenue Composition
- Contributions and Grants
- $237,000
- Program Service Revenue
- $3,124,931
- Investment Income
- $371,526
- Other Revenue
- $18,440
- All Other Contributions
- $237,000
- Change in Net Assets
- $-633,094
Audited Revenue Reconciliation
- Revenue per Audited Statements
- $3,676,272
- Revenue Not Reported on Financial Statements
- $75,625
- Revenue Not Reported on Form 990
- $0
- Total Revenue per Audited Statements
- $3,676,272
- Total Revenue per Form 990
- $3,751,897
Expenses and Functional Allocation
Major Expense Lines
| Line Item | Amount |
|---|---|
| Other Expenses | $4,088,159 |
| Grants and Similar Amounts Paid | $281,082 |
| Salaries, Compensation, and Employee Benefits | $15,750 |
| Professional Fundraising Fees | $0 |
| Total Fundraising Expense | $0 |
Functional Expense Allocation
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Fees for Services Management | - | - | - | $1,393,958 |
| Fees for Services Other | - | - | - | $1,050,073 |
| Conferences and Meetings | - | - | - | $954,168 |
| Grants to Domestic Individuals | - | - | - | $281,082 |
| Travel | - | - | - | $267,670 |
| Fees for Service Investment Mgmnt Fees | - | - | - | $75,625 |
| Office Expenses | - | - | - | $53,989 |
| Insurance | - | - | - | $41,787 |
| Current Officers, Directors, Trustees, and Key Employees | - | - | - | $15,750 |
| Other Expenses | - | - | - | $15,000 |
| Fees for Services Accounting | - | - | - | $14,200 |
| Fees for Services Legal | - | - | - | $10,116 |
| Advertising | - | - | - | $6,190 |
| Information Technology | - | - | - | $4,936 |
| Total Functional Expenses | $0 | $0 | $0 | $4,384,991 |
Audited Expense Reconciliation
| Line Item | Amount |
|---|---|
| Total Expenses per Form 990 | $4,384,991 |
| Expenses per Audited Statements | $4,309,366 |
| Total Expenses per Audited Statements | $4,309,366 |
| Expenses Not Reported on Financial Statements | $75,625 |
| Expenses Not Reported on Form 990 | $0 |
Fundraising, Events, and Gaming
- Fundraising activities
- No
- Gaming activities
- No
- Professional fundraiser used
- No
Fundraising and Gaming Totals
| Line Item | Amount |
|---|---|
| Professional Fundraising Fees | $0 |
Political and Lobbying Activity
- Political campaign activity
- No
- In-house lobbying only
- Yes
- Subject to proxy tax
- Yes
Governance and Compliance
Governance Checklist
- Compiled or reviewed by an accountant
- No
- Annual disclosure for covered persons
- No
- Audit committee
- Yes
- Backup withholding compliance
- Yes
- Business relationship with 35% controlled entity
- No
- Business relationship with family members
- No
- Business relationship with organization members
- No
- Material changes to governing documents
- No
- Compensation from other sources disclosed
- No
- CEO compensation reviewed
- No
- Other officer compensation reviewed
- No
- Conflict-of-interest policy
- Yes
- Audited financial statements prepared
- No
- Key decisions subject to board approval
- No
- Management duties delegated
- Yes
Governance Explanations
Form 990, Part VI, Section A, Line 3
“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. The fees incurred by sio during the year ended december 31, 2024 were $1,393,958 for the following: executive management of $235,000, membership and operations services, event services, registration services, tradeshow services, marketing and communications services, creative and design services, financial management and accounting services, information technology services, fullfilment services, site selection and contracting, content services, ams platform and support, and promotional products and support. Smithbucklin's performance under this agreement is monitored by the board of sio.”
Form 990, Part VI, Section A, Line 6
“The membership of the society shall consist of: active - dues paying individuals who are physicians who practice interventional oncology or a related field and phd level scientists. Active members are voting members who can hold office or serve as committee chairs. Affiliate - dues paying individuals who are not physicians, but are related medical professionals, research assistants, or health specialists who support activities related to interventional oncology. Affiliate members cannot vote or hold office, but can serve on a committee. Resident/fellow - dues paying individuals in their residency or fellowship. Residents and fellows cannot vote, serve on a committee, or hold office. Student - dues paying individuals who are students of interventional oncology or related field. Students cannot vote, serve on a committee, or hold office.”
Form 990, Part VI, Section A, Line 7A
“The organization's members elect the members of the board of directors.”
Form 990, Part VI, Section B, Line 11B
“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.”
Form 990, Part VI, Section C, Line 19
“The organization makes its governing documents and financial statements available to the public upon request.”
Filing and Contact Details
Filer
- Filer Name
- Society of Interventional Oncology Inc
- EIN
- 41-2161648
- Phone
- 2023671164
- Address
- 2001 K STREET NW 300, WASHINGTON, DC 20006
Signing Officer
- Name
- Jena Eberly Stack
- Title
- Executive Director
- Phone
- 2023671164
- Signed
- 2025-08-28
- Discuss with paid preparer
- Yes
Organization Details
- Principal Officer
- Jena Eberly Stack
- Formed
- 2005
- Legal Domicile
- Ma
- Voting Board Members
- 10
- Independent Board Members
- 10
- Employees
- 0
- Volunteers
- 11
Preparer
- Firm
- Jm&m
- Address
- 10500 LITTLE PATUXENT PARKWAY SUITE, 770, COLUMBIA, MD 21044
- Phone
- 4108840220
Supplemental Narrative
Additional Explanations
Form 990, Part IX, Line 11G
“Speaker fee 198,749. Other professional fees 851,324.”
FORM 990, PART XII, LINE 2C:
“The organization has not changed its oversight process or selection process of an independent accountant during the tax year.”
Financial Statement Notes
PART X, LINE 2:
“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.”
Raw XML AppendixShowing 400 of 451 raw XML fields
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
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| IRS990/ActivityOrMissionDesc | 0 | TO ADVANCE INTERVENTIONAL ONCOLOGY BY DEVELOPING EVIDENCE SUPPORTING IO THERAPIES, EDUCATING IO PRACTITIONERS, AND IMPROVING PATIENT ACCESS TO IO THERAPIES. |
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| IRS990/Desc | 0 | ANNUAL MEETING - SIO HOLDS AN ANNUAL MULTIDISCIPLINARY SCIENTIFIC MEETING, WITH EXHIBITS ON INTERVENTIONAL ONCOLOGY ISSUES. THE MEETING PRESENTS CURRENT INFORMATION ON RESEARCH, NEW PRODUCTS, AND NEW TECHNIQUES IN THE INTERVENTIONAL ONCOLOGY FIELD. |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
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| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | PRESIDENT ELECT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | IMMEDIATE PAST PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | BOARD MEMBER UNTIL JANUARY |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | EXECUTIVE DIRECTOR |
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| IRS990/FormationYr | 0 | 2005 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
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| IRS990/FSAuditedInd | 0 | 1 |
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| IRS990/GamingActivitiesInd | 0 | 0 |
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| IRS990/GrantsPayableGrp/EOYAmt | 0 | 84900 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 281082 |
| IRS990/GrantsToIndividualsInd | 0 | 1 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 5486535 |
| IRS990/GrossReceiptsAmt | 0 | 9121629 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 10 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
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| IRS990/InfoInScheduleOPartIXInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIIInd | 0 | X |
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| IRS990/InsuranceGrp/TotalAmt | 0 | 41787 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 254723 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 254723 |
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| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 6702182 |
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| IRS990/LocalChaptersInd | 0 | 0 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
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| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | TO ADVANCE INTERVENTIONAL ONCOLOGY AS THE FOURTH PILLAR OF CANCER THERAPY ALONGSIDE MEDICAL, SURGICAL, AND RADIATION ONCOLOGY WORLDWIDE. |
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| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
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| IRS990/Organization501cInd | 0 | X |
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| IRS990/OtherExpensesGrp/Desc | 0 | RESEARCH |
| IRS990/OtherExpensesGrp/Desc | 1 | MISCELLANEOUS |
| IRS990/OtherExpensesGrp/Desc | 2 | LICENSES AND FEES |
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| IRS990/OtherExpensesGrp/TotalAmt | 1 | 21476 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 15000 |
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| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 488378 |
| IRS990/PrincipalOfficerNm | 0 | JENA EBERLY STACK |
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| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 2 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 3 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 4 | 900099 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | ANNUAL MEETING |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | OTHER MEETINGS |
| IRS990/ProgramServiceRevenueGrp/Desc | 2 | MEMBERSHIP DUES |
| IRS990/ProgramServiceRevenueGrp/Desc | 3 | ONLINE LEARNING |
| IRS990/ProgramServiceRevenueGrp/Desc | 4 | CLINICAL TRIALS |
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| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 469425 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 2 | 420311 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 3 | 225500 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 4 | 100000 |
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| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 469425 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 2 | 420311 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 3 | 225500 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 4 | 100000 |
| IRS990/ProgSrvcAccomActy2Grp/Desc | 0 | RESEARCH GRANTS - SIO FUNDS SEVERAL RESEARCH GRANTS SINCE 2017 THAT ARE ONGOING PROJECTS. THESE GRANTS ARE DESIGNED TO FUND RESEARCH EVALUATING AND ADVANCING THE INTERACTIONS BETWEEN TWO PREMIER INTERVENTIONAL ONCOLOGIC THERAPIES AND ADVANCING INTERVENTIONAL ONCOLOGY WORLDWIDE. OTHER GRANTS INCLUDE GRANTS FOR INTERVENTIONAL ONCOLOGY/IMMUNO-ONCOLOGY. |
| IRS990/ProgSrvcAccomActy3Grp/Desc | 0 | OTHER MEETINGS - SIO REGULARLY HOLDS ADDITIONAL MASTER CLASSES UNDER THE IO UNIVERSITY FOR THE PURPOSE OF PROVIDING TRAINING IN INTERVENTIONAL ONCOLOGY RELEVANT TOPICS. |
| IRS990/ProgSrvcAccomActyOtherGrp/Desc | 0 | PUBLICATIONS - SIO PUBLISHES VARIOUS RESOURCES RELATED TO INTERVENTIONAL ONCOLOGY INCLUDING IO PERSPECTIVES, IO INSIGHTS, AND THE INSIDER, A MONTHLY PUBLICATIONS DIGEST. |
| IRS990/ProgSrvcAccomActyOtherGrp/Desc | 1 | ONLINE COMMUNITY - THE SOCIETY OF INTERVENTIONAL ONCOLOGY (SIO) PRESENTS AN INTERVENTIONAL ONCOLOGY (IO) ONLINE COMMUNITY DESIGNED TO ESTABLISH IO CANCER THERAPY AS THE 4TH PILLAR OF CANCER THERAPYALONGSIDE MEDICAL, SURGICAL, AND RADIATION ONCOLOGY WORLDWIDE. |
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| IRS990/PYContributionsGrantsAmt | 0 | 1164900 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 221560 |
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| IRS990/PYOtherExpensesAmt | 0 | 2667513 |
| IRS990/PYOtherRevenueAmt | 0 | 14096 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 2493582 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 851314 |
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| IRS990/PYTotalExpensesAmt | 0 | 2889073 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 3740387 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | -633094 |
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| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 0 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 0 |
| IRS990/ReportOtherAssetsInd | 0 | 0 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 0 |
| IRS990/ReportProgramRelatedInvstInd | 0 | 0 |
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| IRS990/RoyaltiesRevenueGrp/TotalRevenueColumnAmt | 0 | 18440 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 2332345 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 112637 |
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| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine2 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/City | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/State | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/ZIPCode | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/TotalContributionsAmt | 0 | RESTRICTED |
| IRS990/ScheduleBRequiredInd | 0 | 1 |
| IRS990ScheduleC/AgreeCarryoverPriorYearInd | 0 | 0 |
| IRS990ScheduleC/OnlyInHouseLobbyingInd | 0 | 1 |
| IRS990ScheduleC/SubstantiallyAllDuesNondedInd | 0 | 0 |
| IRS990ScheduleD/ExpensesNotReportedAmt | 0 | 0 |
| IRS990ScheduleD/ExpensesNotRptFinclStmtAmt | 0 | 75625 |
| IRS990ScheduleD/ExpensesSubtotalAmt | 0 | 4309366 |
| IRS990ScheduleD/FootnoteTextInd | 0 | X |
| IRS990ScheduleD/InvestmentExpensesNotIncld2Amt | 0 | 75625 |
| IRS990ScheduleD/InvestmentExpensesNotIncldAmt | 0 | 75625 |
| IRS990ScheduleD/RevenueNotReportedAmt | 0 | 0 |
| IRS990ScheduleD/RevenueNotReportedFinclStmtAmt | 0 | 75625 |
| IRS990ScheduleD/RevenueSubtotalAmt | 0 | 3676272 |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 0 | 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. |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | PART X, LINE 2: |
| IRS990ScheduleD/TotalBookValueLandBuildingsAmt | 0 | 0 |
| IRS990ScheduleD/TotalExpensesPerForm990Amt | 0 | 4384991 |
| IRS990ScheduleD/TotalRevenuePerForm990Amt | 0 | 3751897 |
| IRS990ScheduleD/TotalRevEtcAuditedFinclStmtAmt | 0 | 3676272 |
| IRS990ScheduleD/TotExpnsEtcAuditedFinclStmtAmt | 0 | 4309366 |
| IRS990ScheduleI/GrantRecordsMaintainedInd | 0 | 1 |
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| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/GrantTypeTxt | 0 | TRAVEL STIPEND |
| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/RecipientCnt | 0 | 232 |
| IRS990ScheduleI/SupplementalInformationDetail/ExplanationTxt | 0 | ASSISTANCE IS IN THE FORM OF TRAVEL STIPENDS AND FREE REGISTRATION TO THE SIO ANNUAL SCIENTIFIC MEETING, PLUS FUNDING TO SUPPORT THE START OF A RESEARCH PROJECT UNDER THE GUIDANCE OF A MENTOR. MINIMAL MONITORING IS REQUIRED. |
| IRS990ScheduleI/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | PART I, LINE 2: |
| IRS990/ScheduleJRequiredInd | 0 | 0 |
| IRS990/ScheduleORequiredInd | 0 | 1 |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 0 | 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. THE FEES INCURRED BY SIO DURING THE YEAR ENDED DECEMBER 31, 2024 WERE $1,393,958 FOR THE FOLLOWING: EXECUTIVE MANAGEMENT OF $235,000, MEMBERSHIP AND OPERATIONS SERVICES, EVENT SERVICES, REGISTRATION SERVICES, TRADESHOW SERVICES, MARKETING AND COMMUNICATIONS SERVICES, CREATIVE AND DESIGN SERVICES, FINANCIAL MANAGEMENT AND ACCOUNTING SERVICES, INFORMATION TECHNOLOGY SERVICES, FULLFILMENT SERVICES, SITE SELECTION AND CONTRACTING, CONTENT SERVICES, AMS PLATFORM AND SUPPORT, AND PROMOTIONAL PRODUCTS AND SUPPORT. SMITHBUCKLIN'S PERFORMANCE UNDER THIS AGREEMENT IS MONITORED BY THE BOARD OF SIO. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 1 | THE MEMBERSHIP OF THE SOCIETY SHALL CONSIST OF: ACTIVE - DUES PAYING INDIVIDUALS WHO ARE PHYSICIANS WHO PRACTICE INTERVENTIONAL ONCOLOGY OR A RELATED FIELD AND PHD LEVEL SCIENTISTS. ACTIVE MEMBERS ARE VOTING MEMBERS WHO CAN HOLD OFFICE OR SERVE AS COMMITTEE CHAIRS. AFFILIATE - DUES PAYING INDIVIDUALS WHO ARE NOT PHYSICIANS, BUT ARE RELATED MEDICAL PROFESSIONALS, RESEARCH ASSISTANTS, OR HEALTH SPECIALISTS WHO SUPPORT ACTIVITIES RELATED TO INTERVENTIONAL ONCOLOGY. AFFILIATE MEMBERS CANNOT VOTE OR HOLD OFFICE, BUT CAN SERVE ON A COMMITTEE. RESIDENT/FELLOW - DUES PAYING INDIVIDUALS IN THEIR RESIDENCY OR FELLOWSHIP. RESIDENTS AND FELLOWS CANNOT VOTE, SERVE ON A COMMITTEE, OR HOLD OFFICE. STUDENT - DUES PAYING INDIVIDUALS WHO ARE STUDENTS OF INTERVENTIONAL ONCOLOGY OR RELATED FIELD. STUDENTS CANNOT VOTE, SERVE ON A COMMITTEE, OR HOLD OFFICE. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 2 | THE ORGANIZATION'S MEMBERS ELECT THE MEMBERS OF THE BOARD OF DIRECTORS. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 3 | 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. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 4 | THE ORGANIZATION MAKES ITS GOVERNING DOCUMENTS AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 5 | SPEAKER FEE 198,749. OTHER PROFESSIONAL FEES 851,324. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 6 | THE ORGANIZATION HAS NOT CHANGED ITS OVERSIGHT PROCESS OR SELECTION PROCESS OF AN INDEPENDENT ACCOUNTANT DURING THE TAX YEAR. |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | FORM 990, PART VI, SECTION A, LINE 3 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | FORM 990, PART VI, SECTION A, LINE 6 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 2 | FORM 990, PART VI, SECTION A, LINE 7A |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 3 | FORM 990, PART VI, SECTION B, LINE 11B |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 4 | FORM 990, PART VI, SECTION C, LINE 19 |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 5 | FORM 990, PART IX, LINE 11G |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 6 | FORM 990, PART XII, LINE 2C: |
| IRS990/SchoolOperatingInd | 0 | 0 |
| IRS990/SignificantChangeInd | 0 | 0 |
| IRS990/SignificantNewProgramSrvcInd | 0 | 0 |
| IRS990/StatesWhereCopyOfReturnIsFldCd | 0 | DC |
| IRS990/SubjectToExcsTaxNetInvstIncInd | 0 | 0 |
| IRS990/SubjectToProxyTaxInd | 0 | 1 |
| IRS990/SubjToTaxRmnrtnExPrchtPymtInd | 0 | 0 |
| IRS990/TaxablePartyNotificationInd | 0 | 0 |
| IRS990/TaxExemptBondsInd | 0 | 0 |
| IRS990/TerminateOperationsInd | 0 | 0 |
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| IRS990/TotalAssetsEOYAmt | 0 | 10052218 |
| IRS990/TotalAssetsGrp/BOYAmt | 0 | 10050985 |
| IRS990/TotalAssetsGrp/EOYAmt | 0 | 10052218 |
| IRS990/TotalCompGreaterThan150KInd | 0 | 0 |
| IRS990/TotalContributionsAmt | 0 | 237000 |
| IRS990/TotalEmployeeCnt | 0 | 0 |
| IRS990/TotalFunctionalExpensesGrp/TotalAmt | 0 | 4384991 |
| IRS990/TotalGrossUBIAmt | 0 | 0 |
| IRS990/TotalLiabilitiesBOYAmt | 0 | 2564276 |
| IRS990/TotalLiabilitiesEOYAmt | 0 | 3198603 |
| IRS990/TotalLiabilitiesGrp/BOYAmt | 0 | 2564276 |
| IRS990/TotalLiabilitiesGrp/EOYAmt | 0 | 3198603 |
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| IRS990/TotalNetAssetsFundBalanceGrp/EOYAmt | 0 | 6853615 |
| IRS990/TotalOtherCompensationAmt | 0 | 0 |
| IRS990/TotalOthProgramServiceRevGrp/RelatedOrExemptFuncIncomeAmt | 0 | 51470 |
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